Chain type SVG-based photovoltaic inverter high-voltage ride-through test system

Abstract

The invention relates to a chain type SVG-based photovoltaic inverter high-voltage ride-through test system. The chain type SVG-based photovoltaic inverter high-voltage ride-through test system is used for improving the voltage of the power supply end of a tested device so as to make the tested device withstand voltage higher than rated voltage. The chain type SVG-based photovoltaic inverter high-voltage ride-through test system includes a power source incoming line isolation transformer, a high-voltage switch K1, a reactor L, a high-voltage switch K2, a chain type SVG, and an isolation transformer of the tested device. By means of perfect matching of the reactor L and the chain type SVG, the high-voltage ride-through test of a photovoltaic inverter can be realized accurately. The power loss of the test system is low; difficulty in parameter matching in switching in of a capacitor which is utilized to realize a high-voltage ride-through test can be avoided; the problem of parallel resonance which is brought about by the improper matching of the capacitor and system parameters can be avoided; and based on the characteristics of the SVG, the test system can be also adopted as a low-voltage ride-through test system; and the test system is conducive to the standardization of high-voltage ride-through test systems.

Description

technical field [0001] The invention relates to a chain-type SVG-based photovoltaic inverter high-voltage ride-through test system, aiming at the high-voltage ride-through test of grid-connected inverters of photovoltaic power generation systems. Background technique [0002] In recent years, with the widespread use of photovoltaic power generation systems and the continuous increase of grid-connected installed capacity, its operation and control strategies under grid fault conditions have directly affected the safe and stable operation of the power system. The existing research mainly focuses on the analysis of the electromagnetic transient impact of the grid voltage drop fault on the photovoltaic power generation system and the corresponding low-voltage ride-through technology, while the corresponding research results under the grid voltage surge condition are still rare. . In fact, the sudden rise of the grid voltage in the actual power system is often accompanied by the...

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Problems solved by technology

The Chinese utility model patent "Mobile Wind Turbine High-Low Voltage Ride-through Test Device" with the patent number of 201220255118.5 provides a power grid high-voltage simulation scheme, which realizes the rise of the terminal voltage of the wind turbine through the tap jump of the secondary winding of the transformer. The high-voltage waveform generated by this method has a too fast voltage rise rate and cannot simulate the phase angle and power quality changes in the actual grid overvoltage process, which is not suitable for the test requirements of the high-voltage capability of wind turbines.

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