STATCOM Introduction STATCOM, also called SVG(Static Var Generator), is a power factor controller, used to improve power factor through compensating reactive power dynamically and accurately, to replace traditional capacitor bank or work together with capacitors. Phenomena caused by power quality problems Power factor is too low Because the motor etc. inductive load have inductive reactive power, resulting in low power factor, may be fined by government.The neutral current is too large Due to the third harmonic current and multiple of third harmonic current all conduct through the neutral line, so the neutral line current exceeds cable specification, resulting in cable overheat and safety potential danger.Reactive power compensation capacitor failure Because of harmonic is easy to have resonance with reactive power compensation capacitor, resulting in excessive current on capacitor, causing capacitance value decrease, liquid leakage etc. phenomenon, therefore, reactive power compensation capacitor could not work properly, seriously cause equipment damage because of too large resonant current.The transformer's capacity waste Reactive power and harmonic increase total power of the user, resulting in the capacity of the transformer is occupiedThe trigger device protection The peak of voltage and current harmonics is very high, which may exceed the protection value of equipment, which leads to the relay protection.The screen light flashes, affect the normal work Inverters and other uncontrolled rectification equipments will generate high harmonics, resulting in electric lights, computer screen flicker, affecting normal work.The Precision instrument can't work normally Some precision instruments are very sensitive to voltage and current fluctuations, and the requirement to power quality is very high, poor power quality will make these precision instruments can not work properly. Customer benefit of improving power quality using STATCOM Reactive power compensation Reduce user's electricity billsEnsure the power factor reaches national standard, to avoid government fine because of low power factorReduce line loss, reduce voltage dropIncrease the actual usage capacity of transformer and generator3 phase imbalance compensationAvoid the neutral line overheat and aging, and even the risk of fireAvoid partial voltage imbalance, causing the device false alarmAvoid high zero ground voltage causing the burnt risk of control system weak electricity facilitiesVoltage deviation control Avoid too high or too low voltage to cause equipment damageActive filter (APF) compensate 2-50th harmonic, STATCOM (SVG) compensate reactive power, three-phase current imbalance, as well as 13 times below harmonic. Green Power power quality products are controllable current source, it can generate any user specified current waveform, to achieve ideal compensation effects, and also improve the voltage quality indirectly by improving the current. Therefore, Green Power power quality products are comprehensive power management device to solve the problem of power quality.Working principle Through the external current transformer CT, the APF or STATCOM detect real-time grid current or load current, the controller extract the fundamental current, harmonic current through the fast Fourier transform, get active power, reactive power and negative sequence data by the DQ rotation coordinates, generate compensating current into power grid with same value opposite direction as compensating target (harmonic, reactive power, 3 phase imbalance) through IGBT power converter, realize power quality improvement.Advantages Modular structureStrong anti-pollution abilitySimple on-site installationNo limit combinationVery high power densityVery low lossLittle noiseVery high current loop bandwidthParameter comparison with other suppliersGP APF/SVGChina other APF/SVGMax. Power of one cabinet900A/600kvar600A/400kvarLoss<2.5%<3% ~ 4%Noise<60dB<70dBEquivalent switching frequency/current loop bandwidth80kHz/4kHz20kHz/1kHz