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...
1. 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.
2. 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 occupied
The 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.
3. Customer benefit of improving power quality using STATCOM
Reactive power compensation
Reduce user's electricity bills
Ensure the power factor reaches national standard, to avoid government fine because of low power factor
Reduce line loss, reduce voltage drop
Increase the actual usage capacity of transformer and generator
3 phase imbalance compensation of the STATCOM
Avoid the neutral line overheat and aging, and even the risk of fire
Avoid partial voltage imbalance, causing the device false alarm
Avoid high zero ground voltage causing the burnt risk of control system weak electricity facilities
Voltage deviation control
Avoid too high or too low voltage to cause equipment damage
Active 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.
4. Working principle of the STATCOM
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.
5. Advantages of the STATCOM
Strong anti-pollution ability
Simple on-site installation
No limit combination
Very high power density
Very low loss
Very high current loop bandwidth
6. Parameter comparison with other suppliers of the STATCOM
China other APF/SVG
Max. Power of one cabinet
<3% ~ 4%
Equivalent switching frequency/current loop bandwidth
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