Bidirectional voltage adaptive adjustment method for electromagnetic series power transmission line

Abstract

The invention discloses a bidirectional voltage adaptive adjustment method for an electromagnetic series power transmission line, belongs to the field of grid connection of a power distribution network and a distributed power supply, and solves the problem that the tail end voltage is low due to long power supply and distribution lines, especially the tail end voltage of the line is higher due to high permeability access of the distributed power supply. A real-time calculation method is used to complete real-time automatic control of the electromagnetic series power transmission line bidirectional power flow control main circuit; through acquisition of voltage and current information of an input end and an output end, a line real-time impedance value is obtained by using a line impedance adaptive extraction method, and then a driving pulse signal of a terminal switching driving circuit is obtained through a line adjustment voltage real-time calculation module. Therefore, the on-load tap of each phase circuit in the electromagnetic series power transmission line bidirectional power flow control main circuit is finally controlled, and the self-adaptive independent adjustment of the amplitude and the phase of the additional series voltage of the power distribution system line is realized.

Description

technical field [0001] The invention belongs to the technical field of distribution network and distributed power grid connection, and particularly relates to the problem of over-limit (too high and too low) terminal voltage of transmission lines caused by high penetration rate of distributed power and long line access. Background technique [0002] Since distributed power sources are mostly located in remote areas, even in barren mountains and wastelands, long-distance distribution lines are often required to transmit electric energy. The upper limit of the power supply voltage will cause harm to the power equipment of the end users and users along the line; simply lower the voltage at the outlet of the substation to ensure that the voltage at the end of the line does not exceed the upper limit when the power is sent back during the day, which will cause the voltage at the end of the line to be lower than the lower limit at night, that is, in the distributed power supply. U...

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Problems solved by technology

The energy-taking coil of the electromagnetic series transmission line bidirectional voltage adaptive adjustment device is connected in parallel between the live line and the neutral point (or neutral line) of the single-phase transmission line, and the electromagnetic bidirectional transmission line voltage adjustment circuit is connected in series to the transmission line. In the line, the voltage amplitude and its positive and negative polarity on the series line are changed through the double-sided terminal transfer mechanism, so as to realize the adjustment of the voltage at the end (or rear section) of the line, and solve the problem of high penetration rate of distributed power supply or long line connection. Terminal voltage limit (too high and too low) problem caused by input

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