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Orthogonal filter-based inverter non AC voltage sensor control method

A technology of quadrature filter and AC voltage, applied in the control field of three-phase grid-connected inverter, can solve problems such as zero drift, steady-state error, initial value sensitivity, etc.

Active Publication Date: 2014-11-19
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0008] The purpose of the present invention is to overcome the problems of zero point drift, integral saturation, steady-state error and initial value sensitivity that may exist in the existing inverter without AC voltage sensor control, and propose a three-phase grid-connected inverter based on quadrature filter Transformer without AC voltage sensor control method

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  • Orthogonal filter-based inverter non AC voltage sensor control method
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  • Orthogonal filter-based inverter non AC voltage sensor control method

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] Compared with the conventional three-phase grid-connected inverter control method, the AC voltage sensor-free control method of the present invention does not use an AC voltage sensor, but uses a voltage observer based on an orthogonal filter to obtain grid voltage information, and realizes no AC voltage Inverter operation control under sensor conditions.

[0020] The present invention first constructs an orthogonal filter based on a second-order generalized integrator (SOGI), and then constructs a grid voltage observer based on the orthogonal filter, and applies the voltage observer to a three-phase grid-connected inverter in two-phase In the PR controller in the static coordinate system, the AC voltage sensorless control of the inverter is realized.

[0021] The voltage observer can be derived according to the model of the three-phase...

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Abstract

The invention discloses an orthogonal filter-based inverter non AC voltage sensor control method. The method comprises steps: a second-order generalized integrator is firstly used for constructing an orthogonal filter according to no difference following characteristics of specific-frequency AC signals; the orthogonal filter is then used for constructing a voltage observer of a three-phase grid-connected inverter, in a two-phase stationary coordinate system, grid side current signals obtained after measurement and voltage reference signals at an inverter controller output bridge end serve as input of the voltage observer for carrying out observation on the grid voltage; and in combination with PR control of the three-phase grid-connected inverter in the two-phase stationary coordinate system, operation control on the inverter in the condition of non AC voltage sensor can be realized. Due to the method, in the condition of ensuring control stability of the inverter, integral saturation, initial value sensitivity, static error and other problems possibly appearing during the conventional non AC voltage sensor control can be avoided, and the method has the advantages of being quick, free of static errors and insensitive to the initial value.

Description

technical field [0001] The invention relates to a control method of a three-phase grid-connected inverter. Background technique [0002] The renewable energy grid-connected power generation system has developed rapidly in recent years. When it is connected to the end of the grid or the distribution network with a weak grid structure, there may be a small short-circuit capacity of the grid-connected point, poor stability of the grid, and serious problems in the grid. Problems such as voltage fluctuations, flicker, symmetrical or asymmetrical voltage drop faults, etc. The intermittence and randomness of renewable energy itself may further deteriorate the voltage stability of the connected power system, and in turn affect its own stable operation. In order to realize the grid-connected power and current control of renewable energy generation systems, the existing grid-connected converters or inverters generally use phase-locked loops to obtain grid voltage information, but thi...

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Application Information

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IPC IPC(8): H02J3/38
Inventor 胡书举龚文明
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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