The Design Of Static Var Compensating System And It’s Network Control Method

A growing number of power electronic devices, arc furnaces and electrified railway have caused reactive power loss and three phase unbalance to the poer grid, which deteriorate the power quality. Static Var Compensator (SVC) is capable of outputting rapid, continous, adjustable reactive power and controlling three phase independently, it has a especially good performance on compensating the loads with rapid reactive power variation and three phase unbalance, such as arc furnaces and electrified railway. The great development of computer and communication technology have made the network application pervade globally in every aera. The combination of SVC and network control can make reactive power compensating more flexiable and realize the global reactive power optimization of the power grid, this put a realistic significance on the network control of SVC.First of all, the compensating algorithm of SVC is researched in this thesis. Based on the method of three phase unbalance compensating, the comparisons of several frequently used compensating algorithm are made, then an algorithm that extracts active power current and reactive power current using vector orientation is researched and analysised. This algorithm is then proved to be pratical and advanced through mathematical reasoning and simulation.Secondly, the design of SVC controller based Data Signal Processor (DSP) and MCU is provided. The hard ware design using the idea of modularization, it includes the design of mutual inductor module, DSP sampling module and pulse generateing module along with their operating principle. The test result of the circuit board verifies the proper functioning of the design. The software section includes the software process design and the software optimization methods. The software optimization uses the internal structure and functions of DSP TMS320F2812to achieve the purpose of increasing the executing speed and stability of the software. Followed the controller design is the simulation and analysis of SVC system with simulink in matlab, the simulation result proved that the SVC controller designed in this thesis can meet the requirement of compensating reactive power and three phase unbalance.At last, the network control of SVC is researched, provides the modeling and controller design of the SVC under a network with random network induced delay, the simulation of the model and controller proves that the controller can stabilize the SVC network control system with random delay.