A BPF-Based Time-Delayed Immune Power Sharing Method

Abstract

The invention discloses a delay immune power equalization method based on a band-pass filter (BPF). The method of the invention further derives the BPF-based method by establishing an equivalent secondary control model without communication lines. The micro-grid small-signal model obtains adaptive high-pass filter coefficients and optimized droop coefficients, thereby enhancing the voltage amplitude and frequency dynamic stability of each distributed generation (DG). While ensuring that the voltage amplitude and frequency are stable at the rated value, the accurate equalization of active power under unbalanced resistance-inductive lines is realized. The beneficial effect of the method of the present invention is that, based on the traditional droop control scheme, the problems of voltage amplitude and frequency drop and communication delay caused by droop control can be quickly and accurately eliminated without introducing bandwidth communication lines and additional control loop conditions, and the voltage can be enhanced. The dynamic stability of amplitude and frequency realizes the accurate equalization of active power and ensures the efficient and stable operation of the microgrid.

Description

technical field [0001] The invention belongs to the field of microgrids in the energy internet, and relates to a microgrid power sharing method based on a band-pass filter (BPF), in particular to a communication delay immune power sharing method based on 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 co...

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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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