TK-DWZT automatic voltage and reactive power regulation device

Product introduction

With the increasing shortage of energy resources, the power system is experiencing a power shortage. Improving the economic operation of the power system, and greatly reducing line losses have been highly valued by the national power system and the user. For a long time, there has been no effective reactive power adjustment method to adjust the power factor of the system in a timely manner, to ensuring the reactive power balance on the spot, and reducing the reactive current   and the heat loss.

TK-DWZT automatic voltage and reactive power regulation device can stabilize system voltage, regulate system power factor and effectively reduce power system loss. The device uses a voltage regulator to change the output voltage at the end of capacitor, thereby changing the reactive output capacity to adjust the system power factor. As there is no overvoltage for the device and no charging and discharging for the capacitor during regulation, the timely regulation can be realized, and the capacitor can always run below the rated voltage of the capacitor, ensuring the safe use of the capacitor and prolonging its service life. The capacitor is fixed and connected without grouping, and its output capacity can be continuously adjusted. There are two common capacity adjustment ranges, (100 ~ 25)% and (100 ~ 36)%, with nine stages of output.

Product features

① The device can ensure that the bus voltage and the power factor is within the qualified setting range, and ensure that the power factor is the best while the line loss is the smallest in accordance with the system voltage, reactive power parameters, nine bit diagram and fuzzy control principle;

② The capacitor of the device is fixedly connected, and the reactive power is not adjusted by switching the capacitor, but by changing the capacitor terminal voltage according to the formula Q=2πfCU2 to meet the requirements of system reactive power output;

③ There is no overvoltage in the regulation process of the voltage regulator, which can ensure the safety of the capacitor and prolong its service life;

④ Low voltage closing of capacitor can be adopted to effectively reduce the impact of capacitor closing inrush current on the system and capacitor itself;

⑤ Since the capacitor is always not separated from the power grid during voltage regulation and there is no charge and discharge phenomenon, there is no regulation delay, and timely regulation can be realized.

Application field

TK-DWZT voltage and reactive power automatic regulation device is widely used in 35 ~ 220kV substation and 6 ~ 35kV bus in the user's 10 ~ 110kV substation, mine hoist, wind farm booster station and electrified railway; It is used for automatic voltage and reactive power control to ensure voltage qualification rate, improve voltage quality, ensure power factor between 0.95 ~ 0.98, and effectively reduce line loss.

(1) Mine hoist

The hoist will cause the voltage drop and fluctuation of the power grid during operation, and will reduce the power factor of the power grid. The TK-DWZT automatic voltage and reactive power regulation device can solve the above problems.

(2) Wind farm booster station

In the wind farm booster station, if the method of switching capacitor banks in stages is used to compensate the system reactive power and improve the power factor, it cannot achieve rapid regulation with the change of wind speed, which is easy to reverse the reactive power to the system, while raising the bus voltage will endanger the stability of electrical equipment and the system. The TK-DWZT voltage and reactive power automatic regulation device can quickly adjust the voltage for reactive power compensation. While stabilizing the bus voltage and improving the power factor, it can completely solve the problem of reactive power reverse transmission. Installing the TK-DWZT voltage and reactive power automatic regulation device on the booster station of the wind farm can save costs, reduce the occupied area, and achieve the best results with the least investment. It is an ideal choice for improving the power quality of the booster station of the wind farm.

(3) Electric locomotive power supply

While the electric locomotive transportation method protects the environment, it also causes serious "pollution" to the power grid. The single-phase power supply of electric locomotives causes serious three-phase imbalance and low power factor in the power supply network, and generates negative sequence currents. At present, one of the ways to solve this problem in the world is to install TK-DWZT voltage and reactive power automatic regulation devices at appropriate locations along the railway to improve the power factor.

(4) Long distance power transmission

At present, the power system is tending towards high-power grid, long-distance transmission and high energy consumption. TK-DWZT voltage and reactive power automatic adjustment device performs grid reactive power compensation by means of voltage regulation, which can significantly improve the power transmission and distribution performance of the power system, that is, under different power grid conditions, in order to maintain a balanced voltage, the device is installed at one or more appropriate positions of the power grid to achieve the following purposes:

①Stabilize weak system voltage

②Reduce transmission loss

③Increase the transmission capacity to maximize the efficiency of the existing power grid

④Improve transient steady state limit

⑤Increase the damping under small disturbances

⑥ Buffer power oscillation

The installation of TK-DWZT voltage and reactive power automatic regulation device also provides a solid technical guarantee for the ongoing grid connection operation in China.