ISVG High Voltage Static VAR Generator

ISVG series high voltage static reactive power generator is a high voltage reactive compensation device developed, designed and manufactured by Shenzhen INVT Electrical Co., Ltd. It can compensate for reactive and the harmonic wave. It adopts advanced unit link-type topology structure with control system using DSP+FPGA+ARM three core technology, thus ensuring high control precision, fast dynamic response, etc.
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Product family

Application range


1.Power industry


Current situation:

Ø In the long distance transmission line, there is large transmission line loss and low voltage occurred to end users; the unstable electrical equipment and system stability have become increasingly prominent.


Solution:

Ø Install the iSVG device at the midpoint of long distance transmission line to compensate the reactive power of the circuit, reducing the transmission loss and improving the performance of power system;

Ø The iSVG device can maintain the dynamic voltage at the end of the line, strengthening the power grid voltage stability.


2.New energy power plants


Current situation:

Ø At present, the new energy power plant is mainly wind farms and photovoltaic power generation field;

Ø The randomness and intermittence of wind and solar power brings fluctuation to the output power of power generation unit;

Ø The large-scale wind farms and photovoltaic power generation field grid is easy to cause the power factor unqualified, voltage fluctuations and flicker, and affect the stable operation of power system.


Solution:

Ø The application of continuous and dynamic regulation of iSVG device in wind power field or photovoltaic power plant substation can realize the substation reactive power, improve the power factor of the system, reduce the electric power grid and grid access point of reactive power exchange until 0, realize the system of dynamic reactive power balance, reach the national standard of new energy power generation field power requirements;

Ø The iSVG device can be regulated through the compensation function, suppressing voltage fluctuation and flicker, thus playing the role of voltage stability.


3.Metallurgical industry


Current situation:

Ø The electric arc furnace, rolling mill and other metallurgical equipment is a typical nonlinear and irregular load;

Ø The use of the electric arc furnace, rolling mill will cause serious unbalance, resulting in a large number of harmful harmonics, voltage fluctuation and flicker, reducing system power factor.


Solution:

Ø ISVG dynamic reactive power compensation equipment featuring fast response. iSVG provides rapid load reactive current and stable voltage, improving the power factor of the system and minimizing the influence of flicker.

Ø The use of iSVG harmonic compensation function can effectively remove harmful harmonics and improve power quality in power supply system.


4.Rail transportation


Current situation:

Ø The electric locomotive is single-phase power supply;

Ø The electric locomotive operation not only produces a large number of harmonics, it will cause three-phase power supply network imbalance and low power factor.


Solution:

Ø Install iSVG along the railway line in the proper position to balance three-phase power and improve the power factor through three-phase unbalance compensation function;

Ø The iSVG has a good ability to stabilize the voltage and improve the traction transformer rate of equipment.


5.The coal industry


Current situation:

Ø The coal in the power supply system of hoist, winch and a large fan needs to consume a large amount of reactive power to establish and maintain the motor excitation current and excitation torque required in the work process, which makes the power supply system power factor is very low;

Ø Reactive impact is generated when load starts or stops, causing the voltage fluctuation and flicker;

Ø The transmission device will produce a large number of harmful harmonics of power supply system and its equipment will cause harm.


Solution:

Ø ISVG has the fast response ability which can provide reactive current to the load rapidly and stabilize the bus voltage, thus improving the power factor of the system and minimize the influence of flicker.

Ø Use iSVG harmonic compensation function to effectively remove harmful harmonics and improve power quality in power supply system.


6.The port industry


Current situation:

Ø The port handling machinery and equipment (crane, gantry crane, bucket) belong to the reactive impact load;

Ø Reactive impact is generated during operation, which causes voltage fluctuation and flicker, reducing the power factor;

Ø The rectifier and inverter devices will produce a large number of harmful harmonic.


Solution:

Ø iSVG has fast response ability and can compensate for the shock caused by impact load in real time, thus improving power factor;

Ø Use iSVG harmonic compensation function to effectively filter the harmonic generated by frequency converter and rectifier.


Application photos

Product features


1.Quick response:

1.1 Sampling time is as low as 80us, guarantee the response speed of the control system

1.2 Response time less than 5ms, to meet the shock load and voltage flicker compensation requirements

l < response time < 5ms


2.Small grid-connected harmonics

2.1 Using unique DC voltage balancing and multi-level vector control algorithm

2.2 Grid voltage harmonic less than 1%, better than similar products grid voltage harmonic 3%

2.3 The power units are connected in series, and the output waveform approaches sine wave after superposition


3.Small grid connected impact

Current waveform of power on impact


3.1 Self - start technology, grid connection without impact

3.2 Grid connected instantaneous current is only about 10A, the maintenance time is only 2~3ms


4.Excellent low voltage characteristic

When the voltage is reduced from 1 to 0.4, the output current of SVC is reduced from 1 to 0.4, and the reactive power output is reduced from 1 to 0.16

SVG output current maintains at 1 (even can run in short time overload area), output reactive power is reduced from 1 to 0.4, SVG output reactive power is 2.5 times of SVC


5.Small coverage

5.1 Small installation space, easy for daily maintenance

5.2 No parallel filter group, the occupancy area is greatly reduced and can be made mobile

5.3 Especially suitable for wind power, photovoltaic power generation and other applications of remote location and high cost

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