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Aodong Electric ADSVG Rolling Mill Dynamic Reactive Power Compensation Application Case
Compensation capacity: -4Mvar ~ + 4Mvar
System voltage: 10 kV
Load characteristics: When the rolling mill is rolling steel, the power grid voltage fluctuates greatly, the reactive power impact is large, the power factor is low, only 0.35, and the 5th, 7th, 11th and 13th harmonics exceed the standard.
Compensation effect: the power factor is compensated to 0.98, the reactive impact is eliminated at the system side, the voltage fluctuation of the power grid is limited within 1.5%, and the harmonic voltage meets the requirements.
Aodong ADSVG enhances grid stability, boosts transmission capacity, mitigates reactive power surges, filters harmonics, and balances three-phase power systems.
◆ Improve the stability of line transmission.
The installation of SVG device on long-distance transmission line can not only compensate the line reactive loss, raise the line voltage and improve the effective transmission capacity under normal operation, but also provide timely reactive power regulation, dampen system oscillation and improve the stability of transmission system under system failure.
◆ Maintain the receiving end voltage and strengthen the voltage stability of the system.
In load centers with high power demands and insufficient reactive power supply, voltage instability or even collapse may occur. SVGs, however, provide rapid reactive power regulation to stabilize voltage on the load side, thereby enhancing the voltage stability of the power supply system.
◆ Compensate the reactive power of the system, improve the power factor, reduce the line loss, save energy and reduce consumption.
In power systems, various loads such as asynchronous motors, arc furnaces, rolling mills, and large-capacity rectifiers require substantial reactive power during operation. Meanwhile, transformers and line impedance in transmission and distribution networks also generate reactive power, leading to a decline in system power factor. For power systems, a low power factor in loads increases energy losses and voltage drops in transmission lines, thereby degrading voltage quality. Additionally, reactive power reduces the utilization efficiency of power generation, transmission, and distribution equipment. For electricity consumers, a low power factor results in higher electricity bills and increased production costs.
◆ Suppress voltage fluctuations and flicker.
Voltage fluctuations and flicker primarily result from abrupt load variations. When loads change rapidly, they generate corresponding sharp current fluctuations. These fluctuating currents cause rapid voltage drop variations in the system, leading to flicker in the receiving grid. Typical loads that induce voltage flicker include arc furnaces, rolling mills, and electric locomotives.
SVG can quickly provide variable reactive current to compensate for voltage fluctuations and flicker caused by load changes.
At present, the best solution to suppress voltage fluctuations and flicker is to use SVG.
◆ Suppress three-phase imbalance.
The distribution network contains a large number of three-phase unbalanced loads, such as electric locomotive traction loads and AC arc furnaces. At the same time, the three-phase impedance imbalance of transmission and distribution equipment such as lines and transformers will also lead to the problem of voltage imbalance.
SVG can quickly compensate the negative sequence current caused by load imbalance, always ensure the balance of three-phase current flowing into the grid, and greatly improve the power quality of power supply and consumption.
product picture ：
The technical specifications of ADSVG from Aodong Electric are as follows:
Selection size:
Selection Notes: Typically, voltage and compensation capacity, industry, installation location, cooling method, and harmonic content must be provided.
Voltage: 6kV, 10kV, 35kV
Compensation capacity: ±0.1 Mvar to ±200 Mvar. If you cannot provide the exact capacity, you can provide the following materials:
1. Primary power supply system diagram;
2. Multiple busbars, evaluation points (where is the current sampling?)
3. Tap the transformer nameplate
4. Electricity bills of the power supply bureau in the past three months.
Our technicians can calculate the required compensation capacity for you; if conditions permit, our technicians can carry the equipment to the site for measurement.
Industry: Traditional industry (petroleum chemical industry, power system, metallurgy, electrified railway, urban construction, etc.) and new energy industry (photovoltaic, wind power, energy storage, etc.)
Installation location: Outdoor or indoor. If there is indoor installation space, indoor installation is possible. If indoor installation space is insufficient, outdoor installation is required.
Cooling method: Wind cooling or water cooling. For large capacity or harsh environments (high wind, high humidity, high salt fog, high corrosion, high condensation, etc.) and high noise requirements, when conventional air cooling cannot meet the on-site environmental requirements, water cooling should be selected.
Harmonic content: ADSVG can simultaneously achieve reactive power compensation and harmonic mitigation. However, in scenarios with high harmonic content, a FC high-voltage filter compensation device is required to effectively remove harmonics.
Aodong Electric's ADSVG series products are widely used in petrochemical, power systems, metallurgy, electrified railways, urban construction, and related industries. These solutions provide high-quality, reliable reactive power compensation and filtering for various equipment including asynchronous motors, transformers, thyristor converters, frequency converters, induction furnaces, lighting systems, arc furnaces, electric locomotives, hoists, cranes, stamping machines, lifting equipment, wind turbines, welding machines, resistance furnaces, and quartz melting furnaces.
The ADSVG series products from Aodong Electric can enhance power transmission capacity, reduce energy loss, compensate reactive power, control harmonics, suppress flicker, stabilize grid voltage, balance three-phase systems, modify system damping characteristics, and improve system stability.
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