CN-121984128-A - Industrial park backflow prevention flexible control method and system integrating source storage adjustable margin

CN121984128ACN 121984128 ACN121984128 ACN 121984128ACN-121984128-A

Abstract

The industrial park backflow prevention control method and system integrating the energy storage adjustable margin are used for determining layered regulation values of distributed power supply output under an early warning level and an action level based on a flexible control target when backflow risks exist, determining layered regulation values of energy storage power under a safety level, stopping discharging energy storage when the backflow urgency index is not more than 0, controlling energy storage charging based on the layered regulation values of the energy storage power adjustable margin range when the backflow urgency index is within the energy storage power adjustable margin range, controlling distributed power supply output based on the layered regulation values of the distributed power supply output with maximum energy storage charging power under the early warning level, executing distributed power supply cutting operation when the backflow urgency index is not within the distributed power supply output and energy storage power adjustable margin range under the action level, and maximizing distributed energy utilization efficiency and economic benefit while ensuring that park power is not in backflow.

Inventors

WEI JIERU
PENG QI
MENG ZIJUN
WANG HE
Ding Liliang
YIN YAO
CHEN HANG
SHEN YULONG
WU JIAN
ZHOU SHAOLIANG
ZHANG MIN

Assignees

国电南瑞科技股份有限公司
国网电力科学研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20260127

Claims (17)

1. An industrial park backflow prevention control method integrating source storage adjustable margin is characterized by comprising the following steps: Monitoring operation data and operation states of a distributed power supply and energy storage in an industrial park, and respectively evaluating adjustable margin ranges of output and energy storage power of the distributed power supply; When detecting that the industrial park micro-grid has a countercurrent risk, evaluating the countercurrent risk level, wherein the risk level comprises a safety level, an early warning level and an action level; Based on the flexible control target, combining the power ramp rate of the distributed power supply, calculating the optimal value of the power difference between adjacent levels of the power output adjustable margin range of the distributed power supply under different risk levels to determine the layered regulation value of the power output of the distributed power supply under the early warning level and the action level; Taking the difference value between the control threshold value of the safety level and the net load power of the micro-grid as a countercurrent urgency index; under the safety level, if the counter-current urgency index is not more than 0, stopping discharging energy stored in the park, if the counter-current urgency index is within the adjustable margin range of the energy storage power, controlling the energy storage charging based on the layered adjustment value of the adjustable margin range of the energy storage power; and when no countercurrent risk of the industrial park microgrid is detected, ending the countercurrent prevention control.
2. The industrial park backflow prevention control method with the adjustable margin of the fusion source storage according to claim 1, wherein, Monitoring the power of the grid-connected point in real time, and judging that the industrial park micro-grid has a countercurrent risk when the power of the grid-connected point is smaller than a set threshold value, otherwise, judging that the industrial park micro-grid has no countercurrent risk when the power of the grid-connected point is not smaller than the set threshold value; The net power of the grid-connected point is the difference value of the power of the grid-connected point and the energy storage power, and the risk level of countercurrent determined according to the net power of the grid-connected point comprises a safety level, an early warning level and an action level; Setting the countercurrent risk level as a safety level when the net power of the grid-connected point is not greater than the control threshold, setting the countercurrent risk level as an early warning level when the net power of the grid-connected point is greater than the control threshold but not greater than the early warning threshold, and setting the countercurrent risk level as an action level when the net power of the grid-connected point is greater than the early warning threshold.
3. The industrial park backflow prevention control method with the adjustable margin of the fusion source storage according to claim 2, wherein, The weighted sum of the distributed power supply power discarding quantity, the counter-current power, the action times of the protection device and the complexity punishment items of the layered control strategy is used as a flexible control target at minimum The following formula is shown: =min[ × + × + × + × ] In the formula, 、、、 Are all weight coefficients dynamically allocated based on the countercurrent risk level, + + + =1; The power reject amount normalization value is used for the distributed power supply, As a normalized value of the reverse flow power, In order to protect the number of actions of the device, Penalty terms for hierarchical control strategy complexity.
4. The industrial park anti-reflux control method with the adjustable margin of the fusion source storage according to claim 3, wherein, Determining a complexity penalty term of the hierarchical control strategy by adopting a fitting method, wherein the complexity penalty term is shown in the following formula: = × + × + × + × In the formula, 、、、 Are all the fitting coefficients, and are used for fitting the fitting coefficients, The number of layers for the margin range of distributed power output adjustability, For the number of tiers of the stored power adjustable margin range, Normalized values for power differences between adjacent tiers of the distributed power supply output adjustable margin range, The power difference between adjacent levels of the margin range is normalized for the stored energy power.
5. The industrial park anti-reflux control method with the adjustable margin of the fusion source storage according to claim 3, wherein, Under the safety level, 0.5< <1 And + + + =1; Under the early warning level, 0.5 </v < + <1 And < And is also provided with + + + =1; Under action level, 0.5< + <1 And < And is also provided with + + + =1。
6. The industrial park backflow prevention control method with the adjustable margin of the fusion source storage according to claim 1, wherein, Based on a flexible control target, according to historical operation data of a distributed power supply and energy storage in an industrial park, an optimization algorithm is adopted to determine power differences between adjacent levels of a distributed power supply output adjustable margin range under different risk levels Combining the power output climbing rate of the distributed power supply, and determining the optimal value of the power difference between adjacent layers in the power output adjustable margin range of the distributed power supply according to the following relation : =max( , ) In the formula, To be in control period And a distributed power ramp rate 95% split value calculated based on the data of the past 30 minutes.
7. The industrial park backflow prevention control method with the adjustable margin of the fusion source storage of claim 6, characterized in that, Based on the early warning level and the action level Average division of the margin range of the distributed power supply output Layer, 1 +.f rated output of distributed power supply The multiple is used as a layered regulation value of the distributed power supply output.
8. The industrial park backflow prevention control method with the adjustable margin of the fusion source storage of claim 7, wherein, Based on different risk classes And industrial park microgrid load fluctuation, determining the optimal value of the power difference between adjacent levels of the energy storage power adjustable margin range under different risk levels according to the following relation : =max( , ) In the formula, To be in control period The load fluctuation 95% quantile value calculated based on the data of the past 30 minutes.
9. The industrial park backflow prevention control method with the adjustable margin of the fusion source storage of claim 8, wherein, Based on, at a security level Average division of the energy storage power adjustable margin range into A layer of 1 +. The multiple is used as a layering adjustment value of the stored energy power.
10. The industrial park backflow prevention control method with the adjustable margin of the fusion source storage of claim 9, wherein, The adjustable margin range of the stored power (0, ], For the moment of time An adjustable drop in stored energy power; At a security level, when When the energy storage is less than or equal to 0, the discharge is stopped, when (0, When the energy storage is charged by the distributed power supply, and the charge quantity of the energy storage is controlled based on the layered regulation value of the energy storage power adjustable margin range; energy storage power adjustable margin range average division After the level, execute the first Before layer regulation, the adjustable margin range of the energy storage power is% , To (5) < ≤ The triggering condition for the stored energy to be charged, Is a reverse flow urgency index; = × / , =1,2,......, 。
11. the industrial park backflow prevention control method with the adjustable margin of the fusion source storage of claim 10, characterized in that, The stored energy performs a stop discharge operation or performs the first And after the hierarchical charging operation, updating the countercurrent urgency index according to the real-time data.
12. The industrial park backflow prevention control method with the adjustable margin of the fusion source storage of claim 10, characterized in that, The adjustable margin range of distributed power supply output (0, ], For the moment of time Adjustable drop of distributed power supply output; Under the early warning level, the device can detect the position of the user, (0, When the energy storage charging power is maximum in the park, the distributed power output is controlled based on the layered regulating value of the distributed power output, and the adjustable margin range of the distributed power output is equally divided into After the layer, execute the first The adjustable margin range of the distributed power supply output before layer adjustment is @ , To (5) < ≤ Triggering conditions for the power output down regulation of the distributed power supply; = × / , =1,2,......, 。
13. the industrial park backflow prevention control method with the adjustable margin of the fusion source storage of claim 12, wherein, At the action level, when (0, And (b) (0, And directly executing the operation of the distributed power supply cutting machine.
14. The industrial park backflow prevention control method with the adjustable margin of the fusion source storage according to claim 2, wherein, The net load power of the micro-grid at the current moment is calculated as shown in the following formula: = - In the formula, For the moment of time The net load power of the micro-grid, For the moment of time The load power of the micro-grid, For the moment of time First, the The operating state of the energy storage, The expression =1 indicates normal operation, =0 Indicates an abnormal operation, For the moment of time First, the The energy storage power is stored in the energy storage device, The amount of energy stored in the park; Updating grid-connected point power based on the net load power of the micro-grid at the current moment and an energy storage power instruction before anti-reflux control, wherein the power is shown in the following formula: = + In the formula, For the moment of time Grid-connected point power, Is the front first control for preventing reverse flow A stored energy power command; When the updated grid-connected point power And after the flow is not smaller than the set threshold value and the set duration is continued, judging that the industrial park microgrid has no countercurrent risk, ending the countercurrent control, and otherwise, continuously executing the countercurrent control.
15. An industrial park anti-reflux control system integrating source storage adjustable margin, which is used for realizing the industrial park anti-reflux control method integrating source storage adjustable margin according to any one of claims 1 to 14, and is characterized by comprising the following steps: the data monitoring module is used for monitoring the running data and running state of the distributed power supply and the energy storage in the industrial park and respectively evaluating the adjustable margin ranges of the output power and the energy storage power of the distributed power supply; the risk detection module is used for triggering the anti-reflux control module to start working when the industrial park micro-grid is detected to have the reflux risk, and triggering the anti-reflux control module to end working when the industrial park micro-grid is detected to have no reflux risk, wherein the risk level of the reflux is evaluated and comprises a safety level, an early warning level and an action level; The anti-backflow control module is used for establishing flexible control targets for layered adjustment of the adjustable margin ranges of the distributed power output and the energy storage power under different risk levels, calculating optimal power difference values between adjacent levels of the adjustable margin ranges of the distributed power output under different risk levels based on the flexible control targets in combination with the distributed power output climbing rate to determine layered adjustment values of the distributed power output under the early warning level and the action level, controlling energy storage charging based on the optimal power difference values between the adjacent levels of the adjustable margin ranges of the distributed power output under different risk levels and the micro-grid load fluctuation of an industrial park, calculating optimal power difference values between the adjacent levels of the adjustable margin ranges of the energy storage power under different risk levels to determine layered adjustment values of the energy storage power under the safety level, taking the difference value of a control threshold value of the safety level and the net load power of the micro-grid as a backflow urgency index, stopping discharging energy storage in the park if the counterflow urgency index is not greater than 0, controlling energy storage charging based on the layered adjustment values of the adjustable margin ranges of the energy storage power, and directly performing forced-charging of the distributed power control under the counterflow emergency power output level and the distributed power control device if the counterflow urgency index is not in the adjustable margin ranges.
16. A terminal comprises a processor and a storage medium, and is characterized in that: The storage medium is used for storing instructions; The processor being operative according to the instructions to perform the steps of the method of any one of claims 1-14.
17. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of the method according to any one of claims 1-14.

Description

Industrial park backflow prevention flexible control method and system integrating source storage adjustable margin Technical Field The invention belongs to the technical field of energy management and operation control of industrial and commercial parks, and particularly relates to an industrial park backflow prevention flexible control method and system integrating source storage adjustable margin. Background The source network charge storage integrated park project comprising the distributed power supply, the energy storage system and the flexible load is developed rapidly. The large commercial distributed photovoltaic uses full-rated self-power as a principle, and provides rigid requirements of 'forbidden reverse flow' for grid-connected power of a park, so that great challenges are brought to the collaborative operation of distributed power sources and energy storage multi-main power in the park. At present, the energy management system of the park focuses on long-time scale economic optimization of an hour level, a fifteen minute level and a five minute level, cannot cope with power fluctuation of the minute level or even the second level, and is difficult to ensure that grid-connected power is accurate in real time and not out of limit. The product at the operation control side relies on real-time power detection of units such as power generation, load and the like, and conventionally adopts a grid-connected point power tracking mode or a limited power operation mode, and the energy storage power instruction in the control mode is frequent to fluctuate, so that the energy storage response time is required to be very high, and the energy storage service life can be possibly influenced. For the on-site anti-backflow protection device, once the protection logic is triggered, the cutting operation is performed on the distributed power supply, so that the utilization efficiency of the distributed energy and the overall economic benefit of projects are seriously sacrificed. Therefore, the prior art system has obvious faults in control scale, response speed and adjustment mode. Disclosure of Invention In order to solve the defects in the prior art, the invention provides the industrial park backflow-preventing flexible control method and system integrating the source storage adjustable margin, which solve the problems that the existing control strategy is concentrated on minute-level power optimization, and the distributed power supply is directly cut off to influence the digestion index when the power pouring or protection control device is used for pouring short-time power cannot be avoided. The invention adopts the following technical scheme. The invention provides an industrial park backflow prevention control method integrating source storage adjustable margin, which comprises the following steps: Monitoring operation data and operation states of a distributed power supply and energy storage in an industrial park, and respectively evaluating adjustable margin ranges of output and energy storage power of the distributed power supply; When detecting that the industrial park micro-grid has a countercurrent risk, evaluating the countercurrent risk level, wherein the risk level comprises a safety level, an early warning level and an action level; Based on the flexible control target, combining the power ramp rate of the distributed power supply, calculating the optimal value of the power difference between adjacent levels of the power output adjustable margin range of the distributed power supply under different risk levels to determine the layered regulation value of the power output of the distributed power supply under the early warning level and the action level; Taking the difference value between the control threshold value of the safety level and the net load power of the micro-grid as a countercurrent urgency index; under the safety level, if the counter-current urgency index is not more than 0, stopping discharging energy stored in the park, if the counter-current urgency index is within the adjustable margin range of the energy storage power, controlling the energy storage charging based on the layered adjustment value of the adjustable margin range of the energy storage power; and when no countercurrent risk of the industrial park microgrid is detected, ending the countercurrent prevention control. Preferably, the power of the grid-connected point is monitored in real time, and when the power of the grid-connected point is smaller than a set threshold value, the micro-grid of the industrial park is judged to have the reflux risk; The net power of the grid-connected point is the difference value of the power of the grid-connected point and the energy storage power, and the risk level of countercurrent determined according to the net power of the grid-connected point comprises a safety level, an early warning level and an action level; Setting the countercurrent risk level as a safety level when th