PQ HUB
China Power Grid Group
Hybrid Power Factor Correction
The Industry
Hybrid Power Factor Correction adopts the configuration scheme of combining YTPQC-ASVG Advanced Static var Generator and switching capacitor/reactor, and implements different reactive compensation schemes according to the actual needs of users on site, so as to achieve the best combination of price and effect.
Hybrid Power Factor Correction device consists of two parts: Static Var Generator and switching capacitor / reactor reactive compensation unit. Each unit is designed and produced in the method of low power, small volume and low cost, and both of them are optional, and can be combined in the best and flexible way according to the actual reactive state of the site, so as to achieve the optimum ratio of operation effect and cost.
Background
Residential community power grids belong to low-voltage distribution networks, generally connected to large power grids by 11/0.4kV transformers. Most of the loads in the grid work at three-phase 480V and single-phase 2230V voltage levels, mainly small-capacity loads, such as air conditioners, refrigerators, and televisions. Machines and other household appliances. Most household appliances are non-linear loads, which generate a large amount of reactive power during use.
Power Quality Problem
Reactive power is very important to the normal operation of the power grid system and load, but excessive reactive power has very prominent adverse effects. The specific manifestations are as follows:
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Increase equipment capacity: The increase of reactive power will lead to the increase of system current and apparent power, which will increase the capacity of generators, transformers and other electrical equipment and wires.
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Increase line loss: The increase of reactive power will increase the total current, thereby increasing the loss of equipment and lines, and the voltage drop of lines and transformers.
Solution
Hybrid Power Factor Correction is widely used in residential distribution networks. The compensation capacity is generally configured according to 30% of the transformer capacity, and the SVG capacity and capacitor capacity are generally configured according to user needs. The transformer capacity of a substation in a Shanghai community is 800kVA, and a Hybrid Power Factor Correction is configured on site, of which the SVG capacity is 50kvar and the capacitor capacity is 190kvar. After the equipment is running, the on-site power factor rises from 0.90 to about 1.
Performance
Reactive power and PF before compensation
Reactive power and PF after compensation
On-Site Picture
