Study On The Devices Of Static Var Compensation (SVC) Based On DSP

Reactive power is an important factor to the voltage stability, and it is also related to secure and steady operation of the electric power systems.Reactive power compensation is one of the potent methods of maintaining the effective and reliable operation of the electric power system.In terms of the developmental actuality of reactive power compensation device in electric power system, a kind of TSC(Thyristor Switch Capacitors) device is designed.The dissertation mainly include the followed parts: the improvement of the electric net's capability by the reactive power compensation, the control method and principle of reactive power compensation device and the hardware and software design of the device.A high performance digital signal processor TMS320F2812 is as the controller's CPU.DSP has many merits such as high operating speed and high real-time.In this paper, the technology of self-adapt modulate sampling time and FFT(Fast Fourier Transform)algorithm are both adopted, which can realize auto-tracking the change of frequency and compensate dynamically reactive power.The system adopt SSR (Solid State Relay) which has zero voltage inspection circuit as switch.By means of zero-crossing triggering of switch, it realize the capacitor's speediness ,no arc, no impact switching.On the basis of analyzing different kinds of control method of var compensation, the paper take into account the both of voltage and var.The control method is based on the 11 plot picture.Comparing with familiar control method considering power factor, this method avoids the switch oscillation on the condition of light loading and make reactive power adjustment more reasonable.