Active and passive combined electrical load three-phase imbalance adjusting device

Abstract

The invention belongs to the technical field of electric energy quality control of a power distribution network, and specifically relates to an active and passive combined electrical load three-phaseimbalance adjusting device. The device mainly comprises an alternating current power grid, a non-linear load, a capacitance separate compensation circuit, a capacitance common compensation circuit, anIGBT compensating circuit, a protection circuit and an electric energy quality adjusting intelligent controller. The device is characterized in that the capacitance separate compensation circuit, thecapacitance common compensation circuit and the IGBT compensating circuit are separately connected to the alternating current power grid in parallel, and the electric energy quality adjusting intelligent controller is separately connected with the capacitance separate compensation circuit, the capacitance common compensation circuit and the IGBT compensating circuit in a controlled manner. Fusingprotection apparatuses are correspondingly and respectively arranged between the capacitance separate compensation circuit, the capacitance common compensation circuit and the IGBT compensating circuit, and the alternating current power grid, a zero-crossing switch array is controlled to perform dynamic switching on a capacitor core group, appropriate PWM switch signals are simultaneously outputto an IGBT module, and smooth adjustment of three-phase imbalance can be realized; reactive compensation and three-phase imbalance adjustment can be both realized; the response speed is fast, and voltage flicker and fluctuation can be avoided; and harmonic current pollution is avoided, the security is higher, and the reliability is better.

Description

technical field [0001] The invention relates to the field of research and development of electric energy quality control of distribution networks, in particular to a three-phase unbalance regulating device for combined active and passive electric loads. Background technique [0002] Rural power grids have already established a certain foundation after large-scale rural power grid transformation. However, due to historical development reasons and the objective factor that the service targets are rural users, the current development of rural power grids in China still generally suffers from insufficient infrastructure investment, The grid structure is unreasonable, and the technological means are relatively backward. There is a bottleneck in the development of the overall rural low-voltage power grid, which is far from meeting the growth rate of its demand. [0003] In this context, the State Grid has proposed the goal of building a strong smart grid, and the rural power grid ...

AI Technical Summary

Problems solved by technology

In actual use, TCR itself will generate some low-order harmonic currents. When the filter parameters of FC are not designed properly, it will also cause harmonic amplification.

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