Research And Design Of Dynamic Reactive Power Compensation Controller Coordinated Control By DSP&FPGA

Reactive power is necessary for normal operation of many electricalequipments as well as industrial and life electronic devices. It’s unreasonable anduneconomic if the reactive power has a long-distance transmission from the generatortoday in advocating energy saving. It will lead to an increase in consumption, thequality of the supply voltage drop and decrease the power factor. Most power supplystations are equipped with the reactive compensation device which can onlycompensate the reactive power in front of the transmission line. But the factories andresidential communities have a large number, the demand of the reactive power isquite large and the supply power requires high quality also. If the reactive power cannot be compensated in time, it will cause great power loss and voltage drop and somelow-power factor factory users face fines. The controller is the most important part inthe power compensation device, so the paper design a dynamic reactive powercompensation controller which runs in low voltage environment.The control object of dynamic reactive power compensation controller isTSC-type SVC devices. This paper designs a new voltage and current samplingcircuit of controller hardware independently. FPGA has many advantages in purelogic hardware and flexible reconfiguration. In order to reduce the burden of DSP,improve the system speed, free the DSP from time-consuming workload and largemultiplication and division operation, the paper designs single float multiplication anddivision unit using top-down modular design method. DSP is responsible only for thesimple addition and subtraction operations and coordinating the work of the entiresystem, such as display, A/D conversion, key scan, output control andcommunications etc. The digital tube of4group4displays real-time the values ofvoltage, current, reactive power, active power and power factor. The paper uses theinstantaneous reactive power algorithm to calculate reactive power directly insoftware. The method is advanced as opposed to FFT algorithm or traditional powerfactor detection which needs to detect the phase of voltage and current. There are twoinstantaneous reactive power algorithms according to the collected differentparameters in the paper. The instantaneous reactive power algorithm can immediatelyget the reactive power in power line after the hardware circuit collects parameters.Then the controller switches capacitor banks to compensate reactive power after thejudge of nine districts control strategy. This paper presents the concept of reactivepower compensation capacity weight. It can manually set the value of each set ofequipment and flexible configuration of reactive power compensation capacity whenmany sets of equipment use of the controller runs parallel.The simulation model of system is built by SIMULINK with dynamic inductiveloads. The instantaneous reactive power can be detected accurately and be dynamic compensation. The improvement of power factor proves that the desired requirementis achieved.