6kV Outdoor static var generator(SVG)

The 6kV outdoor static reactive power generator (SVG) is a high-performance dynamic reactive power compensation device designed specifically for medium and high voltage distribution networks. It adopts an outdoor specific design (protection level IP44) and is suitable for complex outdoor working conditions. The product uses a multi chip DSP+FPGA as the control core, integrating instantaneous reactive power theory control technology, FFT fast harmonic calculation technology, and high-power IGBT driving technology. It is directly connected to the power grid through a cascaded power unit structure, without the need for additional boosting transformers, and can quickly and continuously provide capacitive or inductive reactive power. At the same time, it achieves dynamic harmonic compensation, effectively improves power quality, enhances grid stability, and has high reliability, ease of operation, and excellent performance. It is the core compensation solution for outdoor industrial scenes and power systems.

System structure and working principle

Core structure

• Cascade power unit: adopting a cascade design, integrating multiple sets of high-performance IGBT modules, and withstanding high voltage of 6kV~35kV through series connection to ensure stable operation of the equipment.

• Control core: Equipped with a multi chip DSP+FPGA control system, it has fast computing speed and high control accuracy. It communicates with various power units through Ethernet, RS485 and other interfaces to achieve status monitoring and command issuance.

• Auxiliary structure: Configure a grid side coupling transformer with functions of filtering, current limiting, and suppressing current change rate; The outdoor cabinet meets the IP44 protection standard and is suitable for harsh outdoor environments.

Working principle

• The controller monitors the load current of the power grid in real-time. Based on the theory of instantaneous reactive power and FFT fast harmonic calculation technology, it instantly analyzes the required reactive current and harmonic components. Through PWM pulse width modulation technology, it controls the switching state of the IGBT module, generates reactive compensation current synchronized with the grid voltage and offset by 90 degrees in phase, accurately offsets the reactive power of the load, and dynamically compensates for harmonic components. The ultimate goal is to only transmit active power on the grid side, achieving multiple objectives of power factor optimization, voltage stability, and harmonic suppression, ensuring efficient and stable operation of the power system.

Cooling method

• Forced cooling (AF/Air Cooling)

• Water Cooling

Heat dissipation mode

Main Features

• Advanced technology and comprehensive compensation: Integrating DSP+FPGA dual core control, instantaneous reactive power theory, and FFT harmonic calculation technology, it can not only automatically and continuously smooth adjust capacitive/inductive reactive power, but also dynamically compensate for harmonics, achieving integrated management of "reactive power & harmonics".

• Dynamic precision and rapid response: response time<5ms, compensation current resolution 0.5A, supports stepless smooth compensation, effectively suppresses voltage flicker caused by impact loads (such as electric arc furnaces and frequency converters), and ensures stable operation of equipment.

• Stable and reliable, suitable for outdoor use: adopting a dual power supply design, supporting seamless backup switching; Redundant design meets the operational requirements of N-2, with multiple protection functions (overvoltage, undervoltage, overcurrent, overheating, etc.) fully covering fault scenarios; IP44 outdoor protection level, able to withstand operating temperatures of -35 ℃~+40 ℃, humidity &le; 90%, and seismic intensity of VIII degrees, suitable for complex outdoor environments.

• Efficient and environmentally friendly, with lower energy consumption: system power loss<0.8%, harmonic distortion rate THDi<3%, minimal pollution to the power grid; No additional transformer losses, balancing energy conservation and environmental protection needs.

• Flexible adaptation and strong scalability: supports multiple operating modes such as constant reactive power, constant power factor, and constant voltage; Compatible with multiple communication protocols such as Modbus RTU and IEC61850; It can achieve multi machine parallel networking, multi bus comprehensive compensation, and modular design for easy expansion.

• Easy to operate, maintenance tips: The device design takes into account usability, and attention should be paid to timely cleaning of the filter cotton. It is recommended to clean it at least once every two weeks to ensure heat dissipation and operational stability.

Technical Specifications

Specifications and dimensions of 6kV outdoor products 

Air cooling type：

Water cooling type

Note:

• Capacity (Mvar) refers to the rated regulation capacity within the dynamic regulation range from inductive reactive power to capacitive reactive power.
• The air core reactor is used for the equipment, and there is no cabinet, so the placement space needs to be planned separately.
• The above dimensions are for reference only. The company reserves the right to upgrade and improve the products. The product dimensions are subject to change without notice.

Application scenarios

• Power system: Adapt to various levels of distribution networks, stabilize grid voltage, balance three-phase systems, reduce power losses, and enhance power transmission capacity.
• In the field of heavy industry: metallurgy (electric arc furnace, induction furnace), mining (hoist), ports (crane) and other scenarios, compensating for reactive power and harmonics of impact loads, and suppressing voltage flicker.
• Petrochemical and manufacturing industry: Provide compensation for asynchronous motors, transformers, thyristor converters, frequency converters and other equipment, improve power quality, and ensure production continuity.
• In the field of new energy, wind farms, photovoltaic power stations, etc. are used to alleviate power fluctuations caused by intermittent power generation and ensure stable grid connected voltage.
• Transportation and urban construction: electrified railways (traction power supply system), urban rail transit (elevators, cranes), solving negative sequence and reactive power problems; Urban distribution network renovation to enhance power supply reliability.
• Other scenarios: outdoor working conditions that require reactive power compensation and harmonic control, such as lighting equipment, welding machines, resistance furnaces, quartz melting furnaces, etc.