Effects of STATCOM, TCSC, SSSC and UPFC on static voltage stability

Hybrid methodology for fault distance estimation in series compensated transmission line

“…The SSSC consists of a voltage source inverter (VSI) and a transformer connected in series with the line. An energy source is also connected for maintaining DC voltage across the capacitor and compensation of SSSC losses [19]. The operating condition is that the SSSC injects upto 10% of nominal voltage in quadrature with the line current and VSI operates with a constant conduction angle (sigma = 172.5°).…”

Power Flow Control using a Bidirectional Z-source Inverter–based Static Synchronous Series Compensator

“…The coefficients for equation (9) and (10) are defined as: b3=LLLC;b2=CLRL;b1=LL(2D-1) 2 +2L(1-D) 2 ;b0=RL(2D-1) 2…”

“…Also having increasing numbers of DGs, the whole power network structure becomes more complex, its stability margin may be narrowed and its robustness may be reduced. The Static Synchronous Series Compensator(SSSC), as one of the Flexible AC Transmission system (FACTS) [1,2] is effective in controlling power flow, and hence can reduce power flow in heavily loaded lines and can support voltages by controlling effective line series impedance, and improve the stability of the network. Most SSSCs use an H-bridge based voltage source converter (VSC) to inject a controllable voltage in series with the transmission line where it is connected.…”

Reactive power operability of distributed energy resources for voltage stability of distribution networks

“…Generally, the voltage stability of a distribution network needs to be maintained within certain operational limits, in order to avoid unacceptable voltage deviations on networks assets and customer connection points. As a result, the planning of reactive power compensation devices is a critical concern for improving the system resilience to voltage instability, enhancing the power transfer capacity and ensuring the power quality [4]. Hence, the research on conventional reactive power compensation devices to support system voltage stability has been widely conducted.…”