High-voltage ride-through control method of two-stage photovoltaic inverter
A photovoltaic inverter and control method technology, applied in the direction of AC network voltage adjustment, reactive power compensation, single-network parallel feeding arrangement, etc., can solve reactive current support, large DC bus voltage fluctuations, and inverter surge current Large and other problems, to achieve the effect of reducing impact and ensuring stability
Active Publication Date: 2020-04-10
TBEA XIAN ELECTRIC TECH +1
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Problems solved by technology
Most of the existing technologies do not do special treatment for the increase of grid voltage, and there are problems such as large inverter surge current, large fluctuation of DC bus voltage, and reactive current support.
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[0040] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0041] figure 1 It is a system block diagram of a two-stage photovoltaic inverter. As shown in the figure, Boost1~BoostN are respectively connected in series with photovoltaic array 1~photovoltaic array N. The terminal is connected to the input terminal of the subsequent stage inverter circuit, and the output terminal of the latter stage inverter circuit is directly connected to the power grid. The two-stage circuit raises the low voltage output by the photovoltaic array through the Boost circuit to a stable high-voltage direct current and then confluences it to the DC bus.
[0042] figure 2It is the control flow of the high voltage ride-through of the inverter circuit of the two-stage photovoltaic inverter, as shown in the figure:
[0043] Step 1: Sampling the three-phase grid side voltage u of the rear inverter a , u b , u c ...
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The invention provides a high-voltage ride-through control method of a two-stage photovoltaic inverter. The method comprises the following steps: adding a filter in a phase-locked loop to obtain a power grid fundamental wave positive sequence component; performing integral clearing and wave sealing processing on an inverter voltage and current loop at the moment of high-voltage ride-through; switching a bus voltage instruction value after the high-voltage ride-through occurs; and generating reactive power according to the power grid rising height to support power grid recovery, wherein for Boost control, the instruction value of the PV current loop is switched from the output of the PV voltage loop to the PV current value before high voltage ride through. The method can effectively reducethe impact current in the high-voltage ride-through process, can guarantees the stability and reliability of the DC bus voltage in the high-voltage ride-through process, gives the reactive current inthe high-voltage ride-through process to support the recovery of the power grid, and keeps the active power basically unchanged before and after high-voltage ride-through.
Description
technical field [0001] The invention relates to the technical field of two-stage photovoltaic inverters, in particular to a high-voltage ride-through control method for two-stage photovoltaic inverters. Background technique [0002] The photovoltaic inverter is an important part of the photovoltaic power generation system. The two-stage photovoltaic inverter is generally composed of a boost circuit and an inverter circuit. The boost circuit increases the low voltage output by the photovoltaic array into a stable high voltage direct current, and then The inverter circuit converts to alternating current, sending the energy into the grid. [0003] High Voltage Ride Through (HVRT) means that when the power system accident or disturbance causes the voltage on the AC outlet side of the photovoltaic inverter to rise, within a certain voltage drop range and time interval, the photovoltaic inverter can guarantee that the Off-grid continuous operation, and generate dynamic reactive p...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H02J3/16H02J3/38
CPCH02J3/16Y02E40/30Y02E10/56
Inventor 李蕴温鲁锦锋李其玉翟向杰张美美梁欢迎
Owner TBEA XIAN ELECTRIC TECH