Interactive voltage-stabilizing system with bidirectional energy flow, and operation method

Abstract

The invention provides a voltage-stabilizing system for regulating voltage fluctuation of a power grid. The voltage-stabilizing system comprises a critical load module, a non-critical load module, a bidirectional critical load power spring, a plurality of voltage detection modules, a plurality of current detection modules and a plurality of phase detection modules, wherein the bidirectional critical load power spring is connected with the critical load module and the non-critical load module in series, and is connected to the power grid by means of a transmission lead wire. The invention further provides an operation method of the voltage-stabilizing system for regulating voltage fluctuation of the power grid. The interactive voltage-stabilizing system has the beneficial effects that: the interactive voltage-stabilizing system does not require the participation of an energy storage device, but compensates energy at the non-critical load side to the critical load by means of bidirectional energy flow, so as to maintain stability of voltages at two ends of the critical load; since the interactive voltage-stabilizing system can compensate the voltage of an arbitrary phase angle, the frequencies and phase positions of the voltages at two ends of the critical load can be corrected; and since the interactive voltage-stabilizing system provides voltage compensation to the critical load directly, the interactive voltage-stabilizing system has low impedance and voltage division requirements for the transmission line, has large regulation range and low cost, provides reasonable voltage and energy management for the future distributed power generation system, and is conductive to the large scale application of new energy power generation.

Description

technical field [0001] The invention relates to the field of operation control of an AC power grid, in particular to an interactive voltage stabilizing system and an operation method for bidirectional energy flow, and a high-permeability new energy power supply grid. Background technique [0002] With the development of renewable energy (such as wind energy, solar energy, etc.) power generation technology, its grid-connected capacity is increasing year by year. For large-scale power grids, because of their strong self-regulation capabilities, and the proportion of renewable energy power generation is not large, the stability of the grid will not be greatly affected. For isolated microgrids with small capacity, the proportion of renewable energy power generation is often greater than 15%. If its irregularly changing output power cannot be balanced with the grid load, it will cause obvious fluctuations in the effective value of the grid voltage. The fluctuation of the effecti...

AI Technical Summary

Problems solved by technology

[0006] The electric spring for reactive power compensation does not need an energy storage device, but compensates for pure reactive power. This electric spring has a small adjustment range and has a large dependence on the impedance of the transmission line. The current on the large transmission line divides the line impedance too much to achieve voltage adjustment, which will cause redundant losses

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