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Node current injection method-based modeling method of unified power flow controller

A technology of power flow controller and node current, which is applied in the direction of instruments, electrical components, circuit devices, etc., and can solve problems such as large errors

Inactive Publication Date: 2014-10-22
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

These methods have relatively large errors, especially when UPFC is represented by an equivalent generator, the error is obvious

Method used

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  • Node current injection method-based modeling method of unified power flow controller
  • Node current injection method-based modeling method of unified power flow controller
  • Node current injection method-based modeling method of unified power flow controller

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Embodiment Construction

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0049] The modeling method of the unified power flow controller based on the node current injection method of the present invention, for the basic structure such as figure 1 The unified power flow controller shown in the figure is composed of two voltage source converters that share the DC side capacitor, in which the first converter is used to provide active power to the second converter to maintain a constant DC side voltage, and at the same time it is connected with the power The system exchanges reactive power to maintain a constant voltage of the parallel connection node of the unified power flow controller. The second converter is connected in series with the transmission line through a coupling transformer to provide a voltage phasor connected in series with the transmission line, and its amplitude variation range is 0 ~ V s...

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Abstract

The invention relates to a node current injection method-based modeling method of a unified power flow controller. For the unified power flow controller, a power flow control model of the unified power flow controller is established by the following steps: step one, establishing an equivalent circuit of the unified power flow controller; step two, for the equivalent circuit obtained by the step one, establishing an equivalent model expressed by a node current injection method so as to obtain an injected current of a parallel side node s and an injected current of a serial side node m of the unified power flow controller; and using the equivalent model and a corresponding injected current computational formula to obtain the power flow control model of the unified power flow controller. The method has the high adaptability; and the bus voltage control effect is good.

Description

technical field [0001] The invention relates to the technical field of power system simulation modeling, in particular to a modeling method of a unified power flow controller based on a node current injection method. Background technique [0002] Unified power flow controller (UPFC) is a type of flexible AC transmission system (FACTS), which can not only provide independently controllable parallel reactive power compensation, but also can inject phase angle unconstrained series compensation into the transmission line. Voltage, selectively control the voltage, impedance and phase angle of the transmission line, and realize the active and reactive power flow control of the transmission line. UPFC is a multi-functional controller with multiple control variables and multiple control objectives. Its main functions include power flow control, improving system transient stability and damping system oscillation. The composition of the unified power flow controller is mainly compose...

Claims

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Application Information

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IPC IPC(8): H02J3/00G06F17/50
CPCY02E60/00
Inventor 林因李传栋张芳
Owner STATE GRID CORP OF CHINA
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