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Phase locking method based on nonlinear PI and decoupling double synchronous coordinate system phase-locked loop

A non-linear, coordinate system technology, applied in the phase-locked field based on nonlinear PI and decoupling dual synchronous coordinate system phase-locked loop, can solve the problems affecting the tracking speed and stability of the phase-locked loop, and achieve good tracking effect , the effect of high control accuracy, good rapidity and stability

Active Publication Date: 2018-09-28
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

PI control is a simple proportional-integral linear combination, the rapidity is determined by the proportional parameter, and the stability is determined by the integral constant, which makes the rapidity and robustness contradictory, which will affect the rapidity and stability of the phase-locked loop tracking
The positive and negative sequence cascade delay signal elimination method is adopted, which can realize the rapid extraction of the positive and negative sequence components of the three-phase voltage and current fundamental wave under synchronous rotating coordinates, but different algorithms need to be designed for different harmonics

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  • Phase locking method based on nonlinear PI and decoupling double synchronous coordinate system phase-locked loop
  • Phase locking method based on nonlinear PI and decoupling double synchronous coordinate system phase-locked loop
  • Phase locking method based on nonlinear PI and decoupling double synchronous coordinate system phase-locked loop

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[0021] The phase-locking method based on the nonlinear PI and the phase-locked loop of the decoupled double synchronous coordinate system, firstly, the grid-side voltage detection signal v in the three-phase static coordinate system a , v b , v c Transformed into the voltage v in the two-phase stationary coordinate system α , v β , and then according to the estimated grid angle put the voltage v α , v β Convert to DC voltage v d , v q , which is divided into positive-sequence DC component and negative-sequence DC component, when transformed into DC flow, it contains two rotating coordinate systems, positive sequence dq n Coordinate system with angular velocity Rotate counterclockwise with an angle of Negative sequence dq m Coordinate system with angular velocity Rotate clockwise, the angle is In the closed-loop structure of the phase-locked loop, by adjusting the parameters of the PI controller, the It can be assumed that: It can be obtained that both the ...

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Abstract

The invention relates to a phase locking method based on nonlinear PI and a decoupling double synchronous coordinate system phase-locked loop. Based on the decoupling double synchronous coordinate system phase-locked loop, a nonlinear function is added for changing parameters of a PI controller, so that tracking effect is improved, and rapidity and stability are better; meanwhile, for second harmonics caused by negative sequence voltage, a specific frequency point wave trap is introduced for eliminating the harmonics, so that harmonic eliminating performance is improved on the basis of decoupling and harmonic eliminating. The phase locking method can be used for realizing detection on phases and frequencies of a power grid in different states, is applicable to solar energy and wind power new energy grid-connected power generation systems and can be popularized into a control method for other single phase or three-phase grid-connected inverters.

Description

technical field [0001] The invention relates to a power signal acquisition technology, in particular to a phase-locking method based on a nonlinear PI and decoupling double synchronous coordinate system phase-locked loop. Background technique [0002] Phase-locked loop is one of the extremely important technologies in the process of connecting new energy to the grid. As an important way of new energy power generation, photovoltaic power generation plays an important role in alleviating the energy crisis and reducing environmental pollution. Photovoltaic inverter grid-connected power generation must track the phase, amplitude and frequency of the grid voltage, that is, phase-locked loop technology. However, large-scale photovoltaic grid-connected power generation systems are generally built in remote areas, which requires adapting to non-ideal grid environments, such as voltage drops, phase mutations, frequency changes, negative sequence voltage, and harmonic pollution. In ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/40H02J3/38
CPCH02J3/383H02J3/386H02J3/40Y02E10/56Y02E10/76
Inventor 杨旭红吴斌孙克帅尹聪聪张云飞陈昊刘洋
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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