Why is traditional capacitor compensation not fast enough? How does SVG static VAR generator achieve 5ms dynamic VAR regulation?

Voltage fluctuations often occur in power grids, causing equipment shutdowns or light flickering. The root cause is the instantaneous imbalance of reactive power. Traditional capacitors require mechanical switching actions, so they have a slow response speed and cannot compensate for the reactive power shortage caused by impact loads of equipment such as rolling mills and arc furnaces in real time. They may even aggravate voltage drops due to the slow response speed. The SVG series static VAR generator is a fully electronic power device based on IGBT conversion technology. It can automatically adjust the energy of the power grid at a speed of only 5ms, which is 20 times faster than traditional power capacitors. The following will explain what the SVG series static VAR generator is, what its key role is, and what advantages it has compared to ordinary capacitors.

What is SVG Series Static VAR Generator?

SVG series static VAR generator is an electronic device used to dynamically compensate reactive power in power systems. It can inject or absorb reactive current into the power grid in real time through its internal high-performance IGBT power module. The entire process is precisely controlled by a computer, and the response speed is only 5 milliseconds, which can instantly solve problems such as voltage flicker and production line shutdown that ordinary capacitors cannot handle. The compensation solution using a combination of capacitor banks and reactor banks can be directly replaced by SVG series static VAR generator, becoming the core device for dynamic voltage regulation in modern power grids.

What is the working principle of SVG Series Static VAR Generator?

The SVG series static VAR generator can detect the voltage and current in the power grid in real time, and the built-in high-performance chip can calculate the reactive power that needs to be compensated. Subsequently, the IGBT power module built into the device will instantly generate an adaptive current. When the power grid needs to supplement reactive power, it will immediately release a current similar to the characteristics of a power capacitor to the power grid. When there is excess reactive power in the power grid, it will quickly absorb current similar to the characteristics of a series reactor. The entire process is completed in only 5 milliseconds, quickly achieving a dynamic balance of reactive power.

What is the key role of SVG Series Static VAR Generator?

The core value of SVG series static VAR generator lies in maintaining the stable operation of the power system in real time. For example, the impact load of a rolling mill will produce a voltage fluctuation of ±10%. SVG can limit the fluctuation to a safe range of ±2% to ensure that the equipment will not shut down abnormally. At the same time, the power factor can be stably maintained above 0.99. Every increase of 0.01 in power factor can reduce line losses by 0.5%-1%, directly reducing electricity bills. For precision industries such as chip manufacturing, when the power grid experiences a 0.1 second voltage drop, SVG can quickly complete real-time compensation within 2 milliseconds to ensure the continuous operation of precision production lines. It is also suitable for new energy power stations, which can automatically adjust the reactive power of 200MW photovoltaic power stations, solve the problem of increased voltage at the grid connection point caused by reverse power generation, and ensure the continuous and complete operation of the power grid.

What advantages does SVG Series Static VAR Generator have over ordinary capacitors?

SVG series static VAR generator can achieve real-time and accurate reactive power compensation with a 5ms dynamic response capability, which is one hundred times faster than the 500ms response time of ordinary capacitors. It can control the ±10% voltage fluctuation caused by the impact load of the rolling mill to ±2%. Its stepless continuous regulation avoids the over-compensation/under-compensation problem caused by the switching of the capacitor bank, and the single-machine integrated bidirectional regulation capability eliminates the need for additional reactors. It can also stably maintain the power factor above 0.99. Every 0.01 increase in power factor can reduce line losses by 0.5%-1%. When responding to a 0.1 second voltage drop, it can complete full compensation within 2ms. Ordinary capacitors cannot achieve this effect at all. It completely solves the problem of reactive reverse transmission caused by the grid connection of new energy, reduces the overall risk of equipment downtime by more than 60%, and reduces grid losses by 15%.