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Low-voltage power distribution network multi-end combined power supplying structure based on IPFC

A low-voltage power distribution network and combined power supply technology, applied to AC networks, electrical components, circuit devices, etc. of the same frequency with different sources, can solve the problems of electromagnetic circulation and shortage of low-voltage parallel power supply reverse power operation, and avoid electromagnetic circulation. Circulation, increased capacity, easily compensated effects

Inactive Publication Date: 2017-07-18
ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an IPFC-based low-voltage distribution network multi-terminal joint power supply structure to solve the shortage of traditional transmission line compensation control in reactive power flow control, reverse power operation of low-voltage parallel power supply and electromagnetic circulation, etc. question

Method used

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  • Low-voltage power distribution network multi-end combined power supplying structure based on IPFC
  • Low-voltage power distribution network multi-end combined power supplying structure based on IPFC
  • Low-voltage power distribution network multi-end combined power supplying structure based on IPFC

Examples

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Embodiment 1

[0027] Take two 10kV feeders as an example (see figure 1 ); after the first 10 kV feeder passes through the feeder transformer, a coupling transformer is connected in series, and the AC side of the IPFC is connected to the low-voltage side of the feeder transformer through the coupling transformer; it is connected in series with the feeder transformer; the second 10 kV feeder passes through the feeder transformer Finally, connect a coupling transformer in parallel, connect the AC side of the IPFC to the low-voltage side of the feeder transformer through the coupling transformer, and connect it in parallel with the feeder transformer; finally realize the parallel connection with the ATS; the load is connected to the low-voltage bus through a switch.

Embodiment 2

[0029] For multiple power supply feeders, the present invention takes three groups of 10KV feeder lines as an example to illustrate:

[0030] An IPFC-based multi-terminal joint power supply method for low-voltage distribution networks. Specifically, the inter-line power flow controller IPFC is applied to the multi-channel low-voltage distribution network power supply. Different connection methods are used, one end is connected in series, and the other end is connected in parallel between multi-terminal power supply circuits. IPFC composed of three VSCs, three distribution transformers connected to different or the same 10kV feeder in groups and capacities, and three coupling transformers connected to the low-voltage side of the 10KV feeder transformer.

[0031] For an IPFC composed of three VSCs, two ends of the IPFC are connected in series, and one end is connected in parallel between multi-terminal power supply lines. Each VSC is composed of 8 IGBTs and 1 capacitor, forming ...

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PUM

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Abstract

The invention discloses a low-voltage power distribution network multi-end combined power supplying structure based on an IPFC. The structure comprises a first power supplying feeder line and a second power supplying feeder line. A double-power-supply automatic transfer switch ATS is connected between the first power supplying feeder line and the second power supplying feeder line. The first power supplying feeder line is serially connected with a coupling transformer. The second power supplying feeder line is parallelly connected with a coupling transformer. The interline power flow controller (IPFC) is connected between the two coupling transformers. The interline power flow controller (IPFC) is parallelly connected with the double-power-supply automatic transfer switch (ATS). The low-voltage power distribution network multi-end combined power supplying structure settles problems such as reactive power flow control shortage, low-voltage parallel power supplying reverse power operation and electromagnetic circulation in traditional power transmission line compensation control.

Description

technical field [0001] The invention belongs to the power supply technology, in particular to an IPFC-based multi-terminal joint power supply structure of a low-voltage distribution network. Background technique [0002] With the development of economy and society, the power system continues to expand, people's demand for power is increasing, and the requirements for power are getting higher and higher, which requires continuous improvement of the power supply quality of the power system. [0003] In terms of transmission line compensation control, the traditional control scheme cannot control the reactive power flow of the transmission line, and cannot properly balance the line load; at the same time, in the low-voltage parallel power supply system, the power supply is affected by the power supply voltage and phase, equivalent impedance and impedance angle. As well as the influence of many factors such as load size and power factor, reverse power operation may occur. In ad...

Claims

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Application Information

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IPC IPC(8): H02J3/04H02J3/00H02J3/26H02J3/18
CPCH02J3/0073H02J3/04H02J3/1821H02J3/26Y02E40/10Y02E40/50
Inventor 谈竹奎徐玉韬徐长宝肖永林呈辉桂军国王冕徐梅梅顾威刘斌胡实
Owner ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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