35kV Outdoor Static Var Generator (SVG)

Product Overview

The 35kV outdoor static reactive power generator (SVG) is a high-performance dynamic reactive power compensation device designed specifically for high-voltage distribution networks. It focuses on the requirements of 35kV high-voltage scenarios and adopts outdoor specific optimized design (protection level IP44) to adapt to complex outdoor harsh 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 35kV power grid through a cascaded power unit, without the need for additional boosting transformers, and can quickly and continuously provide capacitive or inductive reactive power, while achieving dynamic harmonic compensation. Combining the core advantages of perfect craftsmanship, durability and reliability, and "dynamic static combination" compensation, it can effectively enhance the transmission capacity of high-voltage distribution networks, reduce power losses, and stabilize grid voltage. It is the core compensation solution for high-voltage outdoor power systems, large-scale industrial projects, and new energy grid integration.

System structure and working principle

Core structure

• Cascade power unit: adopting a cascade design, integrating multiple sets of high-performance IGBT modules, and synergistically withstanding 35kV high voltage through series connection to ensure stable operation of the equipment under high voltage conditions; Some models support 35kV step-down (35T type) design, adapting to different grid access requirements.

• Control Core: Equipped with a multi chip DSP+FPGA high-performance control system, fast computing speed and high control accuracy, through Ethernet RS485、CAN、 Fiber optic interfaces communicate in real-time with various power units to achieve status monitoring, instruction issuance, and precise control.

• Auxiliary structure: equipped with a grid side coupling transformer, which has the functions of filtering, current limiting, and suppressing current change rate; The outdoor dedicated cabinet meets the IP44 protection standard and can withstand high and low temperatures, high humidity, earthquakes, and Class IV pollution environments, adapting to complex outdoor climate and terrain conditions.

Working principle

• The controller monitors the load current and voltage status of the 35kV power grid in real-time, and based on the instantaneous reactive power theory and FFT fast harmonic calculation technology, instantaneously analyzes the reactive current components and harmonic interference components required by the power grid. By using PWM pulse width modulation technology to accurately control the switching timing of IGBT modules, a reactive power compensation current synchronized with the grid voltage and phase shifted by 90 degrees is generated to accurately offset the reactive power generated by the load, while dynamically suppressing harmonic distortion (THDi<3%). The ultimate goal is to only transmit active power on the power grid side, achieving multiple objectives of power factor optimization (usually required to be ≤ 0.95 overseas), voltage stability, and harmonic control, ensuring the efficient, safe, and stable operation of high-voltage distribution networks.

cooling method

• Wind cooling 

• Water Cooling

Heat dissipation mode

Mian features

• High voltage adaptation, large capacity compensation: rated voltage of 35kV ± 10%, output capacity coverage of ±0.1Mvar~±200Mvar, supporting ultra large capacity reactive power regulation (maximum 84Mvar for air-cooled type, maximum 100Mvar for water-cooled type), perfectly adapting to the compensation needs of high voltage distribution networks and large loads.

• Dynamic and static combination, precise compensation: response time<5ms, compensation current resolution 0.5A, supporting capacitive/inductive automatic continuous smooth adjustment. The "dynamic and static combination" compensation method not only meets the basic compensation of steady-state loads, but also quickly responds to voltage flicker caused by impact loads (such as large electric arc furnaces and wind farm fluctuations), with industry-leading compensation accuracy.

• Stable and reliable, durable outdoors: adopting a dual power supply design, supporting seamless backup switching; Redundant design meets the operational requirements of N-2, equipped with multiple protection functions such as unit overvoltage/undervoltage, overcurrent, overheating, and drive failure, comprehensively avoiding operational risks; IP44 outdoor protection level, able to withstand operating temperatures of -35 ℃ to+40 ℃, humidity of ≤90%, seismic intensity of VIII degree, and pollution environment of IV level. The process is mature and durable, suitable for complex outdoor working conditions.

• Efficient and environmentally friendly, with extremely low energy consumption: system power loss<0.8%, no additional transformer loss, significant energy-saving effect; The harmonic distortion rate THDi is less than 3%, which causes minimal pollution to the power grid and meets the environmental protection operation standards for high-voltage power grids.

• Flexible expansion, strong adaptability: supports multiple operating modes such as constant reactive power, constant power factor, constant voltage, load compensation, etc; Compatible with various communication protocols such as Modbus RTU, Profibus, IEC61850-103/104, etc; It can achieve multi machine parallel networking, multi bus comprehensive compensation, modular design for easy expansion in the later stage, and adapt to different high-voltage power grid architectures.

Technical Specifications

Specifications and dimensions of 35kV outdoor products
 Air cooling type

Water cooling type

Note:
1. Capacity (Mvar) refers to the rated regulation capacity within the dynamic regulation range from inductive reactive power to capacitive reactive power.
2. The air core reactor is used for the equipment, and there is no cabinet, so the placement space needs to be planned separately.
3. 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

• High voltage power system: 35kV distribution network, long-distance transmission lines, stable grid voltage, balanced three-phase system, reduced line losses, improved power transmission capacity and supply reliability.

• Large scale new energy power plants: Large scale wind farms and photovoltaic power plants alleviate power and voltage fluctuations caused by intermittent power generation, meet grid connection standards, and enhance the capacity for new energy consumption.

• Heavy industry high-voltage scenarios: metallurgy (large electric arc furnaces, induction furnaces), petrochemicals (large compressors, pump equipment), mining (high-voltage hoists), ports (high-voltage cranes), etc., compensating for reactive power and harmonics of high-voltage impact loads, suppressing voltage flicker, and ensuring stable operation of production equipment.

• Electrified railway and urban construction: Electrified railway traction power supply system (solving negative sequence and reactive power problems), urban high-voltage distribution network transformation, large-scale building complex high-voltage power supply system, improving power supply quality and stability.

• Other high-voltage load scenarios: reactive power compensation and harmonic control for high-voltage asynchronous motors, transformers, thyristor converters, quartz melting furnaces and other equipment, suitable for various high-voltage outdoor working conditions.