This paper presents a development of power electronic control device so called Solid-State Circuit Breaker (SSCB) for protection system. This SSCB acts as switching device in order to "turn-on/turn-off' the circuit in low voltage distribution level.The protection system is separated into two parts that are switching circuit and real time fault detection circuit. The real time detection circuit can investigate five different cases as short circuit, overload, undervoltage, overvoltage and leakage current.The voltage and current signals investigated and compared between normal and abnormal situation by using microcontroller as system complies. During abnormal situation, the control device can send the signal to switching circuit in order to isolate the abnormal circuit and protect the system from severe damage.The results show that both control and switching circuits can detectfaults and protect the system according to the designed conditions.

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This paper describes analysis and control design of a distribution level static synchronous compensator (DSTATCOM) to control the voltage at the PCC in order to keep the power constant at the load from intermittent wind speeds. For fast response requirement, a feedforward compensation scheme is derived and employed in the paper. Firstly, the mathematical model of the DST ATCOM is derived. Then the compensation principle is described with applying RDFT in order to immune any undesired signals. Accordingly, a hardware prototype is built with a fix-point DSP TMS320F2812-based system. Use of a current-controlled PWM inverter as the power stage of the DSTATCOM generates needed compensation currents for real-time load compensation. Finally, experimental results confirm the performance of the proposed DSTATCOM.