Comparison of converter arrangement of series and shunt converters in UPFC for distribution system control

A New Protection Scheme for an SSSC in an MV Network by Using a Varistor and Thyristors

“…Ri is the thermal resistance and τi is the time constant of each section in the Foster network, which are provided in the device datasheets (τi = Ri Ci) and as shown in Table 2. The junction temperature can be calculated as follows: (1) where Zthj(t) is the total thermal impedance, Tcase is the case temperature, Tvj is the junction temperature and P(t) is the power loss. For the IGBT:…”

“…Other network management techniques to ease these situations include the unified power flow controller (UPFC), static VAR compensator (SVC), soft-open point and transformer on-load tap changing. The UPFC is described as 'universal' due to its ability to independently control the real and reactive power flows [1]. The series insertion of a voltage, like in an SSSC, is most effective and many studies have been carried out to find the optimal sizing and allocation in terms of cost and dynamic response [2,3].…”

Analysis of DC offset in fault current caused by machines in a medium voltage distribution network

“…Nowadays distributed generation systems (DGs) such as combined heat and power (CHP) units, photovoltaic (PV) and wind power generators have been on the rise. The increase of distributed generation causes several side effects which have been intensively studied, including reverse power flows and voltage fluctuations in power distribution networks [1]. Indeed, DGs have great influence on the distribution network's feasible operating region, stability, reliability and efficiency, which eventually puts a restriction on the DG penetration level.…”

Utilizing Spare Inverter Capacity for Distribution Grid Voltage Support: An Adaptive Control Scheme

“…These include using dynamic voltage restorers (DVR) [4], which use a transformer with one winding connected in series with the line and the other winding connected to a power converter which can inject a controlled voltage when required. Unified Power Flow Controllers (UPFC), which have similarities to both DVRs and STATCOMs, have also been suggested for distribution network control [5], [6]. D-STATCOMs, which are STATCOMs optimised for use on distribution systems, have also been proposed [7]- [9].…”