In Energy Transition: Wind Power Challenges and SVG's Emergence
In the wave of global energy transformation, wind power, as an important force of clean energy, is gradually becoming one of the core sources of global electricity demand. However, wind power is greatly affected by wind speed, with problems such as unstable active power output, the need to absorb reactive power from the power grid, and the generation of harmonics, all of which pose challenges to the stable operation of the power grid. The emergence of Static Var Generator (SVG) has provided a strong guarantee for the stable operation of wind farms.
Working Principle and Structural Composition of SVG
SVG, namely Static Var Generator, has a core working principle that is to connect to the power grid in parallel through a self-commutated bridge circuit and a reactor. By adjusting the phase and amplitude of the output voltage on the AC side of the circuit or directly controlling the AC side current, it realizes the dynamic compensation of reactive power. Structurally, SVG mainly has two types: voltage-source and current-source bridge circuits. At present, due to the advantage of operating efficiency, voltage-source bridge circuits are more widely used. In wind farms, SVG is composed of power units, reactors, and control systems. Its power switching devices adopt IGBT with self-turn-off capability, which can precisely control the voltage, convert the DC side voltage into AC voltage with the same frequency as the power grid, connect to the bus through the reactor, quickly compensate the reactive power required by the power grid, and ensure the efficient operation of the power supply system.
Distinct Advantages of SVG Over Traditional Equipment
Compared with traditional reactive power compensation equipment, SVG has many significant advantages. It has an extremely fast response speed, with the compensation response time controlled within 10ms, far exceeding the level of 20-40ms of traditional equipment. It can excellently deal with impact loads and effectively suppress voltage flicker. Moreover, SVG not only does not generate harmonics itself but also can well filter out harmonics in the power grid, without the need for additional filtering devices, reducing equipment maintenance costs. At the same time, SVG has strong stability, is less affected by bus voltage fluctuations, and will not resonate with the power grid impedance. Even if the current of the compensation object is large, it can generate controllable compensation current, and can also adjust with the change of power grid frequency to ensure a stable compensation effect.
Standardized Operation Procedures for SVG
In the daily operation of SVG, standardized start-up and shutdown procedures are crucial. During start-up, it is necessary to first check the equipment and the surrounding environment to ensure no foreign objects and tight connecting bolts, then operate the relevant switches step by step, and finally start the equipment after power transmission. During shutdown, the equipment should be stopped through the control software first, then the relevant switches should be disconnected in sequence, and the software and industrial computer should be shut down.
Maintenance and Protection Measures for SVG in Complex Environments
For wind farms, the operating environment is often complex. For example, coastal desert areas face problems such as heavy sand and dust, severe salt spray corrosion, large temperature differences between day and night, and easy condensation, which will have adverse effects on the operation of SVG. Therefore, targeted measures should be taken in equipment selection and maintenance. When selecting equipment materials, insulation requirements should be strengthened, creepage distance should be increased, and salt spray resistant materials should be used; the cables in the cabinet should be placed overhead through insulation, and the optical fibers should be wrapped with copper foil and then grounded; drainage ports should be added in the equipment grooves, dehumidifiers should be configured, and the power of cooling fans should be increased, while strengthening the frequency of equipment maintenance; regularly derust, fasten and rust-proof the equipment, and replace aging parts promptly; if conditions permit, the equipment can be sealed or converted to water cooling to reduce contact with the external harsh environment.
SVG Empowers Wind Power Industry and Promotes Sustainable Energy Development
As a key equipment for the stable operation of wind farms, SVG, with its efficient reactive power compensation capability, escorts the development of the wind power industry. In the future, with the continuous development of the wind power industry, SVG will also play a more important role under the promotion of technological innovation, contributing to global energy transformation and sustainable development.
Capacitor, Reactor, Static Var Generator, and Active Power Filter Supply
Hengrong Electric Co., Ltd.