Delayed immunity power equally-dividing method based on BPF

A power and active power technology, which is applied in the field of communication delay immune power equalization based on adaptive BPF, can solve communication delay and data packet loss and other problems

Inactive Publication Date: 2016-08-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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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 seconda

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  • Delayed immunity power equally-dividing method based on BPF
  • Delayed immunity power equally-dividing method based on BPF
  • Delayed immunity power equally-dividing method based on BPF

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Embodiment Construction

[0077] Below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail: present embodiment is carried out under the premise of technical solution of the present invention, provides detailed implementation mode and specific operation process, but protection scope of the present invention is not limited to the following the embodiment.

[0078] Such as figure 1 As shown, a BPF-based delayed immune power sharing method of the present invention specifically includes the following steps:

[0079] S1. Establish a medium-sized microgrid model with unbalanced resistance-inductive lines, and eliminate voltage amplitude and frequency drops caused by droop control through secondary control.

[0080] use as figure 1 The circuit structure diagram of a medium-sized microgrid under an unbalanced resistive-inductive line is shown, including multiple parallel DG units and the line impedance, load unit and static switch of each DG unit connected ...

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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...

Claims

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Application Information

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IPC IPC(8): H02J3/46
CPCH02J3/381H02J3/388H02J3/46H02J2203/20
Inventor 韩杨李红沈攀杨平熊静琪
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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