Emergency frequency control method considering resource action speed and system

Abstract

The invention provides an emergency frequency control method considering a resource action speed and system. The method comprises steps: the system excess power which needs to be removed after a highfrequency fault is determined; based on a pre-constructed active power action speed model, the maximum effective active power action amount for removing the system excess power by emergency frequencycontrol resources in an action time is calculated; and the maximum effective active power action amount and the system excess power are calculated, an emergency high frequency control strategy considering the resource action speed is made, and a corresponding strategy is adopted to control the system frequency to be in a target control peak value range. Through the above scheme, the resource equivalent active power removal amount which is needed for controlling the peak frequency of the system under the high frequency fault is calculated accurately, multiple resources are coordinated to participate in the emergency frequency control of the system, and the economic and action speed characteristics of different resources are considered, so as to achieve the best emergency frequency control effect of the whole system.

Description

technical field [0001] The invention belongs to the technical field of electric power system automation, and in particular relates to an emergency frequency control method and system considering resource action speeds. Background technique [0002] With the rapid development of the power system, more and more resources are integrated into the grid for operation, and the grid structure and its operation mode are becoming more and more complex. Due to its low impact on the environment, low cost of power generation, rapid technological development and significant economies of scale, wind energy resources have become the fastest growing renewable energy and have begun large-scale grid-connected operations. High-voltage direct current (HVDC) transmission technology has irreplaceable advantages in fast controllability, large-scale, long-distance power transmission, etc., and it has developed rapidly in power transmission. Therefore, the power grid including wind power and DC has ...

AI Technical Summary

Problems solved by technology

Major faults in the power system will lead to large fluctuations in system frequency, generator tripping, and system disconnection, which will affect the safe and stable operation of the system. At this time, emergency control measures must be taken to stabilize the system frequency

At the same time, in the current power system, the resources that can participate in emergency frequency control are gradually diversified, such as thermal power units, wind turbines, HVDC, etc., but the frequency modulation performance of different frequency modulation resources is different

[0004] At present, there are many studies on the effect of the amount, rounds, and locations of machine cut-offs on the emergency control of the system, how DC participates in multi-circuit emergency power support, and the effect of fast valve closing on emergency control. However, the actions of emergency control resources There are few studies on speed characteristics, designing emergency control strategies and coordinating multiple resources to participate in emergency frequency control of the system.

Images