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Effect of Secondary Voltage Control on Static Voltage Stability

Author: GuoHongYi
Tutor: LiuMingBo
School: South China University of Technology
Course: Proceedings of the
Keywords: Secondary Voltage Control Static Voltage Stability Continuation Power Flow Reactive Power Coordination Factor
CLC: TM761
Type: Master's thesis
Year: 2011
Downloads: 26
Quote: 0
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Abstract


Automatic voltage control is an effective method to coordinate the voltage control and avert voltage collapse, and the power system has a pyramidal structural, which is primary, secondary and tertiary control level. And the secondary voltage control is the most important part in automatic voltage control. It main work is in charge of parameters setting of the first voltage controllers in the controlling area by way of harmony. And this controlling method can get satisfactory result in the aspects of improving system voltage level and maintaining enough reactive deposit, so it is effective controlling method used in controlling voltage and controlling reactive power in power system.In this paper, the network partitioning, pilot bus selecting and control scheme of secondary voltage controlling were summarized. Static stability margin is the important indicator of static voltage stability of power system. Continuation power flow is very effective in analyzing the stability of voltage, and it can calculate the static stability margin and give the P-V curve. In order to analyze the static voltage stability with secondary voltage control, this paper focuses on how to build the model of continuation power flow in presence of secondary voltage control. This paper presents the model of power flow with secondary voltage control. Base on that, a continuation power flow model in presence of secondary voltage control is established, and also how to handle the violation of reactive power limits of generators and the voltage limits of the controlled generators in this model is given.Computational results on IEEE 39-bus system demonstrate that the secondary voltage control can enhance the static voltage stability margin and postpone occurrence of this case that generators violate their reactive power limits during load increase. However, if the reactive power coordination factor in each control area is defined by means of the balance mode of reactive power outputs of generators, voltage collapse will occur because these generators in the same area violate their reactive power limits simultaneously.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system automation > Automatically adjusts
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