High- and low-voltage ride through testing device with function of short circuit to ground and testing method

Abstract

The invention relates to a high- and low-voltage ride through testing device and testing method for photovoltaic power stations and wind power generating sets and aims to solve the problem of dependence on neutral-point solid ground of a medium-voltage side of a main boosting transformer in implementation of short circuit to ground ride through testing in application of existing voltage ride through testing devices. The testing device comprises an incoming switch K1, a current-limiting reactor L1, a short-circuit reactor L2, a boost capacitor C, a damping resistor R, short circuit switches K2and K3, single-phase option switches K4-K6, an earthing switch K7 and a Z type transformer T1. The current-limiting reactor L1 and the short-circuit reactor L2 form impedance component voltage, and apower grid low voltage dropout process is simulated through different tap position combinations. The current-limiting reactor L1 and the boost capacitor C form capacitance boosting voltage, and a power grid voltage swell process is simulated through different tap position reactance and capacitance combinations. The damping resistor R is used for inhibiting impact and oscillation in input of the capacitor C. The Z type transformer T1 is used for providing an earthing circuit to realize simulation of power grid short circuit to ground.

Description

technical field [0001] The invention relates to a high-low voltage ride-through test device with a ground-short circuit function, which is used for high-low voltage ride-through tests of photovoltaic inverters, photovoltaic power stations, wind power converters and wind power generators; [0002] The invention also relates to a high-low voltage ride-through test device, which is used for the high-low voltage ride-through test of photovoltaic inverters, photovoltaic power stations, wind power converters and wind power generating sets. Background technique [0003] Existing high-low voltage ride-through devices can only perform three-phase high-low voltage ride-through tests and two-phase high-low voltage ride-through tests in photovoltaic power plants or wind farms. Whether single-phase or two-phase high-low voltage ride-through tests can be performed depends on the photovoltaic power plant. Or the neutral point grounding method of the medium-voltage side winding of the main ...

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: To provide a high-low voltage ride-through test device with the function of short-circuit to ground, to solve the problem of how to realize the test of short-circuit ride-through to ground even when the neutral point on the medium-voltage side of the main step-up transformer is not directly grounded

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