Power quality is a critical concern in the field of electrical engineering. A stable and reliable electricity supply is essential for daily life and the efficient operation of various industries.
One of the common challenges faced by electrical systems is the presence of harmonics. These harmonics can lead to several issues, including increased energy costs, equipment damage, and reduced efficiency of power systems.
Numerous technologies and solutions have been developed to address these challenges. Among them, the Static Var Generator (SVG) stands out as a key solution in the industry.
An electrical system’s harmonic distortion is reduced and power factors are managed by a static variable rate generator.
The operating principle of the Static Var Generator (SVG) is similar to an Active Power Filter. When the load generates inductive or capacitive currents, it causes the load current to either lag or lead the voltage. The SVG detects the phase angle difference and injects leading or lagging current into the grid, aligning the current phase angle with the voltage on the transformer side. This results in a near-unity fundamental power factor.
YT-Electric's Power Factor Correction series SVG also can correct load imbalances and partially compensate for harmonic currents.
Before explaining the working principles of a Static Var Generator (SVG), it is important to understand the power factor and its significance. Power factor correction is the process of improving the efficiency of an electrical system by increasing its power factor. Ideally, a power factor of 1 means the system is operating at peak efficiency, with all the supplied power being used productively. However, when the power factor is less than 1, it indicates that some power is being wasted due to inefficiencies caused by inductive or capacitive loads.
In many industrial and commercial settings, equipment such as motors, transformers, and fluorescent lights create inductive loads, which cause the power factor to lag (fall below 1). This lagging power factor generates reactive power—power that doesn’t perform any useful work but still must be supplied by the utility. As a result, this inefficiency increases energy costs and reduces the overall performance of the electrical system.
YT Electric's Static Var Generator (SVG) represents an innovative approach to power factor correction, utilizing fully controlled technology to enhance system performance. The SVG is 100% imbalance full compensation, improves Power Factor (PF) to -1(Capacitive)/1(inductive), and balances all three phases, creating an efficient and optimized power system.
The SVG's core is a high-power voltage inverter, which rapidly absorbs or delivers reactive power by adjusting the amplitude and phase of the inverter's output voltage, or by directly controlling the AC-side current. This enables swift and dynamic compensation of reactive power.
With a response speed of under 5 milliseconds, the SVG effectively suppresses voltage fluctuations and flicker. Its quick response time ensures optimal compensation for any voltage instability, providing superior performance in managing fluctuations.
The SVG functions as a current source, and its output capacity remains largely unaffected by bus voltage changes. Even under reduced system voltage, the SVG can maintain its rated reactive current output and possesses strong overload handling capabilities.
SVG systems do not require external filter banks or the presence of resonance amplification, thanks to their use of insulated-gate bipolar transistor (IGBT) technology. This prevents resonance issues and significantly enhances the safety and reliability of operations.
Manufacturing environments often operate with various non-linear loads such as variable frequency drives, welders, and CNC machines. These types of equipment are known for generating harmonics, which can cause power quality issues. To address this, active harmonic filters stabilize power quality, reduce equipment downtime, and enhance energy efficiency.
Data centers are highly sensitive to any power quality disturbances, as disruptions in power supply can result in data loss and system failures. Active harmonic filters are employed to protect against voltage distortion, ensuring the continuous operation of critical IT infrastructure.
In commercial buildings, numerous electrical loads, including lighting, HVAC systems, and elevators, can contribute to power quality problems. Active harmonic filters help maintain stable power quality, reduce energy consumption, and safeguard the building’s electrical systems.
As renewable energy sources such as solar and wind power become more widespread, active harmonic filters play a crucial role in ensuring the quality of the electricity generated and supplied to the grid. They help regulate the output of these intermittent energy sources, making them more reliable and efficient.
Large industrial plants with diverse machinery and processes, often face significant power quality challenges. Active harmonic filters manage power factors and mitigate harmonic distortion, improving overall efficiency and protecting equipment from potential damage.
YT Electric is the leading and the biggest manufacturer of ODM and OEM power-quality products in China. We specialize in low-voltage Active Harmonic Filters (AHF) and Static Var Generators (SVG).
All products are certified with ISO9001, CE, and CQC standards, and are supported by type test reports.
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