Recently, Zhangbei Renewable Energy Flexible DC Power Grid Test Demonstration Project officially started. This is the world's first flexible DC power grid project, and it is also the world's highest flexible DC project with the highest voltage level and largest transmission capacity. According to Shu Yinbiao, chairman of the State Grid Corporation of China, the core technology and key equipment of the project are internationally pioneered, and will create 12 world firsts. Innovation leading and demonstrating is of great significance.
The Economic Daily reporter learned that the rated voltage of the project is ±500 kV, and 666 km ± 500 kV DC transmission lines will be built, and four converter stations in Zhangbei, Kangbao, Fengning and Beijing will be built. The total commutation capacity will be built. 9 million kilowatts; the total investment of the project is 12.5 billion yuan, and strive to ensure that all operations will be completed and put into operation in the first half of 2020.
Flexible DC transmission is a cutting-edge technology in the field of power grid technology today. It has obvious advantages such as good controllability, flexible operation mode and applicable occasions. It has unique advantages in remote areas and offshore new energy grid-connected, asynchronous grid interconnection and other application fields.
Specifically, the flexible DC adopts a fully-controlled power electronic device that can be automatically turned off. It does not require an AC system to support commutation, and has dynamic reactive power support capability, which can effectively suppress AC voltage fluctuations and reduce power fluctuations on the receiving power grid; At the same time, it also has the advantages of long transmission distance and large transmission capacity, which can support large-scale development of new energy. The DC power grid based on flexible DC transmission technology can realize multi-power supply, multi-drop power receiving and new energy island access, which has better economy and flexibility, and can be used for wind power, photovoltaic, pumped storage and load center. Direct connection, which constitutes an energy Internet with multiple forms of energy and flexible complementation, can effectively suppress the volatility of new energy. In addition, the DC grid can also achieve rapid removal and isolation of faults, and can fully utilize the network advantages of the DC grid to greatly improve the reliability of power transmission.
Shu Yinyu said that the construction of Zhangbei flexible DC project has significant comprehensive benefits and strategic significance for promoting energy transformation and green development, serving Beijing's low carbon green winter Olympics, leading scientific and technological innovation, and promoting the transformation and upgrading of equipment manufacturing industry.
Zhangjiakou, Hebei Province is a national comprehensive demonstration zone for renewable energy. It currently has a installed capacity of more than 10 million kilowatts and is planned to exceed 20 million kilowatts in 2020. However, local capacity for consumption is insufficient and it needs to be sent out on a large scale. The construction of this project will realize the connection between Zhangbei New Energy Base and Fengning Energy Storage Power Supply and Beijing Load Center, promote the complementary and flexible consumption of various forms of energy, improve the safety and stability of the power system, and apply flexible DC transmission for large-scale applications in China. Experience in building DC grid accumulation.
More importantly, the project will help China seize the commanding heights of global power grid technology. “Zhangbei Flexible DC Project is a major scientific and technological demonstration project integrating the friendly access of large-scale renewable energy, multi-form energy complementary and flexible consumption, and DC power grid construction.†Shu Yinyu said.
In addition, Zhangbei flexible DC project has the advantages of long industrial chain and strong driving force, which can effectively promote the development of electrical equipment industry; it will further promote China's original innovation in the field of flexible DC transmission and DC power grid, and promote higher voltage and greater. The innovative development of capacity flexible DC technology will drive the upgrading of power grid technology and equipment manufacturing industry, consolidate China's international leading position in the field of DC transmission technology, and create favorable conditions for the implementation of DC technology and major equipment “going out†strategy.
High Voltage Linear Power Supplies
HVLP series Linear High Voltage Power Supplies are High-voltage DC Power Supplies that achieve AC/DC conversion through power frequency transformers and transistor loop control. Compared with switching high voltage power supplies, linear high-voltage power supplies have higher stability, higher accuracy, and lower output ripple. And the most important, because of the use of the power frequency AC/DC conversion principle, the linear power supply has no high-frequency radiation interference, and it is especially suitable for use in places with restrictions on EMC and EMI.
The whole series linear power supply adopts industrial-grade metal chassis, pure copper AC/DC multi-insulation high-voltage transformer with varnish treatment, high-reliability multi-transistor filter loop, ensuring the power supplies can run for a long time at full load with high stability, high accuracy, and ultra-low ripple electronic characteristics, equipped with a complete protection circuit, which can better ensure the reliability of the linear power supply itself and the safety of the customer's load.
The output voltage and current can be adjusted by the 10-turn potentiometer with scale and lock on the front, equipped with 4 1/2-digit high-resolution LED meters for output value reading, and RS communication interface can also be added for remote control and monitoring of linear power supplies.
This series of linear high voltage power supplies are mainly used for gas discharge, high-voltage electronic tubes, and can also be applied for other electronic components burn-in test.
Because the output this power supply has HV, the output MUST be connected to the chassis for fixed grounding to ensure the personal safety of the user.
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Yangzhou IdealTek Electronics Co., Ltd. , https://www.idealtekpower.com