Investigation of Improving High Voltage Transmission Rotor Angle and Voltage Stability with Distributed Generation Resources

摘要

There are increasing costs associated with utility electricity generation and increasing requirements to meet more stringent environmental regulations. These influences have contributed to a recent increasing trend of generating power locally at distribution voltage level using non-conventional resources. The impact of this technology on existing high voltage electrical transmission networks needs more attention. This paper considers a high voltage electrical transmission network feeding a distribution load center with distributed resources and demonstrates using simulation tools how these distributed resources can be used to improve high voltage transmission network limitations including rotor angle and voltage stability. Load flow and stability models were developed to represent transmission networks with first swing stability limitations and voltage instability or delayed voltage recovery. Within these models, distributed generation resources were simulated using a voltage source inverter control model. The results indicated that distributed resources can be used to improve the transmission performance under conditions when the voltage source inverters associated with those resources included a minimum power factor and low voltage ride through capabilities. Thus utilities can avoid costly correction methods for these issues with minimum capability requirements for distributed resources.