A Study of Power System Voltage Stability Monitoring and Control Based on Wide Area Measurement System
Date Issued
2014
Date
2014
Author(s)
Su, Heng-Yi
Abstract
The aim of this dissertation is to study the power system voltage stability monitoring and control based on wide area measurement system. First, we propose an efficient method for the computation of static voltage stability margin in a power system. The proposed method combines Thevenin equivalent network approach with cubic spline extrapolation technique to accelerate the continuation power flow (CPFLOW) algorithm to quickly determine the voltage collapse point. With this new method, power system operators are able to accurately and rapidly recognize how far the system is away from a possible instability event. In order to achieve better voltage regulation in power systems, a new adaptive control approach to power system secondary voltage control (SVC) problem is presented. The proposed method is able to maintain system voltage profile at acceptable level across the entire power grid. The proposed method is adaptive in the sense that load reactive power disturbance is estimated on-line for computing the adaptive control inputs. Moreover, the computational burden of the proposed method is low to make it suitable for on-line applications. For secure grid operations, a synchrophasor based wide area voltage stability monitoring and control scheme is developed. The proposed scheme utilizes both synchronized voltage magnitudes of monitored buses and the index of voltage stability margin as trigger signals to optimally control reactive power sources to achieve reliable and efficient voltage profile/stability regulation in power systems. All the methods mentioned above are evaluated with extensive simulation studies. The test results are promising and confirming the effectiveness of the proposed methods.
Subjects
靜態電壓穩定度
電壓穩定度裕度
電壓穩定度監測
二次電壓控制
廣域量測系統
同步相量
Type
thesis
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