TCR-type SVC

Product introduction

The TCR (Thyristor Controlled Reactor) type SVC device is mainly composed of two parts: TCR (thyristor controlled reactor) and FC (filter capacitor bank).

The FC circuit also has a filtering function, which can provide a fixed capacitive reactive power, while the TCR circuit changes the inductive reactive power output by the phase-controlled reactor through the control thyristor.

As the dynamic response speed of the thyristor is very fast, whose response time is less than 10 milliseconds, the real-time dynamic compensation of reactive power can be realized. Especially for the load of three-phase AC arc furnace, the voltage fluctuation and flicker generated by it can be suppressed to a minimum. At the same time, the TCR type SVC has a split-phase adjustment function, which can balance the unbalanced load of the three-phase AC electric arc furnace and other loads, and suppress the negative sequence component of the power grid to a minimum.

Product features

◇ The microcomputer monitors the operating status of the TCR thyristor in real time, and provides timely alarm and protection to ensure reliable operation of the equipment;

◇ The control system generates the trigger pulse required by the thyristor switch according to the control strategy through the measurement, comparison, amplification, and phase shift trigger links. It controls the trigger angle, adjusts the current of the phase control reactor, and outputs the required inductive reactive power;

◇The whole control, protection and monitoring system has a strong anti-interference ability;

◇ The control is very flexible, which can realize multiple control methods such as three-phase simultaneous control, split-phase control and three-phase balance;

◇The device is equipped with remote operation and automation system interface function, which can realize unattended operation;

◇The high-pressure thyristor valve bank has strong over-pressure and over-current capability;

◇ The high-potential circuit board is air-insulated by self-energy extraction with BOD protection;

◇ The thyristor valve bank adopts the photoelectric conversion trigger method, to solve the problem of high and low voltage isolation problem, making the valve bank safe and reliable;

◇The phase-controlled reactor adopts dry-type air-core reactor, which is characterized by high linearity, low noise, low loss and good heat dissipation.

Application fields

① Long-distance power transmission

The power system is currently trending towards high-power, long-distance power transmission, which requires the transmission and distribution system to be more effective. Dynamic compensation can significantly improve the power transmission and distribution performance of the power system. Installing dynamic compensation at one or more appropriate locations on the power grid can achieve the following goals:

(1) Stabilizing the system voltage;

(2) Reducing power transmission loss;

(3) Increasing power transmission capacity;

(4) Buffering power oscillation;

(5) Improving the transient steady state limit.

② Coal mine

The hoist will have the following effects on the power grid during operation:

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

(2) Low power factor;

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

The dynamic compensation device can perfectly solve the above problems.

③ Wind farm booster station

The reactive power consumption of a wind farm changes with the change of wind speed. The dynamic reactive power compensation device can realize fast and dynamic adjustment of reactive power, stabilize the system voltage, improve the power factor, and completely solve the problem of reactive power reverse transmission in wind farms, which is an ideal choice to improve the power quality of the booster station of a wind farm.

④ Electric arc furnace

As a non-linear and irregular load connected to the power grid, the electric arc furnace will have a series of adverse effects on the power grid, the main ones are as follows :

(1) The generation of higher harmonics complicates the voltage distortion;

(2) Leading to serious three-phase imbalance in the power grid, resulting in negative sequence current;

(3) Causing serious voltage flicker;

(4) Low power factor.

⑤Rolling mill

The reactive impact load of the rolling mill will have the following effects on the power grid:

(1) Decreasing the power factor;

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

(3) Harmful higher harmonics will be generated in the load transmission device, which will cause serious distortion of the grid voltage. Dynamic compensation can perfectly solve the above problems, keeping the bus voltage stable. Without harmonic interference, the power factor is close to 1.0.

⑥ Electric 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. At present, the only way to solve this problem in the world is to install dynamic compensation systems at appropriate locations along the railway to improve the power factor.