CN115483734B - Elevator energy storage control device and method - Google Patents

Abstract

The invention discloses an elevator energy storage control device and method, wherein the device comprises: elevator energy storage heap, first current sensor, second current sensor, treater to and voltage sensor, elevator energy storage heap includes: the device comprises a contactor, a motor converter, a bidirectional energy storage converter and an energy storage stack; the first current sensor is connected in series between the rectifier and the motor converter so as to collect first current between the rectifier and the motor converter; the second current sensor is arranged between the bidirectional energy storage converter and the energy storage pile to collect second current of the energy storage pile; the voltage sensor is arranged between the bidirectional energy storage converter and the energy storage pile to collect the voltage of the energy storage pile; the processor is used for determining the working state of the elevator energy storage pile according to the energy storage capacity of the energy storage pile, the running time of the elevator energy storage pile, pre-acquired electricity price information, the first current, the second current, the opening and closing states and the voltages of the contactors; and controlling the operation mode of the energy storage stack according to the working state.

Description

Elevator energy storage control device and method

Technical Field

The present invention relates to the technical field of elevator energy storage, and in particular to an elevator energy storage control device and method.

Background Art

Adding an energy storage stack to the driving link of the elevator can achieve energy saving of the elevator to a certain extent. However, due to the complex working state of the elevator energy storage device (the elevator has states such as ascending, descending and waiting), and the changing load conditions of the car, the state of charge (State Of Charge, referred to as SOC) of the energy storage stack changes dynamically with the change of working time. The complex working conditions make it difficult to determine the working state of the elevator energy storage device.

At present, the research on adding energy storage stacks to elevators only focuses on the energy storage stacks of a single elevator. In fact, with the trend of large-scale and high-rise buildings, multiple elevators in a building is the mainstream trend. If each elevator is equipped with an energy storage stack, it is obviously unable to adapt to the development and progress of the times.

Summary of the invention

Therefore, in order to solve the deficiencies of the prior art, an embodiment of the present invention provides an elevator energy storage control device and method.

According to a first aspect, an embodiment of the present invention discloses an elevator energy storage control device, including an elevator energy storage device, a first current sensor, a second current sensor, a processor, and a voltage sensor, wherein the elevator energy storage device includes: a contactor, a rectifier, a DC bus, a motor converter, a bidirectional energy storage converter, and an energy storage stack;

The first current sensor is connected in series between the positive electrode of the rectifier and the positive electrode of the motor converter through the DC bus, so as to collect a first current between the rectifier and the motor converter;

The second current sensor is connected in series between the bidirectional energy storage converter and the energy storage stack, and is used to collect a second current between the energy storage stack and the bidirectional energy storage converter;

The voltage sensor is connected in parallel between the bidirectional energy storage converter and the energy storage stack, and is used to collect the voltage of the energy storage stack;

The processor is used to determine the working state of the elevator energy storage device according to the storage energy of the energy storage stack, the operating time of the elevator energy storage device, the pre-acquired electricity price information, the first current, the second current, the opening and closing state of the contactor, and the voltage; and control the operating mode of the elevator energy storage device according to the working state.

Optionally, when the elevator energy storage device is connected to at least two elevators, the elevator energy storage device includes at least two motor converters and a line collection device, and the motor converters are connected to the elevators in a one-to-one correspondence.

The first positive terminal of the line collection device is connected to the positive electrode of the motor converter, and the second positive terminal is connected to the positive electrode of the rectifier and the positive electrode of the bidirectional energy storage converter;

The first negative terminal of the line collection device is connected to the negative pole of the motor converter, and the second negative terminal is connected to the negative pole of the rectifier and the negative pole of the bidirectional energy storage converter.

Optionally, the processor is specifically configured to:

Determining a state of charge of the energy storage stack according to the storage energy of the energy storage stack, the operating time, the voltage, and the second current;

The working state of the elevator energy storage device is determined according to the electricity price information, the first current, the opening and closing state of the contactor, and the charge state, so as to determine the operation mode of the elevator energy storage device according to the working state.

Optionally, the processor is used to determine the state of charge according to the following formula:

Among them, SOC is the state of charge, _Qc is the energy storage, T is the operating time, ise2 is the second current output value of the second current sensor, and the value of T is determined by the time when the critical value of the voltage is located.

Optionally, the processor is specifically configured to:

If the electricity price information is in the first preset electricity price stage, and the state of charge is less than the first preset state of charge, the elevator energy storage device is in the first working state;

If the electricity price information is in the second preset electricity price stage, and the state of charge is less than the second preset state of charge, the elevator energy storage device is in the second working state, and the first preset electricity price stage is greater than the second preset electricity price stage;

If the first current is less than a preset threshold value, and the state of charge is less than a first preset state of charge, the elevator energy storage device is in a third working state;

If the first current is greater than a preset threshold, the contactor is disconnected, and the state of charge is greater than a third preset state of charge, the elevator energy storage device is in a fourth working state;

If the first current is less than a preset threshold value, and the state of charge is greater than or equal to a first preset state of charge, the elevator energy storage device is in a fifth working state, wherein the first preset state of charge is greater than the second preset state of charge is greater than the third preset state of charge;

If the working state does not belong to the first working state, the second working state, the third working state, the fourth working state and the fifth working state, the elevator energy storage device is in a sixth working state.

Optionally, the elevator energy storage device further includes an energy consumption device, and the processor is further specifically used for:

If the elevator energy storage device is in the first working state, the contactor is closed, and voltage is provided to the motor converter and the energy storage stack respectively through a preset power supply device;

If the elevator energy storage device is in the second working state, the contactor is closed, and voltage is provided to the motor converter and the energy storage stack respectively through the power supply device;

If the elevator energy storage device is in the third working state, the motor converter provides voltage to the energy storage stack through the voltage generated during the operation of the elevator;

If the elevator energy storage device is in the fourth working state, the energy storage stack provides voltage to the motor converter;

If the elevator energy storage device is in the fifth working state, the motor converter provides voltage to the energy consumption device through the voltage generated by the elevator during operation;

If the elevator energy storage device is in the sixth working state, the contactor is closed and the power supply device provides voltage to the motor inverter.

According to the second aspect, an embodiment of the present invention further discloses an elevator energy storage control method, which is applied to the elevator energy storage control device of the first aspect or any optional implementation manner of the first aspect, and the method includes:

Acquire a first current between the rectifier and the motor converter, a second current between the energy storage stack and the bidirectional energy storage converter, and a voltage;

Determine the working state of the elevator energy storage device according to the first current, the second current, the voltage, the storage energy of the energy storage stack, the operating time of the elevator energy storage device, the pre-acquired electricity price information, and the opening and closing state of the contactor;

According to the working state, the operation mode of the elevator energy storage device is controlled.

Optionally, determining the working state of the elevator energy storage device according to the first current, the second current, the voltage, the storage energy of the energy storage stack, the operating time of the elevator energy storage device, the pre-acquired electricity price information, and the opening and closing state of the contactor specifically includes:

Determining the charge state of the energy storage stack according to the storage energy, operating time, voltage and second current of the energy storage stack;

The working state of the elevator energy storage device is determined according to the electricity price information, the first current and the state of charge, so as to determine the operation mode of the elevator energy storage device according to the working state.

Optionally, determining the working state of the elevator energy storage device according to the electricity price information, the first current and the state of charge, so as to determine the operation mode of the elevator energy storage device according to the working state, specifically includes:

If the electricity price information is in the first preset electricity price stage, and the state of charge is less than the first preset state of charge, the elevator energy storage device is in the first working state;

If the electricity price information is in the second preset electricity price stage, and the state of charge is less than the second preset state of charge, the elevator energy storage device is in the second working state, and the first preset electricity price stage is greater than the second preset electricity price stage;

If the first current is less than the preset threshold value, and the state of charge is less than the first preset state of charge, the elevator energy storage device is in the third working state;

If the first current is greater than the preset threshold, the contactor is disconnected, and the state of charge is greater than the third preset state of charge, the elevator energy storage device is in the fourth working state;

If the first current is less than the preset threshold value, and the state of charge is greater than or equal to the first preset state of charge, the elevator energy storage device is in the fifth working state, wherein the first preset state of charge is greater than the second preset state of charge is greater than the third preset state of charge;

If the working state does not belong to the first working state, the second working state, the third working state, the fourth working state and the fifth working state, the elevator energy storage device is in the sixth working state.

Optionally, according to the working state, the operation mode of the elevator energy storage device is controlled, specifically including:

If the elevator energy storage device is in the first working state, the contactor is closed, and voltage is provided to the motor converter and the energy storage stack respectively through the preset power supply device;

If the elevator energy storage device is in the second working state, the contactor is closed, and voltage is provided to the motor converter and the energy storage stack respectively through the power supply device;

If the elevator energy storage device is in the third working state, the motor converter provides voltage to the energy storage stack through the voltage generated during the operation of the elevator;

If the elevator energy storage device is in the fourth working state, the energy storage stack provides voltage to the motor converter;

If the elevator energy storage device is in the fifth working state, the motor converter provides voltage to the energy consumption device through the voltage generated during the operation of the elevator;

If the elevator energy storage device is in the sixth working state, the contactor is closed and the power supply device provides voltage to the motor converter.

The technical solution of the present invention has the following advantages:

The elevator energy storage control device and method provided by the present invention, the first current sensor is connected in series between the rectifier and the motor converter through the DC bus, and the direction of the first current flowing through the motor converter can be measured in real time, and the working state of the motor converter can be judged in real time according to the direction of the first current; the second current sensor is connected in series between the bidirectional energy storage converter and the energy storage stack, and the second current of the energy storage stack can be collected in real time. The voltage sensor is installed in the bidirectional energy storage converter and the energy storage stack, and the voltage of the energy storage stack can be collected in real time; further, the processor can determine the working state of the energy storage stack according to the storage energy of the energy storage stack, the operating time of the elevator energy storage device, the pre-acquired electricity price information, the first current, the second current, the opening and closing state of the contactor, and the voltage; finally, the processor controls the operation mode of the energy storage stack according to the working state of the energy storage stack to achieve precise control of the energy storage stack, thereby reducing the difficulty of controlling the energy storage stack and minimizing energy consumption.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram of a specific example of an elevator energy storage control device in an embodiment of the present invention;

FIG2 is a schematic diagram of a specific example of an elevator energy storage control device in an embodiment of the present invention;

FIG3 is a schematic diagram of a specific example of an elevator energy storage control device in an embodiment of the present invention;

FIG4 is a schematic diagram of a specific example of an elevator energy storage control device according to an embodiment of the present invention;

FIG5 is a schematic diagram of a specific example of an elevator energy storage control device in an embodiment of the present invention;

FIG6 is a schematic diagram of a specific example of an elevator energy storage control device according to an embodiment of the present invention;

FIG7 is a schematic diagram of a specific example of an elevator energy storage control device according to an embodiment of the present invention;

FIG8 is a schematic diagram of a specific example of an elevator energy storage control device according to an embodiment of the present invention;

FIG. 9 is a flow chart of a specific example of an elevator energy storage control method according to an embodiment of the present invention.

DETAILED DESCRIPTION

The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

In response to the technical problems mentioned in the background technology, an embodiment of the present application provides an elevator energy storage control device, specifically referring to Figure 1, the device includes an elevator energy storage device, a first current sensor 101, a second current sensor 102, a processor, and a voltage sensor 103. The elevator energy storage device includes: a contactor 1011, a motor inverter 1012, a bidirectional energy storage inverter 1013, an energy storage stack 1014, a rectifier 1015 and a DC bus 1016.

The first current sensor 101 is connected in series between the rectifier 1015 and the motor converter 1012 via the DC bus 1016 , so as to collect a first current between the rectifier 1015 and the motor converter 1012 .

The second current sensor 102 is installed between the bidirectional energy storage converter 1013 and the energy storage stack 1014 to collect a second current between the energy storage stack 1014 and the bidirectional energy storage converter 1013 .

The voltage sensor 103 is installed between the bidirectional energy storage converter 1013 and the energy storage stack 1014 and is used to collect the voltage of the energy storage stack 1014 .

The processor is used to determine the working state of the elevator energy storage device according to the storage energy of the energy storage stack 1014, the operating time of the elevator energy storage device, the pre-acquired electricity price information, the first current, the second current, the opening and closing state of the contactor 1011, and the voltage; and control the operating mode of the elevator energy storage device according to the working state.

For example, FIG1 is a schematic diagram of an actual circuit in a specific embodiment of the present application.

Among them, the elevator energy storage device is connected to the elevator's traction machine and a preset power supply (three-phase power grid). Due to the variability of the elevator's operating mode, the existing elevator energy storage device is complicated and difficult to judge the working mode when performing real-time control of the elevator energy storage device. To solve this problem, the present application first sets a first current sensor 101 on the basis of the existing elevator energy storage device, which is used to collect the first current of the motor inverter 1012, wherein the positive and negative of the first current can indicate the direction of the current flowing through the motor inverter 1012.

When the current direction of the first current is from the direction of the rectifier 1015 to the motor inverter 1012, the preset power supply device supplies power to the motor inverter 1012, that is, the traction machine connected to the motor inverter 1012 is in a state of needing electricity (it can be the elevator rising state); when the current direction of the first current is from the motor inverter 1012 to the direction of the rectifier 1015, the traction machine connected to the motor inverter 1012 is in a state of generating electricity (the elevator accelerates to descend).

When controlling the operation mode of the elevator energy storage device, it is also necessary to control the operation according to the energy storage situation of the energy storage stack 1014 in the elevator energy storage device, wherein the energy storage situation is determined by the charge state of the energy storage stack 1014, and the charge state is determined according to the second current collected by the second current sensor 102 and the voltage of the energy storage stack 1014 collected by the voltage sensor 103. As shown in FIG2 , it is a charging change curve of the energy storage stack 1014, wherein the horizontal axis is time, the left vertical axis is the voltage axis and the current axis, and the right vertical axis is the SOC axis. SOC is used to indicate the charge state of the energy storage stack 1014, and 100% indicates that the energy storage stack 1014 is fully charged.

Curve ① in Figure 2 is a voltage curve, which can be obtained through the output of the voltage sensor 103; ② is a variation curve of the second current, which can be obtained through the output of the second current sensor 102; ③ is an SOC curve. According to Figure 2, when the energy storage stack 1014 is charged with the charging current IB, the voltage and SOC value of the energy storage stack 1014 increase accordingly, and vice versa. In order to protect the normal operation of the energy storage stack 1014, three SOC thresholds SOCmax, SOCref and SOCmin are set during operation. SOCmax is the maximum charging capacity (state of charge) of the energy storage stack 1014, and can be set to a maximum of 100% according to the actual usage scenario. SOCmin is the minimum retention capacity of the battery stack, which is usually set to 20%. SOCref is a critical value between SOCmax and SOCmin. The specific numerical value can be set by technicians in this field according to actual conditions.

The voltage curve ① has three stages in total. The corresponding time point when it is at the critical point between the second stage and the third stage is the maximum value corresponding to the SOC.

In an optional embodiment, the SOC can be calculated by the following formula:

In the formula, SOC is the state of charge, Q _c is the storage energy of the energy storage stack 1014 , T is the operating time of the energy storage stack 1014 , and ise2 is the second current output value of the second current sensor 102 .

According to the time when the voltage reaches the critical point and the above formula, the maximum state of charge (SOCmax) of the energy storage stack 1014 is obtained.

After obtaining the first current, the second current and the voltage, the processor determines the working state of the elevator energy storage device according to the obtained data. When the charge state of the energy storage stack 1014 is insufficient, the energy storage stack 1014 needs to be charged, which generates additional electricity charges in addition to normal elevator operation. Therefore, when judging the working state of the elevator energy storage device, the real-time electricity price is introduced for judgment.

In an optional embodiment, the method for determining the working state of the elevator energy storage device may be to determine the working state of the elevator energy storage device according to electricity price information, the first current, the opening and closing state of the contactor 1011, and the charge state.

Exemplarily, it can be determined based on the opening and closing state of the contactor 1011 whether the elevator energy storage device is powered by a preset power source (grid).

If the electricity price information is in the first preset electricity price stage and the state of charge is less than the first preset state of charge, the elevator energy storage device is in the first working state.

Exemplarily, the first preset electricity price stage may be a valley electricity price, that is, the electricity price at this time is low, and the energy in the energy storage stack 1014 is insufficient, so it is more appropriate to supply power to the energy storage stack 1014 through the grid. The first preset state of charge is SOCmax.

For the first working state, the corresponding operation mode of the elevator energy storage device is: closing the contactor 1011, and providing voltage to the motor inverter 1012 and the energy storage stack 1014 respectively through a preset power supply device.

For example, in a specific example, as shown in FIG3 , a schematic diagram of an elevator energy storage device in a first working state is shown, in which the contactor 1011 is turned on, and the three-phase alternating current of the power grid is sent to the rectifier unit 1015, and the rectifier unit 1015 rectifies the three-phase alternating current into direct current, and provides direct current for the DC bus 1016. It can be seen in FIG3 that in the first working state, the bidirectional energy storage converter 1013 obtains energy from the DC bus 1016 and injects energy into the energy storage stack 1014. It can be further seen that the direction of the current flowing through the second current sensor 102 is from the bidirectional energy storage converter 1013 to the energy storage stack 1014.

If the electricity price information is in the second preset electricity price stage and the state of charge is less than the second preset state of charge, the elevator energy storage device is in the second working state.

Among them, the first preset electricity price stage is greater than the second preset electricity price stage.

For example, the second preset electricity price stage is the peak electricity price, and the second preset state of charge is SOCref, that is, SOC＜SOCref, at this time, the electricity price is at a high price stage, and the energy storage stack 1014 has insufficient energy. Although the electricity price is expensive at this time, due to the insufficient energy of the energy storage stack 1014, the power grid needs to supply power to the elevator traction machine through the electrode converter, and supply power to the energy storage stack 1014 at the same time.

For the second working state, the corresponding operation mode of the elevator energy storage device is: closing the contactor 1011, and providing voltage to the motor inverter 1012 and the energy storage stack 1014 respectively through the power supply equipment.

Exemplarily, as shown in FIG4 , which is a schematic diagram of the elevator energy storage device in the second working state, the contactor 1011 is turned on, and the three-phase AC power of the power grid is sent to the rectifier unit 1015. The rectifier unit 1015 rectifies the three-phase AC power into DC power, provides DC power to the DC bus 1016, and further provides voltage to the motor inverter 1012, and injects energy into the bidirectional energy storage inverter 1013 and the energy storage stack 1014.

If the first current is less than the preset threshold value and the state of charge is less than the first preset state of charge, the elevator energy storage device is in the third working state.

Exemplarily, the preset threshold value can be 0, and the first preset state of charge is SOCmax. When the first current is less than zero and flows from the direction of the motor inverter 1012 into the contactor 1011, the motor inverter 1012 generates current, and the elevator is in an accelerated descent state, which can generate a certain amount of energy. At this time, the energy storage stack 1014 is insufficient in energy, and electrical energy is generated for the elevator and energy is injected into the energy storage stack 1014.

For the third working state, the motor inverter 1012 provides voltage to the energy storage stack 1014 through the voltage generated during the operation of the elevator.

For example, as shown in FIG5 , it is a schematic diagram of an elevator energy storage device in a third working state, in which the motor converter 1012 is in a power generation mode, and the electric energy DC bus 1016 generated by the motor converter 1012 provides voltage, and further injects energy into the energy storage stack through the bidirectional energy storage converter 1013. As can be seen from FIG5 , in the fourth working state, the current flowing through the first current sensor 101 flows from the motor converter 1012 to the DC bus 1016, and the current flowing through the second current sensor 102 flows from the bidirectional energy storage converter 1013 to the energy storage stack 1014.

If the first current is greater than the preset threshold, the contactor 1011 is disconnected, and the state of charge is greater than the third preset state of charge, the elevator energy storage device is in the fourth working state.

Exemplarily, when the first current is greater than 0, and the contactor 1011 is disconnected, SOC>SOCmin, it means that the power grid is not supplying power at this time, and the energy storage stack 1014 supplies power to the motor converter 1012 .

In the fourth working state, the energy storage stack 1014 provides voltage to the motor inverter 1012 .

For example, as shown in FIG6 , a schematic diagram of an elevator energy storage device in a fourth working state is shown. The energy storage stack 1014 provides voltage to the DC bus 1016 through the bidirectional energy storage converter 1013, and further provides voltage to the motor converter 1012. As can be seen from FIG6 , in the fourth working state, the current in the first current sensor 101 flows from the DC bus 1016 to the motor converter 1012, and the current in the second current sensor 102 flows from the energy storage stack 1014 to the bidirectional energy storage converter 1013.

If the first current is less than the preset threshold value and the state of charge is greater than or equal to the first preset state of charge, the elevator energy storage device is in the fifth working state, wherein the first preset state of charge is greater than the second preset state of charge which is greater than the third preset state of charge.

Exemplarily, when the first current is less than 0, SOC≥SOCmax, the energy of the energy storage stack 1014 is sufficient, and the current generated by the motor inverter 1012 is no longer used to inject energy into the energy storage stack 1014 .

Therefore, for the fifth working state, the motor inverter 1012 provides voltage to the energy consuming equipment through the voltage generated during the operation of the elevator.

Exemplarily, the energy consumption equipment is a brake component in an elevator during the elevator descent process. FIG7 is a schematic diagram of the elevator energy storage device in the fifth working state. The motor inverter 1012 is in the power generation mode. The electric energy generated by the motor inverter 1012 provides voltage for the DC bus 1016. It can be seen that at this time, the switch K in the energy consumption unit is turned on and the brake resistor R consumes the excess energy generated by the motor inverter 1012.

If the working state does not belong to the first working state, the second working state, the third working state, the fourth working state and the fifth working state, the elevator energy storage device is in the sixth working state.

For the sixth working state, as shown in FIG8 , the elevator energy storage device is in the sixth working state schematic diagram, the contactor 1011 unit is turned on, and the three-phase AC power of the power grid is sent to the rectifier unit 1015, and the rectifier unit 1015 rectifies the three-phase AC power into DC power, and provides DC power to the DC bus 1016. Further, the DC power provides voltage to the motor converter 1012. It can be seen from FIG8 that in the sixth working state, the current flowing through the first current sensor 101 flows from the DC bus 1016 to the motor converter 1012.

On the basis of the above-mentioned embodiments, the embodiments of the present invention further provide another elevator energy storage control device. In this embodiment, the contents already introduced in the above-mentioned embodiments will not be repeated. In the above-mentioned embodiments, an elevator energy storage control device when there is only one elevator is introduced. Considering that there are multiple elevators in a building or a unit, it is necessary to control multiple elevators at the same time. Therefore, the elevator energy storage device needs to include at least two motor inverters 1012 and a line collection device 1018. The motor inverter 1012 is connected to the elevator in a one-to-one correspondence. The first positive terminal of the line collection device 1018 is connected to the positive pole of the motor inverter 1012, and the second positive terminal is connected to the positive pole of the rectifier 1015 and the positive pole of the bidirectional energy storage inverter 1013; the first negative terminal of the line collection device 1018 is connected to the negative pole of the motor inverter 1012, and the second negative terminal is connected to the negative pole of the rectifier 1015 and the negative pole of the bidirectional energy storage inverter 1013.

Exemplarily, as shown in Figures 3 to 8, each includes n traction machines, that is, n elevators, and n motor inverters 1012. Each traction machine corresponds to a motor inverter 1012, wherein the n motor inverters 1012 are connected to the DC bus 1016 through a line collection device 1018 (positive pole P1, ..., Pn, negative pole N1, ..., Nn), wherein P1, ..., Pn are respectively connected to the positive poles of 1-n motor inverters 1012, and N1, ..., Nn are respectively connected to the negative poles of the motor inverters 1012. Through such a connection method, the n elevators are integrated to achieve simultaneous control of multiple elevators.

By executing this device, the first current sensor is connected in series between the rectifier and the motor converter through the DC bus, and the direction of the first current flowing through the motor converter can be measured in real time, and the working state of the motor converter can be judged in real time according to the direction of the first current; the second current sensor is connected in series between the bidirectional energy storage converter and the energy storage stack, and the second current of the energy storage stack can be collected in real time. The voltage sensor is installed in the bidirectional energy storage converter and the energy storage stack, and the voltage of the energy storage stack can be collected in real time; further, the processor can determine the working state of the energy storage stack according to the energy storage of the energy storage stack, the running time of the elevator energy storage device, the pre-acquired electricity price information, the first current, the second current, the opening and closing state of the contactor, and the voltage; finally, the processor controls the operation mode of the energy storage stack according to the working state of the energy storage stack to achieve precise control of the energy storage stack, thereby reducing the difficulty of controlling the energy storage stack and minimizing energy consumption.

The above are embodiments of the elevator energy storage control device provided in the present application. Other embodiments of the elevator energy storage control device provided in the present application are described below. Please refer to the following for details.

The embodiment of the present invention further discloses an elevator energy storage control method, as shown in FIG9 , the method comprising:

Step 901, obtaining a first current between the rectifier and the motor converter, a second current between the energy storage stack and the bidirectional energy storage converter, and a voltage;

Step 902, determining the working state of the elevator energy storage device according to the first current, the second current, the voltage, the storage energy of the energy storage stack, the operating time of the elevator energy storage device, the pre-acquired electricity price information, and the opening and closing state of the contactor;

Step 903, controlling the operation mode of the energy storage stack according to the working status.

Obtaining a first current between the contactor and the motor converter, a second current of the energy storage stack, and a voltage;

Determine the working state of the elevator energy storage device according to the first current, the second current, the voltage, the storage energy of the energy storage stack, the operating time of the elevator energy storage device, the pre-acquired electricity price information, and the opening and closing state of the contactor;

According to the working status, the operation mode of the elevator energy storage device is controlled.

Optionally, determining the working state of the elevator energy storage device according to the first current, the second current, the voltage, the storage energy of the energy storage stack, the operating time of the elevator energy storage device, the pre-acquired electricity price information, and the opening and closing state of the contactor specifically includes:

Determining the charge state of the energy storage stack according to the storage energy, operating time, voltage and second current of the energy storage stack;

The working state of the elevator energy storage device is determined according to the electricity price information, the first current and the state of charge, so as to determine the operation mode of the elevator energy storage device according to the working state.

Optionally, determining the working state of the elevator energy storage device according to the electricity price information, the first current and the state of charge, so as to determine the operation mode of the elevator energy storage device according to the working state, specifically includes:

If the electricity price information is in the first preset electricity price stage, and the state of charge is less than the first preset state of charge, the elevator energy storage device is in the first working state;

If the electricity price information is in the second preset electricity price stage, and the state of charge is less than the second preset state of charge, the elevator energy storage device is in the second working state, and the first preset electricity price stage is greater than the second preset electricity price stage;

If the first current is less than the preset threshold value and the state of charge is less than the first preset state of charge, the elevator energy storage device is in the third working state;

If the first current is greater than the preset threshold, the contactor is disconnected, and the state of charge is greater than the third preset state of charge, the elevator energy storage device is in the fourth working state;

If the first current is less than the preset threshold value, and the state of charge is greater than or equal to the first preset state of charge, the elevator energy storage device is in the fifth working state, wherein the first preset state of charge is greater than the second preset state of charge is greater than the third preset state of charge;

If the working state does not belong to the first working state, the second working state, the third working state, the fourth working state and the fifth working state, the elevator energy storage device is in the sixth working state.

Optionally, according to the working state, the operation mode of the elevator energy storage device is controlled, specifically including:

If the elevator energy storage device is in the first working state, the contactor is closed, and voltage is provided to the motor converter and the energy storage stack respectively through the preset power supply device;

If the elevator energy storage device is in the second working state, the contactor is closed, and voltage is provided to the motor converter and the energy storage stack respectively through the power supply device;

If the elevator energy storage device is in the third working state, the motor converter provides voltage to the energy storage stack through the voltage generated during the operation of the elevator;

If the elevator energy storage device is in the fourth working state, the energy storage stack provides voltage to the motor converter;

If the elevator energy storage device is in the fifth working state, the motor converter provides voltage to the energy consumption device through the voltage generated during the operation of the elevator;

If the elevator energy storage device is in the sixth working state, the contactor is closed and the power supply device provides voltage to the motor converter.

The execution method of each step in the elevator energy storage control method provided by the embodiment of the present invention has been described in detail in any of the above method embodiments, so it will not be repeated here.

In this way, the first current sensor is connected in series between the rectifier and the motor converter through the DC bus, and the direction of the first current flowing through the motor converter can be measured in real time, and the working state of the motor converter can be judged in real time according to the direction of the first current; the second current sensor is connected in series between the bidirectional energy storage converter and the energy storage stack, and the second current of the energy storage stack can be collected in real time. The voltage sensor is installed in the bidirectional energy storage converter and the energy storage stack, and the voltage of the energy storage stack can be collected in real time; further, the processor can determine the working state of the energy storage stack according to the energy storage of the energy storage stack, the operating time of the elevator energy storage device, the pre-acquired electricity price information, the first current, the second current, the opening and closing state of the contactor, and the voltage; finally, the processor controls the operation mode of the energy storage stack according to the working state of the energy storage stack to achieve precise control of the energy storage stack, thereby reducing the difficulty of controlling the energy storage stack and minimizing energy consumption.

Claims (2)

1. An elevator energy storage control device, characterized in that it includes an elevator energy storage device, a first current sensor, a second current sensor, a processor, and a voltage sensor, wherein the elevator energy storage device includes: a contactor, a rectifier, a DC bus, a motor converter, a bidirectional energy storage converter, and an energy storage stack; The first current sensor is connected in series between the positive electrode of the rectifier and the positive electrode of the motor converter through the DC bus, so as to collect a first current between the rectifier and the motor converter; The second current sensor is connected in series between the bidirectional energy storage converter and the energy storage stack, and is used to collect a second current between the energy storage stack and the bidirectional energy storage converter; The voltage sensor is connected in parallel between the bidirectional energy storage converter and the energy storage stack, and is used to collect the voltage of the energy storage stack; The processor is used to determine the working state of the elevator energy storage device according to the storage energy of the energy storage stack, the operating time of the elevator energy storage device, the pre-acquired electricity price information, the first current, the second current, the opening and closing state of the contactor, and the voltage; and control the operating mode of the elevator energy storage device according to the working state; When the elevator energy storage device is connected to at least two elevators, the elevator energy storage device includes at least two motor converters and a line collection device, and the motor converters are connected to the elevators in a one-to-one correspondence. The first positive terminal of the line collection device is connected to the positive electrode of the motor converter, and the second positive terminal is connected to the positive electrode of the rectifier and the positive electrode of the bidirectional energy storage converter; The first negative terminal of the line collection device is connected to the negative electrode of the motor converter, and the second negative terminal is connected to the negative electrode of the rectifier and the negative electrode of the bidirectional energy storage converter; The processor is specifically used for: Determining a state of charge of the energy storage stack according to the storage energy of the energy storage stack, the operating time, the voltage, and the second current; Determine the working state of the elevator energy storage device according to the electricity price information, the first current, the opening and closing state of the contactor, and the charge state, so as to determine the operation mode of the elevator energy storage device according to the working state; The processor is used to determine the state of charge according to the following formula: Wherein, SOC is the state of charge, _Qc is the energy storage, T is the operating time, ise2 is the second current output value of the second current sensor, and the value of T is determined by the time at which the critical value of the voltage is located; The processor is specifically used for: If the electricity price information is in the first preset electricity price stage, and the state of charge is less than the first preset state of charge, the elevator energy storage device is in the first working state; If the electricity price information is in the second preset electricity price stage, and the state of charge is less than the second preset state of charge, the elevator energy storage device is in the second working state, and the first preset electricity price stage is greater than the second preset electricity price stage; If the first current is less than a preset threshold value, and the state of charge is less than a first preset state of charge, the elevator energy storage device is in a third working state; If the first current is greater than a preset threshold, the contactor is disconnected, and the state of charge is greater than a third preset state of charge, the elevator energy storage device is in a fourth working state; If the first current is less than a preset threshold value, and the state of charge is greater than or equal to a first preset state of charge, the elevator energy storage device is in a fifth working state, wherein the first preset state of charge is greater than the second preset state of charge is greater than the third preset state of charge; If the working state does not belong to the first working state, the second working state, the third working state, the fourth working state and the fifth working state, the elevator energy storage device is in the sixth working state; The elevator energy storage device also includes an energy consumption device, and the processor is specifically used for: If the elevator energy storage device is in the first working state, the contactor is closed, and voltage is provided to the motor converter and the energy storage stack respectively through a preset power supply device; If the elevator energy storage device is in the second working state, the contactor is closed, and voltage is provided to the motor converter and the energy storage stack respectively through the power supply device; If the elevator energy storage device is in the third working state, the motor converter provides voltage to the energy storage stack through the voltage generated during the operation of the elevator; If the elevator energy storage device is in the fourth working state, the energy storage stack provides voltage to the motor converter; If the elevator energy storage device is in the fifth working state, the motor converter provides voltage to the energy consumption device through the voltage generated by the elevator during operation; If the elevator energy storage device is in the sixth working state, the contactor is closed and the power supply device provides voltage to the motor inverter. 2. An elevator energy storage control method, characterized in that it is applied to a processor in the elevator energy storage control device as described in claim 1 above to control the operation mode of the elevator energy storage control device.