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Parallel operation SVC coordinated control system based on voltage adjusting rate

A coordinated control system and control system technology, applied in the direction of flexible AC transmission system, reactive power adjustment/elimination/compensation, etc., can solve the problems of wind farm safety level reduction, low power factor, current distortion, etc.

Inactive Publication Date: 2017-01-11
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of harsh environments or increased operating constraints, problems such as grid voltage, three-phase imbalance, current distortion, and low power factor will become prominent, and the safety level of wind farms will gradually decrease

Method used

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  • Parallel operation SVC coordinated control system based on voltage adjusting rate
  • Parallel operation SVC coordinated control system based on voltage adjusting rate
  • Parallel operation SVC coordinated control system based on voltage adjusting rate

Examples

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Embodiment

[0026] Embodiment: Parallel operation based on voltage differential ratio The SVC coordinated control system includes multiple SVC reactive power compensation devices (SVC 1, SVC2...SVCn) running in parallel, and each SVC reactive power compensation device is connected to the main transformer bus of the wind farm , each SVC reactive power compensation device is composed of SVC primary equipment (W1) and control system (W2), wherein W1 is connected to the 35kV side, and W2 is connected to the 220kV bus side.

[0027] Taking the branch SVC 1 as an example, the SVC primary equipment (W1) is composed of a filter branch (FC1) and a thyristor phase-controlled reactor branch (TCR1), and the control system (W2) includes a coordinated control system unit (U1), voltage regulation Coefficient setting unit (C1), SVC control device (S1) and trigger circuit (T1) four parts.

[0028] The other branches have the same structure as the branch SVC 1.

[0029] U1-Un, S1-Sn, T1-Tn in this applica...

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Abstract

The invention relates to a parallel operation SVC coordinated control system based on voltage adjusting rate. The system comprises a plurality of parallelly operated SVC reactive power compensation devices (SVC1, SVC2 ... SVCn), each of which is mounted on a main generator bus of a wind power plant and each comprises an SVC primary device (W1) and a control system (W2). The SVC primary devices (W1) are mounted to the 35kV side, and the control systems (W2) are mounted to the 220kV bus side. The method utilized and applied by the system comprises the steps: (1) detecting whether a coordination control system is running normally according to the data acquisition and analysis of the current grid condition and the status data of each parallel running branch SVC reactive power compensation device, and when the coordination control system is determined to run normally, a coordination control scheme is made, and reactive power compensation tasks are assigned to each SVC reactive power compensation device. According to the tasks, each SVC reactive power compensation device completes its own task to cooperated and complete the power grid requirements. The system can prevent the parallel running devices from falling into a chaotic situation after the coordination control drops out.

Description

technical field [0001] This application relates to a parallel operation SVC coordinated control system based on the voltage difference rate, which is suitable for the coordinated control of multiple SVC devices operating in parallel in the same section of the bus in wind farms. Background technique [0002] With the rapid development of clean energy, the large-scale centralized access of wind power puts forward higher requirements on the power grid. In the case of harsh environments or increased operating constraints, problems such as grid voltage, three-phase imbalance, current distortion, and low power factor will become prominent, and the safety level of wind farms will gradually decrease. Among the flexible AC control devices, SVC is the most widely used and mature reactive power and voltage control device in the power grid, which can quickly compensate reactive power and maintain grid voltage. [0003] At present, there are many kinds of SVC control technologies, and t...

Claims

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Application Information

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IPC IPC(8): H02J3/18
CPCY02E40/10
Inventor 于永军祁晓笑焦春雷亢朋朋
Owner STATE GRID CORP OF CHINA
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