Photovoltaic inverter voltage swell test system

Abstract

The invention relates to a photovoltaic inverter voltage swell test system. The photovoltaic inverter voltage swell 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 photovoltaic inverter voltage swell test system includes a power source incoming line isolation transformer, a high-voltage circuit breaker K2, an adjustable reactor L, a high-voltage circuit breaker K1, a capacitor C, an adjustable resistor R and a distribution line isolation transformer, wherein the power source incoming line isolation transformer and the high-voltage circuit breaker K2 are connected in series, the high-voltage circuit breaker K2 and the reactor L are connected in series, the reactor L and the distribution line isolation transformer are connected in series, and the high-voltage circuit breaker K1 is connected in series with the capacitor C and the adjustable resistor R and then is connected in parallel between the reactor L and the isolation transformer series connection point of the tested device. With the photovoltaic inverter voltage swell test system of the invention adopted, a high voltage ride-through process of a power grid is simulated, and the high voltage ride-through ability of a photovoltaic inverter can be tested; by means of the matching of the adjustable reactor and the adjustable resistor, voltage overshoot and overcurrent in the switching in of the capacitor can be avoided, and a voltage swell test of the photovoltaic inverter can be realized accurately.

Description

technical field [0001] The invention relates to a photovoltaic inverter voltage swell test system, which is aimed at testing the voltage swell of a grid-connected inverter of a photovoltaic power generation system. 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 failure of the grid voltage dro...

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Problems solved by technology

The utility model patent "Mobile Wind Turbine High and Low Voltage Ride-through Test Device" patent number is: 201220255118.5, although it provides a power grid high voltage simulation scheme, which realizes the rise of wind turbine terminal voltage through the transformer secondary winding tap jump, but 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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