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Phase-locked control method for zero-voltage ride through of photovoltaic grid-connected inverter

A zero-voltage ride-through and control method technology, which is applied in photovoltaic power generation, climate change adaptation, single-network parallel feeding arrangement, etc., can solve problems such as phase-locked control and zero-voltage drop, and avoid current disorder and impact, phase Continuing and improving the effect of grid adaptability

Active Publication Date: 2015-09-23
XUJI GRP +4
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a zero-voltage ride-through phase-locked control method for photovoltaic grid-connected inverters to solve the problem that phase-locked control cannot be achieved during zero-voltage dips

Method used

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  • Phase-locked control method for zero-voltage ride through of photovoltaic grid-connected inverter
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  • Phase-locked control method for zero-voltage ride through of photovoltaic grid-connected inverter

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0016] The main circuit of the photovoltaic grid-connected inverter is as follows: figure 1 As shown in the upper part, it includes DC bus support capacitor, three-phase half-bridge power circuit, LCL filter circuit, etc.

[0017] The control structure of photovoltaic grid-connected inverter based on positive and negative sequence dual synchronous coordinate system is as follows: figure 1 As shown in the lower part, the whole is a double closed-loop control of the DC voltage outer loop and the current inner loop. The outer loop voltage command is calculated by MPPT, and the current inner loop uses 4 sets of independent controllers. The output current of the bridge arm is decomposed by the double synchronous coordinate system are the positive and negative sequence d and q axis components (i.e. d_P i d_N i q_P i q_N ), which are independently controlled to...

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Abstract

The invention relates to a phase-locked control method for zero-voltage ride through of a photovoltaic grid-connected inverter. Based on conventional positive-negative sequence dual-current loop control, a phase-locked control strategy of the photovoltaic grid-connected inverter is provided during zero-voltage fault ride through of a three-phase power grid. By simple treatment on proportion integral (PI) of a phase-locked loop, the phases of the output current of the inverter before and after zero-voltage fault are continuous, and current disorder and impact caused by loss of a reference voltage are prevented; and the method is simple and efficient, and the standard requirement of zero-voltage ride through of the inverter can be satisfied.

Description

technical field [0001] The invention relates to a zero-voltage ride-through phase-locked control method of a photovoltaic grid-connected inverter. Background technique [0002] In the power system, the transient drop phenomenon of the AC grid will occur due to load disturbance or line fault factors, which is one of the common grid transient faults in the power system. As photovoltaic power generation accounts for an increasing proportion of electric energy, the impact of photovoltaic grid-connected systems on the grid cannot be ignored. The off-grid of large-capacity photovoltaic systems may even cause the collapse of grid voltage and frequency, making photovoltaic parallel The application of grid power generation is limited. Therefore, the national standard GB / T 19964-2012 "Technical Regulations for Connecting Photovoltaic Power Stations to the Grid" stipulates that photovoltaic grid-connected power stations must have a certain fault voltage ride through capability, includ...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCY02A30/60Y02E10/56
Inventor 肖飞张海龙王林黄辉曹建博
Owner XUJI GRP
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