CN115952975A - A charging pile group power control method, system, device and medium - Google Patents

Abstract

The present invention provides a method, system, device and medium for controlling the power of a charging pile group, including: based on the interaction parameters between each charging pile and the construction equipment management system, using a pre-established priority algorithm to determine the priority of each charging pile; The parameters of the interaction between each charging pile and the building equipment management system are used to calculate the total power of the charging pile group and the remaining available power of the charging pile group; when the total power of the charging pile group enters the preset power adjustment buffer, based on each charging pile The priority of the charging piles is combined with the remaining available power of the charging piles to regulate the output power of each charging pile; the present invention uses a priority-based regulation algorithm combined with a power regulation strategy to solve the problem that the power distribution capacity of the existing charging piles is less than the rated power of all charging piles The sum of the total, which affects the safe operation of the charging station, realizes the regulation and control that the sum of the actual charging power of all charging piles is less than the actual distribution capacity of the configuration, ensuring the safe operation of the charging station.

Description

A charging pile group power control method, system, device and medium

technical field

The invention relates to the field of distribution station engineering construction, in particular to a charging pile group power control method, system, equipment and medium.

Background technique

With the continuous and rapid growth of the number of electric vehicles, the number of public charging piles is also increasing steadily, but the speed of construction of charging piles is still far behind the growth rate of the number of electric vehicles.

Due to its special geographical location, DC fast charging piles located in urban business districts need to meet the needs of users for centralized charging and fast charging. When charging station operators invest in the construction of charging stations, they generally make full use of parking spaces and install as many charging piles as possible. The capacity is actually less than the sum of the rated power of all charging piles, which affects the safe operation of charging stations. Therefore, how to ensure that the total charging power of charging piles is always lower than the distribution capacity is a problem that needs to be solved now.

Contents of the invention

In order to solve the problem that when the existing charging piles are used at the same time, the actually configured power distribution capacity is less than the sum of the rated power of all charging piles, which affects the safe operation of the charging station. The present invention provides a charging pile group power control method, including:

Based on the parameters of the interaction between each charging pile and the building equipment management system, the priority of each charging pile is determined by using a pre-established priority algorithm;

Calculate the total power of the charging pile group and the remaining available power of the charging pile group based on the parameters of the interaction between the charging piles and the building equipment management system;

When the total power of the charging pile group enters the preset power adjustment buffer zone, the output power of each charging pile is adjusted based on the priority of each charging pile combined with the remaining available power of the charging pile group;

Wherein, the priority algorithm is formulated based on the charging speed factor, basic priority, incremental priority and charging state factor of the electric vehicle.

Preferably, the setting of the power adjustment buffer includes:

Determine the active power warning value based on the general standard value of the distribution transformer capacity;

Determine the difference between the rated active power value of the distribution transformer and the active power warning value as the power adjustment buffer;

Wherein, the parameters for interaction between each charging pile and the building equipment management system include: the capacity of the distribution transformer and the rated active power value of the distribution transformer.

Preferably, the active power warning value is calculated according to the following formula:

P _LimValue = λ·S _Grid , λ<1;

In the formula, λ is the early warning factor when entering the power regulation mode; P _LimValue is the active power early warning value; S _Grid is the capacity of the distribution transformer.

Preferably, the parameters for the interaction between each charging pile and the construction equipment management system also include one or more of the following: charging mode, current state of charge, remaining charging time, accumulated charging time, rated capacity, rated total voltage , initial state of charge, current battery voltage, charge current state, and temperature state.

Preferably, the priority of each charging pile is determined by using a pre-established priority algorithm based on the parameters of interaction between each charging pile and the construction equipment management system, including:

Determine the charging speed factor of the electric vehicle power battery based on the charging mode;

Based on the priority corresponding to the rated capacity of the electric vehicle power battery, the priority corresponding to the rated total voltage, the priority corresponding to the initial state of charge and the priority corresponding to the current battery voltage, determine the basic priority value of the electric vehicle power battery;

Based on the priority corresponding to the charging mode of the electric vehicle power battery, the priority corresponding to the current state of charge, the priority corresponding to the remaining charging time, and the priority corresponding to the accumulated charging time, determine the incremental priority value of the electric vehicle power battery;

Determine the state of charge factor of the electric vehicle power battery based on the state of charge, charging current state and temperature state of the electric vehicle power battery;

Based on the sum of the basic priority value of the electric vehicle power battery and the incremental priority value of the power battery, the product of the charging speed factor of the electric vehicle power battery and the charge state factor of the electric vehicle power battery is obtained to obtain the priority of the charging pile .

Priority, the base priority value is calculated according to the following formula:

K _BasePri = K _{B_Ca} + K _{B_U} + K _{SOC_Init} + K _{U_RealTime} ;

In the formula, K _BasePri is the base priority value; K _{B_Ca} is the priority value corresponding to the rated capacity of the vehicle power battery system; K _{B_U} is the priority value corresponding to the rated total voltage of the vehicle power battery system; K _{SOC_Init} is the vehicle power The priority value corresponding to the initial state of charge of the battery; K _{U_RealTime} is the priority value corresponding to the current battery voltage of the vehicle power battery.

Preferably, the calculation of the total power of the charging pile group and the remaining available power of the charging pile group based on the parameters of the interaction between the charging piles and the construction equipment management system includes:

Determine the power of each charging pile based on the parameters of the interaction between the charging piles and the building equipment management system, and obtain the total power of the charging pile group based on the sum of the powers of the charging piles;

The remaining available power of the charging pile group is obtained by making a difference between the rated active power value of the distribution transformer and the total power of the charging pile group.

Preferably, the adjusting the output power of each charging pile based on the priority of each charging pile combined with the remaining available power of the charging pile group includes:

Determine the power regulation threshold based on the priority of all charging piles;

Among all the charging piles, the output power of the charging piles whose priority is less than the power adjustment threshold is lowered to the lowest output power; the output power of the charging piles whose priority is greater than or equal to the power adjustment threshold is raised;

When the adjusted total output power of all charging piles is less than the total power limit, the charging piles whose priority is lower than the power adjustment threshold are adjusted up in sequence until the adjusted total output power is equal to the total power limit.

Preferably, after calculating the total power of the charging pile group and the remaining available power of the charging pile group based on the parameters of the interaction between each charging pile and the construction equipment management system, it also includes:

When the total power of all charging piles does not enter the preset power adjustment buffer zone, each charging pile outputs power based on the autonomous control mode.

Based on the same inventive concept, the present invention also provides a charging pile group power control system, including:

The priority determination module is used to determine the priority of each charging pile by using a pre-established priority algorithm based on the parameters of the interaction between each charging pile and the building equipment management system;

A calculation module, configured to calculate the total power of the charging pile group and the remaining available power of the charging pile group based on the parameters of the interaction between the charging piles and the construction equipment management system;

A regulation module, configured to regulate the output power of each charging pile based on the priority of each charging pile combined with the remaining available power of the charging pile group when the total power of the charging pile group enters a preset power adjustment buffer;

Wherein, the priority algorithm is formulated based on the charging speed factor, basic priority, incremental priority and charging state factor of the electric vehicle.

In another aspect, the present application also provides a computer device, including:

one or more processors;

The processor is configured to store one or more programs;

When the one or more programs are executed by the one or more processors, the above-mentioned charging pile group power regulation method is realized.

In another aspect, the present application also provides a computer-readable storage medium, which is characterized in that a computer program is stored thereon, and when the computer program is executed, the above-mentioned method for regulating the power of a charging pile group is realized.

Compared with prior art, the beneficial effect of the present invention is:

The present invention provides a method, system, device and medium for controlling the power of a charging pile group, including: based on the interaction parameters between each charging pile and the construction equipment management system, using a pre-established priority algorithm to determine the priority of each charging pile; The parameters for the interaction between the charging piles and the building equipment management system are used to calculate the total power of the charging pile group and the remaining available power of the charging pile group; when the total power of the charging pile group enters the preset power adjustment buffer, based on the The priority of each charging pile is combined with the remaining available power of the charging pile group to regulate the output power of each charging pile; wherein, the priority algorithm is based on the charging speed factor of the electric vehicle, the basic priority, the incremental priority and The state of charge factor is formulated. The invention adopts a priority power control algorithm combined with a charging power control strategy to solve the problem that when the existing charging piles are used at the same time, the actual configured power distribution capacity is less than the sum of the rated power of all charging piles, which affects the safe operation of the charging station. It realizes the adjustment and control that the sum of the actual charging power of all charging piles is less than the actual configured power distribution capacity, ensuring the safe operation of the charging station.

Description of drawings

Fig. 1 is a flow chart of a charging pile group power control method provided by the present invention;

Fig. 2 is a schematic diagram of distribution transformer capacity allocation of the present invention;

Fig. 3 is a composition diagram of the charging priority total number N _{pri_i} of the present invention;

Fig. 4 is a schematic diagram of the structure of the charging pile group in operation of the present invention

FIG. 5 is a schematic diagram of the architecture of the DC charging power regulation system of the present invention.

Detailed ways

In order to better understand the present invention, the content of the present invention will be further described below in conjunction with the accompanying drawings and examples.

Example 1:

The present invention provides a charging pile group power control method, as shown in Figure 1, including:

Step 1: Based on the parameters of the interaction between each charging pile and the building equipment management system, use a pre-established priority algorithm to determine the priority of each charging pile;

Step 2: Calculate the total power of the charging pile group and the remaining available power of the charging pile group based on the parameters of the interaction between the charging piles and the building equipment management system;

Step 3: When the total power of the charging pile group enters the preset power adjustment buffer zone, adjust the output power of each charging pile based on the priority of each charging pile combined with the remaining available power of the charging pile group;

Wherein, the priority algorithm is formulated based on the charging speed factor, basic priority, incremental priority and charging state factor of the electric vehicle.

The power adjustment buffer mentioned in this embodiment sets a "power adjustment buffer" according to the rated capacity of the distribution transformer. When the total output power of the charging pile enters the buffer, the power regulation priority algorithm starts to work, and the charging pile The output power is limited; when the total output power of the charging pile exits the buffer zone, the power regulation priority algorithm no longer works, and the charging pile enters the output power autonomous control mode.

According to the different ratios of the total load power and the total rated power of the distribution transformer, the charging process can be controlled according to different strategies, and the operating status of the distribution transformer can be divided into different modes.

The following is a detailed introduction to the setting of the power adjustment buffer:

The settings of the power adjustment buffer include:

Determine the active power warning value based on the general standard value of the distribution transformer capacity;

Determine the difference between the rated active power value of the distribution transformer and the active power warning value as the power adjustment buffer;

Wherein, the parameters for interaction between each charging pile and the building equipment management system include: the capacity of the distribution transformer and the rated active power value of the distribution transformer. The schematic diagram of distribution transformer capacity allocation is shown in Figure 2.

1) In general, set the actual distribution transformer capacity as S _Grid ,

The rated active power value p of the power supply is generally 0.9 times the capacity value of the transformer.

2) Calculation of active power warning value P _LimValue :

P _LimValue = λ·S _Grid , λ<1;

Among them, λ is the early warning factor when entering the power regulation mode, and the value is 0.75. The power range P _Buf between the active power warning value p _LimValue and the transformer rated active power value P _Grid will be used as a "power adjustment buffer", and the power control priority algorithm works in this range, as follows:

P _Buf = P _Grid - P _LimValue ;

The size of the power buffer may affect the speed of system adjustment. The smaller the power buffer, the faster the system adjustment speed, but the critical state is prone to power shocks; the larger the power buffer, the prematurely enters the power-limited state. Reduce the response speed of the system. In addition, as the charging continues, the charging current decreases, or the charging port exits, and when the available power value is greater than P _Buf , exit the power regulation mode and enter the free power mode.

In step 1 of this embodiment, the priority of each charging pile is determined by using a pre-established priority algorithm based on the interaction parameters between each charging pile and the construction equipment management system, including:

Determine the charging speed factor of the electric vehicle power battery based on the charging mode;

Based on the priority corresponding to the rated capacity of the electric vehicle power battery, the priority corresponding to the rated total voltage, the priority corresponding to the initial state of charge and the priority corresponding to the current battery voltage, determine the basic priority value of the electric vehicle power battery;

Based on the priority corresponding to the charging mode of the electric vehicle power battery, the priority corresponding to the current state of charge, the priority corresponding to the remaining charging time, and the priority corresponding to the accumulated charging time, determine the incremental priority value of the electric vehicle power battery;

Determine the state of charge factor of the electric vehicle power battery based on the current state of charge, charging current state and temperature state of the electric vehicle power battery;

Based on the sum of the basic priority value of the electric vehicle power battery and the incremental priority value of the power battery, the product of the charging speed factor of the electric vehicle power battery and the charge state factor of the electric vehicle power battery is obtained to obtain the priority of the charging pile .

Further, determine the charging speed factor of the power battery of the electric vehicle based on the charging mode, specifically including;

The charging speed factor K _SCM reflects the user's choice of charging speed. It is input from the charging pile interface and is divided into fast charging mode K _{SCM_Quick} and normal charging mode K _{SCM_Normal} . In general, the default setting K _{SCM_Quick} = 1.3, K _{SCM_Normal} = 1.0.

In the fast charging mode, the corresponding charging priority is high, the charging power is guaranteed first, and the charging unit price is expensive, which is suitable for users who need to quickly replenish power within a limited time.

Further, based on the priority corresponding to the rated capacity of the electric vehicle power battery, the priority corresponding to the rated total voltage, the priority corresponding to the initial state of charge and the priority corresponding to the current battery voltage, determine the basic priority of the electric vehicle power battery level values, including:

The basic priority K _BasePri , based on the relevant parameters of the electric vehicle power battery during the charging handshake phase and charging parameter configuration phase on the CAN link, reflects the urgency of the power battery for charging, including:

K _BasePri = K _{B_Ca} + K _{B_U} + K _{SOC_Init} + K _{U_RealTime} ;

Among them: K _{B_Ca} is the priority corresponding to the rated capacity of the vehicle power battery system, K _{B_U} is the priority corresponding to the rated total voltage of the vehicle power battery system, K _{SOC_Init} is the priority corresponding to the initial state of charge of the vehicle power battery, K _{U_RealTime} is the priority corresponding to the current battery voltage of the vehicle power battery.

The larger the rated capacity of the power battery system, it indirectly reflects the characteristics of its large power demand and long-term charging, so its corresponding charging priority is also higher. Taking 40kWh as the benchmark, for every increase or decrease of 5kWh, the priority corresponding to the rated capacity of the vehicle power battery system will increase or decrease by 3 accordingly. The formula is expressed as:

Among them, Q _{B_Ca} is the rated capacity of the vehicle power battery system, and K _{B_Ca} is the priority of the rated capacity of the vehicle power battery system.

The higher the rated total voltage of the battery system, it indirectly reflects the characteristics of high power demand, so the corresponding charging priority is also higher. Taking 400V as the benchmark, for every change of 40V, the priority corresponding to the total rated voltage of the vehicle power battery system changes by 1, and the formula is expressed as:

Among them, _{UB_Total} is the rated total voltage of the vehicle power battery system, and K _{B_U} is the priority corresponding to the rated total voltage of the vehicle power battery system.

The calculation process of the priority K _{SOC_Init} corresponding to the initial state of charge (SOC _Init ) of the vehicle power battery is as follows:

The difference in the current initial SOC affects battery life, charging mode, charging power limit, and the urgency of user charging needs. The formula is expressed as:

K _{SOC_Init} = Function(SOC _Init );

Among them, SOC _Init is the initial state of charge of the vehicle power battery, and K _{SOC_Init} is the priority corresponding to the initial state of charge of the vehicle power battery.

The corresponding relationship between SOC _Init and K _{SOC_Init} is shown in Table 2-2.

Table 2-2 Initial state of charge and its priority number Tab.2-2Initial state of charge and its priority number

The priority K _{U_RealTime} corresponding to the current battery voltage of the vehicle power battery is determined as follows:

The ratio Ratio of the current battery voltage to the rated total voltage of the battery is calibrated with the OCV-SOC curve to obtain the priority parameter, which reflects the impact of the charging voltage on the health of the power battery.

① When 0.967≤Ratio, K _{U_RealTime} = 15;

②When 0.960≤Ratio＜0.967, K _{U_RealTime} ＝2;

③ When Ratio<0.960, K _{U_RealTime} = -5.

Based on the priority corresponding to the charging mode of the electric vehicle power battery, the priority corresponding to the current state of charge, the priority corresponding to the remaining charging time, and the priority corresponding to the accumulated charging time, determine the incremental priority value of the electric vehicle power battery;

Incremental priority ΔK _Pri , based on the relevant parameters of the charging phase on the CAN link, reflects the influence of factors such as the current charging process of the power battery, the current state of charge, the accumulated charging time, and the estimated remaining charging time on the charging priority.

The priority values corresponding to each charging mode K _CM are as follows:

According to the charging characteristics of lithium-ion batteries, that is, the charging characteristics of constant current and then constant voltage, the constant current stage has high power and long time, so it should be guaranteed first.

Therefore, in the constant current charging mode, K _CM =15; in the constant voltage charging mode, K _CM =5.

The priority K _{SOC_RealTime} corresponding to the current state of charge is determined as follows:

Different charging real-time SOC affects factors such as charging progress, charging mode, and charging power distribution. The formula is expressed as:

K _{SOC_RealTime} = Function(SOC _RealTime );

Among them, SOC _RealTime is the current state of charge of the power battery, and K _{SOC_RealTime} is the priority corresponding to the current state of charge of the power battery.

For the correspondence between K _{SOC_RealTime} and SOC _RealTime , see Table 2-3.

Table 2-3 Real-time state of charge and its priority

Tab.2-3 Real-time state of charge and its priority number

The remaining charging time T _Remaining reflects the remaining charging power and power. According to 50Ah, 90kW full charge in one hour, it takes 35 minutes to quickly charge 80%, and the remaining 25 minutes is a low priority; according to the average charge of 2 hours, when the remaining charging time is less than 39 minutes, the priority is 0; within 10 minutes, the estimated remaining charging time corresponds to has a priority of -3.

Then the corresponding priority calculation formula is expressed as:

Among them, T _Remaining estimates the remaining charging time; K _{T_Remaining} is the priority corresponding to the remaining charging time

Reflects the waiting or charging time. The first 15 minutes are not counted, and every 20 minutes thereafter, the priority corresponding to the accumulated charging time increases by 5.

Then the priority calculation formula in this scenario is:

为向下取整符号。Among them, T _Total is the cumulative charging time, K _{T_Total} is the priority corresponding to the cumulative charging time,

is the rounding down symbol.

Determine the state of charge factor of the electric vehicle power battery based on the current state of charge, charging current state and temperature state of the electric vehicle power battery;

The priority values corresponding to the current charging state factor K _CS are as follows:

The current state of charge factor K _CS measures the state of health of the power battery pack in the process of charging regulation: it is divided into good state and sub-health state. When the state is good, K _{CS_G} =1.0.

There are three situations in the sub-health state:

1) When the SOC is too high/low, K _{CS_SOC} =0.5, otherwise K _{CS_SOC} =1.0;

Too high/low SOC will pose a greater threat to the health and safety of the power battery, so it is necessary to reduce the charging current in a timely manner.

2) When the battery is charged with overcurrent, K _{CS_OverCur} =0.5, otherwise, K _{CS_OverCur} =1.0;

Battery charging overcurrent will pose a greater safety threat to related equipment, so it is necessary to reduce the charging current in a timely manner.

3) When the battery temperature is too high, K _{CS_OverTemp} =0.9, otherwise K _{CS_OverTemp} =1.0.

Excessive battery temperature affects the safety of the power battery, so it is necessary to reduce the priority and then reduce the charging current. However, considering the slow response to temperature reduction, the adjustment coefficient should not be too low, otherwise the overshoot will have a greater impact on other priority factors.

Then the expression of the current state of charge factor is:

K _CS ＝ K _{CS_G} · K _{CS_SOC} · K _{CS_OverCur} · K _{CS_OverTemp}

Based on the sum of the basic priority value of the electric vehicle power battery and the incremental priority value of the power battery, the product of the charging speed factor of the electric vehicle power battery and the charge state factor of the electric vehicle power battery is obtained to obtain the priority of the charging pile .

It is determined according to the initial state, charging speed, power demand and other factors of the electric vehicle connected to the charging pile, and is calculated according to the following formula:

Charging priority = (charging speed factor) × (basic priority + incremental priority) × (charging state factor)

From the text expression and the above relevant parameters, the following calculation formula can be obtained:

N _{Pri_i} = K _SCM · (K _BasePri +ΔK _Pri ) · K _CS

Thus, the real-time total number of priorities N _{Pri_i} can be calculated according to relevant parameters, as shown in FIG. 3 .

In this embodiment, the total power of the charging pile group and the remaining available power of the charging pile group are calculated based on the parameters of the interaction between the charging piles and the construction equipment management system in step 2, including:

Determine the power of each charging pile based on the parameters of the interaction between the charging piles and the building equipment management system, and obtain the total power of the charging pile group based on the sum of the powers of the charging piles;

The remaining available power of the charging pile group is obtained by making a difference between the rated active power value of the distribution transformer and the total power of the charging pile group.

Further, the power of each charging pile is determined based on the parameters of the interaction between each charging pile and the construction equipment management system, and the total power of the charging pile group is obtained based on the sum of the power of each charging pile, specifically including: Initialization, controller power-on initialization and networking. After the electric vehicle is connected to the charging gun, the CAN communication process starts.

During the charging handshake phase and charging parameter configuration phase, the power controller PCM only monitors and records the parameter information about the charging pile and the power battery on the CAN communication link, and saves it in the PCM’s Flash storage for subsequent parameter calculation. parameters are regulated.

In the charging phase, the power controller monitors and saves the BCL/BCS/CCS/BSM messages on the CAN link, and sends data to other power controllers through the power control bus in sequence, as shown in Table 2-4.

Table 2-4 Summary of interactive information on the power control bus

Tab.2-4 Sorting out the information exchanged on the power control bus

Firstly, the respective charging priorities N _{Pri_i} are calculated in real time. According to the calculation formula, enter the relevant parameters, you can calculate your own charging priority N _{Pri_i} .

Then, calculate and save the real-time requested power of the power controller.

P _{Req_i} = U _{Req_i} · I _{Req_i} ;

In the formula, U _{Req_i} is the real-time request voltage of the i-th charging pile, I _{Req_i} is the real-time request current of the i-th charging pile, and P _{Req_i} is the real-time request power of the i-th charging pile.

Finally, send the group of parameters [N _Adder , P _{Req_i} , N _{Pri_i} ] to the power control bus according to the time sequence, and receive real-time parameters [N _Adder , P _{Req_i} , N _{Pri_i} ] from other power controllers from the power control bus, And save it, it will be used in the calculation of power control.

Further, the remaining available power of the charging pile group is obtained by making a difference between the rated active power value of the distribution transformer and the total power of the charging pile group, which specifically includes:

After each power controller sends and receives data sequentially according to the above sequence, the next processing sequence is as follows:

1) Calculate the real-time maximum total power P _{MAX_Total} :

In the formula, P _{MAX_Total} is the real-time maximum total power of the power controller.

2) Calculate the remaining available power P _RemainAvailb :

P _RemainAvailb = P _Transf - P _{MAX_Total} ;

In the formula, P _RemainAvailb is the remaining available power, and P _Transf is the real-time power.

In this embodiment, the output power of each charging pile is regulated based on the priority of each charging pile in step 3 combined with the remaining available power of the charging pile group, including:

Determine the power regulation threshold based on the priority of all charging piles;

Among all the charging piles, the output power of the charging piles whose priority is less than the power adjustment threshold is lowered to the lowest output power; the output power of the charging piles whose priority is greater than or equal to the power adjustment threshold is raised;

When the adjusted total output power of all charging piles is less than the total power limit, the charging piles whose priority is lower than the power adjustment threshold are adjusted up in sequence until the adjusted total output power is equal to the total power limit.

Further, determining the power adjustment threshold based on the priority of all charging piles specifically includes: all running charging piles participate in the sorting, the priority is from high to bottom, the middle value is the priority median value, and the median value of all charging piles is used as The priority of all charging piles determines the power regulation threshold. Further, among all the charging piles, the output power of the charging piles whose priority is less than the power adjustment threshold is lowered to the lowest output power; the output power of the charging piles whose priority is greater than or equal to the power adjustment threshold is raised, specifically including :

1) When the priority of any charging pile is less than the median value of all charging pile priorities, the power controller of the charging pile will lower its output power to the preset minimum output power.

2) For charging piles whose priority is greater than the median priority of all charging piles, the output power of the charging piles will be adjusted up to the allowable preset value on the basis of the existing ones. Further, when the adjusted total output power of all charging piles is less than the total power limit, the charging piles whose priority is lower than the power adjustment threshold are adjusted up in sequence until the adjusted total output power is equal to the total Power caps, specifically:

First adjust the output power of the charging piles whose priority is lower than the median value to the minimum, and then increase the corresponding output power of the controller with higher priority in turn. If there is still available power at this time, continue to increase the power according to the method in 2) until the preset total power limit is reached.

Example 2:

Based on the same inventive concept, the present invention also provides a charging pile group power control system, including:

The priority determination module is used to determine the priority of each charging pile by using a pre-established priority algorithm based on the parameters of the interaction between each charging pile and the building equipment management system;

A calculation module, configured to calculate the total power of the charging pile group and the remaining available power of the charging pile group based on the parameters of the interaction between the charging piles and the construction equipment management system;

A regulation module, configured to regulate the output power of each charging pile based on the priority of each charging pile combined with the remaining available power of the charging pile group when the total power of the charging pile group enters a preset power adjustment buffer;

Wherein, the priority algorithm is formulated based on the charging speed factor, basic priority, incremental priority and charging state factor of the electric vehicle.

The prioritization module is used specifically for:

It is determined according to the initial state, charging speed, power demand and other factors of the electric vehicle connected to the charging pile, and is calculated according to the following formula:

Charging priority = (charging speed factor) × (basic priority + incremental priority) × (charging state factor)

Determine the charging speed factor of the electric vehicle power battery based on the charging mode;

The charging speed factor K _SCM reflects the user's choice of charging speed. It is input from the charging pile interface and is divided into fast charging mode K _{SCM_Quick} and normal charging mode K _{SCM_Normal} . In general, the default setting K _{SCM_Quick} = 1.3, K _{SCM_Normal} = 1.0.

In the fast charging mode, the corresponding charging priority is high, the charging power is guaranteed first, and the charging unit price is expensive, which is suitable for users who need to quickly replenish power within a limited time.

The basic priority K _BasePri , based on the relevant parameters of the electric vehicle power battery during the charging handshake phase and charging parameter configuration phase on the CAN link, reflects the urgency of the power battery for charging, including:

K _BasePri = K _{B_Ca} + K _{B_U} + K _{SOC_Init} + K _{U_RealTime} ;

Among them: K _{B_Ca} is the priority corresponding to the rated capacity of the vehicle power battery system, K _{B_U} is the priority corresponding to the rated total voltage of the vehicle power battery system, K _{SOC_Init} is the priority corresponding to the initial state of charge of the vehicle power battery, K _{U_RealTime} is the priority corresponding to the current battery voltage of the vehicle power battery.

The larger the rated capacity of the power battery system, it indirectly reflects the characteristics of its large power demand and long-term charging, so its corresponding charging priority is also higher. Taking 40kWh as the benchmark, for every increase or decrease of 5kWh, the priority corresponding to the rated capacity of the vehicle power battery system will increase or decrease by 3 accordingly. The formula is expressed as:

Among them, Q _{B_Ca} is the rated capacity of the vehicle power battery system, and K _{B_Ca} is the priority of the rated capacity of the vehicle power battery system.

The higher the rated total voltage of the battery system, it indirectly reflects the characteristics of high power demand, so the corresponding charging priority is also higher. Taking 400V as the benchmark, for every change of 40V, the priority corresponding to the total rated voltage of the vehicle power battery system changes by 1, and the formula is expressed as:

Among them, _{UB_Total} is the rated total voltage of the vehicle power battery system, and K _{B_U} is the priority corresponding to the rated total voltage of the vehicle power battery system.

The calculation process of the priority K _{SOC_Init} corresponding to the initial state of charge (SOC _Init ) of the vehicle power battery is as follows:

The difference in the current initial SOC affects battery life, charging mode, charging power limit, and the urgency of user charging needs. The formula is expressed as:

K _{SOC_Init} = Function(SOC _Init );

Among them, SOC _Init is the initial state of charge of the vehicle power battery, and K _{SOC_Init} is the priority corresponding to the initial state of charge of the vehicle power battery.

The corresponding relationship between SOC _Init and K _{SOC_Init} is shown in the table below.

Initial state of charge and its priority

Initial state of charge and its priority number

The priority K _{U_RealTime} corresponding to the current battery voltage of the vehicle power battery is determined as follows:

The ratio Ratio of the current battery voltage to the rated total voltage of the battery is calibrated with the OCV-SOC curve to obtain the priority parameter, which reflects the impact of the charging voltage on the health of the power battery.

① When 0.967≤Ratio, K _{U_RealTime} = 15;

②When 0.960≤Ratio＜0.967, K _{U_RealTime} ＝2;

③ When Ratio<0.960, K _{U_RealTime} = -5.

Incremental priority ΔK _Pri , based on the relevant parameters of the charging phase on the CAN link, reflects the influence of factors such as the current charging process of the power battery, the current state of charge, the accumulated charging time, and the estimated remaining charging time on the charging priority.

The priority values corresponding to each charging mode K _CM are as follows:

According to the charging characteristics of lithium-ion batteries, that is, the charging characteristics of constant current and then constant voltage, the constant current stage has high power and long time, so it should be guaranteed first.

Therefore, in the constant current charging mode, K _CM =15; in the constant voltage charging mode, K _CM =5.

The priority K _{SOC_RealTime} corresponding to the current state of charge (SOC _RealTime ) is calculated as follows:

Different charging real-time SOC affects factors such as charging progress, charging mode, and charging power distribution. The formula is expressed as:

K _{SOC_RealTime} = Function(SOC _RealTime );

Among them, SOC _RealTime is the current state of charge of the power battery, and K _{SOC_RealTime} is the priority corresponding to the current state of charge of the power battery.

The correspondence between K _{SOC_RealTime} and SOC _RealTime is detailed in the table below.

Real-time state of charge and its priority

Real-time state of charge and its priority number

The remaining charging time T _Remaining reflects the remaining charging power and power. According to 50Ah, 90kW full charge in one hour, it takes 35 minutes to quickly charge 80%, and the remaining 25 minutes is a low priority; according to the average charge of 2 hours, when the remaining charging time is less than 39 minutes, the priority is 0; within 10 minutes, the estimated remaining charging time corresponds to Priority -3.

Then the corresponding priority calculation formula is expressed as:

Among them, T _Remaining estimates the remaining charging time; K _{T_Remaining} is the priority corresponding to the remaining charging time

Reflects the waiting or charging time. The first 15 minutes are not counted, and every 20 minutes thereafter, the priority corresponding to the accumulated charging time increases by 5.

Then the priority calculation formula in this scenario is:

为向下取整符号。Among them, T _Total is the cumulative charging time, K _{T_Total} is the priority corresponding to the cumulative charging time,

is the rounding down symbol.

The priority K _CS value corresponding to the current charging state factor is as follows:

The current state of charge factor K _CS measures the state of health of the power battery pack in the process of charging regulation: it is divided into a good state and a sub-health state. When the state is good, K _{CS_G} =1.0.

There are three situations in the sub-health state:

1) When the SOC is too high/low, K _{CS_SOC} =0.5, otherwise K _{CS_SOC} =1.0;

Too high/low SOC will pose a greater threat to the health and safety of the power battery, so it is necessary to reduce the charging current in a timely manner.

2) When the battery is charged with overcurrent, K _{CS_OverCur} =0.5, otherwise, K _{CS_OverCur} =1.0;

Battery charging overcurrent will pose a greater safety threat to related equipment, so it is necessary to reduce the charging current in a timely manner.

3) When the battery temperature is too high, K _{CS_OverTemp} =0.9, otherwise K _{CS_OverTemp} =1.0.

Excessive battery temperature affects the safety of the power battery, so it is necessary to reduce the priority and then reduce the charging current. However, considering the slow response to temperature reduction, the adjustment coefficient should not be too low, otherwise the overshoot will have a greater impact on other priority factors.

Then the expression of the current state of charge factor is:

K _CS ＝ K _{CS_G} · K _{CS_SOC} · K _{CS_OverCur} · K _{CS_OverTemp}

The calculation module is used specifically for:

During the charging handshake phase and charging parameter configuration phase, the power controller PCM only monitors and records the parameter information about the charging pile and the power battery on the CAN communication link, and saves it in the PCM’s Flash storage for subsequent parameter calculation. parameters are regulated.

In the charging phase, the power controller monitors and saves the BCL/BCS/CCS/BSM messages on the CAN link, and sends data to other power controllers through the power control bus in sequence, as shown in the table below.

Combination of interactive information on the power control bus

Sorting out the information exchanged on the power control bus

Firstly, the respective charging priorities N _{Pri_i} are calculated in real time. According to the calculation formula, enter the relevant parameters, you can calculate your own charging priority N _{Pri_i} .

Then, calculate and save the real-time requested power of the power controller.

P _{Req_i} = U _{Req_i} · I _{Req_i} ;

Finally, send the group of parameters [N _Adder , P _{Req_i} , N _{Pri_i} ] to the power control bus according to the time sequence, and receive real-time parameters [N _Adder , P _{Req_i} , N _{Pri_i} ] from other power controllers from the power control bus, And save it, it will be used in the calculation of power control.

After each power controller sends and receives data sequentially according to the above sequence, the next processing sequence is as follows:

1) Calculate the real-time maximum total power P _{MAX_Total} :

2) Calculate the remaining available power P _RemainAvailb :

P _RemainAvailb = P _Transf - P _{MAX_Total} ;

The control module is specifically used for:

1) When the priority of any charging pile is less than the median value of all charging pile priorities, the power controller of the charging pile will lower its output power to the preset minimum output power.

2) For charging piles whose priority is greater than the median priority of all charging piles, the output power of the charging piles will be adjusted up to the allowable preset value on the basis of the existing ones.

First adjust the output power of the charging piles whose priority is lower than the median value to the minimum, and then increase the corresponding output power of the controller with higher priority in turn. If there is still available power at this time, continue to increase the power according to the method in 2) until the preset total power limit is reached.

Example 3:

The following is a detailed introduction to a charging pile group power regulation method:

As shown in Figure 4, it can be seen that the structure of the charging pile group is running, and the system architecture of the charging information control network shown in Figure 5, it can be seen that the power controller adjusts the output power of the charging pile connected to it. The power information is exchanged between the two power controllers through the power control bus, and the available power can be flexibly adjusted and allocated.

The charging power regulation process is as follows:

When the goal of regulating power is achieved, the regulation process can be divided into the following steps:

In the first step, after the electric vehicle is connected to the charging pile through the charging gun, the power controller PCM on the communication link of the charging gun monitors the interactive data between the charging pile and the BMS on the CAN communication link, including rated parameters, such as battery pack capacity, Maximum charging voltage, maximum charging current, minimum output voltage, minimum output current and other information and real-time parameters, such as voltage demand, current demand, charging mode, current state of charge, estimated remaining charging time, voltage output value, current output value, cumulative charging time and other information.

The second step is to report the real-time data of this power controller, including three parameters including the address of the power controller, the required power and the total number of priorities, and receive the real-time parameters of other power controllers in sequence, including the power of other power controllers Controller address, required power and priority.

In the third step, each power controller calculates the real-time total power and remaining available total power, and adjusts the output power of each charging pile according to the priority parameters.

The modes of the charging control system in different time periods are described as follows:

When the distribution transformer is powered on, the charging power controller is powered on and enters the standby state:

1) The charging control process during the idle period is as follows:

When a small number of electric vehicles are connected to the charging piles one after another, the sum of the rated power of the charging piles is less than the transformer active power warning value of 0.75 S _Grid , and each power controller only monitors and exchanges real-time parameters and calculates the remaining Parameters such as available power do not regulate the charging power.

2) The charging control process from the idle period to the busy period is as follows:

With the addition of charging vehicles, the real-time total charging power of the charging pile group will gradually approach the transformer active power warning value of 0.75 S _Grid process control, if it does not exceed, still press 1)

When the real-time charging total power of the charging pile group is equal to or greater than the transformer active power warning value of 0.75 S _Grid and less than the rated active power of the transformer 0.9 S _Grid , each charging power controller will control the electric vehicles connected to the charging pile according to the priority. The charging power is adjusted:

① When the priority of any charging pile is less than the median value of all charging pile priorities, the power controller of the charging pile will lower its output power to the preset minimum output power.

② For charging piles whose priority is greater than the median priority of all charging piles, the output power of the charging piles shall be adjusted up to the allowable preset value on the basis of the existing ones.

According to the above rules, first adjust the output power of the charging piles whose priority is lower than the median value to the minimum, and then sequentially increase the output power corresponding to the controller with higher priority. If there is still available power at this time, continue to increase the power according to the method in ② until the preset total power limit of 0.9·S _Grid is reached.

3) The charging control process during the busy period is as follows:

When the real-time charging total power of the charging pile group is equal to or greater than the transformer active power warning value of 0.75 S _Grid , but less than the transformer rated active power of 0.9 S _Grid , the charging power will be lower than the median value of the priority according to the charging priority. The output power is lowered, and the output power whose priority is higher than the median value of the priority is adjusted higher.

At this time, the total active power output by the transformer is close to full-load operation and is dynamically stable, but the active power is increasing and decreasing among the charging piles due to different priorities.

4) The charging regulation process from busy period to idle period is as follows:

As the charging progresses, after the charging peak passes, when the charging power drops below the charging power warning value, the charging power regulation changes from the limited power mode to the power autonomous control mode.

Example 4:

Based on the same inventive concept, the present invention also provides a computer device, the computer device includes a processor and a memory, the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the Program instructions stored on a computer storage medium. The processor may be a central processing unit (Central Processing Unit, CPU), or other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays ( Field-Programmable GateArray, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc., which are the computing core and control core of the terminal, which are suitable for implementing one or more instructions, and are specifically suitable for loading And execute one or more instructions in the computer storage medium so as to realize the corresponding method flow or corresponding function, so as to realize the steps of the general design tower main technical condition combination optimization method in the above embodiment.

Example 5:

Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory). The computer-readable storage medium is a memory device in a computer device for storing programs and data. It can be understood that the computer-readable storage medium here may include a built-in storage medium in the computer device, and of course may also include an extended storage medium supported by the computer device. The computer-readable storage medium provides storage space, and the storage space stores the operating system of the terminal. Moreover, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions may be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here may be a high-speed RAM memory, or a non-volatile memory (non-volatile memory), such as at least one magnetic disk memory. One or more instructions stored in the computer-readable storage medium can be loaded and executed by the processor, so as to realize the steps of the method for optimizing the combination of main technical conditions of general design towers in the above-mentioned embodiments.

Apparently, the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

The above are only embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the pending application of the present invention. within the scope of the claims.

Claims (12)

1. A charging pile group power control method, characterized in that, comprising: Based on the parameters of the interaction between each charging pile and the building equipment management system, the priority of each charging pile is determined by using a pre-established priority algorithm; Calculate the total power of the charging pile group and the remaining available power of the charging pile group based on the parameters of the interaction between the charging piles and the building equipment management system; When the total power of the charging pile group enters the preset power adjustment buffer zone, the output power of each charging pile is adjusted based on the priority of each charging pile combined with the remaining available power of the charging pile group; Wherein, the priority algorithm is formulated based on the charging speed factor, basic priority, incremental priority and charging state factor of the electric vehicle. 2. The method according to claim 1, wherein the setting of the power adjustment buffer comprises: Determine the active power warning value based on the general standard value of the distribution transformer capacity; Determine the difference between the rated active power value of the distribution transformer and the active power warning value as the power adjustment buffer; Wherein, the parameters for interaction between each charging pile and the building equipment management system include: the capacity of the distribution transformer and the rated active power value of the distribution transformer. 3. method as claimed in claim 2, is characterized in that, described active power warning value is calculated as follows: P _LimValue = λ·S _Grid , λ<1; In the formula, λ is the early warning factor when entering the power regulation mode; P _LimValue is the active power early warning value; S _Grid is the capacity of the distribution transformer. 4. The method according to claim 2, wherein the parameters for interaction between each charging pile and the construction equipment management system further include one or more of the following: charging mode, current state of charge, remaining charge Time, cumulative charging time, rated capacity, rated total voltage, initial state of charge, current battery voltage, charging current state, and temperature state. 5. The method according to claim 4, characterized in that, based on the parameters of the interaction between each charging pile and the construction equipment management system, using a pre-established priority algorithm to determine the priority of each charging pile, including: Determine the charging speed factor of the electric vehicle power battery based on the charging mode; Based on the priority corresponding to the rated capacity of the electric vehicle power battery, the priority corresponding to the rated total voltage, the priority corresponding to the initial state of charge and the priority corresponding to the current battery voltage, determine the basic priority value of the electric vehicle power battery; Based on the priority corresponding to the charging mode of the electric vehicle power battery, the priority corresponding to the current state of charge, the priority corresponding to the remaining charging time, and the priority corresponding to the accumulated charging time, determine the incremental priority value of the electric vehicle power battery; Determine the state of charge factor of the electric vehicle power battery based on the current state of charge, charging current state and temperature state of the electric vehicle power battery; Based on the sum of the basic priority value of the electric vehicle power battery and the incremental priority value of the power battery, the product of the charging speed factor of the electric vehicle power battery and the charge state factor of the electric vehicle power battery is obtained to obtain the priority of the charging pile . 6. The method according to claim 5, wherein the base priority value is calculated as follows: K _BasePri = K _{B_Ca} + K _{B_U} + K _{SOC_Init} + K _{U_RealTime} ; In the formula, K _BasePri is the base priority value; K _{B_Ca} is the priority value corresponding to the rated capacity of the vehicle power battery system; K _{B_U} is the priority value corresponding to the rated total voltage of the vehicle power battery system; K _{SOC_Init} is the vehicle power The priority value corresponding to the initial state of charge of the battery; K _{U_RealTime} is the priority value corresponding to the current battery voltage of the vehicle power battery. 7. The method according to claim 6, wherein the calculation of the total power of the charging pile group and the remaining available power of the charging pile group based on the parameters of the interaction between the charging piles and the construction equipment management system includes: Determine the power of each charging pile based on the parameters of the interaction between the charging piles and the building equipment management system, and obtain the total power of the charging pile group based on the sum of the powers of the charging piles; The remaining available power of the charging pile group is obtained by making a difference between the rated active power value of the distribution transformer and the total power of the charging pile group. 8. The method according to claim 1, wherein the adjusting the output power of each charging pile based on the priority of each charging pile combined with the remaining available power of the charging pile group includes: Determine the power regulation threshold based on the priority of all charging piles; Among all the charging piles, the output power of the charging piles whose priority is less than the power adjustment threshold is lowered to the lowest output power; the output power of the charging piles whose priority is greater than or equal to the power adjustment threshold is raised; When the adjusted total output power of all charging piles is less than the total power limit, the charging piles whose priority is lower than the power adjustment threshold are adjusted up in sequence until the adjusted total output power is equal to the total power limit. 9. The method according to claim 1, characterized in that, after calculating the total power of the charging pile group and the remaining available power of the charging pile group based on the parameters of the interaction between each charging pile and the construction equipment management system, it further includes: When the total power of all charging piles does not enter the preset power adjustment buffer zone, each charging pile outputs power based on the autonomous control mode. 10. A charging pile group power control system, characterized in that it includes: The priority determination module is used to determine the priority of each charging pile by using a pre-established priority algorithm based on the parameters of the interaction between each charging pile and the building equipment management system; A calculation module, configured to calculate the total power of the charging pile group and the remaining available power of the charging pile group based on the parameters of the interaction between the charging piles and the construction equipment management system; A regulation module, configured to regulate the output power of each charging pile based on the priority of each charging pile combined with the remaining available power of the charging pile group when the total power of the charging pile group enters a preset power adjustment buffer; Wherein, the priority algorithm is formulated based on the charging speed factor, basic priority, incremental priority and charging state factor of the electric vehicle. 11. A computer device, comprising: one or more processors; The processor is configured to store one or more programs; When the one or more programs are executed by the one or more processors, a charging pile group power regulation method according to any one of claims 1 to 9 is realized. 12. A computer-readable storage medium, characterized in that a computer program is stored thereon, and when the computer program is executed, the power regulation of a charging pile group according to any one of claims 1 to 9 is realized method.

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