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Qinghai: new energy distributed condenser group to ensure "power transmission from west to East"

日期: 2021-12-01
浏览次数: 1

On November 26, with the completion of 168 hour trial operation of No. 3 shunting camera of Zhuyu 330kV collection station, the first batch of 16 50 MVA distributed shunting camera projects of 4.05 million KW supporting power supply points of phase I of 'Qingyu DC' UHV project built by the State Power Investment Group upstream Yellow River Hydropower Development Co., Ltd. (hereinafter referred to as the Yellow River company) were all connected to the grid and put into operation.

This marks the formal formation of the world's largest new energy distributed condenser group, which will effectively ensure that the 'Qingyu DC' project has a transmission capacity of 4 million KW.

'Exploring the practice of large-scale installation of distributed condenser on the power side for the first time in the world will effectively solve the problem of voltage stability caused by cross regional DC transmission and large-scale access of new energy to the power grid, which is of great significance to accelerate the transformation and development of energy.' Xue Ning, director of Engineering Technology Department of Huanghe company, said.

The speed of national energy structure adjustment and clean energy transformation has accelerated, and UHV DC transmission has become an important carrier for cross regional transmission of clean energy such as water, wind and light. In September 2020, Huanghe company completed the 4.05 million KW 'Qingyu DC' project supporting power supply project with the largest one-time operation scale and the shortest construction time in the world, accounting for 81% of the 5 million KW supporting power supply project. However, there are problems of randomness, intermittence and fluctuation in new energy power generation. In addition, the installed scale of conventional power supply in Qinghai and Hainan is small and the voltage support capacity is relatively weak, which seriously restricts the normal 'power' of new energy power stations.

The new energy distributed condenser has the advantages of simple system, high integration and good regulation performance. It can not only play the role of system dynamic reactive power reserve, but also provide sub transient, transient and steady-state reactive power compensation and voltage support for new energy power stations, which will greatly improve the new energy transmission capacity of the important channel of 'west to East power transmission', It can be used as a reference and demonstration for large-scale centralized development of new energy.

'In the design stage, we consider the future operation and maintenance, and design according to modularization, intelligence and integration of operation and maintenance.' Li Zhi, executive director of new energy investment and Development Co., Ltd., said that after all 21 adjustable cameras are put into operation, it is expected to increase the new energy power generation capacity of 3.15 million kW in Qinghai and Hainan, with an average annual increase of 7.02 billion kwh, It is equivalent to reducing 3.189 million tons of coal and 5.742 million tons of carbon dioxide, with significant economic and environmental benefits.

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