Delayed immunity power equally-dividing method based on BPF

Abstract

The invention discloses a delayed immunity power equally-dividing method based on band-pass filter (BPF). According to the method, by establishing an equivalent secondary control model without a communication line and further deducing a micro-grid small-signal model based on the BPF, a self-adaption high-pass filter coefficient and an optimal droop coefficient are obtained, and therefore the voltage amplitude and frequency dynamic stability of all distributed type generations (DG) are enhanced. The voltage amplitude and the frequency stability are kept at rationed values, and precise equal division of active powder under unbalanced resistance-inductance circuits is achieved. The method has the advantages that on the basis of a traditional droop control scheme, the voltage amplitude and frequency drop problem and the communication delayed problem caused by droop control are rapidly and accurately eliminated without introducing a wideband communication line or an additional control ring, the dynamic stability of the voltage amplitude and frequency is enhanced, the precise equal division of active power is achieved, and efficient and stable running of a micro-grid is ensured.

Description

technical field [0001] The invention belongs to the field of microgrids in the energy Internet, and relates to a power equalization method based on a band-pass filter (BPF), in particular to a communication delay immune power equalization method based on an adaptive BPF. Background technique [0002] Due to the vigorous development of the energy Internet, especially in the large-scale investment of new energy such as wind power generation and photovoltaic power generation, the use of non-traditional master-slave control and centralized non-interconnected droop control strategy has become the mainstream trend of micro-grid stable operation control . However, droop control will cause the voltage amplitude and frequency of the microgrid to drop, and in severe cases, it will also affect the stability of the microgrid operation. The voltage amplitude and frequency deviation caused by droop control can be eliminated by using the secondary control strategy based on low-bandwidth c...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of voltage amplitude and frequency offset caused by current droop control of microgrid and communication delay and data packet loss caused by secondary control, and propose a delay immune control algorithm based on BPF , while ensuring that the voltage amplitude and frequency of the microgrid are always running at the rated value, it can achieve accurate power sharing

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