A high and low voltage ride through test device with the function of short circuit to ground

Abstract

The invention relates to a high-low voltage ride-through test device for a photovoltaic power station and a wind power generating set, which is used to solve the problem that the existing voltage ride-through test device must rely on the direct grounding of the neutral point on the medium-voltage side of the main step-up transformer to realize the ground-to-ground short-circuit ride-through test. The test device includes incoming line switch K1, current-limiting reactance L1, short-circuit reactance L2, boost capacitor C, damping resistor R, short-circuit switches K2 and K3, single-phase selector switch K4‑K6, grounding switch K7 and Z-type transformer T1 . The current-limiting reactance L1 and the short-circuit reactance L2 form an impedance divider, which simulates the low-voltage drop process of the power grid through different gear combinations. The current-limiting reactance L1 and the boost capacitor C form a capacitive boost, and the grid voltage surge process is simulated through different gear reactance and capacitor combinations. The damping resistor R is used to suppress the impact and oscillation when the capacitor C is switched on, and the Z-shaped transformer T1 is used to provide a ground loop to realize the simulation of the 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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