CN117674228B - Net-structured energy storage system - Google Patents
Net-structured energy storage system Download PDFInfo
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- CN117674228B CN117674228B CN202311653250.0A CN202311653250A CN117674228B CN 117674228 B CN117674228 B CN 117674228B CN 202311653250 A CN202311653250 A CN 202311653250A CN 117674228 B CN117674228 B CN 117674228B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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Abstract
本发明提供了一种构网型储能系统，属于储能技术领域，其系统包括：电池模块：用于采集所述电池的运行数据；储能管理模块：获取电池管理单元的数据，并基于所述电池运行数据建立储能模型，确定所述电池在某一时刻所储的能量；储能控制模块：根据计算到的所储的能量与当前电能需求对比，若发电过剩则将电能存储起来，若发电缺乏将电能释放出来；故障诊断模块：对电池及变流器的运行过程持续监控，得到储能故障信息；紧急支撑模块：基于所述储能故障信息提供电能紧急支撑，得到电能紧急支撑事件信息；储能分析模块：分析当前储能系统运行故障出现原因。解决了背景技术中当电能发生变化时需确保电力系统稳定性的问题。
The present invention provides a grid-type energy storage system, which belongs to the field of energy storage technology. The system includes: a battery module: used to collect the operating data of the battery; an energy storage management module: to obtain the data of the battery management unit, and to establish an energy storage model based on the battery operating data to determine the energy stored by the battery at a certain moment; an energy storage control module: to compare the calculated stored energy with the current power demand, to store the power if there is excess power generation, and to release the power if there is a lack of power generation; a fault diagnosis module: to continuously monitor the operation process of the battery and the converter to obtain energy storage fault information; an emergency support module: to provide power emergency support based on the energy storage fault information, and to obtain power emergency support event information; an energy storage analysis module: to analyze the cause of the current energy storage system operation fault. The problem of ensuring the stability of the power system when the power changes in the background technology is solved.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to a net-structured energy storage system.
Background
The traditional power generation mode (hydroelectric power generation, thermal power generation, nuclear power generation and diesel power generation) is stable, but with the high-speed development of new energy, the traditional power generation duty ratio is gradually reduced, and the high-proportion new energy and high-proportion power electronic equipment bring stability problems (insufficient inertia support, insufficient voltage support and insufficient frequency support) to a power system, so that large-area power failure and power grid paralysis are caused under serious conditions.
The existing energy storage system is insufficient in a fault analysis part, the existing faults often need to be judged manually, the fault types in the network-structured energy storage system cannot be identified and processed intelligently, and the system cannot respond in time when the electric quantity is insufficient or a circuit has a problem. In addition, the existing network construction system does not have a storage function, and after a fault event occurs, the existing fault cannot be judged according to the past experience. Therefore, there is an urgent need for an energy storage system that ensures balance stability when the power of the power system varies.
Therefore, the invention provides a net-structured energy storage system.
Disclosure of Invention
The invention provides a net-structured energy storage system, which comprises: a battery module: the system comprises a plurality of batteries and a plurality of battery management units, wherein the battery management units are used for collecting operation data of the batteries; the energy storage management module: the battery management unit is connected with the battery module, acquires data of the battery management unit, establishes an energy storage model based on the battery operation data, and determines energy stored by the battery at a certain moment; the energy storage control module: the energy storage management module is connected with the power storage management module, the stored energy is compared with the current electric energy demand according to the calculated energy, if the power generation is excessive, the electric energy is stored, and if the power generation is lack, the electric energy is released; and a fault diagnosis module: the energy storage management module is connected with the power supply module, and is used for continuously monitoring the running process of the battery and the current transformer to obtain energy storage fault information; emergency support module: the fault diagnosis module is connected with the power emergency support module, and provides power emergency support based on the energy storage fault information to obtain power emergency support event information; the energy storage analysis module: and the energy storage management module, the fault diagnosis module and the emergency support module are connected with each other, the occurrence reason of the operation fault of the current energy storage system is analyzed, and the electric energy emergency event support information and the battery operation state at the time of emergency support are recorded. The problem that the stability of a power system needs to be ensured when electric energy changes in the background technology is solved.
The invention provides a net-structured energy storage system, which comprises:
a battery module: the system comprises a plurality of batteries and a plurality of battery management units, wherein the battery management units are used for collecting operation data of the batteries;
The energy storage management module: the battery management unit is connected with the battery module, acquires data of the battery management unit, establishes an energy storage model based on the battery operation data, and determines energy stored by the battery at a certain moment;
the energy storage control module: the energy storage management module is connected with the power storage management module, the stored energy is compared with the current electric energy demand according to the calculated energy, if the power generation is excessive, the electric energy is stored, and if the power generation is lack, the electric energy is released;
And a fault diagnosis module: the energy storage management module is connected with the power supply module, and is used for continuously monitoring the running process of the battery and the current transformer to obtain energy storage fault information;
Emergency support module: the fault diagnosis module is connected with the power emergency support module, and provides power emergency support based on the energy storage fault information to obtain power emergency support event information;
the energy storage analysis module: and the energy storage management module, the fault diagnosis module and the emergency support module are connected with each other, the occurrence reason of the operation fault of the current energy storage system is analyzed, and the electric energy emergency event support information and the battery operation state at the time of emergency support are recorded.
Preferably, the energy storage management module includes:
Parameter acquisition unit: the method comprises the steps of connecting with a battery module, acquiring operation data of the battery, and calculating a lower limit and an upper limit of charging power of an electric energy storage system, a lower limit and an upper limit of energy storage capacity of the energy storage system, a self-discharge coefficient, a charging efficiency coefficient and a discharging efficiency coefficient based on the battery operation data;
the energy storage model building unit: an energy storage model is built according to the lower limit and the upper limit of the charging power, the lower limit and the upper limit of the energy storage capacity, the self-discharge coefficient, the charging efficiency coefficient and the discharging efficiency coefficient of the energy storage system, and the following formula is adopted:
Wherein, E (k+1) represents the energy storage electric quantity which can be output at time k+1, E k,max represents the upper limit of the energy storage capacity of the energy storage system at time k, E k,min represents the lower limit of the energy storage capacity of the energy storage system at time k, T 1 represents the charging efficiency coefficient, T 2 represents the discharging efficiency coefficient, α represents the self-discharging coefficient, and the calculation of the charging state and the discharging state is both constrained by power P, wherein, the power constraint formula of the charging state is as follows: p min·T1≤P≤Pmax·T1, wherein P min represents a lower limit of the charging power, and P max represents an upper limit of the charging power; the power constraint formula of the discharge state is: p min·T2≤P≤Pmax·T2.
Preferably, the energy storage control module includes:
A grid-structured converter control unit: the method is used for acquiring additional reference power of the power grid, potential virtual phase angles of the energy storage converter, internal potential amplitude values output by the converter and current inner loop reference values, and determining reference voltages under a three-phase coordinate system, so that the energy storage system is controlled.
Preferably, the grid-structured converter control unit includes:
a power acquisition unit: acquiring additional reference power based on the actual frequency of the power grid;
phase angle acquisition unit: acquiring an internal potential virtual phase angle output by the energy storage converter based on the additional reference power;
an internal potential amplitude acquisition unit: acquiring an internal potential amplitude value output by the energy storage converter based on the output end voltage and the output end current of the converter;
A current reference value calculation unit: calculating a current inner loop reference value based on the inner potential amplitude;
Voltage reference value calculation unit: determining a reference voltage in a three-phase stationary coordinate system based on the current inner loop reference value and an inner potential virtual phase angle;
an energy storage control unit: and controlling the energy storage system according to the trigger pulse output by the reference voltage based on the Pulse Width Modulation (PWM) generator.
Preferably, the fault diagnosis module includes:
and a detection unit: the system is connected with the energy storage management module and is used for setting a plurality of detection points in the system, detecting faults in the running process and generating a fault instruction;
diagnosis unit: and the detection unit is connected with the power supply unit and is used for receiving the fault instruction, comprehensively evaluating the battery state and generating energy storage fault early warning information.
Preferably, the diagnostic unit comprises:
Fault analysis unit: the fault instruction is obtained, the energy storage fault information is analyzed, and the fault occurrence reasons are obtained, wherein the fault occurrence reasons comprise small electric quantity in the system and faults of internal circuits of the system;
A classification alarm unit: and generating first early warning information and second early warning information according to the fault cause, wherein the first early warning information comprises less electric quantity in the system, and the second early warning information comprises faults of internal circuits of the system.
Preferably, the emergency support module comprises:
a calculation unit: the system comprises a classification alarm unit, a first early warning information instruction and a second early warning information instruction, wherein the classification alarm unit is connected with the first early warning information instruction;
Configuration unit: the power supply device is connected with the calculation unit, calculates the longest support time when the energy storage system loses power according to the residual electric quantity of the energy storage system, adjusts a charge-discharge power curve, and configures optimal power distribution based on the longest support time;
Constraint unit: and constraining the voltage and the current of the power grid node according to the optimal power distribution, and ensuring that the voltage and the current are within a set threshold value.
Preferably, the emergency support module further comprises:
And a control unit: acquiring the second early warning instruction information, and controlling the disconnection of the branch circuit with the fault and the bus;
And a monitoring unit: and monitoring the voltage of the battery cluster in the cut-off branch, and controlling the rest branch to be cut off from the bus when the voltage of the battery cluster in the cut-off branch is reduced to a preset value.
Preferably, the energy storage analysis module includes:
capacity analysis unit: analyzing the cause of the failure of the energy storage capacity of the current energy storage system, and determining the cause of the capacity reduction of the system;
event recording unit: and recording electric energy emergency supporting information, the running state of the battery at the moment when the emergency supporting time occurs and the reason for the capacity reduction of the system, and storing the electric energy emergency supporting information and the reason into an energy storage database of the system.
Preferably, the capacity analysis unit includes:
Extraction unit: extracting voltage values, temperature values and capacity values of each battery monomer in the energy storage system in the same charging period and the same discharging period of the preset number, and generating a voltage history curve, a temperature history curve and a capacity history curve of the energy storage system;
And a comparison unit: comparing voltage history curves, temperature history curves or capacity history curves of different battery monomers in the same charging period or the same discharging period, and determining the battery monomers causing the capacity reduction of the system;
a judging unit: judging whether the voltage history curves of the battery cells to be replaced in different charging periods or discharging periods are the same or not; if the initial capacity of the battery monomer to be replaced is small; if the battery cells to be replaced are different, the battery capacity is reduced due to excessive consumption.
Compared with the prior art, the invention has the beneficial effects that:
1. The new energy power generation (wind power and photovoltaic) is integrated into a power system (power grid) through converter equipment (alternating current-direct current conversion), but the new energy power generation has the characteristics of randomness, volatility and intermittence (is considered to bring impact to the existing power system), and generally can be solved by adopting an energy storage system.
2. Different calling instructions are generated according to different reasons of fault generation, so that different countermeasures are adopted, faults in the running of the system are conveniently judged, the process of manually identifying the faults is omitted, and the working efficiency is improved.
3. The problem of system internal electric quantity faults is solved through the emergency support module, when the system internal electric quantity faults are less, the system internal is adjusted, the residual electric quantity of the energy storage system and the longest support time when the energy storage system is powered off are calculated, the power is distributed in an optimal mode under the condition of determining the longest support time, and the working stability of the network-structured energy storage system is improved to the greatest extent.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
fig. 1 is a block diagram of a grid-structured energy storage system according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
Example 1:
the present invention provides a grid-formation energy storage system, as shown in fig. 1, comprising:
a battery module: the system comprises a plurality of batteries and a plurality of battery management units, wherein the battery management units are used for collecting operation data of the batteries;
The energy storage management module: the battery management unit is connected with the battery module, acquires data of the battery management unit, establishes an energy storage model based on the battery operation data, and determines energy stored by the battery at a certain moment;
the energy storage control module: the energy storage management module is connected with the power storage management module, the stored energy is compared with the current electric energy demand according to the calculated energy, if the power generation is excessive, the electric energy is stored, and if the power generation is lack, the electric energy is released;
And a fault diagnosis module: the energy storage management module is connected with the power supply module, and is used for continuously monitoring the running process of the battery and the current transformer to obtain energy storage fault information;
Emergency support module: the fault diagnosis module is connected with the power emergency support module, and provides power emergency support based on the energy storage fault information to obtain power emergency support event information;
the energy storage analysis module: and the energy storage management module, the fault diagnosis module and the emergency support module are connected with each other, the occurrence reason of the operation fault of the current energy storage system is analyzed, and the electric energy emergency event support information and the battery operation state at the time of emergency support are recorded.
In this embodiment, the battery module includes n batteries connected in series and corresponding n battery management units, where n is an integer greater than 1.
In this embodiment, the working principle of the network-structured energy storage system is to obtain the operation data of the battery module, then manage and analyze the operation data, specifically determine the electric energy and power regulation strategy, monitor the faults occurring in the operation process, take an emergency treatment strategy when the faults occur, analyze the cause of the operation faults after the fault event is processed, and record the event.
The beneficial effects of the technical scheme are as follows: by determining the electric energy and power regulation strategy, faults occurring in the operation process are monitored, when faults occur, an emergency treatment strategy is adopted, the reasons of the operation faults are analyzed after the fault event treatment is completed, the event is recorded, and the self-checking and recovery of the system faults are realized.
Example 2:
The invention provides a net-structured energy storage system, an energy storage management module, comprising:
Parameter acquisition unit: the method comprises the steps of connecting with a battery module, acquiring operation data of the battery, and calculating a lower limit and an upper limit of charging power of an electric energy storage system, a lower limit and an upper limit of energy storage capacity of the energy storage system, a self-discharge coefficient, a charging efficiency coefficient and a discharging efficiency coefficient based on the battery operation data;
the energy storage model building unit: an energy storage model is built according to the lower limit and the upper limit of the charging power, the lower limit and the upper limit of the energy storage capacity, the self-discharge coefficient, the charging efficiency coefficient and the discharging efficiency coefficient of the energy storage system, and the following formula is adopted:
Wherein, E (k+1) represents the energy storage electric quantity which can be output at time k+1, E k,max represents the upper limit of the energy storage capacity of the energy storage system at time k, E k,min represents the lower limit of the energy storage capacity of the energy storage system at time k, T 1 represents the charging efficiency coefficient, T 2 represents the discharging efficiency coefficient, α represents the self-discharging coefficient, and the calculation of the charging state and the discharging state is both constrained by power P, wherein, the power constraint formula of the charging state is as follows: p min·T1≤P≤Pmax·T1, wherein P min represents a lower limit of the charging power, and P max represents an upper limit of the charging power; the power constraint formula of the discharge state is: p min·T2≤P≤Pmax·T2.
In the embodiment, the energy storage model formula of the energy storage model building unit constrains the model according to the charge and discharge states, and the energy storage energy which can be output at the time k+1 during charge and discharge is calculated respectively, so that the classification calculation is facilitated.
The beneficial effects of the technical scheme are as follows: the energy storage model is established to calculate the energy storage electric quantity, the model is constrained according to the charge and discharge state, and the energy storage electric quantity which can be output at the moment k+1 in charge and discharge is calculated respectively, so that the classification calculation is facilitated.
Example 3:
The invention provides a net-structured energy storage system, an energy storage control module, comprising:
A grid-structured converter control unit: the method is used for acquiring additional reference power of the power grid, potential virtual phase angles of the energy storage converter, internal potential amplitude values output by the converter and current inner loop reference values, and determining reference voltages under a three-phase coordinate system, so that the energy storage system is controlled.
A power acquisition unit: acquiring additional reference power based on the actual frequency of the power grid;
phase angle acquisition unit: acquiring an internal potential virtual phase angle output by the energy storage converter based on the additional reference power;
an internal potential amplitude acquisition unit: acquiring an internal potential amplitude value output by the energy storage converter based on the output end voltage and the output end current of the converter;
A current reference value calculation unit: calculating a current inner loop reference value based on the inner potential amplitude;
Voltage reference value calculation unit: determining a reference voltage in a three-phase stationary coordinate system based on the current inner loop reference value and an inner potential virtual phase angle;
an energy storage control unit: and controlling the energy storage system according to the trigger pulse output by the reference voltage based on the Pulse Width Modulation (PWM) generator.
In the embodiment, in a virtual frequency modulation control link, additional reference power is obtained based on the actual frequency of a power grid; in the virtual inertia and damping control link, acquiring an internal potential virtual phase angle output by the energy storage converter based on the additional reference power; in a virtual excitation control link, acquiring an internal potential amplitude value output by the energy storage converter based on the voltage of an output end and the current of the output end of the energy storage converter; calculating a current inner loop reference value based on the inner potential amplitude in a voltage outer loop virtual circuit control link; in a current inner loop control link, determining a reference voltage under a three-phase stationary coordinate system based on the current inner loop reference value and an inner potential virtual phase angle; and controlling the energy storage system based on the trigger pulse output by the PWM generator according to the reference voltage.
The beneficial effects of the technical scheme are as follows: the energy storage converter is equivalent to a controllable voltage source with synchronous generator output characteristics, reference voltage is obtained through virtual frequency modulation control, virtual inertia and damping control, virtual excitation control, voltage outer ring virtual circuit control and current inner ring control, and the reference voltage is output to the PWM generator, so that the energy storage system is controlled according to trigger pulses output by the reference voltage by the PWM generator, the advantage of the power throughput flexibility of the energy storage system can be better exerted, fluctuation of power generation output power of new energy sources such as wind power and photovoltaic is stabilized, voltage regulation, frequency modulation and inertia supporting service of new energy source grid connection is provided, the level of power grid consumption for new energy source power generation is improved, and development and utilization of new energy sources are promoted.
Example 4:
The invention provides a network-structured energy storage system, a fault diagnosis module, comprising:
and a detection unit: the system is connected with the energy storage management module and is used for setting a plurality of detection points in the system, detecting faults in the running process and generating a fault instruction;
diagnosis unit: and the detection unit is connected with the power supply unit and is used for receiving the fault instruction, comprehensively evaluating the battery state and generating energy storage fault early warning information.
In this embodiment, the fault diagnosis module is configured to detect a fault in an operation process, analyze and evaluate the fault, and obtain a problem existing in a current operation state.
In this embodiment, the diagnostic unit works on the principle of discovering potential defects inside the energy storage system in advance and evaluating the risk and potential power supply capability that may occur.
The beneficial effects of the technical scheme are as follows: by detecting faults in the operation process, analyzing and evaluating the faults to obtain problems existing in the current operation state, finding potential defects in the energy storage system, and evaluating possible risks and potential power supply capacity.
Example 5:
the invention provides a network-structured energy storage system, a diagnosis unit, comprising:
Fault analysis unit: the fault instruction is obtained, the energy storage fault information is analyzed, and the fault occurrence reasons are obtained, wherein the fault occurrence reasons comprise small electric quantity in the system and faults of internal circuits of the system;
A classification alarm unit: and generating first early warning information and second early warning information according to the fault cause, wherein the first early warning information comprises less electric quantity in the system, and the second early warning information comprises faults of internal circuits of the system.
In this embodiment, the operation principle of the fault diagnosis unit is that the cause of the fault is obtained after analyzing the fault instruction.
In the embodiment, the reasons for the faults include insufficient electric quantity in the system and faults of circuits in the system, and different calling instructions are generated according to the different reasons for the faults, so that different countermeasures are adopted, faults in the operation of the system are conveniently judged, the process of manually identifying the faults is omitted, and the working efficiency is improved.
The beneficial effects of the technical scheme are as follows: the failure generation reasons are obtained through failure analysis and classification alarm, and different calling instructions are generated according to the different failure generation reasons, so that different countermeasures are adopted, the failure in the system operation can be conveniently judged, the process of manually identifying the failure is omitted, and the working efficiency is improved.
Example 6:
the invention provides a net-structured energy storage system, an emergency support module, comprising:
a calculation unit: the system comprises a classification alarm unit, a first early warning information instruction and a second early warning information instruction, wherein the classification alarm unit is connected with the first early warning information instruction;
Configuration unit: the power supply device is connected with the calculation unit, calculates the longest support time when the energy storage system loses power according to the residual electric quantity of the energy storage system, adjusts a charge-discharge power curve, and configures optimal power distribution based on the longest support time;
Constraint unit: and constraining the voltage and the current of the power grid node according to the optimal power distribution, and ensuring that the voltage and the current are within a set threshold value.
In this embodiment, the emergency support module adjusts the system when a fault occurs in the system with less electric quantity, calculates the remaining electric quantity of the energy storage system and the longest support time when the energy storage system loses power, and distributes power in an optimal manner under the condition of determining the longest support time, thereby improving the working stability of the network-structured energy storage system to the maximum extent.
The beneficial effects of the technical scheme are as follows: and calculating the residual electric quantity of the energy storage system and the longest supporting time when the energy storage system loses electricity, distributing power in an optimal mode under the condition of determining the longest supporting time, improving the working stability of the network-structured energy storage system to the maximum extent, and limiting the voltage and the current to be within a set threshold value.
Example 7:
the invention provides a net-structured energy storage system, an emergency support module, which further comprises:
And a control unit: acquiring the second early warning instruction information, and controlling the disconnection of the branch circuit with the fault and the bus;
And a monitoring unit: and monitoring the voltage of the battery cluster in the cut-off branch, and controlling the rest branch to be cut off from the bus when the voltage of the battery cluster in the cut-off branch is reduced to a preset value.
In this embodiment, when an instruction of a fault of an internal circuit of the system is received, the voltage of the battery cluster in the cut-off branch is monitored, and when the voltage of the battery cluster in the cut-off branch is reduced to a preset value, the rest branch is controlled to be cut off from the bus.
The beneficial effects of the technical scheme are as follows: and according to the internal fault instruction, intelligently judging the circuit module with a problem, and controlling the voltage and the current to be normal.
Example 8:
the invention provides a net-structured energy storage system, an energy storage analysis module, comprising:
capacity analysis unit: analyzing the cause of the failure of the energy storage capacity of the current energy storage system, and determining the cause of the capacity reduction of the system;
event recording unit: and recording electric energy emergency supporting information, the running state of the battery at the moment when the emergency supporting time occurs and the reason for the capacity reduction of the system, and storing the electric energy emergency supporting information and the reason into an energy storage database of the system.
Example 9:
The invention provides a network-structured energy storage system, a capacity analysis unit, comprising:
Extraction unit: extracting voltage values, temperature values and capacity values of each battery monomer in the energy storage system in the same charging period and the same discharging period of the preset number, and generating a voltage history curve, a temperature history curve and a capacity history curve of the energy storage system;
And a comparison unit: comparing voltage history curves, temperature history curves or capacity history curves of different battery monomers in the same charging period or the same discharging period, and determining the battery monomers causing the capacity reduction of the system;
a judging unit: judging whether the voltage history curves of the battery cells to be replaced in different charging periods or discharging periods are the same or not; if the initial capacity of the battery monomer to be replaced is small; if the battery cells to be replaced are different, the battery capacity is reduced due to excessive consumption.
In this embodiment, before the step of recording the voltage value, the temperature value and the capacity value of each battery cell of the lithium battery energy storage system in the operation process and storing the voltage value, the temperature value and the capacity value in the database, the equalization function of the energy storage system needs to be started, so that after one battery cell in the energy storage system reaches the cut-off voltage, the energy storage system continues to charge or discharge.
In the embodiment, the battery cells with inconsistent performances are removed through the voltage history curve, the temperature history curve or the capacity history curve, so that the failed battery can be rapidly positioned, and the problem of capacity reduction caused by inconsistent performances of the battery cells in the energy storage system is avoided.
The beneficial effects of the technical scheme are as follows: the method comprises the steps of acquiring data of a battery management unit, establishing an energy storage model based on the battery operation data, and determining the energy stored by the battery at a certain moment; continuously monitoring the battery operation process to obtain energy storage fault information; providing electric energy emergency support based on the energy storage fault information to obtain electric energy emergency support event information; the method comprises the steps of analyzing the occurrence reason of the operation fault of the current energy storage system, recording the emergency supporting information of the electric energy and the operation state of the battery at the moment when the emergency supporting occurs, and solving the problems that the fault cannot be responded in time and the existing fault cannot be judged according to the past experience.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (2)
1. A networked energy storage system, the system comprising:
a battery module: the system comprises a plurality of batteries and a plurality of battery management units, wherein the battery management units are used for collecting operation data of the batteries;
The energy storage management module: the battery management unit is connected with the battery module, acquires data of the battery management unit, establishes an energy storage model based on the battery operation data, and determines energy stored by the battery at a certain moment;
the energy storage control module: the energy storage management module is connected with the power storage management module, the stored energy is compared with the current electric energy demand according to the calculated energy, if the power generation is excessive, the electric energy is stored, and if the power generation is lack, the electric energy is released;
And a fault diagnosis module: the energy storage management module is connected with the power supply module, and is used for continuously monitoring the running process of the battery and the current transformer to obtain energy storage fault information;
Emergency support module: the fault diagnosis module is connected with the power emergency support module, and provides power emergency support based on the energy storage fault information to obtain power emergency support event information;
The energy storage analysis module: the system comprises an energy storage management module, a fault diagnosis module, an emergency support module, a power emergency event support module, a fault diagnosis module and a power emergency event support module, wherein the energy storage management module, the fault diagnosis module and the emergency support module are connected with each other;
a grid-tied converter control unit comprising:
a power acquisition unit: acquiring additional reference power based on the actual frequency of the power grid;
phase angle acquisition unit: acquiring an internal potential virtual phase angle output by the energy storage converter based on the additional reference power;
an internal potential amplitude acquisition unit: acquiring an internal potential amplitude value output by the energy storage converter based on the output end voltage and the output end current of the converter;
A current reference value calculation unit: calculating a current inner loop reference value based on the inner potential amplitude;
Voltage reference value calculation unit: determining a reference voltage in a three-phase stationary coordinate system based on the current inner loop reference value and an inner potential virtual phase angle;
an energy storage control unit: controlling an energy storage system based on a trigger pulse output by a Pulse Width Modulation (PWM) generator according to the reference voltage;
A fault diagnosis module comprising:
and a detection unit: the system is connected with the energy storage management module and is used for setting a plurality of detection points in the system, detecting faults in the running process and generating a fault instruction;
diagnosis unit: the detection unit is connected with the power supply unit and is used for receiving the fault instruction, comprehensively evaluating the battery state and generating energy storage fault early warning information;
the diagnostic unit includes:
Fault analysis unit: the fault instruction is obtained, the energy storage fault information is analyzed, and the fault occurrence reasons are obtained, wherein the fault occurrence reasons comprise small electric quantity in the system and faults of internal circuits of the system;
A classification alarm unit: generating first early warning information and second early warning information according to the fault occurrence cause, wherein the first early warning information comprises less electric quantity in a system, and the second early warning information comprises a fault of an internal circuit of the system;
an emergency support module comprising:
a calculation unit: the system comprises a classification alarm unit, a first early warning information instruction and a second early warning information instruction, wherein the classification alarm unit is connected with the first early warning information instruction;
Configuration unit: the power supply device is connected with the calculation unit, calculates the longest support time when the energy storage system loses power according to the residual electric quantity of the energy storage system, adjusts a charge-discharge power curve, and configures optimal power distribution based on the longest support time;
constraint unit: constraining the voltage and the current of the power grid node according to the optimal power distribution, and ensuring that the voltage and the current are within a set threshold value;
the emergency support module further comprises:
and a control unit: acquiring the second early warning information instruction, and controlling the disconnection of the branch circuit with the fault and the bus;
And a monitoring unit: monitoring the voltage of the battery cluster in the cut-off branch, and controlling the rest branch and the bus to be cut off when the voltage of the battery cluster in the cut-off branch is reduced to a preset value;
an energy storage analysis module, comprising:
capacity analysis unit: analyzing the cause of the failure of the energy storage capacity of the current energy storage system, and determining the cause of the capacity reduction of the system;
event recording unit: recording electric energy emergency supporting information, a battery running state at the moment when the emergency supporting time occurs and a system capacity reduction reason, and storing the electric energy emergency supporting information and the battery running state and the system capacity reduction reason into an energy storage database of a system;
A capacity analysis unit comprising:
Extraction unit: extracting voltage values, temperature values and capacity values of each battery monomer in the energy storage system in the same charging period and the same discharging period of the preset number, and generating a voltage history curve, a temperature history curve and a capacity history curve of the energy storage system;
And a comparison unit: comparing voltage history curves, temperature history curves or capacity history curves of different battery monomers in the same charging period or the same discharging period, and determining the battery monomers causing the capacity reduction of the system;
A judging unit: judging whether voltage history curves of different charging periods or discharging periods of the battery monomer to be replaced are the same or not; if the initial capacity of the battery monomer to be replaced is small; if the battery cells to be replaced are different, the battery capacity is reduced due to excessive consumption.
2. The grid-formation energy storage system of claim 1, wherein the energy storage control module comprises:
A grid-structured converter control unit: the method is used for acquiring additional reference power of the power grid, potential virtual phase angles of the energy storage converter, internal potential amplitude values output by the converter and current inner loop reference values, and determining reference voltages under a three-phase coordinate system, so that the energy storage system is controlled.
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| CN112732443A (en) * | 2021-01-12 | 2021-04-30 | 徐州普罗顿氢能储能产业研究院有限公司 | Energy storage power station state evaluation and operation optimization system based on edge calculation |
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| CN112732443A (en) * | 2021-01-12 | 2021-04-30 | 徐州普罗顿氢能储能产业研究院有限公司 | Energy storage power station state evaluation and operation optimization system based on edge calculation |
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