Comparison of shunt capacitor SVC and STATCOM


Comparison of shunt capacitor, SVC and STATCOM in static voltage stability margin enhancement

Arthit Sode-Yome and N. Mithulananthan

Electric Power System Management, Energy Field of Study, Asian Institute of Technology, P.O. Box 4, Klongluang, Pathumthani 12120, Thailand


Abstract This paper compares the shunt capacitor, SVC and STATCOM in static voltage stability improvement. Various performance measures are compared under different operating system conditions for the IEEE 14 bus test system. Important issues related to shunt compensation, namely sizing and installation location, for exclusive load margin improvement are addressed. A methodology is also proposed to alleviate voltage control problems due to shunt capacitor compensation during lightly and heavily loaded conditions.

Keywords loading margin; remote voltage control; shunt capacitor; STATCOM; SVC

Modern electric power utilities are facing many challenges due to ever increasing complexity in their operation and structure. In recent years, one problem has that received wide attention is voltage instability.1–5The lack of new generation and transmission facilities, and overexploitation of existing facilities together with the increase in load demand make these problems more likely in modern power systems.

V oltage stability is the ability of a power system to maintain adequate voltage magnitude so that when the system nominal load is increased, the actual power trans-ferred to that load will increase.3,6The main cause of voltage instability is the inabil-ity of the power system to meet the demand for reactive power.3V oltage instability is the cause of system voltage collapse, in which the system voltage decays to a level from which it is unable to recover. V oltage collapse may lead to partial or full power interruption in the system.

There are two types of voltage stability based on simulation time; static voltage stability and dynamic voltage stability. Static analysis involves only the solution of algebraic equations3,7,8and therefore is computationally less extensive than dynamic analysis. Static voltage stability is ideal for the bulk of studies in which a voltage stability limit for many pre-contingency and post-contingency cases must be determined.

Providing adequate reactive power support at the appropriate location solves voltage instability problems. There are many reactive compensation devices used by the utilities for this purpose, each of which has its own characteristics and limi-tations.9However, the utility would like to achieve this with the most bene?cial com-pensation device. Hence, this paper compares the advantages and disadvantages of the currently available and most commonly used shunt-compensation devices. International Journal of Electrical Engineering Education41/2

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