Low Voltage Static Var Generator SVG
✅Dynamic reactive power Compensation
✅Harmonic Filtering
✅Voltage Stability
✅Three phase Unbalance Correction
✅Flicker Mitigation
- Product Introduction
Low Voltage Static Var Generator (SVG/ASVG) is an advanced power electric device for dynamic reactive power compensation and power quality improvement. As cutting-edge reactive power equipment replacing conventional capacitor-reactor systems, it can allocate partial capacity for harmonic suppression.Built as a voltage-source converter with IGBT and PWM technology, it converts capacitor DC voltage into grid-synchronized three-phase AC voltage. The Q Series SVG (30kvar~150kvar) is developed and produced by Jinneng Electric Power Technology (Hubei) Co., Ltd. Available in 30kvar, 50kvar, 75kvar, 100kvar and 150kvar, it is widely used for power quality improvement in 400V power supply systems.
Working Principle
The heart of a Low Voltage Static Var Generator is a voltage-source converter. It adopts fully-controlled power electronic switching devices (such as IGBTs) and PWM (Pulse Width Modulation) technology to invert the DC voltage supported by the DC-link capacitor into three-phase AC voltage synchronized with the grid.
Under ideal pure reactive power operating conditions:
- When the system needs capacitive reactive power, the SVG outputs an AC voltage slightly higher than the grid voltage and generates a leading current, acting like an intelligent capacitor.
- When the system needs inductive reactive power, the SVG outputs an AC voltage slightly lower than the grid voltage and generates a lagging current, acting like an intelligent reactor.
By precisely controlling the amplitude (and phase) of its output voltage, the SVG can instantaneously, continuously and smoothly generate or absorb reactive power.
Technical parameter:
| Electrical Parameters (Q) of Low Voltage Static Var Generator | |
| Voltage Class | 400V AC |
| Input Voltage | 400V ±15% |
| (kvar) Capacity | 30kvar, 50kvar, 75kvar, 100kvar, and 150kvar |
| Frequency | 50Hz/60Hz |
| Qty of parallel installations | 8 Units |
| Active Power Losses | rated load<2.5% |
| Power grid standard | 3P/4W |
| Current transformer | 50/5-10,000/5 |
| Harmonic compensation(selectable) | 2nd ~ 13th harmonics |
| Allocatable compensation harmonic capacity(Optional) | 50% |
| Filter Capacity | THDi<5% rated load |
| Rapid Response Time | <55μs |
| Full Response Time | <20ms |
| Target PF | -1 ～ +1 settable |
| Noise Value | ＜65 dB(A) |
| Communication Interface | RS485,Ethernet Port |
| Communication Protocol | Modbus-RTU,TCP/IP |
| User interface(Optional) | 4.3 Inches LCD Touch Screen+LED indicators,7 Inches LCD Touch Screen |
| Installation | Wall Mounted/Rail Mounted |
| Color | Light grey, can be customized |
| CT Wiring | Supporting Utility Side/Load Side |
| Altitude | Altitude: ≤1500m; For 1500～4000m, capacity derates by 1% per additional 100 m |
| Operating Temperature | -10℃ ~+55℃ |
| Humidity | 5% ～ 95%,non-condensing |
| IP Class | IP20 |
| Standard | CE CQC |
Overall dimension:
Wall-mounted SVG
Designed for direct installation on walls.
Rack-mounted SVG
Installed in standard equipment racks or cabinets.
Installation parameter:
| 安装方式Installation mode | 机架式Rack type | 壁挂式wall-mounted | ||||||||||
| 尺寸Size(mm) | 20kvar | 35kvar | 50kvar | 75kvar | 100kvar | 150kvar | 30kvar | 35kvar | 50kvar | 75kvar | 100kvar | 150kvar |
| A | 380 | 480 | 480 | 480 | 480 | 480 | 380 | 480 | 480 | 480 | 480 | 480 |
| B | 400 | 570 | 570 | 570 | 570 | 570 | 400 | 570 | 570 | 570 | 570 | 570 |
| C | 88 | 175 | 175 | 175 | 175 | 175 | 88 | 175 | 175 | 175 | 175 | 175 |
| D | 465 | 522.6 | 522.6 | 522.6 | 522.6 | 522.6 | 465 | 550 | 550 | 550 | 550 | 550 |
| E | 456 | 637 | 637 | 637 | 643 | 643 | 456 | 599 | 599 | 599 | 605 | 605 |
| F | 430 | 501.5 | 501.5 | 501.5 | 501.5 | 501.5 | 430 | 520 | 520 | 520 | 520 | 520 |
| G | 12 | 101.6 | 101.6 | 101.6 | 101.6 | 101.6 | 12 | 300 | 300 | 300 | 300 | 300 |
| H | 32 | 38 | 38 | 38 | 38 | 38 | 32 | 175 | 175 | 175 | 175 | 175 |
| I | 89 | 161.5 | 161.5 | 161.5 | 140.5 | 140.5 | 89 | 140.5 | 140.5 | 140.5 | 140.5 | 140.5 |
| J | / | / | / | / | / | / | / | 178.2 | 178.2 | 178.2 | 178.2 | 178.2 |
| NW(kg) | 23 | 25 | 27 | 33 | 38 | 23 | 25 | 27 | 33 | 38 | ||
Note: The above dimensions are for reference only. We reserve the right to modify the datasheet. Please contact us for updated information.
SVG vs Smart Capacitor vs Traditional Capacitor Reactor
| Comparison Dimension | Low Voltage Static Var Generator (SVG) | Intelligent Capacitor | Traditional Capacitor-Reactor Compensation Bank |
|---|---|---|---|
| Core Technical Principle | Active compensation, based on IGBT + PWM voltage-source converter; actively generates/absorbs reactive power through power electronic devices | Passive compensation, centered on self-healing capacitors, with thyristor/magnetic latching relay for intelligent switching; essentially still capacitor-type compensation | Passive compensation, with contactors/fuses controlling grouped switching of capacitors and reactors; purely mechanical switch control |
| Reactive Power Regulation Mode | Stepless continuous smooth regulation, bidirectional output of capacitive/inductive reactive power, regulation range covers -100% ~ +100% rated capacity | Stepped regulation with fixed gears (e.g. 10/20/30kvar), only outputs capacitive reactive power | Large-step stepped regulation with few gears and large step size; only outputs capacitive reactive power, no inductive reactive power regulation |
| Response Speed | Extremely fast, total response time < 10ms, real-time tracking of load fluctuations | Medium, response time 20~100ms, limited by thyristor switching action | Slow, response time at the second level, limited by contactor mechanical action life and closing/opening time |
| Harmonic Mitigation Capability | Equipped with active filtering function; can allocate partial capacity to suppress system harmonics while compensating reactive power, and avoid harmonic amplification | Only suppresses transient harmonics generated by its own switching; cannot mitigate existing system harmonics, no improvement on 3rd/5th/7th harmonics | No harmonic mitigation capability; if parameters are mismatched, it easily resonates with system impedance and amplifies harmonic distortion |
| Regulation Accuracy | Extremely high, stepless regulation, can precisely control power factor above 0.99 | Medium, limited by switching gears, with fixed regulation step length, average power factor control accuracy | Low, large-gear switching easily causes over-compensation/under-compensation, large fluctuation range of power factor |
| Volume & Footprint | High integration, smallest volume under the same compensation capacity, compact cabinet structure, wall-mounted/cabinet-installable | Small single-module volume, but total footprint larger than SVG when multiple units are combined for compensation | Large volume, separate capacitor cabinet and reactor cabinet required, largest footprint, high requirements for on-site installation space |
| Maintenance Difficulty & Service Life | Extremely low maintenance, no mechanical contacts, long service life of IGBT devices, only regular heat dissipation cleaning required | Medium maintenance, thyristor switches have a certain action life, regular inspection of capacitor attenuation and switch status required | Frequent maintenance, contactor mechanical contacts are easy to burn out, fuses are easy to blow, regular replacement of wearing parts required, short overall service life |
| Initial Procurement Cost | High | Medium | Low |
| Applicable Scenarios | Scenarios with large load fluctuations, high harmonic content and strict power quality requirements: precision manufacturing, data centers, new energy charging piles, rail transit, medical buildings, etc. | Scenarios with relatively stable load, low harmonic content and general requirements for reactive power compensation accuracy: ordinary workshops, commercial buildings, small factories, etc. | Scenarios with long-term stable load, low power quality requirements and limited budget: old workshops, agricultural power distribution, non-civilian non-important buildings, etc. |
Supplementary Selection Notes:
- If your customer scenario has impact loads, harmonic distortion, and frequent load fluctuations, SVG is the recommended solution that can solve both reactive power and harmonic problems.
- Intelligent capacitor is essentially an "intelligent capacitor switching device", which cannot replace SVG's active compensation and harmonic mitigation capabilities.
- Traditional capacitor-reactor solutions are currently only used in low-budget projects in developing countries.
SVG Application scope:
Low Voltage Static Var Generator is widely used in many industries, mainly for improving the stability and power quality of power systems.
- In oil and coal mining, SVG can optimize the power factor of high-power equipment and reduce energy consumption.
- In new energy sectors such as wind and solar, SVG helps balance reactive power and ensure stable grid-connection.
- In data centers and industrial manufacturing, SVG can reduce voltage fluctuations and improve equipment efficiency.
- In commercial centers and public facilities, SVG helps cut electricity costs and improve power supply reliability.
FAQ
1. Can SVG handle both reactive power compensation and harmonic filtering at the same time?
- Yes. Our Q series SVG can allocate partial rated capacity for harmonic mitigation while performing reactive power compensation. The harmonic compensation capacity can be set up to 50% of the unit rating (optional).
2. What is the response time of your SVG?
- The full response time is less than 20 ms, and the rapid response time is less than 55 μs, which can quickly track fluctuating industrial loads.
3. What voltage level does your SVG support?
- Our Q series SVG is designed for 400V three-phase low-voltage distribution systems, with an input voltage tolerance of 400V ±15%.
4. What kvar capacities are available for your SVG?
- We provide 30kvar, 50kvar, 75kvar, 100kvar and 150kvar models. Multiple units can be connected in parallel, supporting up to 8 units in parallel.
5. Can SVG work with both 50Hz and 60Hz grids?
- Yes, our SVG supports both 50 Hz and 60 Hz power frequency.
6. What harmonic orders can the SVG suppress?
- The optional harmonic filtering function covers the 2nd ~ 13th harmonics..
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