The Static Var Generator (SVG) is an advanced reactive power compensation device based on power electronics technology. It realizes fast and continuous adjustment of reactive power through fully controlled power electronic devices (such as IGBTs). Compared with traditional reactive power compensation equipment (such as capacitors, reactors, SVC, etc.), it has significant technical advantages and is widely used in power systems and industrial fields.
Extremely fast response speed and excellent dynamic compensation performance
The response time of traditional reactive power compensation devices (such as SVC) is usually tens to hundreds of milliseconds, while the response time of SVG can be shortened to 5-20 milliseconds. It can quickly track reactive power changes of the power grid or loads (such as fluctuations of impact loads and harmonic sources), suppress voltage fluctuations and flickers in real time, and improve power grid stability.
Wide range of reactive power adjustment and bidirectional compensation
SVG can both generate inductive reactive power (capacitive compensation) and absorb inductive reactive power (inductive compensation). The compensation range covers -100% to +100% (from full capacitive to full inductive), and the output reactive power can be continuously and smoothly adjusted, avoiding the problems of reactive power step and over-compensation/under-compensation caused by traditional capacitor grouping switching.
Strong harmonic control capability and improved power quality
While compensating reactive power, SVG can suppress or eliminate harmonic currents in the power grid (mainly 3rd, 5th, 7th and other characteristic harmonics) through specific control algorithms (such as harmonic detection based on instantaneous reactive power theory). It is especially suitable for scenarios with non-linear loads (such as frequency converters, arc furnaces, rectifiers), reducing the interference of harmonics on equipment and the power grid.
Small footprint and flexible installation
SVG adopts an all-power electronic structure, without bulky components such as large-capacity reactors and capacitor banks. Under the same compensation capacity, its footprint is only 1/3-1/5 of that of traditional SVC. Moreover, it can be designed modularly, facilitating decentralized installation or integration into switch cabinets, and is especially suitable for space-constrained scenarios (such as urban distribution networks, factory workshops).
Adaptability to harsh power grid environments and high reliability
SVG has stronger tolerance to power grid voltage fluctuations, and can still work normally even when the power grid voltage drops (such as a sudden voltage drop of 20%-30%). At the same time, it adopts a multi-level topology and redundant design, which can effectively avoid the shutdown of the entire set of equipment caused by a single device failure, and its operational reliability is significantly higher than that of traditional compensation devices.
Reduction of line loss and improvement of power grid utilization
Through accurate reactive power compensation, SVG can reduce the reactive current of transmission lines and reduce line loss (line loss is proportional to the square of current). At the same time, it improves the power factor of the power grid (which can be stably maintained above 0.95), avoids electricity fee fines caused by low power factors, and improves the utilization rate of transformers, lines and other equipment.
Power system distribution network
Urban distribution network: Compensate for reactive power fluctuations of residential and commercial loads, suppress voltage flickers (such as the start and stop of air conditioners, elevators and other equipment), and improve the voltage quality at the end of the distribution network.
Rural power grid transformation: Solve the problem of reactive power shortage in rural power grids due to long lines and scattered loads, improve the power supply stability in remote areas, and reduce line loss.
Industrial field
Heavy industry loads: For impact loads such as arc furnaces (steelmaking), rolling mills, and electric welders, SVG can quickly compensate for their reactive power impact and harmonics, avoiding the impact of power grid voltage fluctuations on production accuracy.
Manufacturing factories: Workshops with a large number of frequency converters, servo motors, and rectifiers (such as automobile factories, electronics factories), SVG can compensate for reactive power and harmonics at the same time, protecting precision equipment from interference.
New energy access: The output power of photovoltaic power plants and wind farms is fluctuating. SVG can compensate for their reactive power deviations, maintain the stability of the grid-connected point voltage, and meet the grid connection standards (such as GB/T 19964, GB/T 19963).
Rail transit
The traction converters of subways and high-speed railways generate a lot of harmonics and reactive power. SVG can be installed in traction substations to suppress harmonics from feeding back to the public grid, and at the same time compensate for reactive power to improve the voltage quality of the traction network, avoiding voltage drops when trains start.
Data centers and commercial buildings
Equipment such as data center servers and UPS power supplies have non-linear reactive power. SVG can improve the power factor, reduce the load on transformers and lines, and reduce the interference of harmonics on precision electronic equipment, ensuring the stable operation of data centers.
Mines and oil fields
Equipment loads such as crushers and hoists in mines, and oil pumps in oil fields have large fluctuations. SVG can quickly respond to reactive power changes, avoid equipment shutdown caused by power grid voltage fluctuations, and improve production efficiency.
