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This paper gives the State Space modeling of Distribution Static Synchronous Compensator (D-STATCOM). It is important to keep the voltage constant in the distribution system, hence voltage regulation is required in the distribution network. Voltage Source Converter (VSC) based D-STATCOM achieves voltage regulation in the connected bus by absorbing/supplying the required reactive power. The capability...
One of the most important operational requirements for any electrical power network for both distribution and transmission level is voltage control. Many studies have been carried out to improve or develop new voltage control techniques to facilitate safe connection of distributed generation. In Saudi Arabia, due to environmental, economical and development perspectives a wide integration of photovoltaic...
One of the most important operational requirements for any electrical power network for both distribution and transmission level is voltage control. Many studies have been carried out to improve or develop new voltage control techniques to facilitate safe connection of distributed generation. In Saudi Arabia, due to environmental, economical and development perspectives a wide integration of photovoltaic...
The problem of voltage sags and Swells and its severe impact on sensitive loads is well known. To solve this problem, custom power devices are used. One of those devices is the Dynamic Voltage Restorer (DVR), which is one of the most efficient and effective modern custom power devices used in power distribution networks. This paper described DVR principles and voltage correction methods for balanced...
This paper presents control methodology of UPFC (unified power flow controller) for stable operation of distributed generators on distribution system. The UPFC consists of two parts, shunt and series compensation parts. The shunt part controls the power flow from the power system to be constant. The series part compensates unbalanced voltage and voltage sag. In addition, the proposed UPFC keeps operation...
In this paper, a new control strategy based on current mode control for dynamic voltage restorer (DVR) is proposed to mitigate the power quality problems in the supply voltage. The DVR is controlled indirectly by controlling the supply current. The reference supply currents are estimated using the sensed load terminal voltages and the dc bus voltage of DVR. The control scheme is based on synchronous...
In this paper a comprehensive equivalent model for a distribution system and statcom dynamics is proposed based on the state voltages and currents. Also a novel and efficient linear feedback control strategy based on utilizing quasi steady state solution, as reference signals, is represented. In order to design load and dc bus voltage transfer functions, a composite 'Lead Phase and Pole Placement'...
The dynamic voltage restorer (DVR) is used to regulate the voltage at the load terminals from various power quality problems like sag, swell, harmonics, unbalance etc., in supply voltage. In this paper, a novel control strategy is proposed to control a capacitor supported DVR for sag, swell, harmonics and unbalance in supply voltage. The reference signal for the series connected DVR is obtained indirectly...
This paper provides a comparative performance evaluation of four different reactive power compensation approaches for a stand-alone wind energy conversion system (WECS), composed of a wind turbine and a squirrel-cage induction generator (SCIG), and feeding a constant balanced 3-phase inductive load. The reactive power compensation schemes investigated are: fixed-capacitor bank, switched-capacitor...
This paper discusses a frequency estimation strategy that, when used in conjunction with dynamic voltage restorer (DVR), can hold the magnitude of any distribution bus voltage constant as the supply frequency varies. First the impact of supply frequency variation on the performance of a DVR is illustrated. It has been shown that if a DC battery supplies the DVR, the battery ends up supplying the real...
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