Project application background
Supply and distribution system in order to enhance the role of the power factor and reduce the loss of power transformers and transmission lines, improve power supply efficiency, improve power supply environment, reactive power compensation device in a very indispensable in the power supply systems important position. Reasonable choice compensation device, can be done to minimize the loss of the network, so that the grid quality.
        Widespread distribution system wide frequency range of harmonic pollution, reactive compensation capacitor impedance characteristics presented in the grid and the grid frequency dependent, therefore, on the occasion of harmonic pollution directly using pure capacitive reactive power compensation is easy to cause a variety of electrical Problem: lead capacitor overload, fever, shorten life; cause grid resonance, resulting in an electrical accident; capacitors cause harmonic amplification, increased harmonic pollution, power factor can not reach the target.
By a non-tuner reactor and filter capacitor in series dedicated to compensate the non-tuning filtering scheme. By concatenating anharmonic reactor, the tuning frequency anharmonic compensation filter circuit is lower than the lowest frequency present in the system voltage or main harmonics of harmonic currents. No longer formed between the impedance of the system and the non-tuned resonant circuit conditions within the range of the system harmonic voltages and currents, neither produce series resonance, it does not produce a parallel resonance.
        Such as: CCTV new site project, low voltage reactive power compensation using RCT series three-phase non-tuned filter unit compensation scheme, a total compensation capacity Kvar; NPC office projects, low voltage reactive power compensation using RCT series three-phase non-tunable filter unit compensation scheme total compensation capacity Kvar; Guangzhou Asian Games project, the use of low-voltage reactive power compensation RCT series three-phase non-tunable filter unit compensation scheme, a total compensation capacity Kvar;
Configuration and implementation plan
1, to determine the demand for reactive power compensation
   Reactive power required according to the known power factor is calculated to achieve the target power factor.
2, to determine compensation
   Low voltage reactive power compensation compensation compensation, depending on the location of the system can be divided into: Group concentrated compensation, local compensation
    1) focus groups Compensation: install in the first end of the line (such as transformers main line side), all under a load line for compensation
    2) Local Compensation: Install a single piece of equipment into the line-side for a single large volume overload or a single production line
3, to determine the control mode
   Reactive power compensation demand conditions combined to determine the control mode. Commonly used control methods are: fixed switching control, automatic switching control.
4, to determine the compensation of non-tuned filter type
   Harmonic pollution characteristics for the system, choose a different reactance ratio of non-compensation filter tuning program.
   Distribution system complex and diverse, non-compensation filter tuning program design should be more flexibility in the use of basic design steps, combined with the actual situation, to make the best design.
Value and effect
In the power system, most of the load in the active power consumption, but also requires a lot of reactive power, reactive power, and these are not the real load consumption, but in the form of electric and magnetic fields are exchanged, so reactive power will cause: occupying power plant capacity; increase transformer and transmission line losses; reduce device power supply voltage; generate reactive fines, increased electricity costs.
Reactive power compensation equipment must be installed in the distribution system, the nearest to provide load required reactive power, reactive power compensation for post-change user power factor above 0.9 may not have to pay higher electricity use force rate adjustment, power factor transformers the higher the rate, in the case of transferring the same power, the lower the power factor, the higher the current, the lower the line loss, the voltage loss is also smaller.
Induction, the reactive power compensation mainly has the following functions:
1, lower bus voltage loss, improve grid voltage level;
2, compensate reactive power, improve power factor;
3, the compensation of harmonic currents, reducing the harmonic current pollution on the grid;
4, compensate for the negative sequence current, reducing the negative sequence current pollution of the grid, the loss of the equipment;
5, the compensation is not affected grid frequency; easy resonance with the grid impedance occurs; strong overload;
6, faster response speed 5-10ms run a wider range of adjustment, rapid load changes follow;
7, reactive current and voltage control precision than SVC high, significantly increasing the life of precision equipment;
8 used in the new energy industry solve the low voltage ride through, dynamic tracking adjustment, power blurted other issues;
9, used in rail transportation, metallurgy, steel rolling, casting, mining, cranes and other industries to solve the three-phase unbalanced.