Hybrid Var Compensator in Photovoltaic Power Generation Transformation
YTPQC-HPFC Hybrid Static Var Generator can perform the following functions: Fast reactive power calculation module, can realize power factor calculation, static reactive power generator power calculation and other functions;The reactive power optimization distribution module can realize the functions of determining the switching control of the capacitor group and determining the reactive power output of the reactive power generator;SVG module, can realize the output voltage and current feedback control, PWM control selection and other modules;Human-machine interface module, can realize the LCD panel interface access function;DSP control module can realize signal acquisition, PWM output, human-machine interface function and external communication functions.
In the reactive power optimization distribution module, the device adopts SVG and TSC mixture for reactive power compensation, SVG detects the reactive power system, controls the capacitor switching, and determines the capacity and moment of reactive power generation.
The Background
Shanghai Trust Electric Co., Ltd. due to the low power factor, will produce a certain amount of electricity charges (fine), last year a total amount of fines reached 30,000 yuan.At present, the company has added photovoltaic power generation equipment in the park, resulting in lower site power factor, more serious fines, and in recent months, electricity fines have reached 2~3W.The customer hopes to control the power quality of the park and solve the problem of electricity fee fine.
The PQ Problem
Capaciitor cabinet is used for reactive power compensation on site. Due to the ladder of capacitors compensation and slow response speed, reactive power cannot be quickly and completely filtered in the grid.In the case of a certain reactive power, the active power on the meter is small, the calculated power factor will be low, resulting in a fine.
At the same time, we found that the harmonic current content on the low voltage side of T1 transformer exceeded the standard. After field observation, we found that the harmonic is generated by the capacitor in the capacitor cabinet. After the capacitor is put into the grid, the resonance leads to harmonic amplification.Harmonic current will also lead to power factor reduction, and has great harm to the capacitor, easy to cause capacitor damage.
The Solution YTPQC-HPFC
According to the actual situation on the site, in order to solve the problem of site fine, the reactive power in the 10kV system should be treated, and the compensation accuracy demand is extremely high, so the YTPQC-HPFC Hybrid Static Var Generator must be used to make reactive power compensation.
At present, the remaining reactive power on site is about 200kvar. Considering a certain allowance and subsequent load increase, it is recommended to configure YTPQC-HPFC Hybrid Static Var Generator 400kvar for reactive power management.
The Technical Performance
After the installation of the equipment, in order to verify the compensation effect of the equipment, we conducted a three-day power quality test with FLUKE. It can be seen from the reactive power curve that the far left is the compensation equipment reactive power before the operation, and the total reactive power of the three phases is about 200kvar.After YTPQC-HPFC Hybrid Static Var Generator treatment, the reactive power on the high voltage side is reduced to about 20kvar, and the power factor is basically maintained at about 1.00, and the compensation effect is good.
Reactive power before compensation | Reactive power after compensation |
Power factor before compensation | Power factor after compensation |
The Photos
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