Modular Network Reactive Power Compensation Device Research And Development

Reactive power is necessary for the normal operation of power equipment in power grid power component. In the existing power grid, especially the part of 0.4 KV low-voltage power grid, generally exist the system reactive power compensation, power grid power factor low, lead to low voltage network energy loss is bigger, the economy is poor. Therefore, the study of reactive power compensation in the low voltage power grid technology, i mprove the power factor of low voltage power grid, on our country’s has a very important role and significance of energy conservation and consumption reduction.The traditional reactive power compensation device to thyristor switch, the control unit and condenser fragmented along the power distribution cabinet, a controller to control many sets of capacitors, once the controller failure, the device does not work. This paper developed an intelligent reactive power compensation device, separate for each capacitor configuration controller and field bus communication function, reactive power compensation device of network modularity, not only in the power distribution ark can adopts modular structure, strengthened the system reliability, but also in low voltage power grid side branch and special electric equipment configuration the reactive power compensation device remote network modularity compensation control, improve the quality of low voltage power grid.In this paper the research developed a multi-function, high performance network modular type reactive power compensation device. The device adopts the embedded structure, using SOC platform technology, STM32 processor as the core, carry through the address/data bus for electric energy metering chip ATT7022 D, a relatively complete system hardware circuit design, mainly divided into the power supply module, data sampling module, capacitor switching module, display module, etc. To meet the application requirements of convenient expand compensation capacity, dynamic reactive power compensation, in the above complete, on the basis of reactive power compensation controller design based on the RS485 communication interface of the controller, design module connected to the Internet more runtime coordination, reactive p ower compensation scheme, building contains multiple modules of networked intelligent reactive power compensation system, realizing the network communication, coordination between multiple modules to expand reactive compensation capacity. In terms of the s ystem software design, in this paper, the principle of modular design, selection of C language programming, can effectively improve the reliability of devices and easy maintainability. Adopted in the design of voltage- reactive power as a reactive compensation criterion, using compound switching control of compensation capacitors quickly, no impact for.Harmonic detection algorithm, the design of the sampling data processing three times of Lagrange interpolation algorithm is introduced to detect the sample s values for processing, to deal with the data using modified fast Fourier transform is analyzed, such not only greatly simplifies the harmonic analysis of the process to overcome the due to frequency drift data points the problem of insufficient sampling, but also overcome the leakage problem. Aiming at capacitor model, size, location in distribution network optimization configuration problems such as improved particle swarm(PSO) algorithm is proposed, and the distribution of the most appropriate capacitor compensation capacity and compensation position and the best optimized calculation. And through the on IEEE33 nodes distribution system in the MATLAB simulation, to verify the improved particle swarm-differential algorithm in power capacitor effectiven ess and practicability of the optimization of the configuration process.Finally, the design of reactive power compensation device was tested in this paper, analysis, and on the paper work is summarized and prospect on the development of reactive power com pensation device and technology trends were discussed.