Micro-grid inverter voltage and current double-ring hanging control method based on virtual impedance

A technology of virtual impedance and control method, which is applied in the direction of electrical components, circuit devices, emergency power supply arrangements, etc., can solve problems such as the inability to work stably in parallel inverter systems, and achieve fast dynamic response, high flexibility and redundancy , High stability effect

Active Publication Date: 2012-06-20
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantage that the traditional power droop control method cannot make the parallel inverter system work stably when the line impedance

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  • Micro-grid inverter voltage and current double-ring hanging control method based on virtual impedance
  • Micro-grid inverter voltage and current double-ring hanging control method based on virtual impedance
  • Micro-grid inverter voltage and current double-ring hanging control method based on virtual impedance

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Example Embodiment

[0024] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0025] The equivalent circuit diagram of the parallel operation of two inverters in the microgrid is as follows figure 1 Shown. The output impedance of each inverter And connection impedance Sum is The output voltage of each inverter is The output current is I on (n=1, 2), the circulating current between the two inverters is I H , The voltage at the common coupling point is

[0026] The steps of adopting the control method of the present invention are as follows:

[0027] Step 1. The inverter output voltage is generated with reference to the given signal

[0028] The output voltage of each inverter in the parallel inverter system is determined by using a synchronous rotating phase-locked loop Perform phase lock to get the phase angle of the inverter output voltage Phase angle And inverter output voltage reference amplitude Synthesize inverter output volt...

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Abstract

The invention relates to a micro-grid inverter voltage and current double-ring hanging control method based on virtual impedance. Compared with a three-ring power hanging control, the micro-grid inverter voltage and current double-ring hanging control method based on virtual impedance comprises the steps that: inverter virtual connection impedance Zvir(s) is serially connected between the output current and the reference voltage signals of an inverter; the inverter virtual connection impedance Zvir(s) is equivalent to be a hanging coefficient, so that the output current of the inverter is fed back to the output voltage of the inverter through the virtual connection impedance to be fixed, and further, the purpose of automatically splitting the load power of a parallel inverter system is achieved. The micro-grid inverter voltage and current double-ring hanging control method based on virtual impedance eliminates the defects that a traditional three-ring power hanging controller is sensitive to the connection impedance and the control system is complicated, so that the parallel distributed power supplies in a micro-grid can still realize good power splitting effect when the circuit is short and the impedance is small, the stable margin of the system is improved, and the power supply quality of the loads is ensured.

Description

technical field [0001] The invention relates to a control method of a micro-grid inverter, in particular to a method for controlling voltage and current double-loop droop of a micro-grid inverter based on virtual impedance. Background technique [0002] In recent years, micro-grid technology based on renewable energy has become an important part of the national energy-saving emission reduction and sustainable development strategy planning due to its high efficiency, economy, flexible location and decentralized characteristics. The microgrid can be connected to the distribution network and work in grid-connected mode, or it can supply power to local loads alone, that is, it can operate in island mode. When the microgrid operates in an isolated island, the control performance of the inverter will directly affect the power supply quality of the load. The common control methods can generally be divided into two categories. [0003] The first category is the interconnection met...

Claims

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Application Information

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IPC IPC(8): H02J9/00H02J3/38H02J3/46
Inventor 关雅娟王一波杨子龙许洪华
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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