Static Var Generator (SVG)
The basic principle of SVG is that the voltage source inverter is connected to the grid in parallel through the reactor. As the voltage source inverter, it consists of 2 parts are DC capacitance and inverter bridge. Then, the inverter bridge is composed of a semi-conductor device (IGBT) which can be turned off. By adjusting the IGBT device’s switcher in inverter bridge, the SVG can control the voltage, amplitude, and phases after the inverter DC current to AC current. So, the device is equivalent to a phase-modulated power supply. As detecting the required reactive power in the system, the SVG can quickly generate the equal and opposite reactive power to achieve balance and system running with high power factor in real time.
- Power grid frequency:50/60Hz
- Response time:1 ~ 10 ms
- Filtering range:2 ~ 13 times all or selected times
- Operating temperature:-10℃ ~ 40℃
Description
A High Static Var Generator (SVG) is a device used in electrical power systems to control and regulate voltage. Var stands for volt-ampere reactive, which is a unit of measurement for reactive power. Reactive power is essential in alternating current (AC) systems for maintaining voltage levels and supporting the operation of inductive loads, such as motors. The SVG is a type of static compensator that can rapidly and dynamically adjust its reactive power output to help stabilize the voltage on the power grid.
Operating Principle
The High Voltage Static Var Generator (SVG) operates on the principle of utilizing a voltage source inverter connected in parallel to the grid through a reactor. This inverter consists of two main components: a DC capacitance and an inverter bridge. The inverter bridge further comprises semiconductor devices, typically Insulated Gate Bipolar Transistors (IGBTs), which can be switched on or off.
Through precise control of the IGBTs in the inverter bridge, the SVG can manipulate the voltage, amplitude, and phases of the AC current generated from the DC current. Essentially, the SVG functions as a phase-modulated power supply. By detecting the required reactive power in the system, the SVG rapidly generates reactive power of equal magnitude but opposite phase, ensuring a real-time balance and enabling the system to operate with a high power factor.
Waveform and phasor diagrams | Illustration | |
No load running | UI = Us, IL = 0, SVG –No absorb reactive power nor emitting reactive power | |
Capacitive | UI > Us, IL is an advanced current whose amplitude can be continuously controlled by adjusting the UI, thereby continuously adjusting the reactive power emitted by SVG | |
Inductive operation | UI < Us, IL
Is the lagging current. At this time The reactive power absorbed by SVG can be continuously controlled |
Advantages and Characteristics:
- The SVG exhibits adaptability to three operational modes: capacitive, inductive, and no-load modes.
- Capable of swiftly and dynamically compensating reactive power, the SVG can transfer both capacitive and inductive fundamental currents as needed.
- It achieves the crucial function of three-phase balanced load by compensating the corresponding load current.
- Providing benefits to customers, the SVG dampens power grid resonance, stabilizes power grid voltage, improves power factor, and prevents harmonic amplification.
- The SVG can seamlessly connect with power grids operating at 6kV, 10kV, 20kV, and 35kV.
- With a rapid response time ranging from 1 to 10 microseconds (㎳), the SVG ensures swift adjustments to changing power system conditions.
- Robust protections are in place, including measures against over-current, rapid breaks, over-voltage, under-voltage, and lightning strikes.
- Remote monitoring capabilities are facilitated through multiple communication protocols, including RS 485, CAN, Modbus, TCP/IP, and GPRS.
Technical Data
Available into the Power grid voltage: 6kV/10kV/20kV/35kV
Power grid frequency: 50/60Hz
Wire method (input): Top, bottom, or custom
Filtering range: 2 ~ 13 times all or selected times
Response time: 1 ~ 10 ms
Protection function: over-current, rapid outage, over-voltage, lower-voltage, lightning protection
Remote monitoring: RS485, CAN, Modbus, TCP/IP, GPRS
Operating temperature: -10℃ ~ 40℃
Model No. | Rated voltage (kV) | Compensation capacity (Mvar) | Compensation current (A) | Screen cabinet size (mm) |
W-SVG-6/2.4 | 6 | 1.2±1.2 | 230 | 4500*1200*2400 |
W-SVG-6/4.8 | 6 | 2.4±2.4 | 460 | 4800*1200*2400 |
W-SVG-6/8.0 | 6 | 4.0±4.0 | 768 | 6000*1200*2400 |
W-SVG-6/10.0 | 6 | 5.0±5.0 | 960 | 7800*1200*2600 |
W-SVG-10/2.0 | 10 | 1.0±1.0 | 116 | 6000*1200*2400 |
W-SVG-10/4.0 | 10 | 2.0±2.0 | 230 | 6000*1200*2400 |
W-SVG-10/8.0 | 10 | 4.0±4.0 | 460 | 7500*1200*2400 |
W-SVG-10/10 | 10 | 5.0±5.5 | 576 | 7500*1200*2400 |
W-SVG-35/16 | 35 | 8.0±8.0 | 264 | 4600*25000 |
W-SVG-35/32 | 35 | 16±16 | 528 | 4600*30000 |
W-SVG-35/60 | 35 | 30±30 | 1000 | 5600*36000 |
W-SVG-35/80 | 35 | 40±40 | 1336 | 8000*18000 |
Application
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