CN-122000889-A - Trusted capacity range assessment method for new energy unit

CN122000889ACN 122000889 ACN122000889 ACN 122000889ACN-122000889-A

Abstract

The application discloses a trusted capacity range assessment method of a new energy unit, which relates to the technical field of computers and comprises the steps of determining a target index value by utilizing a system load of an electric power system, a conventional unit output and a preset reliability index assessment function after starting simulation analysis of the electric power system based on preset trusted capacity range assessment time, determining a trusted capacity upper limit value of the electric power system after being connected with the new energy unit based on the target index value, a first preset function, a virtual generator output state and the new energy unit output, comparing the target index value with a preset index threshold value to judge whether the trusted capacity lower limit analysis is triggered currently or not, determining a trusted capacity lower limit value based on a second preset function and a virtual generator output state if the trusted capacity lower limit analysis is triggered, and determining a trusted capacity range assessment result based on the trusted capacity upper limit value and the trusted capacity lower limit value. The application improves the comprehensiveness and the accuracy of the credible capacity assessment and the decision reliability based on the credible capacity.

Inventors

LI ZUYI
YAN LEI
LIN ROUYU
LV JUNBANG
HUANG KUI

Assignees

浙江大学

Dates

Publication Date: 20260508
Application Date: 20260410

Claims (10)

1. The method for evaluating the trusted capacity range of the new energy unit is characterized by comprising the following steps of: After simulation analysis of the power system is started based on the preset credible capacity range evaluation duration, determining a target index value corresponding to the power system by utilizing a system load corresponding to the power system, conventional unit output and a preset reliability index evaluation function, wherein the preset reliability index evaluation function is used for evaluating the load loss probability of the power system; determining a reliable capacity upper limit value of the electric power system after the electric power system is connected with a new energy unit based on the target index value, the preset reliable capacity range evaluation duration, a first preset function, a virtual generator output state and the new energy unit output, wherein the first preset function is a function obtained by performing explicit optimization on an inverse function of the preset reliability index evaluation function; Comparing the target index value with a preset index threshold value, and judging whether to trigger the credible capacity lower limit analysis operation currently based on a corresponding index comparison result so as to determine an operation triggering judgment result; If the operation triggering judgment result is yes, determining a lower limit value of the credible capacity of the power system after the power system is connected with the new energy unit based on a second preset function, the output state of the virtual generator and the output of the new energy unit, wherein the second preset function is an inverse function of the preset reliability index evaluation function, and is obtained after explicit optimization; and determining a trusted capacity range evaluation result based on the trusted capacity upper limit value and the trusted capacity lower limit value.
2. The method for evaluating the trusted capacity range of the new energy unit according to claim 1, wherein the starting the simulation analysis of the power system based on the preset trusted capacity range evaluating time period comprises: Selecting target operation data with corresponding time length from a system history operation database corresponding to the power system based on the preset credible capacity range evaluation duration; and based on the target operation data, performing simulation of the power system to obtain a system load and a conventional unit output corresponding to the power system.
3. The method for evaluating the trusted capacity range of a new energy unit according to claim 1, wherein the determining the target index value corresponding to the power system by using the system load, the conventional unit output and the preset reliability index evaluation function corresponding to the power system comprises: Selecting target operation data with corresponding time length from a system history operation database corresponding to the power system based on the preset credible capacity range evaluation duration; Based on the target operation data, performing simulation of the power system to obtain a system load and a conventional unit output corresponding to the power system; And inputting the system load corresponding to the power system and the conventional unit output to a preset reliability index evaluation function to determine a target index value corresponding to the power system, wherein the target index value is an index value before the power system is connected to a new energy unit.
4. The method for evaluating the trusted capacity range of the new energy unit according to claim 1, wherein determining the trusted capacity upper limit value of the power system after being connected to the new energy unit based on the target index value, the preset trusted capacity range evaluating time, a first preset function, a virtual generator output state, and the new energy unit output comprises: Taking the target index value as an index value after the electric power system is connected with a new energy unit; Configuring a virtual generator output state as a load loss indicating variable of the power system, wherein the virtual generator output state comprises a virtual generator output and a virtual generator start-stop state variable; and analyzing the effective load capacity of the power system after being connected to the new energy unit based on the target index value, the virtual generator output, the virtual generator start-stop state variable, the preset credible capacity range evaluation duration, the preset constant, the new energy unit output and the first preset function so as to determine the credible capacity upper limit value.
5. The method for evaluating the trusted capacity range of a new energy unit according to claim 4, wherein said configuring the virtual generator output state as the load loss indication variable of the power system comprises: And if the value of the start-stop state variable of the virtual generator is a first preset value and the output of the virtual generator at the corresponding moment is zero, indicating that no load loss occurs in the power system.
6. The method for evaluating the trusted capacity range of a new energy unit according to claim 4, wherein said configuring the virtual generator output state as the load loss indication variable of the power system comprises: And if the value of the start-stop state variable of the virtual generator is a second preset value and the output of the virtual generator at the corresponding moment is greater than zero, indicating that the power system is in a load loss state.
7. The method for evaluating the trusted capacity range of a new energy unit according to any one of claims 1 to 6, wherein the comparing the target index value with a preset index threshold value and determining whether to trigger the trusted capacity lower limit analysis operation currently based on the corresponding index comparison result to determine an operation trigger determination result includes: judging whether the target index value is larger than a preset index threshold value or not to determine an index comparison result; and if the index comparison result shows that the index comparison result is larger than the index comparison result, judging that the current operation is triggered by the credible capacity lower limit analysis operation so as to obtain a first operation triggering judgment result.
8. The method for evaluating the trusted capacity range of a new energy unit according to claim 7, wherein after the determining the index comparison result, further comprises: and if the index comparison result indicates that the index comparison result is equal to the index comparison result, judging that the credible capacity lower limit analysis operation is not triggered currently so as to obtain a second operation triggering judgment result.
9. The method for evaluating the trusted capacity range of the new energy unit according to claim 8, wherein after the second operation trigger judgment result is obtained, further comprising: And determining the upper limit value of the trusted capacity as the evaluation result of the trusted capacity range.
10. The method for evaluating the trusted capacity range of the new energy unit according to claim 1, wherein the determining the lower limit value of the trusted capacity of the power system after the power system is connected to the new energy unit based on the second preset function, the output state of the virtual generator, and the output of the new energy unit comprises: determining an updated index value based on the target index value and the preset trusted capacity range evaluation duration; And analyzing the effective load capacity of the power system after the power system is connected to the new energy unit based on the updated index value, the output state of the virtual generator, the output of the new energy unit and a second preset function so as to determine a lower limit value of the trusted capacity.

Description

Trusted capacity range assessment method for new energy unit Technical Field The invention relates to the technical field of computers, in particular to a method for evaluating a trusted capacity range of a new energy unit. Background When the lol (Loss of Load Probability, load loss probability) is used as the reliability index, the solution of the trusted capacity is sometimes not unique but an arbitrary value in one interval due to the discrete value of the lol. Moreover, the existing credible capacity assessment scheme is an implicit iteration scheme, the scheme cannot directly calculate the credible capacity of the power system under the given reliability condition, but continuously searches the credible capacity until a certain turn takes account of the consistency of the reliability index values of the power system before and after the new energy is accessed, outputs a credible capacity value, and terminates the iteration. That is, the efficiency, accuracy and comprehensiveness of the solution are low, and if only one feasible solution of the trusted capacity is obtained, the iteration is exited, so that a specific boundary value of the trusted capacity interval cannot be obtained. Disclosure of Invention Therefore, the invention aims to provide the credible capacity range assessment method of the new energy unit, which can effectively obtain the boundary value of the credible capacity range, thereby improving the efficiency, the comprehensiveness and the accuracy of the credible capacity assessment, and further improving the decision reliability and the data visualization effect based on the credible capacity. The specific scheme is as follows: The application provides a method for evaluating the credible capacity range of a new energy unit, which comprises the following steps: After simulation analysis of the power system is started based on the preset credible capacity range evaluation duration, determining a target index value corresponding to the power system by utilizing a system load corresponding to the power system, conventional unit output and a preset reliability index evaluation function, wherein the preset reliability index evaluation function is used for evaluating the load loss probability of the power system; determining a reliable capacity upper limit value of the electric power system after the electric power system is connected with a new energy unit based on the target index value, the preset reliable capacity range evaluation duration, a first preset function, a virtual generator output state and the new energy unit output, wherein the first preset function is a function obtained by performing explicit optimization on an inverse function of the preset reliability index evaluation function; Comparing the target index value with a preset index threshold value, and judging whether to trigger the credible capacity lower limit analysis operation currently based on a corresponding index comparison result so as to determine an operation triggering judgment result; If the operation triggering judgment result is yes, determining a lower limit value of the credible capacity of the power system after the power system is connected with the new energy unit based on a second preset function, the output state of the virtual generator and the output of the new energy unit, wherein the second preset function is an inverse function of the preset reliability index evaluation function, and is obtained after explicit optimization; and determining a trusted capacity range evaluation result based on the trusted capacity upper limit value and the trusted capacity lower limit value. Optionally, the step of starting simulation analysis on the power system based on the preset trusted capacity range evaluation duration includes: Selecting target operation data with corresponding time length from a system history operation database corresponding to the power system based on the preset credible capacity range evaluation duration; and based on the target operation data, performing simulation of the power system to obtain a system load and a conventional unit output corresponding to the power system. Optionally, determining the target index value corresponding to the power system by using the system load, the conventional unit output and the preset reliability index evaluation function corresponding to the power system includes: And inputting the system load corresponding to the power system and the conventional unit output to a preset reliability index evaluation function to determine a target index value corresponding to the power system, wherein the target index value is an index value before the power system is connected to a new energy unit. Optionally, the determining the trusted capacity upper limit value after the power system is connected to the new energy unit based on the target index value, the preset trusted capacity range evaluation duration, the first preset function, the virtual generator output