Fall-down experimental method of simulating power grid

Abstract

The invention relates to an experimental method for simulating falling down of a power grid, which is mainly used for simulating the fall-down situation of the power grid, so as to detect the running conditions of an electric generator, a converter and other equipment in wind energy field when the power grid falls down. The experimental equipment adopted by the invention comprises a first transformer, a second transformer, a switch and an alternating current power supply; the secondary edge of the first transformer comprises a first winding and a second winding, the second winding is connected with the secondary edge of the second transformer in series; the primary edge of the second transformer is connected with the switch; and the alternating current power supply in parallel. The experimental method disclosed by the invention includes both the normal situation and fall-down situation of simulating the power grid. The theory of the invention is correct and feasible; the invention does not need to be transported to the site to wait for the happening of short circuit or falling down or other faults of the power grid when detecting electric generators, converters and other equipments in wind energy field, thereby saving product delivery time.

Description

technical field [0001] The invention relates to an experimental method for simulating a power grid drop, which is mainly used for simulating the power grid drop to detect the operation conditions of generators, converters and other equipment in the wind energy field under the power grid drop condition. Background technique [0002] In the wind power generation system, the converter controls the excitation of the generator, controls the frequency and amplitude of the electric energy generated by the generator to be constant, and adjusts the power factor of the generated electric energy according to the requirements of the upper-level main control system. However, during the operation of the power grid, there will be faults such as overvoltage of the power grid operation, a short circuit to ground at a certain point of the power grid, and a short circuit between phases at a certain point of the power grid. Due to the instability of wind energy relative to thermal power and hyd...

AI Technical Summary

Problems solved by technology

[0004] Due to the huge actual capacity of the power grid, it is very difficult to simulate the power grid drop fault due to the low-voltage ride-through experiment verification of the prototype during the development stage of the wind turbine generator set

Many converter manufacturers and complete machine manufacturers have adopted on-site trial methods. However, faults such as short circuits and drops in the power grid are very random, and on-site trials often take up too much time and affect product delivery.

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