Static var generator SVG
SVG is a typical power electronic equipment, which consists of three basic functional modules: Detection module, control operation module and compensation output module. Its working principle is to detect the current information of the system by external
SVG is a typical power electronic equipment, which consists of three basic functional modules: Detection module, control operation module and compensation output module. Its working principle is to detect the current information of the system by external CT, and then analyze the current information, such as PF, S, Q, etc. through the control chip. Then the compensating driving signal is given by the controller, and the compensating current is sent out by the inverting circuit composed of the power electronic inverting circuit. The most advanced SVG product in the world is STATCOMG - static reactive power compensation device.
SVG Static Var Generator uses IGBT to form a self-commutating bridge circuit, which is connected in parallel to the power grid through reactors. The amplitude and phase of the output voltage on the AC side of the bridge circuit can be appropriately adjusted, or the AC side current of the bridge circuit can be directly controlled. Quickly absorb or send out the required reactive power to achieve the purpose of fast dynamic regulation of reactive power. As an active compensation device, it can track not only the impulse current of impulse load, but also the harmonic current.
2.1 Working Principle of Traditional Capacitor Reactance Compensation
2.2 Principle of SVG Compensation
1.Dynamic Compensation of Reactive Power and Improvement of Power Factor
When the power grid is inductive, SVG generates capacitive current to counteract the opposite reactive current and ensure that the power factor of the system is more than 0.99
When the power grid is capacitive, SVG generates inductive current to counteract the opposite reactive current.
2. It not only does not produce harmonics, but also compensates harmonics dynamically while compensating reactive power.
3. The response speed is fast, the stepless compensation is realized completely, and the dynamic load compensation is completed within 10ms.
4. The superior " software electronic dog" circuit and fault-tolerant technology can automatically find the program running errors and instantly reset the computer, completely eliminating the " crash" phenomenon.
5. Unique " hardware circuit fault protection circuit" ensures that any circuit in the controller will not cause output misoperation immediately after being damaged or " crashed".
6. Full digital control, real-time detection and calculation of reactive power.
7. The control circuit is simple, reliable, powerful, easy to expand, debug and maintain.
8. The controller has a good man-machine interface, intelligent judgment, optimal control, fast response, full digital liquid crystal display, networking communication function, and can view time, operation mode, voltage, current, power factor, active power, reactive power, fault information, etc.
9. Complete protection measures (over-voltage, under-voltage, short circuit, over-current, etc.) with high degree of automation.
10. Reasonable structure design and convenient use.
11. Improving Static and Dynamic Stability of Power System.
12. Reducing the unbalance of voltage and current, improving the quality of power grid, stabilizing system voltage and restraining voltage flicker.
13. Reduce power loss, save energy efficiently, improve the efficiency of electrical equipment and increase the load capacity of transformer.
14. The device has built-in self-discharge components. After the device is disconnected from the power grid, the residual voltage can be reduced to less than 50 volts in 5 seconds.
15. Take voltage, power factor and reactive power demand as control objectives, and control voltage within a set range.
16. RS232 communication interface, which can communicate with computer and other equipment.
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