Impact of Transmission Network Reinforcement on Improvement of Power System Voltage Stability and Solving the Dynamic Delayed Voltage Recovery and Motor Stalling Problem After System Faults in the Saudi Electricity in the Western Region

The Saudi Electricity company power system in the Western Region of the Kingdom (SEC-WR) is unique in its load pattern, growth trends and type, generation recourses and network configuration. The power system of the SEC-WR faced and is facing a high load growth. The high load increase gives rise to a very high loading of the transmission system elements, mainly power transformers and cables. The Western Region load is mainly composed of air conditioner (AC) during high load season. In case of faults this nature of load induces delayed voltage recovery following fault clearing on the transmission system. The sustained low voltage following transmission line faults could cause customer interruptions and may be equipment damage. The integrity of the transmission system may also be affected. The transient stability of the system may be affected. This may also influence the stability of the generating units in the system. The existing dynamic model of SEC-WR System has been described. The response of the model to the actual faults is compared with actual records obtained from the dynamic system monitor (DSM) installed in several locations in the SEC-WR System. The solution of the delayed voltage recovery problem after system faults may be achieved by reinforcement of the system, adding static VAr compensators (SVC) to provide the dynamic reactive power support to the system, reducing the fault clearing time and by under voltage load shedding. This paper analyzes and discusses the first alternative, the system reinforcement