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Selection analysis method for equivalent capacitance at DC side of UPFC (Unified Power Flow Controller)

A technology of equivalent capacitance and analysis method, applied to AC network circuits, circuit devices, AC networks with the same frequency from different sources, etc., can solve problems such as unfavorable UPFC safe operation, sudden rise (or sudden drop) of DC side voltage, etc.

Inactive Publication Date: 2017-09-29
JIANGSU ELECTRIC POWER CO +2
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  • Abstract
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  • Claims
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Problems solved by technology

UPFC fast power flow control will cause voltage fluctuations on the DC side, because the voltage injected into the series side and the line current will generate a certain amount of active power, and this part of power will flow into (or flow out of) the DC side capacitor during the transient process; if the power value Larger, it will cause a sudden rise (or slump) of the DC side voltage, and the overvoltage of the DC side is not conducive to the safe operation of the UPFC, so it is necessary to study how to select a suitable capacitor value to avoid its occurrence

Method used

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  • Selection analysis method for equivalent capacitance at DC side of UPFC (Unified Power Flow Controller)
  • Selection analysis method for equivalent capacitance at DC side of UPFC (Unified Power Flow Controller)
  • Selection analysis method for equivalent capacitance at DC side of UPFC (Unified Power Flow Controller)

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Embodiment Construction

[0036] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] Such as figure 2 Shown, the selection analysis method of UPFC DC side equivalent capacitance of the present invention comprises the following steps:

[0038] (1) Deduce its mathematical model and converter control model according to the basic structure of UPFC.

[0039]1.1 The VSC electromechanical transient model of UPFC is derived from the low-frequency dynamic mathematical model.

[0040] 1.2 In order to facilitate the analysis and independent control of each physical quantity, the three-phase time-variable transformation is subjected to Park transformation to obtain the physical quantities in the two-phase d-q rotating coordinate system perpendicular to each other, and the mathematical model of VSC in the synchronous d-q rotating coordinate s...

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Abstract

The invention provides a selection analysis method for equivalent capacitance at the DC side of a UPFC (Unified Power Flow Controller), which explains a relation between the active power flowing through a series-side converter and the power of a line inductor in the transient process of UPFC power flow control. Certain active power transmission is generated in the UPFC in the power flow control, the parallel-side capacity can be low when a DC-side capacitor provides transient power and the parallel side only provides steady-state power; and the capacity of a parallel-side converter should comprise the sum of the transient and steady state power in order to stabilize the DC-side voltage. Therefore, the selection analysis method provides a basis for capacitance selection analysis for the UPFC.

Description

technical field [0001] The invention belongs to the technical field of flexible power transmission and distribution of power systems, and in particular relates to a method for selecting and analyzing equivalent capacitance on a UPFC DC side. Background technique [0002] Since Dr. Gyugyi of Westinghouse Science and Technology Center in the United States proposed the concept of Unified Power Flow Controller UPFC (Unified PowerFlow Controller) in 1991, many scholars have begun to devote themselves to its research. As the most complex and attractive compensator in the flexible AC power transmission family, UPFC can control the impedance, phase angle, active power and reactive power on the power line in any combination. It integrates multiple functions and has a strong flexibility. The American Electric Power Company installed the world's first UPFC in the INEZ area in eastern Kentucky in 1998. As the world's largest inverter, it has a control capability of 640MVA and has attra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 窦飞汪惟源徐政盛能进蔡晖杨林朱寰高骞黄河
Owner JIANGSU ELECTRIC POWER CO
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