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

Abstract

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

Description

technical field [0001] The invention belongs to the technical field of high-voltage power transmission grid and distributed power grid connection, and in particular relates to the power flow control problem of the grid after the high penetration rate of distributed power is connected. Background technique [0002] After the distributed power supply is connected to the power grid from the load side, the electrical network structure of the high-voltage network is also changed, so that the high-voltage power grid changes from a single-power radial network structure to an active bidirectional network structure that spreads across the power supply. The distribution of active power and reactive power flows in the grid has a major impact. 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 reverse transmission will ...

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 reverse transmission will be inevitable, thus changing the power flow operation of the entire high-voltage network, and photovoltaic , The intermittency, volatility and space-time characteristics of 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 excessively high or low node voltages of the high-voltage power grid, overloading of hub lines or power flow sections Or serious power imbalance and other problems, which 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. However, the pure power electronic system has small heat capacity, poor tolerance, 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 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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