Container-type SVG

Product introduction

   SVG (Static Var Generator), also referred to as STATCOM (Static Synchronous Compensator), is a modern reactive power compensation device that uses self-commutated converter circuits. It is the latest technology in the field of reactive power compensation today. The SVG dynamic reactive power compensation device produced by our company has advantages in response speed, stable grid voltage, reduction of system loss, increase of transmission power, increase of transient voltage limit, reduction of harmonics and reduction of floor space.

     The research and production of our SVG is supported by our company’s powerful technical strength, and by making the best of the Group’s experience and advantages in the power industry, and by giving full play to the group company’s comprehensive research, design, production and test ability. Over the years, we have maintained a close academic connection and technical cooperation with many famous research institutions and electric companies both at home and abroad. Now we would like to make concerted effort with our users in improving the power quality of power grid by means of our advanced technology and superior products, contribute to the energy saving and consumption reduction and safe production of the electricity sector.

Product features

◇ Triggering and monitoring unit are designed separately and independently, with fast running speed and strong anti-interference ability;

◇ Reactive power detection technology based on instantaneous reactive power theory;

◇ DC side voltage balance control;

◇ Perfect protection function;

◇ Dedicated IGBT drive circuit ensuring the reliability of IGBT high-frequency switching; being capable of uploading the status monitoring information to the upper                      monitoring system in real time;

◇ The chain link is designed with self-derived energy and high reliability;

◇ The modular design of chain structure meets the requirements of high reliability of the system and is easy to maintain;

◇ The application of laminated copper bars meets the requirements of IGBT high-frequency triggering;

◇ The response time can reach 5ms.

◇ Being able to provide continuous, smooth, dynamic and fast reactive power compensation from inductive to capacitive;

◇ Being capable of solving the problem of load imbalance;

◇ Current source characteristics, the output reactive current is not affected by the bus voltage;

◇ Insensitive to system impedance parameters.

Application fields
① Wind power generation system

The uncertainty of wind resources and the operating characteristics of wind turbines make the output power of wind turbines fluctuate, resulting in unqualified grid-connected power factor, voltage deviation, voltage fluctuation and flicker. For large-capacity wind farms connected to the system, there are still stability problems at times, the dynamic reactive power compensation systems are thus needed; on the other hand, fluctuations in system voltage will also affect the normal operation of the wind turbine. The application of SVG dynamic reactive power compensation devices in wind farms can not only meet the power factor, voltage fluctuation and flicker requirements of the wind power access system, but also reduce the impact of system disturbances on the wind turbines.
② Coal mine hoists and other heavy industrial loads

        Coal mine hoists and other heavy industrial loads will have the following effects on the power grid during operation:

　　(1) Causing the voltage drop and fluctuation of the power grid;

　　(2) Low power factor;

　　(3) The transmission device will generate harmful higher harmonics.

The installation of SVG dynamic reactive power compensation device can perfectly solve the above problems.
③ Electric arc furnace

        The electric arc furnace is connected to the power grid as a nonlinear load, which will have a series of adverse effects on the power grid. The main ones are as follows:

　　(1) The power grid has caused serious three-phase imbalance and negative sequence current;

　    (2) The higher harmonics are generated, among which there is a common situation that the 2nd and the 4th even harmonics coexist with the 3rd, 5th, 7th and other odd harmonics, which further complicates the voltage distortion changes;

　　(3) Causing serious voltage flicker;

　    (4) Resulting in low power factor.

        The use of SVG dynamic reactive power compensation device can solve the above problems, quickly compensate and stabilize the bus voltage, improve productivity, and minimize voltage fluctuations and flicker. The split-phase compensation function can eliminate the three-phase imbalance caused by the electric arc furnace.
④ Rolling mill
        The reactive power impact generated by the rolling mill will have the following impacts on the power grid:

　　(1) Causing voltage fluctuations in the power grid, and in severe cases, making electrical equipment unable to work normally, reducing production efficiency;

　　(2) Power factor reduction;

　　(3) Harmful higher harmonics will be generated in the load transmission device, which will cause serious distortion of the grid voltage. 
        The installation of SVG dynamic reactive power compensation device can perfectly solve the above problems, stabilize bus voltage, eliminate harmonic interference, and improve power factor.
⑤ Power system substation (66/110kV)
        The SVG dynamic reactive power compensation device can quickly and accurately perform capacitive and inductive reactive power compensation. While stabilizing the bus voltage and improving the power factor, it completely and conveniently solves the problem of reactive power reverse transmission. When installing a new SVG device, you can make full use of the original fixed capacitor bank and thyristor phase-controlled reactor (TCR) part to achieve the best results with the least investment, which is the most effective way to improve the quality of regional power supply.

⑥ Long-distance power transmission
     The installation of SVG dynamic reactive power compensation devices on high-voltage, high-power and long-distance power transmission lines can significantly improve the power transmission and distribution performance of the power system, for which the SVG device functions as follows:

　　 (1) Stabilizing weak system voltage;

　　 (2) Reducing transmission loss;

　　 (3) Increasing the transmission capacity to maximize the efficiency of the existing power grid;

　　 (4) Increasing transient steady state limit;

　　 (5) Increasing damping under small disturbances;

　　 (6) Enhancing voltage control and stability;

　　 (7) Buffering power oscillation.
⑦Electric locomotive power supply

      Although the electric locomotive transportation can protect the environment, it also can cause serious “pollution” to the power grid. This single-phase load causes serious three-phase unbalance and low power factor of the power grid, and generates negative sequence current. The installation of SVG dynamic reactive power compensation devices at appropriate locations along the railway can balance the three-phase power grid and improve the power factor through the split-phase fast compensation function.