Power quality

Smart grid consists of many parts, can be divided into: smart substation, smart distribution network, smart energy meter, intelligent interactive terminal, intelligent scheduling, smart home appliances, smart buildings, smart city grid, smart power generation system, new energy storage system.

Active power filter (APF) is a kind of power electronic device which can dynamically suppress harmonics and compensate reactive power. It can control and actively output the size, frequency and phase of the current by sampling the load current and separating each harmonic and reactive power, and respond quickly to offset the corresponding current in the load to achieve dynamic tracking compensation, and can complement both harmonic and reactive power and unbalance.Static reactive power generator (SVG) is connected to the power grid in parallel to adjust the phase and amplitude of the output voltage, so that the circuit can absorb or output the required reactive power to achieve the purpose of dynamic reactive power compensation. SVG is the best scheme in the field of reactive power control. Compared with the traditional modulation camera, capacitor reactor and traditional SVC with thyristor control reactor TCR as the main representative, SVG has incomparable advantages.