Operation control method for combined three-phase inverter

A three-phase inverter, operation control technology, applied in the direction of reducing the asymmetry of the polyphase network, eliminating/reducing the asymmetry of the polyphase network, etc., can solve the problem of difficult output voltage and so on

Inactive Publication Date: 2015-07-22
GUANGDONG YUANJING ENERGY
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Problems solved by technology

[0005] However, in the parallel operation of combined three-phase inverters based on droop control, how to control the symmetry of the inverter output voltage under the three-phase unbalanced load is a difficult point, so it is necessary to design a reasonable control method

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  • Operation control method for combined three-phase inverter
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  • Operation control method for combined three-phase inverter

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Embodiment Construction

[0041] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0042] A combined three-phase inverter operation control method of the present invention is based on a combined three-phase inverter circuit structure, the specific structure is as follows figure 1As shown, it includes the a-phase full-bridge inverter circuit composed of four switches Sa1~Sa4, the b-phase full-bridge inverter circuit composed of four switches Sb1~Sb4, and the c-phase full-bridge inverter circuit composed of four switches Sc1~Sc4. bridge inverter circuit, via L x 、C x (x=a, b, c) After the filter circuit is output through the transformer according to the three-phase four-wire. All Phases X x (x=a, b, c, N) After the line impedance is connected to the low-voltage three-phase four-wire public AC bus. Each single-phase load or three-phase load is connected to the common AC bus. The load can be a linear load consisting of res...

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Abstract

The invention discloses an operation control method for a combined three-phase inverter. The operation control method includes steps of acquiring three-phase filter capacitive voltage and three-phase filter inductive current signals of the inverter; computing the average power of voltage values and current values of various phases to obtain the output average active power and output reactive power of the various phases and acquiring output three-phase voltage reference values via a droop controller; subtracting corresponding output phase voltages of the inverter from the output voltage reference values of the various phases to obtain voltage errors of the various phases; regulating the voltage errors of the various phases by the aid of a voltage regulator to generate modulation signals and modulating the modulation signals by the aid of a modulation module to generate switch control signals. The operation control method for the combined three-phase inverter has the advantage that the symmetry of the output three-phase voltages of the inverter can be guaranteed in off-grid operation modes of micro-grids when three-phase loads are unbalanced.

Description

technical field [0001] The invention belongs to the technical field of distributed power generation under microgrid off-grid mode, and relates to an operation control method of a combined three-phase inverter. Background technique [0002] In recent years, due to the shortage of energy and serious environmental pollution, the development of microgrids has been highly valued in countries all over the world. A microgrid is a small-scale power generation, distribution, and power consumption system composed of distributed power sources, energy storage systems, energy conversion devices, monitoring and protection devices, and loads. It can be connected to the grid or isolated. An important part of the microgrid is the distributed power supply. The distributed power supply has many advantages, such as: it helps to improve the acceptance capacity of the distribution system for the distributed power supply; it can effectively improve the utilization efficiency of intermittent renewa...

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Application Information

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IPC IPC(8): H02J3/26
CPCY02E40/50H02J3/26
Inventor 任碧莹赵欣荣孙向东张琦
Owner GUANGDONG YUANJING ENERGY
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