A 360-degree quadrature direct power flow controller and a working method thereof

Abstract

A 360-degree quadrature direct power flow controller and a working method thereof are disclosed. That direct power flow controller comprises a three-phase input transformer module, an input selector switch, a single-phase Buck alternating current unit circuit module, a three-phase filter, an output selector switch and a three-phase output transformer module. The input end of the direct power flowcontroller is connected in parallel to the high-voltage power network, and the output end of the direct power flow controller is connected in series to the high-voltage power network. The input selector switch is connected to the primary side or the secondary side of the three-phase input transformer module, and the output selector switch is connected to the primary side or the secondary side of the three-phase output transformer module. The single-phase Buck alternating current unit circuit module comprises an A-phase Buck AC unit circuit, a B-phase Buck AC unit circuit and a C-phase Buck ACunit circuit with the same circuit structure. The controller only comprises a simple Buck alternating current unit circuit, and can control the voltage phase and amplitude of the transmission terminalof the power network at the same time through only one-stage power conversion, can respectively control the active power flow and the reactive power flow in the line, and realizes the adjustment of the phase angle of the output voltage by 360 DEG.

Description

technical field [0001] The invention relates to the technical field of power electronic conversion, in particular to a phase 360° orthogonal direct power flow controller (Direct power flow controller, DPFC) and a working method thereof. Background technique [0002] As a basic energy source, electricity is an important guarantee for the healthy development of the national economy. The power flow in the power system includes active power flow and reactive power flow, which are generally determined by the power source, load and power supply network. In the case of insufficient infrastructure investment and long period, and the relative lag of the existing power system facilities, it is necessary to improve the power flow control capability of the power grid, thereby enhancing the stability of the power system, improving its utilization rate and the power transmission capacity of the power grid. Important economic benefits and social significance. [0003] In the traditional ...

AI Technical Summary

Problems solved by technology

However, most FACTS devices have only one control degree of freedom, and cannot simultaneously control the active power flow and reactive power flow in the power grid separately, or due to the use of large-capacity DC energy storage components, the equipment failure rate is high, the life cycle is short, and the maintenance cost is high. many problems

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