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RNSVG Series LV Dynamic Power Quality Control Device

Product Description

Low-voltage RNSVG is the latest product of dynamic static var generator (short as SVG), representing the latest technology applied in the field of reactive power compensation. It uses the high-power IGBT device to replace ordinary thyristor. As an advanced reactive power compensation device of more reliability and flexibility, it plays a greater role in the field of power quality research. Its outstanding advantages are as follows: quick in response, absorption of continuous reactive power, generation of small higher harmonics, wide-ranged adjustment, low losses and noises.

Working principal:

Low-voltage RNSVG applies technologies of power electronics, computer and modern control into the electric power system. It connects the voltage source inverter (VSC) in parallel at the AC side to power grid, adopts advanced direct current control technology to flexibly and speedily control the current at the AC side directly, conducts the continuous reactive power adjustment from inductive to capacitive, meeting a demand of speed compensation on reactive power in order to suppress voltage fluctuations and enhance system stabilities. RNSVG dynamic compensates the reactive power current and harmonic current to lessen line losses, enhance the capability of active power transmission, suppress harmonics and improve power quality. Low-voltage RNSVG applies technologies of power electronics, computer and modern control into the electric power system. It connects the voltage source inverter (VSC) in parallel at the AC side to power grid, adopts advanced direct current control technology to flexibly and speedily control the current at the AC side directly, conducts the continuous reactive power adjustment from inductive to capacitive, meeting a demand of speed compensation on reactive power in order to suppress voltage fluctuations and enhance system stabilities. RNSVG dynamic compensates the reactive power current and harmonic current to lessen line losses, enhance the capability of active power transmission, suppress harmonics and improve power quality.

Technical Characteristics:

● It is equipped with the running ability of anti-harmonic, and increase the reliability of reactive power devices.
As the most advanced active power generator, RNSVG’s harmonic current in system will not cause over-load damages to itself, but to considerably increase the device reliability. However, the traditional capacitor compensator shall amplify the harmonic in system, which in reverse caused a faulted capacitor by the magnified harmonics, lowering the reliability of reactive power compensator to a great amount.
● It completely avoids the resonance and greatly enhances the safety of system running.
RNSVG’s property of power source avoids the possibility of a resonance in theory, which greatly enhances the running safety of the power distribution system. But the traditional passive compensator is haunted by the possibility of a series or parallel resonance, a hazard in safety operation.
● Quick in response proves a better compensation.
RNSVG, an active power generator cored with a 1GBT fully controlled high power electronic device, has the fastest response in control, being less than 1ms, and in closed loop, less than 5ms. The perfection in power quality is closely related to the speed of response. A higher speed of response has better effect on voltage flicker and fluctuation.
● The core switching device IGBT
Using the fifth-generation IGBT, the switching frequency is higher and the loss is smaller than the fourth-generation IGBT. At the same time, the algorithm adopts parallel computing technology and multi-core CPU parallel computing, so the control algorithm can be completed in a shorter time.
●  Equivalent switching frequency
Up to 80kHZ, the core technology of extremely high current loop bandwidth can achieve faster response speed and higher reliability.
●  Power loss
Less than 2.5%, the greater the active power loss, the more serious the equipment heats up. In power electronic equipment, 50% of the faults are caused by internal heating that causes damage to the electronic parts, so reducing the active power loss is very important. The fifth-generation IGBT is used to reduce the switching loss.
● Extremely quiet noise
60dB, the noise of the device is very important to the user experience. The noise mainly comes from two aspects. One is for heat dissipation. The sound generated by the air circulating in the module and the fan sound. If the loss is low, the heat is small, so the fan noise is only Will be small. The second source is the noise of the reactor. The high frequency switching current of IGBT makes the reactor noise. The higher the switching frequency, the lower the reactor noise. Because the switching frequency is high, the noise can be less than 60dB.
●  Two-way adjustment of capacitive and reactive power, which can
automatically adapt to more working conditions RNSVG can not only emit capacitive reactive power, but also inductive reactive power, which can be automatically adjusted according to changes in working conditions. When the heavy load is removed and the capacitive reactance increases suddenly (the power consumption side is capacitive), the voltage will rise. In this case, RNSVG can automatically absorb the excess reactive power in the system and reduce the voltage to a normal level To ensure the safety of electrical equipment run.
● Have the ability to try to remove harmonics, clean power energy
RNSVG has a certain harmonic filtering ability. While providing dynamic reactive power, the remaining capacity can filter out 2-13 spectrum waves, playing a role in clean power energy and control power pollution.

Technical index:

Product features

Rated voltage: AC380±15%,AC660±15%
Operating frequency: 50±5%
Reactive compensation: Optional mode, a uto control of capacity
Reactive power adjustment range: A continuous and stepless a djustment between the
rated inductive reactive power to the rated capacitive reactive power.
Response time: 1ms
Active power los s: <3% under rated module power
Overload capacity: 120%
Operation way of multi-machine: Parallel running
Meantime between failure: ≥ 100,000 hours

Control features

Switch frequency: 10kHz in average
Control algorithm: Field screening vector compensation a lgorithm with self-adaptive capability
Way of Control: Closed loop control
Controller: Digital DSP
Communication function: Remote communication protocol of Modbus, RS485/232 /LAN c ommunication interface
Control connection: Optical fiber or electrical connection

Structure features

Protection level: IP20 or customized at custo mer’s demands
Color: RAL7035 (Light grey), other colors ca n be provided at re quest.
Way of cooling: Forced air cooling
Overall structure: Floor stand
Way of Installation: Indoor installation, optional methods of fastening and incoming cable wires

Environmental conditions

Environment temperature: -25℃-+40℃
Storage temperature: -25℃-+55℃
Relative humidity: 95% at maximum, free from c ondensation
Altitude: Installed at an altitude of less than 2000 mete rs
Electromagnetic compatibility: In conformity with GB/T7251-2005 (GB/T7261-2000), including pulse train disturbance to damping oscillation waves, electrostatic discharge disturbance, radiated electromagnetic field disturbance, fast transient disturbance, surge (impact) disturbance degree, voltage interruption disturbance resistance, electromagnetic emission test, etc.

Product Model

Model Explanation:

Application occasion:

It is used in the reactive power compensation for AC motor, rectification, frequency conversion, medium-and-high frequency induction heating, welding and mixed loads, etc. It applies to low-voltage high-power electrolysis, electroplating, electric arc furnace, pumping unit of oilfield, steel rolling factory, chemical engineering, intermediate frequency furnace, subway, machinery factory, wind power station, pump station, port, automobile factory, exhibition venues, office buildings, and etc.

Product specification:

Product specification model table

Remark: 1. The above are the regular specifications, other unlisted models can be consulted;
2. If there are any changes to equipment size, please confirm and subject to the latest design.

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