CN110460081B

CN110460081B - Charging method and device of energy storage system, server and storage medium

Info

Publication number: CN110460081B
Application number: CN201910859365.2A
Authority: CN
Inventors: 胡斌; 冯琢络; 刘兵; 彭驭风; 李夏威
Original assignee: Huarun Wisdom Energy Co ltd
Current assignee: China Resource Power Technology Research Institute
Priority date: 2019-09-11
Filing date: 2019-09-11
Publication date: 2023-03-21
Anticipated expiration: 2039-09-11
Also published as: CN110460081A

Abstract

The invention discloses a charging method and device of an energy storage system, a server and a storage medium. The charging method of the energy storage system comprises the following steps: determining a target output power according to a currently received scheduling instruction; controlling the energy storage system and the generator set to respond to the current scheduling instruction according to the target output power and outputting corresponding summed output power; when the residual electric quantity of the energy storage system is smaller than a first set threshold value, if the oscillation value of the sum output power of the energy storage system and the generator set is smaller than the value of the target output power, controlling the energy storage system to stop outputting the power; when the residual electric quantity of the energy storage system is larger than the second set threshold value, if the oscillation value of the sum output power of the energy storage system and the generator set is larger than the value of the target output power, the energy storage system is controlled to stop outputting the power.

Description

Charging method and device of energy storage system, server and storage medium

Technical Field

The embodiment of the invention relates to the technical field of energy storage, in particular to a charging method and device of an energy storage system, a server and a storage medium.

Background

At present, an energy storage system is mostly adopted by an electric power system to assist a generator set to adjust the frequency of a power grid, and the energy storage system and the generator set respond to a received scheduling instruction to achieve the output power required by the power grid so as to meet the scheduling requirement of the power grid.

In the prior art, after the energy storage system responds to the scheduling instruction, the energy storage system can be matched with the generator set to stabilize the output power at a preset value, and before the stable state is reached, the energy storage system can generate frequent charging and discharging, so that the invalid response of the energy storage system is increased, the service life of the energy storage system is shortened, and the economy and the stability of the long-term operation of the power system are not facilitated.

Disclosure of Invention

The invention provides a charging method and device of an energy storage system, a server and a storage medium, which are used for reducing invalid response of the energy storage system, prolonging the service life of the energy storage system and ensuring the economy and stability of long-term operation of a power system.

In a first aspect, an embodiment of the present invention provides a charging method for an energy storage system, where the charging method for an energy storage system includes:

determining a target output power according to a currently received scheduling instruction;

controlling the energy storage system and the generator set to respond to the current scheduling instruction according to the target output power and outputting corresponding total output power;

when the residual electric quantity of the energy storage system is smaller than a first set threshold value, if the oscillation value of the summed output power of the energy storage system and the generator set is larger than the value of the target output power, charging the energy storage system, and if the oscillation value of the summed output power of the energy storage system and the generator set is smaller than the value of the target output power, controlling the energy storage system to stop outputting the power;

when the residual electric quantity of the energy storage system is larger than a second set threshold value, if the oscillation value of the sum output power of the energy storage system and the generator set is smaller than the value of the target output power, controlling the energy storage system to discharge, and if the oscillation value of the sum output power of the energy storage system and the generator set is larger than the value of the target output power, controlling the energy storage system to stop outputting power;

and the oscillation value of the sum output power of the energy storage system and the generator set is the oscillation value of the sum output power near the target output power after the energy storage system and the generator set achieve the current scheduling instruction.

Optionally, the scheduling instruction is an automatic generation control AGC instruction.

Optionally, before controlling the energy storage system and the generator set according to the target output power to respond to the current scheduling instruction and output the corresponding summed output power, the method for charging the energy storage system includes:

judging whether the current sum output power of the energy storage system and the generator set can meet the target output power;

if the current sum output power of the energy storage system and the generator set meets the target output power, controlling the energy storage system to respond to the current scheduling instruction;

and if the sum output power of the energy storage system and the generator set does not meet the target output power, controlling the energy storage system to give up responding to the current scheduling instruction.

Optionally, after controlling the energy storage system and the generator set according to the target output power to respond to the current scheduling instruction and output the corresponding summed output power, the method for charging the energy storage system further includes:

determining a first dead zone power threshold according to the current sum output power of the energy storage system and the generator set and the target output power, and acquiring a control target of the energy storage system in a first stage responding to the current scheduling instruction according to the first dead zone power threshold;

after the control target of the first stage is achieved, acquiring a control target of a second stage of the energy storage system responding to the current scheduling instruction according to the target output power;

and determining the response parameters of the current scheduling instruction according to the time and the sum output power corresponding to the control targets of the first stage and the second stage of the energy storage system responding to the current scheduling instruction.

Optionally, after the control target of the first stage is achieved, the obtaining the control target of the second stage, in which the energy storage system responds to the current scheduling instruction, according to the target output power includes:

after the control target of the first stage is achieved, maintaining the current sum output power of the energy storage system and the generator set as the control target of the first stage according to the set delay time, and ensuring that the starting point of the response rate calculation of the response parameter of the current scheduling instruction is reliably obtained;

and acquiring a control target of a second stage of the energy storage system responding to the current dispatching command according to the target output power, and continuously reaching the control target of the second stage, thereby ensuring that a termination point of response rate calculation of a response parameter of the current dispatching command is reliably acquired. In a second aspect, an embodiment of the present invention further provides a charging apparatus for an energy storage system, where the charging apparatus for an energy storage system includes:

the target output power determining module is used for determining the target output power according to the currently received scheduling instruction;

the dispatching instruction response module is used for controlling the energy storage system and the generator set to respond to the current dispatching instruction according to the target output power and outputting corresponding summation output power;

the first energy storage system control module is used for charging the energy storage system if the oscillation value of the summed output power of the energy storage system and the generator set is larger than the value of the target output power when the residual electric quantity of the energy storage system is smaller than a first set threshold value, and controlling the energy storage system to stop outputting the power if the oscillation value of the summed output power of the energy storage system and the generator set is smaller than the value of the target output power;

and the second energy storage system control module is used for controlling the energy storage system to discharge if the oscillation value of the summed output power of the energy storage system and the generator set is smaller than the value of the target output power when the residual electric quantity of the energy storage system is larger than a second set threshold value, and controlling the energy storage system to stop outputting the power if the oscillation value of the summed output power of the energy storage system and the generator set is larger than the value of the target output power.

In a third aspect, an embodiment of the present invention further provides a server, where the server includes:

one or more processors;

storage means for storing one or more programs;

when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the method of charging an energy storage system according to the first aspect.

In a fourth aspect, embodiments of the present invention further provide a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform a method of charging an energy storage system according to the first aspect, the method of charging an energy storage system comprising:

when the residual electric quantity of the energy storage system is larger than a second set threshold value, if the oscillation value of the summed output power of the energy storage system and the generator set is smaller than the value of the target output power, controlling the energy storage system to discharge, and if the oscillation value of the summed output power of the energy storage system and the generator set is larger than the value of the target output power, controlling the energy storage system to stop outputting the power;

According to the charging method and device of the energy storage system, the server and the storage medium provided by the embodiment of the invention, the target output power is determined according to the currently received scheduling instruction, the energy storage system and the generator set are controlled to respond to the current scheduling instruction according to the target output power and output the corresponding total output power, the energy storage system is controlled to be charged or discharged by comparing the residual electric quantity of the energy storage system with the first set threshold value and the second set threshold value, when the residual electric quantity of the energy storage system is smaller than the first set threshold value, the energy storage system is controlled to be charged or stopped to output power according to the oscillation value of the total output power of the energy storage system and the generator set and the value of the target output power, so that the target output power is met while the electric quantity of the energy storage system is not too low, when the residual electric quantity of the energy storage system is larger than the second set threshold value, the energy storage system is controlled to be discharged or stopped to output power according to the oscillation value of the total output power of the energy storage system and the generator set, and the electric power system is not too high, so that the invalid response of the energy storage system is reduced, the service life of the energy storage system is prolonged, and the economic performance and the stability and the long-term stability of the electric power system are ensured.

Drawings

Fig. 1 is a schematic flow chart of a charging method of an energy storage system according to an embodiment of the present invention;

FIG. 2 is a waveform schematic diagram of a summed output power of an energy storage system and a generator set provided in an embodiment of the invention;

fig. 3 is a schematic flow chart of another charging method for an energy storage system provided in an embodiment of the present invention;

fig. 4 is a schematic flow chart of another charging method for an energy storage system provided in the embodiment of the invention;

FIG. 5 is a waveform illustrating a summed output power of another energy storage system and a generator set provided in an embodiment of the present disclosure;

fig. 6 is a schematic flow chart of another charging method for an energy storage system according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a charging device of an energy storage system according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a server provided in an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the prior art, an energy storage system and a generator set can directly respond to a dispatching instruction issued by a power grid dispatching center, the energy storage system and the generator set are matched with output power to stabilize the power at a preset value so as to achieve the output power required by a power grid and meet the dispatching requirement of the power grid, before the output power of the energy storage system and the generator set reaches a stable state, the energy storage system can generate frequent charging and discharging phenomena, the invalid response of the energy storage system is increased, the service life of the energy storage system is shortened, and the economy and the stability of long-term operation of a power system are not facilitated. In view of the foregoing technical problems, embodiments of the present invention provide a charging method and apparatus for an energy storage system, a server, and a storage medium.

Fig. 1 is a schematic flow diagram of a charging method for an energy storage system according to an embodiment of the present invention, where this embodiment is applicable to a situation in which the energy storage system assists a power plant generator set to control charging and discharging of the energy storage system in a process of adjusting a power grid frequency, and the charging method for the energy storage system may be executed by a charging device for the energy storage system according to the embodiment of the present invention, as shown in fig. 1, the charging method for the energy storage system includes the following steps:

step 110, determining a target output power according to the currently received scheduling instruction.

Specifically, the energy storage system and the generator set determine a target output power according to a currently received scheduling instruction, where the scheduling instruction may be a scheduling instruction currently issued by a power grid scheduling center, the scheduling instruction includes a scheduling target determined by the power grid scheduling center according to a power grid frequency modulation requirement, the scheduling target may include the target output power, and the target output power may be the target output power of the power grid power generation side determined by the power grid scheduling center according to a power deviation between the power generation side and the power utilization side of the power grid and an exchange power deviation between adjacent power grids.

For example, the power grid dispatching center may send a dispatching instruction to the remote terminal control system in real time, the dispatching instruction is sent to the power plant through the remote terminal control system, a generator set distributed control system in the power plant may send the dispatching instruction to the generator set and the energy storage system, and the generator set and the energy storage system may determine a target output power according to the currently received dispatching instruction.

And step 120, controlling the energy storage system and the generator set to respond to the current scheduling instruction according to the target output power and outputting corresponding total output power.

Specifically, the energy storage system and the generator set can be controlled to respectively respond to the currently received scheduling instruction according to the target output power corresponding to the currently received scheduling instruction, and the corresponding total output power is output according to the sum of powers which can be output by the energy storage system and the generator set after responding to the scheduling instruction.

For example, when the energy storage system and the generator set receive and respond to the scheduling command, the energy storage system may determine a power range that the energy storage system may output according to the current electric quantity of the energy storage system and the operating condition of the generator set, the generator set may determine, according to the current output power of the generator set, the power that may be output after responding to the scheduling command, and the energy storage system and the generator set respectively respond to the total output power corresponding to the scheduling command according to the respective outputtable power.

And step 130, when the remaining capacity of the energy storage system is smaller than a first set threshold, if the oscillation value of the summed output power of the energy storage system and the generator set is larger than the value of the target output power, charging the energy storage system, and if the oscillation value of the summed output power of the energy storage system and the generator set is smaller than the value of the target output power, controlling the energy storage system to stop outputting the power.

The remaining capacity of the energy storage system may be a remaining capacity of an energy storage battery of the energy storage system, may be a State of Charge (SOC) of the energy storage battery, specifically may be a ratio of a remaining dischargeable capacity of the energy storage battery to a capacity of a fully charged State of the energy storage battery, and may be represented by a percentage, for example, the remaining capacity of the energy storage battery may range from 0% to 100%, when the SOC value is 0, the energy storage battery is completely discharged, and when the SOC value is 100%, the energy storage battery is completely fully charged.

The first set threshold may be set as a value of the SOC of the energy storage battery, and specifically may be a threshold of the energy storage battery in a low state of charge, for example, when the value of the SOC is between 0% and 45%, it may be determined that the energy storage battery is in the low state of charge, and then the first set threshold may be set to 45%, and the first set threshold may be set according to an actual application situation, which is not limited in this embodiment of the present invention.

The oscillation value of the summed output power of the energy storage system and the generator set may be an oscillation value of the summed output power after the energy storage system and the generator set respond to the currently received scheduling instruction, before the summed output power output by the energy storage system and the generator set approaches the target output power and reaches the steady state, the value of the summed output power may be the oscillation value of the summed output power.

Fig. 2 is a schematic waveform diagram of the summed output power of the energy storage system and the generator set according to an embodiment of the present invention, where fig. 2 exemplarily shows a waveform of the summed output power output by the energy storage system and the generator set in response to a currently received scheduling instruction, and as shown in fig. 2, after the energy storage system and the generator set respond to the currently received scheduling instruction, the summed output power of the energy storage system and the generator set is stabilized near a value P13 of the target output power according to the target output power, respectively, and before reaching a steady state, the value of the summed output power oscillates, when the remaining capacity of the energy storage system is smaller than a first set threshold, for example, the first set threshold may be 45%, the remaining capacity of the energy storage system is smaller than 45%, if the oscillation value P14 of the summed output power is larger than the value P13 of the target output power, the current summed output power is already larger than the target output power, the energy storage system may not need to modulate the output power currently, and since the remaining capacity of the energy storage system is smaller than 45%, the energy storage battery is currently in a low capacity state, the energy storage system may be charged, and when the energy storage battery is in a low capacity state, the energy storage system may respond to the scheduling instruction; if the oscillation value P12 of the summed output power is smaller than the value P13 of the target output power, because the current summed output power is close to the target output power and the summed output power oscillates more before entering a steady state, if the energy storage system frequently responds to influence the service life of the energy storage system, the energy storage system can be controlled to stop outputting the power, thus, when the energy storage battery is in a low-power state, the energy storage system only performs charging operation when the oscillation value of the summed output power is larger than the value of the target output power, thereby avoiding the over-low power of the energy storage battery, and meanwhile, the energy storage system does not perform discharging operation, does not act to reduce invalid response, and is beneficial to prolonging the service life of the energy storage system.

And step 140, when the remaining capacity of the energy storage system is greater than a second set threshold, if the oscillation value of the summed output power of the energy storage system and the generator set is less than the value of the target output power, controlling the energy storage system to discharge, and if the oscillation value of the summed output power of the energy storage system and the generator set is greater than the value of the target output power, controlling the energy storage system to stop outputting the power.

The second set threshold may be set as a value of the SOC of the energy storage battery, specifically, may be a threshold of the energy storage battery in a high state of charge, for example, when the value of the SOC is between 55% and 100%, it may be determined that the energy storage battery is in the high state of charge, and then the second set threshold may be set to 55%, and the second set threshold may be set according to an actual application condition, which is not limited in this embodiment of the present invention.

For example, with reference to fig. 2, after the energy storage system and the generator set respond to the currently received scheduling instruction, respectively, according to the target output power in cooperation with the output, the summed output power of the energy storage system and the generator set is stabilized near the value P13 of the target output power, before reaching a steady state, the value of the summed output power oscillates, when the remaining power of the energy storage system is greater than a second set threshold, for example, the second set threshold may be 55%, the remaining power of the energy storage system is greater than 55%, if the oscillating value P12 of the summed output power is less than the value P13 of the target output power, the current summed output power is lower than the target output power, the energy storage system currently needs to modulate the output power, and since the remaining power of the current energy storage system is greater than 55%, the energy storage battery of the energy storage system is currently in a high power state, the energy storage system may be discharged at this time, so that when the energy storage battery is in a high power state, the energy storage battery may be discharged to output power; if the oscillation value P14 of the summed output power is greater than the value P13 of the target output power, the current summed output power is greater than the target output power, the energy storage system does not need to modulate the output power temporarily at present, and the energy storage battery of the energy storage system does not need to be charged because the energy storage battery is in a high-power state at present, and the energy storage system is controlled to stop outputting the power.

It should be noted that, in the embodiment of the present invention, the execution sequence of step 130 and step 140 is not limited, and step 130 and step 140 are only described for two cases of the magnitude of the remaining energy of the energy storage system, and there is no sequential execution sequence, and the values of the first set threshold and the second set threshold may be the same value or different values as long as the first set threshold is less than or equal to the second set threshold, which is not limited in this embodiment of the present invention.

Optionally, when the remaining capacity of the energy storage system is between the first set threshold and the second set threshold, if the value of the summed output power of the energy storage system and the generator set is in the oscillation stage, the energy storage system is controlled to stop outputting the power.

Specifically, under the condition that the first set threshold value and the second set threshold value are different values and the first set threshold value is smaller than the second set threshold value, when the remaining capacity of the energy storage system is greater than or equal to the first set threshold value and smaller than or equal to the second set threshold value, if the value of the sum output power of the energy storage system and the generator set is in an oscillation stage, the energy storage system is controlled to stop outputting the power.

For example, the first set threshold may be 45%, the second set threshold may be 55%, the SOC of the energy storage battery of the energy storage system may be 50%, and with reference to fig. 2, after the energy storage system and the generator set respond to the currently received scheduling command, the total output power of the energy storage system and the generator set is stabilized around the value P13 of the target output power according to the target output power and the output power is coordinated with the target output power, and before reaching the steady state, the total output power is in an oscillation phase, in which the energy storage system may be controlled to stop the output power regardless of a time when the oscillation value P14 of the total output power is greater than the value P13 of the target output power, or when the oscillation value P12 of the total output power is less than the value P13 of the target output power, and the charging and discharging operations are not performed.

The charging method of the energy storage system provided by the embodiment of the invention determines the target output power according to the currently received scheduling instruction, controls the energy storage system and the generator set to respond to the current scheduling instruction and output the corresponding total output power according to the target output power, controls the energy storage system to charge or discharge by comparing the residual electric quantity of the energy storage system with the first set threshold value and the second set threshold value, and controls the energy storage system to charge or stop the output power according to the oscillation value of the total output power of the energy storage system and the generator set and the value of the target output power when the residual electric quantity of the energy storage system is smaller than the first set threshold value, so that the target output power is met without causing the electric quantity of the energy storage system to be too low, and when the residual electric quantity of the energy storage system is larger than the second set threshold value, the energy storage system is controlled to discharge or stop the output power according to the oscillation value of the total output power of the energy storage system and the value of the target output power, so that the target output power is met without causing the electric quantity of the energy storage system to be too high, the invalid response of the energy storage system is reduced, the service life of the energy storage system is prolonged, and the economy and the stability of the long-term operation of the power system are ensured.

Optionally, on the basis of the above technical solution, the scheduling instruction may be an Automatic power generation Control (AGC) instruction.

The scheduling instruction may be an AGC instruction generated by a power grid scheduling center in real time according to a frequency deviation between a power generation side and a power utilization side of a power grid and an exchange power deviation between adjacent power grids, a scheduling target included in the AGC instruction may be a target output power of the power grid, and the AGC instruction may be used to control the output power of the power grid through the target output power, so as to adjust the frequency of the power grid.

Illustratively, the power grid dispatching center can send an AGC instruction to a power plant according to a power grid frequency modulation requirement, the power plant sends the AGC instruction to the generator set and the energy storage system, so that the generator set and the energy storage system determine target output power according to the received AGC instruction, the output of the generator set and the energy storage system is controlled in real time through the AGC instruction, and the output power of the power grid is adjusted to adapt to power change of an application side, so that power balance between a power generation side and a power utilization side is achieved, the frequency of the power grid is stable, and the frequency modulation requirement is met.

Fig. 3 is a schematic flow chart of another charging method for an energy storage system according to an embodiment of the present invention, which is applicable to a situation that the energy storage system assists a power plant generator set to control charging and discharging of the energy storage system during a process of adjusting a power grid frequency, where the charging method for the energy storage system may be executed by the charging device for the energy storage system according to the embodiment of the present invention, and optionally, as shown in fig. 3, the charging method for the energy storage system specifically includes the following steps:

step 210, determining a target output power according to the currently received scheduling instruction.

And step 220, judging whether the current sum output power of the energy storage system and the generator set can meet the target output power.

The sum of the current first output power of the energy storage system and the current second output power of the generator set can be calculated to determine the sum of the output power of the energy storage system and the output power of the generator set, and whether the sum can meet the target output power is judged.

For example, a first output power of the energy storage system when the energy storage system receives the current scheduling instruction is obtained, and the first output power of the energy storage system may be determined according to a current electric quantity of an energy storage battery of the energy storage system, where the first output power may be a power value within a power range that the energy storage system can output when receiving the current scheduling instruction. Specifically, the charging and discharging processes of the energy storage battery can be monitored in real time, the output current and the output voltage of the energy storage system can be obtained through the current sensor and the voltage sensor on the output line of the energy storage system, the current electric quantity of the energy storage system can be calculated according to the output current and the output voltage of the energy storage system when the energy storage system receives the current scheduling instruction, and the current first output power of the energy storage system can be obtained.

The second output power of the generator set can be calculated according to the operation condition data of the generator set when the current scheduling instruction is received, illustratively, a distributed control system of the generator set in the power plant can monitor the operation condition of the generator set in real time, obtain the output current and the output voltage of the generator set measured by a current sensor and a voltage sensor on an output line of the generator set in real time and send the output current and the output voltage to an energy storage system, and the energy storage system can calculate the current second output power of the generator set according to the output current and the output voltage of the generator set when the current scheduling instruction is received.

For example, the energy storage system may estimate a total output that can be provided by the energy storage system and the generator set after receiving and responding to the currently received scheduling instruction by calculating the total output power, and the energy storage system may determine whether the total output of the energy storage system and the generator set can satisfy the target output by comparing the total output power with the target output power, so as to determine whether the frequency modulation requirement of the power grid can be satisfied if the energy storage system and the generator set respond to the currently received scheduling instruction.

If the target output power corresponding to the scheduling instruction currently received by the energy storage system is greater than the target output power corresponding to the previous scheduling instruction, whether the summed output power can meet the target output power can be judged by judging whether the summed output power is greater than or equal to the target output power; if the target output power corresponding to the scheduling instruction currently received by the energy storage system is smaller than the target output power corresponding to the previous scheduling instruction, whether the summed output power can meet the target output power can be judged by judging whether the summed output power is smaller than or equal to the target output power.

If the current summed output power of the energy storage system and the generator set meets the target output power, step 230 is executed to control the energy storage system to respond to the current scheduling command.

Illustratively, if the current summed output power of the energy storage system and the generator set meets the target output power, the energy storage system and the generator set are controlled to respond to the current scheduling command, and the step 250 is continuously executed.

If the current sum output power of the energy storage system and the generator set does not meet the target output power, step 240 is executed to control the energy storage system to give up responding to the current scheduling instruction.

For example, if the total output power of the energy storage system and the generator set cannot meet the value of the target output power, it can be considered that the total output power of the energy storage system and the generator set cannot reach the target output power even if the energy storage system responds to the current scheduling command and outputs power according to the first output power, and the power grid frequency modulation requirement corresponding to the current scheduling command cannot be met, the energy storage system can be controlled to give up responding to the current scheduling command, so that the energy storage system is prevented from making invalid response, and energy consumption and waste are reduced.

And step 250, controlling the energy storage system and the generator set to respond to the current scheduling instruction according to the target output power and outputting corresponding total output power.

And step 260, when the residual electric quantity of the energy storage system is smaller than a first set threshold value, if the oscillation value of the sum output power of the energy storage system and the generator set is larger than the value of the target output power, charging the energy storage system, and if the oscillation value of the sum output power of the energy storage system and the generator set is smaller than the value of the target output power, controlling the energy storage system to stop outputting the power.

And 270, when the residual electric quantity of the energy storage system is larger than a second set threshold value, if the oscillation value of the summed output power of the energy storage system and the generator set is smaller than the value of the target output power, controlling the energy storage system to discharge, and if the oscillation value of the summed output power of the energy storage system and the generator set is larger than the value of the target output power, controlling the energy storage system to stop outputting the power.

Fig. 4 is a schematic flow chart of another charging method for an energy storage system according to an embodiment of the present invention, which is applicable to a situation that the energy storage system assists a power plant generator set to control charging and discharging of the energy storage system during a process of adjusting a power grid frequency, where the charging method for the energy storage system may be executed by the charging device for the energy storage system according to the embodiment of the present invention, and optionally, as shown in fig. 4, the charging method for the energy storage system specifically includes the following steps:

step 302, determining a target output power according to a currently received scheduling instruction.

And step 304, controlling the energy storage system and the generator set to respond to the current scheduling instruction according to the target output power and outputting corresponding total output power.

And step 306, determining a first dead zone power threshold according to the current sum output power of the energy storage system and the generator set and the target output power, and acquiring a control target of the energy storage system in a first stage responding to the current scheduling instruction according to the first dead zone power threshold.

The first dead-zone power threshold may be a deviation value of a current summed output power of the energy storage system and the generator set, and a control target of the energy storage system in a first stage responding to the current scheduling command may be determined according to the first dead-zone power threshold.

Fig. 5 is a waveform diagram of a summed output power of another energy storage system and a generator set according to an embodiment of the present invention, for example, fig. 5 shows a case that a target output power corresponding to a currently received scheduling command of the energy storage system is greater than a target output power corresponding to a last scheduling command, the energy storage system responds to the currently received scheduling command at time t0, the target output power corresponding to the scheduling command is P4, and the summed output power of the energy storage system and the generator set at time t0 is power P1, a first dead zone power threshold may be set according to the power P1 and the target output power P4, and a first dead zone corresponding to the power P1 may be set according to the first dead zone power threshold, the first dead zone may be an interval within a set positive and negative deviation value range of the power P1, wherein the first dead zone power threshold may be set as an offset value, and the magnitude of the first dead zone power threshold may be set in combination with actual conditions, for example, the first dead zone corresponding to the power P1 may be [ P0, P2-P1 ], or P1-P2, where the corresponding first dead zone power threshold is set as a first dead zone power threshold — P2, where the energy storage system receives the current scheduling command in response stage, and the target output power control command is set as a target output power response stage.

And 308, after the control target of the first stage is achieved, acquiring a control target of a second stage of the energy storage system responding to the current scheduling instruction according to the target output power.

Specifically, when the summed output power of the energy storage system and the generator set meets the control target of the first stage, the energy storage system may be considered to achieve the control target of the first stage, and the control target of the second stage, in which the energy storage system responds to the current scheduling instruction, may be determined according to the target output power corresponding to the scheduling instruction currently received by the energy storage system.

For example, with reference to fig. 5, if the control target of the energy storage system in the first phase responding to the current scheduling command is power P2, the energy storage system achieves the control target of the first phase at time t1, the first phase of the energy storage system responding to the current scheduling command may correspond to a phase [ t0, t1], and after time t1, the energy storage system starts responding to the second phase of the current scheduling command, and the target output power P4 may be set as the control target of the energy storage system responding to the second phase of the current scheduling command. The second stage of the energy storage system responding to the current scheduling command may be from time t1 to a time when the summed output power of the energy storage system and the generator set meets the control target of the second stage.

And 310, determining response parameters of the current scheduling instruction according to the time and the total output power corresponding to the control targets of the first stage and the second stage of the energy storage system responding to the current scheduling instruction.

Specifically, the response parameters of the current scheduling instruction may be determined according to the time and the summed output power corresponding to the control target of the energy storage system reaching the first stage of the current scheduling instruction, and the time and the summed output power corresponding to the control target of the energy storage system reaching the second stage of the current scheduling instruction, where the response parameters may include the response time, the response rate, and the response precision of the energy storage system responding to the current scheduling instruction.

In the prior art, generally, the energy storage system is directly controlled to respond to a received scheduling instruction, if the energy storage system responds too fast, a response often occurs that the system cannot recognize the response, thereby causing an abnormal acquisition of a response parameter, for example, referring to fig. 5, if the energy storage system receives and responds to a current scheduling instruction at time t0, since the energy storage system responds too fast, a situation that the summed output power of the energy storage system and the generator set rapidly rises from power P1 to target output power P4 occurs, for example, the summed output power at time t0 rapidly changes to target output power P4, so that a key point of the response parameter cannot be acquired, for example, if the energy storage system responds too fast, the power dead zone corresponding to the summed output power when the energy storage system and the generator set receive the current scheduling instruction is the same point as the power of the summed output power when the energy storage system and the generator set receive the current scheduling instruction, that is the M point and the N point are the same point, so that the response rate of the current scheduling instruction cannot be determined, the charging method for the energy storage system divides the control process of responding to the currently received scheduling instruction into two stages, sets the first stage and sets the summed output power of the first stage as the first stage, so that the summed output power of the first stage of the summed control stage and the current scheduling instruction can be ensured according to the first stage, and the first stage of the summed output stage of the control stage of the energy storage system, thereby achieving the first stage.

And step 312, when the remaining capacity of the energy storage system is smaller than the first set threshold, if the oscillation value of the summed output power of the energy storage system and the generator set is larger than the target output power value, charging the energy storage system, and if the oscillation value of the summed output power of the energy storage system and the generator set is smaller than the target output power value, controlling the energy storage system to stop outputting power.

And step 314, when the remaining capacity of the energy storage system is greater than the second set threshold, if the oscillation value of the summed output power of the energy storage system and the generator set is less than the value of the target output power, controlling the energy storage system to discharge, and if the oscillation value of the summed output power of the energy storage system and the generator set is greater than the value of the target output power, controlling the energy storage system to stop outputting the power.

Fig. 6 is a schematic flow chart of another charging method for an energy storage system according to an embodiment of the present invention, where this embodiment is applicable to a situation that the energy storage system assists a power generating unit of a power plant to perform charging and discharging of the energy storage system in a process of adjusting a power grid frequency, and the charging method for the energy storage system may be executed by a charging device for the energy storage system according to an embodiment of the present invention, optionally, as shown in fig. 6, the charging method for the energy storage system specifically includes the following steps:

step 402, determining a target output power according to a currently received scheduling instruction.

And step 404, controlling the energy storage system and the generator set to respond to the current scheduling instruction according to the target output power and outputting corresponding total output power.

And 406, determining a first dead zone power threshold according to the current sum output power of the energy storage system and the generator set and the target output power, and acquiring a control target of the energy storage system in a first stage responding to the current scheduling instruction according to the first dead zone power threshold.

And step 408, after the control target of the first stage is achieved, maintaining the current summation output power of the energy storage system and the generator set as the control target of the first stage according to the set delay time, and ensuring that the starting point of the response rate calculation of the response parameter of the current scheduling instruction is reliably obtained.

Specifically, after the energy storage system is controlled to achieve the control target of the first stage, the current summed output power of the energy storage system and the generator set is controlled to be maintained as the control target of the first stage within a set delay time period until a starting point of calculation of a response rate of a response parameter of a current scheduling instruction is reliably obtained.

For example, referring to fig. 5, if the control target of the energy storage system in the first stage responding to the current scheduling command is power P2, the energy storage system achieves the control target of the first stage at time t1, and may control the current summed output power of the energy storage system and the generator set to be maintained at P2 within a set delay time period until a starting point of the response rate calculation of the response parameter of the current scheduling command is reliably obtained, where the starting point of the response rate calculation may be an M point, and the set delay time may be set according to an actual situation, so as to ensure that the M point is reliably obtained, which is not limited in the embodiment of the present invention.

And step 410, acquiring a second-stage control target of the energy storage system responding to the current scheduling instruction according to the target output power, and continuing until the second-stage control target is achieved, so as to ensure that a termination point of the response rate calculation of the response parameter of the current scheduling instruction is reliably acquired.

Specifically, a control target of a second stage of the energy storage system responding to the current scheduling instruction is obtained according to the target output power, the energy storage system is controlled to respond and continue until the control target of the second stage is achieved, and the fact that a termination point of response rate calculation of a response parameter of the current scheduling instruction is reliably obtained is guaranteed.

For example, with continued reference to fig. 5, if the target output power of the energy storage system in response to the current scheduling command is P4, the target output power P4 may be set as the control target of the energy storage system in response to the second phase of the current scheduling command, and the energy storage system may be controlled in response to the second phase of the current scheduling command until the current summed output power of the energy storage system and the generator set reaches the control target of the second phase, for example, when the current summed output power of the energy storage system and the generator set is P3, it may be determined that the energy storage system reaches the control target of the second phase, and the energy storage system may be controlled until the end point N of the response rate calculation of the response parameter of the current scheduling command is reliably obtained.

And step 412, determining response parameters of the current scheduling instruction according to the time and the total output power corresponding to the control targets of the first stage and the second stage of the energy storage system responding to the current scheduling instruction.

And step 414, when the remaining capacity of the energy storage system is smaller than the first set threshold, if the oscillation value of the summed output power of the energy storage system and the generator set is larger than the value of the target output power, charging the energy storage system, and if the oscillation value of the summed output power of the energy storage system and the generator set is smaller than the value of the target output power, controlling the energy storage system to stop outputting the power.

And step 416, when the remaining capacity of the energy storage system is greater than a second set threshold, if the oscillation value of the summed output power of the energy storage system and the generator set is smaller than the value of the target output power, controlling the energy storage system to discharge, and if the oscillation value of the summed output power of the energy storage system and the generator set is greater than the value of the target output power, controlling the energy storage system to stop outputting power. Fig. 7 is a schematic structural diagram of a charging device of an energy storage system according to an embodiment of the present invention, and as shown in fig. 7, the charging device of the energy storage system includes:

and a target output power determining module 400, configured to determine a target output power according to the currently received scheduling instruction.

And the dispatching instruction response module 500 is used for controlling the energy storage system and the generator set to respond to the current dispatching instruction according to the target output power and outputting the corresponding sum output power.

The first energy storage system control module 600 is configured to, when the remaining power of the energy storage system is smaller than a first set threshold, charge the energy storage system if the oscillation value of the summed output power of the energy storage system and the generator set is larger than the target output power value, and control the energy storage system to stop outputting power if the oscillation value of the summed output power of the energy storage system and the generator set is smaller than the target output power value.

And the second energy storage system control module 700 is configured to, when the remaining electric quantity of the energy storage system is greater than a second set threshold, control the energy storage system to discharge if the oscillation value of the summed output power of the energy storage system and the generator set is smaller than the target output power value, and control the energy storage system to stop outputting power if the oscillation value of the summed output power of the energy storage system and the generator set is greater than the target output power value.

The charging device of the energy storage system provided by the embodiment of the invention determines the target output power according to the currently received scheduling instruction, controls the energy storage system and the generator set to respond to the current scheduling instruction and output the corresponding summed output power according to the target output power, controls the energy storage system to charge or discharge by comparing the residual electric quantity of the energy storage system with the first set threshold value and the second set threshold value, controls the energy storage system to charge or stop the output power according to the oscillation value of the summed output power of the energy storage system and the generator set and the value of the target output power when the residual electric quantity of the energy storage system is smaller than the first set threshold value, thus, the electric quantity of the energy storage system cannot be too low while the target output power is met, controls the energy storage system to discharge or stop the output power according to the oscillation value of the summed output power of the energy storage system and the generator set and the value of the target output power when the residual electric quantity of the energy storage system is larger than the second set threshold value, thus, the electric quantity of the energy storage system cannot be too high while the target output power is met, the invalid response of the energy storage system is reduced, the service life of the energy storage system is prolonged, and the economy and the long-term operation and the stability of the power system are ensured.

Optionally, on the basis of the above technical solution, the scheduling instruction is an automatic generation control AGC instruction.

Optionally, on the basis of the above technical solution, the charging device of the energy storage system further includes:

the scheduling instruction processing module is used for judging whether the sum output power of the energy storage system and the generator set can meet the target output power; if the sum output power of the energy storage system and the generator set meets the target output power, controlling the energy storage system and the generator set to respond to the current scheduling instruction; and if the sum output power of the energy storage system and the generator set does not meet the target output power, controlling the energy storage system and the generator set to give up responding to the current scheduling instruction.

the real-time power control module is used for determining a first dead zone power threshold according to the current sum output power of the energy storage system and the generator set and the target output power, and acquiring a control target of a first stage of the energy storage system responding to the current scheduling instruction according to the first dead zone power threshold; after the control target of the first stage is achieved, acquiring a control target of a second stage of the energy storage system responding to the current scheduling instruction according to the target output power; and determining the response parameters of the current scheduling instruction according to the time and the total output power corresponding to the control targets of the first stage and the second stage of the energy storage system responding to the current scheduling instruction.

Optionally, on the basis of the foregoing technical solution, the real-time power control module is further configured to:

after the control target of the first stage is achieved, maintaining the current summation output power of the energy storage system and the generator set as the control target of the first stage according to the set delay time, and ensuring that the initial point of the response rate calculation of the response parameter of the current scheduling instruction is reliably obtained; and obtaining a control target of a second stage of the energy storage system responding to the current scheduling instruction according to the target output power, and continuing to achieve the control target of the second stage, so as to ensure that a termination point of response rate calculation of a response parameter of the current scheduling instruction is reliably obtained.

The charging device of the energy storage system provided by the embodiment of the invention can execute the charging method of the energy storage system provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.

Fig. 8 is a schematic structural diagram of a server according to an embodiment of the present invention, as shown in fig. 8, the server includes a processor 70, a memory 71, an input device 72, and an output device 73; the number of the processors 70 in the server may be one or more, and one processor 70 is taken as an example in fig. 8; the processor 70, the memory 71, the input device 72 and the output device 73 in the server may be connected by a bus or other means, and the connection by the bus is exemplified in fig. 8.

The memory 71 serves as a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the charging method of the energy storage system in the embodiment of the present invention (for example, the target output power determining module 400, the scheduling instruction responding module 500, the first energy storage system control module 600, and the second energy storage system control module 700 in the charging device of the energy storage system). The processor 70 executes various functional applications of the server and data processing by executing software programs, instructions and modules stored in the memory 71, so as to implement the charging method of the energy storage system.

The memory 71 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 71 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, memory 71 may further include memory located remotely from processor 70, which may be connected to a server over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The input device 72 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the server. The output device 73 may include a display device such as a display screen.

Embodiments of the present invention also provide a storage medium containing computer-executable instructions, which when executed by a computer processor, perform a method of charging an energy storage system, the method of charging an energy storage system including:

when the residual electric quantity of the energy storage system is larger than a second set threshold value, if the oscillation value of the sum output power of the energy storage system and the generator set is smaller than the value of the target output power, the energy storage system is controlled to discharge, and if the oscillation value of the sum output power of the energy storage system and the generator set is larger than the value of the target output power, the energy storage system is controlled to stop outputting power.

Of course, the storage medium containing the computer-executable instructions provided by the embodiments of the present invention is not limited to the method operations described above, and may also perform related operations in the charging method for the energy storage system provided by any embodiments of the present invention.

From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention or portions thereof contributing to the prior art may be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.

It should be noted that, in the above embodiment, each module included in the charging device of the energy storage system is only divided according to the functional logic, but is not limited to the above division, as long as the corresponding function can be realized; in addition, the specific names of the functional modules are only for convenience of distinguishing from each other and are not used for limiting the protection scope of the present invention.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements and substitutions will now be apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method of charging an energy storage system, comprising:

controlling an energy storage system and a generator set to respond to the current scheduling instruction according to the target output power and outputting corresponding total output power;

when the residual electric quantity of the energy storage system is larger than a second set threshold, if the oscillation value of the summed output power of the energy storage system and the generator set is smaller than the value of the target output power, controlling the energy storage system to discharge, and if the oscillation value of the summed output power of the energy storage system and the generator set is larger than the value of the target output power, controlling the energy storage system to stop outputting the power;

the oscillation value of the summed output power of the energy storage system and the generator set is the oscillation value of the summed output power near the target output power after the energy storage system and the generator set achieve the current scheduling instruction;

before controlling the energy storage system and the generator set to respond to the current scheduling instruction and output corresponding total output power according to the target output power, the charging method of the energy storage system comprises the following steps:

and if the current sum output power of the energy storage system and the generator set does not meet the target output power, controlling the energy storage system to give up responding to the current scheduling instruction.

2. The method of charging an energy storage system of claim 1, wherein the scheduling command is an Automatic Generation Control (AGC) command.

3. The method of claim 1, wherein after controlling the energy storage system and the generator set according to the target output power to respond to the current scheduling command and output the corresponding summed output power, the method further comprises:

after the control target of the first stage is achieved, obtaining a control target of a second stage in which the energy storage system responds to the current scheduling instruction according to the target output power;

4. The method according to claim 3, wherein the obtaining the control target of the second phase of the energy storage system responding to the current scheduling command according to the target output power after the control target of the first phase is achieved comprises:

and acquiring a control target of a second stage of the energy storage system responding to the current dispatching command according to the target output power, and continuously reaching the control target of the second stage, thereby ensuring that a termination point of response rate calculation of a response parameter of the current dispatching command is reliably acquired.

5. A charging device for an energy storage system, comprising:

the first energy storage system control module is used for charging the energy storage system if the oscillation value of the summed output power of the energy storage system and the generator set is larger than the value of the target output power when the residual electric quantity of the energy storage system is smaller than a first set value, and controlling the energy storage system to stop outputting the power if the oscillation value of the summed output power of the energy storage system and the generator set is smaller than the value of the target output power;

the second energy storage system control module is used for controlling the energy storage system to discharge if the oscillation value of the summed output power of the energy storage system and the generator set is smaller than the value of the target output power when the residual electric quantity of the energy storage system is larger than a second set value, and controlling the energy storage system to stop outputting the power if the oscillation value of the summed output power of the energy storage system and the generator set is larger than the value of the target output power;

6. A server, characterized in that the server comprises:

one or more processors;

storage means for storing one or more programs;

when executed by the one or more processors, cause the one or more processors to implement the method of charging the energy storage system of any of claims 1-4.

7. A storage medium containing computer-executable instructions, which when executed by a computer processor, perform a method of charging an energy storage system, the method comprising:

determining target output power according to a currently received scheduling instruction;