What is the power factor correction?
Power factor correction (PFC) is a technique used to improve the power factor of an electrical system. Power factor is a measure of how effectively electrical power is being used. It is defined as the ratio of real power (measured in kilowatts, kW) used to perform work to the apparent power (measured in kilovolt-amperes, kVA) drawn from the power source.
Power factor correction aims to improve the power factor (PF) of an electrical system to bring it closer to unity (1). A power factor close to 1 means that the electrical power is being used efficiently, with minimal reactive power (VARs) circulating in the system.Poor power factor is usually caused by inductive loads such as motors, transformers, and fluorescent lighting, which cause the current to lag behind the voltage.
What are the methods of power factor correction?
Capacitor Banks: Capacitors are used to provide leading reactive power to counteract the lagging reactive power caused by inductive loads. Capacitor banks are a common and cost-effective solution for PFC in industrial and commercial settings.
Synchronous Condensers: These are over-excited synchronous motors that provide reactive power (similar to capacitors) and can be adjusted to match the reactive power needs of the system. They are typically used in larger, more complex power systems.
Static VAR Compensators (SVC): These are advanced systems that use power electronics to provide dynamic reactive power compensation. They can quickly respond to changes in load and improve power factor in real-time.
Active Power Factor Correction (APFC): These systems use power electronics to actively monitor and correct the power factor. APFC can be more efficient and precise compared to passive methods, as they can adapt to changing load conditions.
What is Static Var Generator?
Static Var Generator (SVG) is a type of advanced Power factor correction device that uses power electronics to provide dynamic and precise reactive power compensation. SVG are also known as Static Compensators (STATCOM).
How SVG Works?
What are the advantages of SVG?
What the difference of SVG against other PFC system?
Feature | Capacitor Banks | Synchronous Condensers | Static Var Generators (SVG) |
---|---|---|---|
Response Time Performance | Slow | Moderate | Fast (≤5ms) |
Compensation Precision Performance | Moderate | High | Very High |
Harmonic Filtering Performance | Limited | Limited | 2nd-25th odd order harmoincs |
Size Performance | Large | Very Large | Compact module design |
Cost Performance | Low to Moderate | High | High |
Maintenance Performance | Low | High | Low to Moderate |
Scalability Performance | Moderate | Difficult | Easy |
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