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Unified power flow controller and multi-section power flow control method for double-circuit lines

A technology of power flow controller and double-circuit line, which is applied in the direction of AC networks with the same frequency from different sources, can solve the problems of less research on cross-section power flow control, and achieve the effects of simple and practical methods, high utility and high reliability

Active Publication Date: 2020-05-19
XUJI GRP +2
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Problems solved by technology

[0004] At present, the researches on the section power flow control of the unified power flow controller at home and abroad are mostly focused on the near-end section, and the research on the control strategy of the unified power flow controller is mostly for the single-circuit line power flow controller, while for the double-circuit line and There are few studies on section power flow control of multi-section unified power flow controllers

Method used

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  • Unified power flow controller and multi-section power flow control method for double-circuit lines
  • Unified power flow controller and multi-section power flow control method for double-circuit lines
  • Unified power flow controller and multi-section power flow control method for double-circuit lines

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] Such as figure 1 Shown is a basic structure of the unified power flow controller applied to double-circuit lines: the parallel side is connected to the AC bus, the series side includes two sets of converters, and the two sets of series-side converters are respectively connected to one of the double-circuit lines.

[0027] As for the structure of the unified power flow controller applied to double-circuit lines, other structures introduced in "Structure Optimization Analysis of the Unified Power Flow Controller Applicable to Double-circuit Lines" (Power System Automation, Issue 21, 2015) can also be used. The unified power flow controller can adopt the unified power flow controller MMC-UPFC or three-phase full-bridge UPFC based on modular multi-level technology.

[0028] Such as figure 1 , the system includes two or more distal sections and one proxim...

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Abstract

The invention relates to a double-circuit line unified power flow controller and a multi-section power flow control method. According to the technical scheme of the invention, the transmitting power at a distal-end section and the transmitting power at a proximal-end section are monitored at the same time. For any circuit line, on the condition that the power at the distal-end section is out-of-limit, the transmitting power is increased by the unified power flow controller. On the condition that the power at the proximal-end section is out-of-limit, the transmitting power is reduced by the unified power flow controller. The control method of the invention is simple, practical and high in reliability. Based on the method, the power of the distal-end section, the power of the proximal-end section and the power of the line can be monitored at the same time, so that the line transmitting power is ensured not to exceed the limit. Meanwhile, the unbalanced power flow phenomenon between the distal-end section and the proximal-end section is effectively inhibited, so that the maximum effectiveness of the unified power flow controller system is realized.

Description

technical field [0001] The invention relates to the field of power flow control of a unified power flow controller, in particular to a multi-section power flow control method. Background technique [0002] With the rapid development of the power system, its operational flexibility, controllability and stability have become more and more urgent problems to be solved; large-scale distributed energy sources such as solar energy and wind power are connected to the power system, which further increases the security of the system. The complexity of power flow regulation. In addition, there are many long-distance transmission lines in my country, and the power grid structure is relatively weak. It can improve the power transmission capacity of existing lines and maximize the transmission capacity of the power grid; improve the transient stability of the power system and damp system oscillation; optimize the power flow and reduce circulation. Reducing network loss and so on puts for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06
CPCH02J3/06
Inventor 严兵郝俊芳张群郭宏光王亚涛赵倩于海郭虎锋
Owner XUJI GRP
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