Power quality improvement economical solution In practical application, the traditional passive filter capacitor compensation and passive filter are commonly used in quality management, Green Power APF and SVG can work together with traditional method, realize more reliable, more convenient and more economic compensation, which is our unique solution for power quality improvement.Capacitor reactive power compensation+SVGThe traditional reactive power compensation adopt slow switching device for capacitor switching, there is problem of differential compensation, poor compensation accuracy, slow response speed. SVG adopts high speed switching device to generate the compensation current, without the problem of compensation accuracy and slow response. For low cost considerations, most or half compensation is compensated by capacitor groups, the remaining is completed by SVG, which ensure smooth compensation, also low cost, namely SVG+C method. Dynamic reactive power compensation method comparisonNameTSCSVG+CSVGOutput reactive powerGroup switching, rough compensationLinear output, accurate compensationLinear output, accurate compensationCompensating effect0.9 above0.99, could be partially sensitive0.99, full resistive to full capacitiveTotal response time>100ms>30ms<10msFilter abilitynoPartial specified harmonic2-13 harmonicThree-phase unbalancenoObvious effectThoroughly solve three-phase unbalancedSupport voltagenoPartial capacity support voltageFull power support voltagePriceRelative lowThe cost is little higher than TSCHigher than TSC Traditional Passive filter+APF The traditional harmonic compensation is the passive filter of the capacitance and resistance, which has the disadvantages of low compensation precision, slow response, poor reliability and limited harmonic compensation. APF adopts high speed switching device to generate the compensation current, there is no compensation accuracy problem, and also has fast response. For low cost considerations, use passive filter to compensate main low harmonics, the remaining harmonic is compensated by APF, to ensure smooth compensation, and also with low cost, that is APF+LC. In the combined compensation, APF compensated harmonic should avoid LC compensated harmonic, otherwise the compensation has no effect. Advantages of GP APF/SVG+traditional compensation More reliable Can be in parallel with any form of C/TSC/LC. In practical application, users with traditional power quality management have a variety of forms, a pure capacitor C, series connection 0.4%~14% reactor TSC, passive filter LC, GP power quality products adopt the methods such as suppression of resonance peak, shielding specified harmonic output etc., and ensure reliable running when parallel connection with any passive devices. Especially in parallel with the pure capacitor C, the suppression of resonance technology reaches international advanced level. More convenientCan coordinate with any C/TSC/LC, regardless the main line at any location, CT at any location, can be reliable operation. Does not need to know the current of C/TSC/LC, and L can take from 0 to any value. SVG is close to the load side, can compensate low harmonics and three-phase unbalance, but compensation for reactive power, due to the faster speed of SVG, will precede the action of capacitors, therefore when SVG for reactive power compensation occasions, recommend SVG near the grid side. APF/SVG and LC position relationMain line positionActive CT Sampling pointPassive formActive near grid side Passive close to load sideActive close to load side Passive close to grid sideAPFEffective compensationEffective compensationOptional power grid side or load sideL could be 0~ arbitrary value C can be any switching formSVGEffective compensationCan effectively compensate low degree harmonics and 3 phase unbalance, but with the capacitor to compensate reactive power is not economicalNoteactive and passive parallel, APF should avoid passive filter compensating harmonic frequency.More economical SVG can be parallel connected with capacitor with same size, to achieve maximum single cabinet power density, lower cost, more economical. The compensation effect and the response speed are all equal to the effect of reactive power compensation using SVG. Can also be used as a component, integrated in power distribution cabinet with other TSC/LC, to increase power density. We can provide custom solutions of integrating in distribution cabinet with other suppliers LC.
