Voltage flicker detecting and control method based on battery energy storage system

Abstract

The invention provides a voltage flicker detecting and control method based on battery energy storage system; the method comprises the steps: step (1) acquiring a single-phase voltage signal at a PCC (Program-controlled Computer) and changing the phase to obtain three-phase voltage and current signals; step (2), transforming the three-phase voltage and current signals obtained in the step (1) and obtaining instant active power and reactive power; step (3), filtering the obtained instant active power and extracting a DC component to calculate a voltage flicker enveloping signal; step (4) calculating voltage flicker parameters, including an amplitude value and a frequency; and step (5) solving a compensation command of the battery energy storage system and compensating active and reactive power to public nodes. The provided voltage flicker detecting and control method is capable of accurately detecting the corresponding parameters of the voltage flicker; the calculation method is simple and the engineering is easy in realization. The battery energy storage system is applied to a power distribution network to compensate the voltage flicker; in combination of the provided control method, the active and reactive power can be compensated at the same time and the voltage flicker in the power distribution network is restrained effectively.

Description

technical field [0001] The invention relates to a compensation control method, in particular to a voltage flicker detection control method based on a battery energy storage system. Background technique [0002] The irregularity of the load causes the voltage fluctuation of the public access point in the distribution network, and the voltage fluctuation with a frequency between 1-10Hz becomes voltage flicker. Voltage flicker will cause the efficiency of electrical equipment to drop, cause torque and power oscillations, and even affect the protection system, which is relatively harmful to the power grid, so it needs to be detected and compensated. [0003] Currently commonly used voltage flicker detection methods include half-wave effective value method, square demodulation method, full-wave rectification method, etc., but the effects of these methods are not ideal. The synchronization signal detection method based on wavelet multi-resolution decomposition can improve the det...

AI Technical Summary

Problems solved by technology

[0004] In the compensation method of voltage flicker, the traditional reactive power compensation device SVC has a slow response speed and the effect is not ideal

Using STATCOM to suppress voltage flicker can achieve a better suppression effect, but in a distribution network with relatively large impedance, only compensating reactive power cannot effectively suppress voltage flicker, and a certain amount of active power still needs to be compensated

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