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Unit series compensation power transmission system

A technology of power transmission system and unit

Pending Publication Date: 2019-11-22
NORTH CHINA POWER ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] First of all, since the transmission line is often multi-circuit, when adding a series capacitor compensation device on the transmission line, the overload problem after one or even two circuit faults must be considered, thus increasing the scale and engineering of the capacitor bank in the series capacitor compensation device. total investment; and since the series capacitor compensation device is centrally installed in the system, it may also bring negative impact to the unit, and even cause the scheme to fail
[0008] Secondly, there are many and complex system operation modes and fault forms that need to be considered when connecting the series capacitor compensation device of conventional lines. Therefore, higher requirements are put forward for the series capacitor compensation device, which also increases the design difficulty and equipment requirements.
[0009] Furthermore, the conventional line series capacitor compensation device must be placed on the high-voltage insulation platform, which increases the investment in the construction of the high-voltage insulation platform

Method used

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Examples

Experimental program
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no. 1 example

[0040] Such as Figure 2a As shown in FIG. 1 , it is a schematic diagram of a basic structure of power transmission with series capacitance compensation of units in an embodiment of the present invention. Wherein, the series capacitance compensating device is connected to the high-voltage line between the step-up transformer of the generator and the system bus connected to the step-up transformer of the generator. Specifically, different generators U1-U4 of the power plant are respectively boosted by step-up transformers T1-T4, and then respectively connected to series capacitor compensation devices SC1-SC4, and then connected to the system bus. It can be seen that in the embodiment of the present invention, in order to improve the power transmission capacity and the stability of the unit, each generator can be connected in series with a series capacitor compensation device on the high-voltage lead wire connected to the system bus.

[0041] It should be noted that in practica...

no. 2 example

[0046] Such as Figure 2b As shown in FIG. 2 , it is a schematic diagram of another basic architecture of series capacitance compensation power transmission according to the embodiment of the present invention. Wherein, the series capacitance compensation device is connected to a high-voltage line between the generator and the system bus connected to the generator. Specifically, different generators U1-U4 of the power plant are respectively connected to the series capacitor compensation devices SC1-SC4, and then connected to the system bus. It can be seen that in the embodiment of the present invention, in order to improve the power transmission capability and the stability of the unit, a series capacitor compensation device can be connected in series to the high-voltage lead of each generator connected to the system bus.

[0047] Optionally, each of the series capacitance compensation devices SC1-SC4 includes three-phase identical unit single-phase series capacitance compens...

no. 3 example

[0050] refer to Figure 2a , in the embodiment of the present invention, the series capacitance compensation device is connected to the low-voltage end of the high-voltage output circuit of the step-up transformer of the generator, that is, between the low-voltage end of the high-voltage winding of the step-up transformer and the neutral point of the three-phase connection. Specifically, different generators U1-U4 of the power plant are boosted by step-up transformers T1-T4 respectively, and connected to the system bus. In order to improve the power transmission capacity and unit stability, the embodiment of the present invention connects series capacitance compensating devices SC1-SC4 respectively on the leads of each generator U1-U4 connected to the system bus. Both terminals can be drawn out. In order to reduce the withstand voltage level of the series capacitor compensation device, the series capacitor compensation device is connected in series between the low-voltage end ...

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Abstract

The embodiment of the invention provides a unit series compensation power transmission system which comprises a series capacitance compensation device, and the series capacitance compensation device is connected in series between a generator and a system bus connected with the generator. The unit series compensation power transmission system provided by the embodiment of the invention can improvethe power transmission capacity and the stability level of a unit, and is low in investment and is convenient to maintain.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a unit series compensation power transmission system. Background technique [0002] In the field of generator access system and power system stability, when the synchronous generator set is connected to the system, because the power transmission distance is too far or the connection with the system is too weak, the stability level of the synchronous generator set cannot meet the requirements of relevant standards, usually need Through certain methods and measures to improve the stability level. [0003] Adding series capacitance compensation on the power transmission line sent by the power plant to improve the stability of the power system has been widely used, but these applications are all on long-distance transmission lines, and are proposed and applied from the perspective of ensuring all power transmission needs of the power plant. of. [0004] Figure 1a It is a sch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCH02J3/1807Y02E40/30
Inventor 王绍德
Owner NORTH CHINA POWER ENG