Three-phase electromagnetic series power transmission line power flow control topology circuit with voltage class of 110kV and above

Abstract

The invention discloses a topology circuit of a three-phase high-voltage electromagnetic power flow controller, and solves the problems of control of high-voltage power transmission and distribution network line power flow power and parallel line power flow and balanced power supply of power supplies on two sides during closed-loop operation in an electromagnetic power conversion mode. The circuit mainly comprises three subsystems of a three-phase step-down transformer, a voltage phase shifter and a voltage regulation transformer, wherein the three-phase step-down transformer is composed of a closed iron core magnetic circuit, a primary winding, a secondary winding and the like; the three-phase voltage phase shifter is composed of a closed iron core magnetic circuit, a primary winding, a secondary winding, a phase shifting mechanism and the like. The three-phase voltage regulating transformer is composed of a closed iron core magnetic circuit, a primary winding, a multi-tap regulating coil, an on-load voltage regulating tap switch and the like. According to the technical scheme provided by the invention, triple electromagnetic induction transformation is carried out through a three-phase step-down transformer, a voltage phase shifter and a voltage regulation transformer, and the amplitude and phase of the additional series voltage of an access line are respectively regulated, so the control of line power flow can be realized.

Description

technical field [0001] The invention belongs to the technical field of high-voltage power transmission and distribution grids and grid-connected distributed power sources, and in particular relates to the power flow control problem of the grid after the high-permeability of distributed power sources is connected. Background technique [0002] After the distributed power supply is connected to the distribution network from the load end, the electrical network structure of the high-voltage power grid is also changed, so that the high-voltage power grid changes from a single power supply radial network structure to an active two-way network structure all over the power supply. This network structure change It has a significant impact on the distribution of active power and reactive power flow in the high voltage grid. When the penetration rate of distributed power represented by photovoltaics and wind power into the high-voltage power grid exceeds a certain value, during the pe...

AI Technical Summary

Problems solved by technology

When the penetration rate of distributed power represented by photovoltaics and wind power into the high-voltage power grid exceeds a certain value, during the period of high occurrence of distributed power, active power transfer will be inevitable, thus changing the characteristics of the one-way flow of energy in the high-voltage power grid, and The intermittency, volatility, and space-time characteristics of photovoltaic and wind power further increase the complexity and difficulty of regulating the active and reactive power flows of the high-voltage power grid, which may lead to high or low node voltages of the high-voltage power grid, hub lines or power flow sections. Problems such as overload or severe power imbalance pose a threat to the safe operation of the high-voltage power grid and its electrical equipment

[0003] When the unified power flow control device (UPFC) of pure power electronics technology is used, the power electronic switch control is flexible, the modulation is convenient and accurate, and the regulation of the line flow can be well realized, but the pure power electronic system has small heat capacity, poor tolerance, and resistance Weak impact capacity, high cost and other deficiencies, it is difficult to adapt to the thunderstorm and snow disasters faced by the high-voltage power network and high-voltage lines, the natural environment of severe heat and cold, and the complex load nature and other conditions

[0004] Thyristor Controlled Series Compensation (TCSC) devices are used to adjust the line reactance, which can compensate the reactance voltage component of the line. It is suitable for voltage regulation of traditional high-voltage lines (high inductance, small or even negligible line resistance), and indirectly changes the line voltage. power flow, but this method cannot achieve precise control of active and reactive power flows

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