Control method of inverter without AC voltage sensor based on quadrature filter

A technology of orthogonal filter and control method, which is applied in the direction of single-network parallel feeding arrangement, etc., and can solve problems such as integral saturation, steady-state error, and zero-point drift

Active Publication Date: 2016-11-30
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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  • Control method of inverter without AC voltage sensor based on quadrature filter
  • Control method of inverter without AC voltage sensor based on quadrature filter
  • Control method of inverter without AC voltage sensor based on quadrature filter

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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

A quadrature filter-based inverter control method without an AC voltage sensor. Firstly, the quadrature filter is constructed by using the second-order generalized integrator’s non-difference following characteristic of the specific frequency AC signal, and then the voltage observer of the three-phase grid-connected inverter is constructed by using the quadrature filter, in the two-phase stationary coordinate system , using the measured grid side current signal and the inverter controller output bridge terminal voltage reference signal as the input of the voltage observer to observe the grid voltage; combined with the three-phase grid-connected inverter in the two-phase static coordinate system The PR control realizes the operation control of the inverter under the condition of no AC voltage sensor. This method can avoid problems such as integral saturation, initial value sensitivity, and static error that may occur in conventional no-AC voltage sensor control while maintaining the stability of inverter control. and other advantages.

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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Patent Type & Authority Patents(China)
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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