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Static synchronous series compensation device of combining series compensation and converter

A series compensation, static synchronization technology, applied in circuit devices, AC network circuits, flexible AC transmission systems, etc., can solve the problems that flexibility and action speed cannot meet precise adjustment, do not have capacity and price advantages, and high insulation requirements. Achieve the effect of continuous and fast two-way adjustment ability, improve dynamic response performance, and reduce insulation level

Active Publication Date: 2016-09-28
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional capacitors and reactors are used as line series compensation, and their flexibility and action speed cannot meet the requirements of precise adjustment; traditional controllable series compensation has high requirements for insulation and general economy; conventional static synchronous series compensators have flexible and excellent control functions, but Its promotion and use in the power system does not have capacity and price advantages

Method used

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  • Static synchronous series compensation device of combining series compensation and converter
  • Static synchronous series compensation device of combining series compensation and converter
  • Static synchronous series compensation device of combining series compensation and converter

Examples

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Embodiment 1

[0043] Embodiment 1: After changing the firing angle of the thyristor in the thyristor bidirectional switch, the equivalent reactance of the reactor unit 101 is smaller than the equivalent capacitive reactance of the capacitor unit 102, then the static synchronous series compensation device works in the capacitive compensation mode, and the transmission line Perform capacitive compensation.

Embodiment 2

[0044] Embodiment 2: After changing the firing angle of the thyristor in the thyristor bidirectional switch, the equivalent reactance of the reactor unit 101 is greater than the equivalent capacitive reactance of the capacitor unit 102, then the static synchronous series compensation device works in the inductive compensation mode, and the power transmission line is Sensual compensation.

[0045] In the embodiment of the present invention, the second switch includes any one of a circuit breaker, an isolating switch and a power electronic switch or any two switches connected in parallel, and the second switch is used to control the input and withdrawal of the coupling transformer. Wherein, the two types of switches connected in parallel may be that the circuit breaker is connected in parallel with the isolating switch, the circuit breaker is connected in parallel with the power electronic switch, and the isolating switch is connected in parallel with the power electronic switch....

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Abstract

The invention provides a static synchronous series compensation device of combining series compensation and a converter. The static synchronous series compensation device comprises the converter, a coupling transformer, an inductive offset type module and / or a capacitive offset type module, wherein the inductive offset type module is sequentially connected with the converter and then is connected with a side winding of the coupling transformer in parallel; the other side winding of the coupling transformer is connected with a power transmission line; the capacitive offset type module is sequentially connected with the converter and then is connected with one side winding of the coupling transformer and the other side winding of the coupling transformer is connected with the power transmission line; the inductive offset type module comprises a reactor unit; and the capacitive offset type module comprises a capacitor unit and a first switch which are connected in series. Compared with the prior art, the static synchronous series compensation device of combining series compensation and the converter provided by the invention has the advantages that the static synchronous series compensation device can be applied to the power transmission line or a power distribution line for capacitive and inductive regulation; the line transmission capacity is improved; the system stability level is improved; the line power flow is controlled; the system damping is strengthened; and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a static synchronous series compensation device combining series compensation and a converter. Background technique [0002] Series compensation devices are often used on transmission lines to increase the stable transmission capacity of the system and improve the electrical parameters of the line. On long transmission lines, series capacitors can be used to counteract the effects of line inductance. Since the series capacitor and the line inductance are connected in series, the current is the same, the voltage of the capacitor lags the current by 90 degrees, and the voltage of the inductor leads the current by 90 degrees, so the capacitor voltage and the inductor voltage are exactly opposite and can cancel each other out. Thereby shortening the equivalent electrical distance and improving the power transmission capacity and voltage stability of the power grid. [000...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCY02E40/10H02J3/00
Inventor 陆振纲尉志勇宋洁莹戴朝波邓占锋赵国亮蔡林海
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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