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

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...

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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

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