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When load currents or source voltages are unbalanced or distort, UPQC can supply the load for balance and fundamental voltages, as well as the same type of currents for power sources, In this sense the compensation purpose of UPQC can be regarded as waveform compensations. This paper firstly introduced the p-q-r theory and its power definition, based on that, the improved p-q-r theory was proposed...
Power system engineers are currently facing challenges to increase the power transfer capabilities of existing transmission system. This is where the power electronic Flexible AC Transmission Systems (FACTS) technology comes into effect. Simulation tools are available to check the influence of a FACTS device on the power system. In this paper we have tried to explain the different FACTS devices both...
Reactive power injection has been the common practice to stabilize and support the voltage in electric power systems and its provision was traditionally considered to be part of the duties of the units dispatching active power. This article proposes the provision of reactive power by electric loads which are interfaced to the grid by active rectifiers that enable them to inject reactive current to...
This paper develops a voltage/frequency regulation scheme for an islanded distributed energy resource (DER) unit. The DER can be either a distributed storage (DS) unit or a dispatchable distributed generation (DG) unit. The DER unit is represented by a (time-varying) DC voltage source that is electronically interfaced to an aggregate of loads. The electronic interface consists of a voltage-sourced...
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