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Distinctive functions and advantages of SVG solution
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Power quality
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2018/08/02 17:41
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Product description
Technical parameters
Distinctive functions and advantages of SVG solution
SVG is one of the core devices and core technologies of the flexible AC transmission system (FACTS). It is used to perform reactive and harmonic compensation in the power system. SVG is connected in parallel to the power grid, which is equivalent to a variable reactive current source. Its reactive current can quickly change with load reactive power and harmonic current, and automatically compensate the reactive and harmonic currents required by the system. The main functions of INPSVG are as follows: l Improve line transmission stability l Maintain the receiving end voltage, enhance system voltage stability l Compensate reactive power of the system, improve power factor l Harmonic dynamic compensation, improve power quality l Suppress voltage flicker and fluctuation l Suppress three-phase imbalance Instead of using large-capacity capacitors and inductors, INPSVG uses high-frequency switch of high-power electronic devices to achieve conversion of reactive power. Compared with conventional compensation solutions, it has the following advantages: l Faster response time l More effective suppression of voltage flicker l Wide operating range, large compensation capacity l Flexible compensation methods, including reactive power compensation, voltage compensation, negative sequence compensation, harmonic compensation and comprehensive compensation l No harmonics occur when providing reactive power l Output harmonics lower than 13th harmonic when compensating harmonics

Typical usage occasion of SVG






Problems caused by reactive power and harmonics Reactive power problem The existence of resistive and inductive loads in power systems, such as asynchronous motors, transformers, fluorescent lamps, etc., consumes a large amount of reactive power, while large-capacity impact reactive load can cause rapid fluctuations in system voltage. Power electronic converter devices, especially popularization of various phase-controlled rectifiers, also consume a large amount of reactive power. This leads to various problems such as deterioration of power quality, increase in transmission loss, three-phase imbalance, and reduction of effective utilization of power transmission and transformation equipment. Conventional reactive power compensation device generally adopts contactor or thyristor switching control, which features slow response speed, fixed switching compensation capacity, large floor space and complex maintenance. The new dynamic var generator can overcome these shortcomings, effectively stabilize the voltage of the power grid, improve the power quality and reduce the reactive power loss. Harmonic problem The widespread application of non-linear loads such as rectifiers and converters in the system will generate a large amount of harmonic currents into the grid, causing grid voltage distortion. Harmonics will not only cause eddy current losses in power equipment and lines and increase line losses, but also will induce system resonance, resulting in harmonic overvoltage and equipment damage. Large amount of harmonics can also cause failure of relay protection and automatic control systems, affecting normal production activities. Conventional filters mostly use capacitor and series reactors to form low impedance characteristic at characteristic frequency, to absorb harmonic currents. Due to the passive absorption method, the equipment is susceptible to system impedance, which may cause system resonance, overload and other hazards; the floor space is large, and the electromagnetic components have interference to the environment. On the contrary, SVG adopts active output mode, which is not affected by system impedance, has no danger of overload, and has small floor space. It can effectively offset harmonic currents in the power grid, improve power quality and reduce harmonic losses.
Operating principle of SVG The principle of INPSVG (Static Var Generator) is to connect the VSC (Voltage Sourced Converter) to the grid in parallel via reactor or transformer, and adjust the output voltage magnitude of the AC side of the inverter, so as to change the reactive current magnitude of the input system, quickly absorb or emit reactive power, thus realizing rapid regulation of reactive power.


Technical features of SVG
Angular topology

Star topology

Product features l Full digital control system, fast response speed. The step response speed is less than 5ms; l Intelligent fuzzy control strategy, optimized control algorithm, improved compensation accuracy, and power factor can be controlled to 1; l Low power design, equipment loss is less than 3% at full load; l Modular design, convenient maintenance of equipment, power module replacement time is less than 5 minutes on average; l Flexible compensation method, equipped with multiple compensation functions and automatic optimization function; l The complete machine is fully loaded and aging for 24 hours before delivery.
Input | Control | |||
Grid voltage | Single-phase / three-phase, 50Hz/60Hz | Control mode | Instantaneous current detection technology, PWM current tracking control technology, decoupling control technology, DC side voltage balance control technology | |
Allowable operating voltage | <120% busbar voltage | Control chip | Digital signal processor (DSP) field programmable gate array FPGA | |
Compensation performance | Auxiliary function | Full digital microcomputer control, real-time communication, self-diagnosis function | ||
Power factor | >0.95 (within the compensation capacity range) | Control function | Voltage compensation, reactive power compensation, harmonic compensation, negative sequence compensation, comprehensive compensation | |
Harmonic | Meet the requirements of Quality of electric energy supplyHarmonics in public supply network GB/T14549-93 | Control power supply | Main 380VAC Auxiliary 220VDC | |
System response | ≤5ms | Communication | Modbus/Profibus | |
Reliability and service life | The design service life is 20 years, mean time between failures MTBF>75000 hours, mean time to repair MTTR<5 minutes | Industrial control machine display | Grid current, grid voltage, load current, SVG current, active power, reactive power, voltage and current THD, power Factor, etc. | |
Others | Environment | |||
Protection function | System protection: overvoltage, undervoltage, overcurrent, short circuit, loss of synchronization, phase loss, negative sequence fault, communication fault, etc. Unit protection: overvoltage, undervoltage, overheat, short circuit, overcurrent, fiber fault, etc. | Operation place | Indoor, no explosive or corrosive gases | |
System structure | Integrated design, modular design, transportation as whole, ready-to-use | Ambient temperature | 10-40 | |
High voltage isolation | Optical fiber signal transmission | Ambient humidity | 90%, no condensation | |
Power semiconductor | IGBT | Altitude | Below 1000 meters (customized if above 1000 meters) | |
Cooling method | Air/water cooling | Storage/transport temperature | 40-70 | |
Protection level | IP20 (customized if any special requirement) |
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