Superposition principle based programmable harmonic voltage source for large power test

Abstract

The invention discloses a big-power test programmable resonance wave voltage source which is based on superposition principle, the resonance wave voltage source includes three phase commutating bridge, dc-to-ac converter, transformer in series, three phase resistance-capacitance loop and current track control circuit, the three phase commutating bridge is connected with the electricity net via inlet inductance and three switch; the structure of the dc-to-ac converter is three single-phase H bridges, each of which composes four switching tubes IGBT, the big-power test programmable resonance wave voltage source which is based on superposition principle adopts principle of separating base wave and resonance wave, the electricity provides the voltage of base wave, voltage of resonance wave is provided by the resonance wave voltage source, they are combined to make tested equipment get required voltage wave, the resonance wave is generated by controlling the dc-to-ac converter, the control mode can decreases the current in the dc-to-ac converter, and increases the capability of system, it can replace the programmable power source under most conditions.

Description

technical field [0001] The invention belongs to testing experimental equipment in power quality research, in particular to a programmable harmonic voltage source for high-power testing based on the principle of superposition. Background technique [0002] According to the data retrieval conducted by the applicant, up to now, no high-power programmable harmonic voltage source used in the study of voltage quality problems has been proposed in the prior art. At present, there are mainly two types of reference voltage sources and DC standard voltage sources. The reference voltage sources are mainly developed towards high-precision, low-power bandgap reference voltage sources. The levels of several volts and tens of volts. The DC standard voltage source mainly provides the DC power for the experiment for the circuit. However, there is no product for the high-power harmonic voltage required in the experiment for large-capacity power quality control equipment...

AI Technical Summary

Problems solved by technology

[0005] When conducting experimental research and testing on voltage quality control devices, people usually use programmable power supplies to simulate voltage quality problems in the power grid. With the continuous increase in the capacity of control devices, it is difficult for programmable power supplies to meet the experimental testing requirements of these devices.

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