Method for considering influence of wind power and load characteristics on power system

Abstract

The invention provides a method for considering the influence of wind power and load characteristics on a power system. The method comprises the steps of establishes a VSC-HVDC AC/DC system model thatconsiders the wind power and load characteristics, an AC and DC continuous power flow model that considers the wind power and load characteristics, and a voltage stability risk indicator, calculatingrisk indicators in different scenarios by using an improved Monte Carlo simulation method to obtain weak points of the system, and analyzing voltage stability risks under different wind power penetration rates and VSC control methods. According to the method, the influence of wind power randomness and load characteristics on system voltage stability are fully considered, the risk indicators whichintegrate voltage changes and load margin changes are proposed, a weak area of the system is determined by using the indicators, the voltage risk values in different scenarios are evaluated by changing wind power permeability and DC control parameters, the accuracy of an AC system AC and DC voltage stability risk assessment result is greatly improved, and a reference can be provided for guiding the stable operation of the system.

Description

technical field [0001] The invention relates to an AC / DC voltage stability risk assessment method considering the influence of wind power and load characteristics on a power system, and belongs to the technical field of power transmission and distribution. Background technique [0002] As the penetration rate of new energy continues to increase, the stability of the power system is affected by various uncertain factors. In recent years, my country's wind farm construction has developed rapidly, and many have been put into operation. Because wind farms are greatly affected by natural conditions and have the characteristics of randomness, intermittentness, and uncertainty, the output power of wind power also changes with changes in the environment, which brings great challenges to the stable operation and optimal dispatch of the power system. Many questions. Therefore, it is of great significance to improve the operational reliability of the power system to consider the impa...

AI Technical Summary

Problems solved by technology

However, the currently established risk indicators suitable for establishing weak areas of the system are relatively single, and cannot fully reflect the situation of voltage stability, resulting in inaccurate results obtained by the evaluation method. Therefore, it is necessary to establish a new risk indicator based on voltage changes and load margin changes. The key to identifying weak areas

The traditional continuous power flow only considers the influence of constant power load changes on voltage stability, but the actual load characteristics are more complex, and a single load type cannot satisfy the stability analysis of large-scale AC and DC systems. Therefore, multiple load characteristics and different DC control are considered. parameter allows for a more comprehensive assessment of the impact on voltage stability

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