Distribution network protection considering grid code requirements for distributed generation
The amount of inverter-based distributed generation connected to the low and medium voltage levels is increasing rapidly. Their growing impact on the power system has already driven some distribution network operators to start imposing requirements on their operation similar to those described in transmission grid codes. This study studies how different grid code requirements can affect the fault current levels in the distribution network and explores the possibility of using the grid code requirements to ensure the reliability and selectivity of the protection of distribution feeders.
In order to improve the reliability of a power system,this article talks a power BIT system and it's a hardware and software design.This system whose design is based on the power system characteristics uses DSP chip TMS320F2812 as the core of control circuit.The main control circuit and communication circuit of the hardware circuit are introduced particularly.This article also gives the function and implementation of the software and a typical flow chart of a certain processing.It has been proved in practical application that the use of the DSP chip simplifies the external circuitry,reduces power consumption and is able to make the system accomplish airplane power Built-in-test task reliably with high precision.