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Technical Article: Application of High-power AC Power in Wind Power Industry

“By 2030, China’s carbon dioxide emissions per unit of GDP will drop by more than 65% compared to 2005, non-fossil energy will account for about 25% of primary energy consumption, and forest storage will increase by 6 billion cubic meters from 2005. Wind power , The total installed capacity of solar power will reach more than 1.2 billion kilowatts.”

Introduction To commemorate the 5th anniversary of the Paris Agreement to address climate change, the United Nations and relevant countries held a climate ambition summit by video on December 12. At the meeting, China proposed:

“By 2030, China’s carbon dioxide emissions per unit of GDP will drop by more than 65% compared to 2005, non-fossil energy will account for about 25% of primary energy consumption, and forest storage will increase by 6 billion cubic meters from 2005. Wind power , The total installed capacity of solar power will reach more than 1.2 billion kilowatts.”

In 2019, China’s non-fossil energy accounted for 15.3%, and the goal of 15% of the 16-year agreement signed in 2020 was completed one year ahead of schedule.

Renewable energy includes hydropower, wind energy, solar energy, biomass energy, tidal energy, geothermal energy, etc. Wind energy is the kinetic energy obtained by the uneven heating of the earth’s surface due to solar radiation, resulting in uneven pressure distribution in the atmosphere and moving the air in the horizontal direction. It is estimated that the exploitable wind energy on the earth is about 2*107 MW, which is 10 times that of hydropower. As long as 1% of the wind energy is used, the global energy demand can be met. As of the end of 2019, China had 210 million kilowatts of wind power installed, and 405.7 billion kilowatt-hours of wind power generation, accounting for 5.5% of domestic power generation. The new energy development goals are a boost for the new energy industries such as photovoltaics and wind power.

Technical Article: Application of High-power AC Power in Wind Power Industry

Wind farm is the core part of wind power generation. The electrical part of wind farm is composed of primary part and secondary part. The electrical primary system of a wind farm can be divided into four main parts: wind turbines, power collection systems, booster stations and auxiliary power systems. Mainstream wind turbines in wind farms have an output voltage of 690V, which is boosted to 10kV or 35kV through a box-type step-up transformer, and then boosted to 110kV or 220kV through a main transformer, and then connected to the grid through a high-voltage overhead line.

Technical Article: Application of High-power AC Power in Wind Power Industry

Manufacturers in the wind power industry require AC power supplies with AC 690Vrms output and rich programmable functions to complete the simulation of wind turbine output. Most of the AC-flow control power supplies on the market are around AC 300Vrms, which is difficult to meet the test requirements.

IT7800 series high-power programmable AC/DC power supply voltage can reach 350/500 VL-N. Different output modes such as single-phase, three-phase and reverse phase can be selected to simulate three-phase unbalance, three-phase harmonic unbalance, and lack of phase. Various tests such as test, phase sequence reverse connection, etc. The reverse mode can provide a doubled voltage output up to AC700/1000Vrms phase voltage, which can cover a variety of high-voltage test requirements such as wind power generation and coal mines without connecting in series.

Technical Article: Application of High-power AC Power in Wind Power Industry
Figure 1 IT7800 measured 700Vrms output waveform

Technical Article: Application of High-power AC Power in Wind Power Industry
Figure 2 Schematic diagram of IT7800 three-phase mode output measurement interface

IT7800 series has 3U/15kVA ultra-high power density, the maximum power can be expanded to 960kVA, large-capacity AC and DC output, the output frequency is up to 2400Hz, and it also has the 50th harmonic simulation and analysis function, and a single machine can test 1~3 to-be-tested at the same time. Things. It can simulate arbitrary waveform output, support CSV file import waveform, and has AC measurement and analysis functions. It can be widely used in different stages of product development, production, and quality inspection in multiple fields such as distributed energy, smart grid, and new energy.


""By 2030, China’s carbon dioxide emissions per unit of GDP will drop …