New-energy high-low voltage ride-through testing device

Abstract

The invention provides a new-energy high-low voltage ride-through testing device, and the device is suitable for the high-voltage and low-voltage ride-through capabilities. The device is connected in series between tested equipment and a power grid, and comprises an input circuit breaker connected with a power grid. The input circuit breaker, a voltage adjustment unit and an output circuit breaker are connected sequentially. Moreover, the output circuit breaker is connected with the tested equipment, and two ends of the voltage adjustment unit are in parallel connection with a bypass circuit breaker. The device is advantageous in that the device can truly simulate an on-site fault, is suitable for the testing of a high-voltage system, is also suitable for the testing of a low-voltage testing, is flexible testing, and is convenient to install; the device achieves the fault simulation of different voltage levels through controlling a thyristor valve block to achieve the high-speed switching of a transformer tap, is flexible and convenient in testing, is high in reliability, and achieves the one-time recovery or stepped recovery of voltages according to the requirements; the device employs a modularized design, is convenient to assemble, and is simple in testing.

Description

technical field [0001] The invention belongs to the technical field of renewable energy grid-connected testing, and in particular relates to a new energy high-low voltage ride-through test device capable of simultaneously realizing high-voltage ride-through and low-voltage ride-through capability tests of wind turbines. Background technique [0002] There are three types of existing new energy high and low voltage ride-through test devices: impedance divider type, transformer type and power electronic conversion type. [0003] Among them, the impedance divider type is composed of an adjustable current-limiting reactor and an adjustable short-circuit reactor. The voltage drop value of the test point is realized by changing the impedance divider ratio. This method can only simulate low-voltage ride-through, but cannot achieve high-voltage ride-through. At present, through the transformation of this scheme, the short-circuit reactor is changed to a capacitor, and the input of c...

AI Technical Summary

Problems solved by technology

[0005] The transformer type uses the fast switching of the thyristor solid-state switch to select the taps of the multi-tap transformer, corresponding to different voltage levels, and realiz

Images