Control method for damping low-frequency oscillation of power system based on energy storage power supply

Abstract

The invention discloses a control method for damping low-frequency oscillation of a power system based on an energy storage power supply. The control method comprises the following steps: constructing an active damping controller and a fuzzy controller; enabling the active damping controller to take a far-end oscillation signal acquired by the wide-area measurement system as input, and introducing a path of time delay fuzzy input to judge the size of time delay; enabling the fuzzy controller to select a corresponding fuzzy rule according to the size of the time delay, and provides control output with the same phase as the far-end oscillation signal; and according to the time-delay stability margin analysis data, adjusting the gain of the active damping controller, adjusting the active output of the energy storage power supply, and suppressing the power angle of the generator or the frequency oscillation of the system. According to the control method, the fuzzy rule can be dynamically adjusted according to the time delay, the damping ratio of the system is improved as much as possible while the feedback signal time delay is compensated, the control effects of the controller under different time delays are basically the same, the good time delay robustness is achieved, and time delay compensation and damping control are considered.

Description

technical field [0001] The invention relates to the technical field of power system oscillation damping, in particular to a control method for damping low-frequency oscillations of power systems based on energy storage power sources. Background technique [0002] The expansion of the grid scale will reduce its overall damping characteristics to a certain extent, which will increase the risk of low-frequency oscillation. Once the large and continuous low-frequency oscillation occurs in the AC system, it must be accompanied by large synchronous fluctuations in transmission power and voltage, which will threaten the safe and stable operation of the entire power system. Therefore, it is the focus of power system research to study the oscillation damping and control strategy of the power system to reduce the risk of low-frequency oscillation of the power grid. [0003] In recent years, electrochemical energy storage technology has become more and more mature, and it is developin...

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly solves the technical problem that the original control method cannot take into account delay compensation and damping control; it provides a control method based on energy storage power supply damping power system low-frequency oscillation, which can dynamically adjust the fuzzy rules according to the delay, and compensate the feedback signal At the same time as time delay, improve the damping ratio of the system as much as possible, so that the control effect of the controller is basically the same under different time delays, and there is no need to sacrifice part of the control performance to compensate for time delays. It has good time-delay robustness and takes into account Delay Compensation and Damping Control

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