High-power energy feedback type power grid analog device and control method adopted in same

Abstract

The invention relates to a high-power energy feedback type power grid analog device which comprises a PWM rectification part and a power grid analog part, and the PWM rectification part and the power grid analog part share the same direct-current bus; the PWM rectification part comprises an input filtering unit and a three-phase bridge rectification unit; the power grid analog part comprises three single-phase inverters, an output filtering unit and an isolation unit. A control method adopted in the high-power energy feedback type power grid analog device comprises the steps that a double closed loop control device provided with a phase-locked loop and composed of a voltage outer ring and an inductive current inner ring is adopted in the PWM rectification part to control the amplitude and waveform of currents and the voltage of the direct-current bus; a digital-analog hybrid three-loop control device comprising the inductive current instantaneous value, the voltage instantaneous value and the voltage effective value is adopted in the power grid analog part to control the amplitude and waveform of the voltage of an analog power grid. The high-power energy feedback type power grid analog device has high net side power factors, can feed energy back to the power grid, and breaks through the limits of low switching frequency and bandwidths.

Description

technical field [0001] The present invention relates to a high-power energy feedback type power grid simulation device and its control method, that is, an energy-saving high-power power grid simulation device capable of realizing any power grid waveform, that is, energy can be fed back to the power grid, and the control method adopted by the device method. Background technique [0002] Traditional grid simulators are usually low power and non-regenerative. When it is necessary to absorb the power fed back by the load, a high-power resistor is usually used to absorb energy. This method consumes a lot of energy, and heat dissipation is difficult to handle. When the power becomes larger, the output bandwidth of the power supply becomes lower, which cannot meet the customer's requirements for high dynamic response speed. Contents of the invention [0003] The purpose of the present invention is to provide a high power, high bandwidth and high dynamic response speed, energy ...

AI Technical Summary

Problems solved by technology

This method consumes a lot of energy, and the heat dissipation is difficult to handle

When the power becomes larger, the output bandwidth of the power supply becomes lower, which cannot meet the customer's requirements for high dynamic response speed

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