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The voltage at the point of common coupling (PCC) in a weak network is very sensitive to load changes. A sudden change in active load will cause both a phase jump and a magnitude fluctuation in the bus voltage, whereas reactive load changes mainly affect the voltage magnitude. With the addition of energy storage to aActive Power Conditioner (APC), it is possible to compensate for the active power change as well as providing reactive power support. In this paper some effective active power compensation schemes are proposed. Simulation results are also presented showing the benefits of active power compensation to certain applications with phase sensitive load. This paper presents a novel control strategy for achieving maximum benefits from these grid-interfacing inverters when installed in 3-phase 4-wire distribution systems. The inverter is controlled to perform as a multi-function device by incorporating active power filter functionality. The inverter can thus be utilized as: 1) power converter to inject power generated from RES to the grid, and 2) shunt APF to compensate current unbalance, load current harmonics, load reactive power demand and load neutral current. All of these functions may be accomplished either individually or simultaneously. This new control concept is demonstrated with extensive MATLAB/Simulink. Finally the proposed shceme is applied for both unbalanced linear and non linear loads.

Keywords

International Electro-Technical Commission (IEC), Power Quality, wind Generating System (WGS)

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