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Control method of controllable series compensation device based on parallel connection of double TCR (Thyristor Controlled Reactor) branch circuits

A branch and parallel technology, applied in the field of controllable series compensation, can solve problems such as insufficient flow capacity of thyristor valves

Inactive Publication Date: 2015-07-08
CHINA EPRI SCIENCE & TECHNOLOGY CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the above problems, to provide a controllable series compensation device and its control method based on the parallel connection of double TCR branches. The series compensation device makes the current flowing through each TCR branch through the parallel connection of two TCR branches It is smaller than the maximum rated current of the existing thyristor valve, thereby solving the problem of insufficient flow capacity of the existing thyristor valve in the UHV controllable series compensation, through the equal control of the two TCR branch circuits of the series compensation device and the basic Wave impedance control to achieve the current sharing and impedance requirements of the two TCR branches

Method used

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  • Control method of controllable series compensation device based on parallel connection of double TCR (Thyristor Controlled Reactor) branch circuits
  • Control method of controllable series compensation device based on parallel connection of double TCR (Thyristor Controlled Reactor) branch circuits
  • Control method of controllable series compensation device based on parallel connection of double TCR (Thyristor Controlled Reactor) branch circuits

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Embodiment 1

[0100] 1. Acquisition of TCR branch current amplitude

[0101] The sampling signal pulse is generated by detecting the zero-crossing point of the capacitor voltage, and the TCR branch current is sampled. from image 3 It can be seen from the timing diagram that when the capacitor voltage u c When crossing zero, the current of the TCR branch (in the figure i L1 and i L2 ) reaches the maximum absolute value. Using this relationship, by detecting the zero-crossing point of the capacitor voltage, a sampling pulse signal is generated, and the currents of the two TCR branches are respectively sampled. After obtaining the sampling value, the absolute value is taken as the amplitude of the two branch currents, and It is used in the following algorithms and control strategies.

[0102] 2. Control of equal current amplitudes in two TCR branches

[0103] by figure 1 Take the parallel scheme shown as an example (maybe let L 1 2 ), the specific implementation manner in which the cu...

Embodiment 2

[0132] According to the above, using Figure 7 As shown in the simple circuit, the method and method of the present invention are simulated and analyzed to verify the feasibility of the present invention. still with figure 1 The described scheme is used as an example. Figure 7 , the voltage source amplitude is 500kV, and the line equivalent resistance R L =11.0Ω, line equivalent reactance X L =111.15Ω, the basic capacitance value of controllable series compensation C=190.5μF, the inductance of the two valve series reactors takes the maximum manufacturing process error ±5%, L 1 =0.01729H,L 2 =0.01911H.

[0133] According to the main circuit parameters and formula (3) of the simulation circuit, the impedance characteristic table suitable for the parallel connection of double TCR branch TCSC can be established, as shown in attached table 1. In Table 1, only a few points are selected for illustration. In actual application, dense points should be selected according to the m...

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Abstract

A two TCR branches in parallel based controllable series-compensated device and a control method thereof are provided. The controllable series-compensated device includes two TCR branches in parallel, causing a lower current in each TCR branch and thereby solving the problem of the shortage of flow capacity of existing thysitors in an extra-high-voltage controllable series-compensated device. The TCR branch is composed of two antiparallel thyristors in series with a reactor (L1, L2) and then two TCR branches are connected in parallel, which forms the controllable series-compensated device; or two TCR branches in parallel are in series with a common reactor (L3), which forms the controllable series-compensated device. The demands of flow equalization and impedance are satisfied by controlling the equal current amplitudes in two TCR branches of the series-compensated device and the impendence of fundamental wave. The controllable series-compensated device could be satisfying the need of impendence control, of a simple controlling unit, using linear control, easy to carry out in practice and of good control stability.

Description

technical field [0001] The invention belongs to the field of Thyristor Controlled Series Capacitor (TCSC) in the field of flexible alternating current transmission, and specifically relates to it. Background technique [0002] At present, my country has begun to build a 1000kV UHV transmission network, and has put into operation a 1000kV Jindongnan-Nanyang-Jingmen UHV AC test project. UHV AC transmission has obvious advantages in terms of transmission capacity, transmission distance, and power loss. However, due to the long-distance, large-capacity characteristics of the UHV line itself, as well as the system's transient stability and other requirements, the transmission capacity of some UHV transmission lines is limited, and it is difficult to play its due role. The advantages. With the help of the development experience of the ultra-high voltage power grid, installing a series compensation device on the ultra-high voltage transmission line can significantly improve the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/20
CPCY02E40/12H02J3/1807Y02E40/10
Inventor 武守远戴朝波胡臻达王宇红
Owner CHINA EPRI SCIENCE & TECHNOLOGY CO LTD
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