Wei-xing Lin: new energy power generation and calling soft straight transmission technology

On February 18, after the meeting, the industry spread out a draft subsidy policy, the main approach to limit total subsidy of 3 billion yuan; Households with project specific subsidies; Industry and commerce, ground power station with the method of bidding for subsidies indicator; ’ Declare the tender organized by the provincial, but ordered by the national unity; Reduce 1 cent per kilowatt-hour subsidy standard per quarter.

　　“ Worldwide at present, photovoltaic power generation is mainly through the ac power grid directly, or communicate with thermal power, hydropower, local grid bundle, then through uhv dc transmission to the load center. Photovoltaic power generation will call new transmission technology in the future. ” Held on June 4th pv show in Shanghai, change especially electrician wholly-owned subsidiaries of xinjiang new energy co. , LTD. Xian change especially electrician flexible transmission and distribution co. , LTD. , the chief engineer wei-xing Lin in an interview with the China electric power news reporter said that with the increasing of photovoltaic power generation scale, flexible HVDC can independent photovoltaic power generation in the form of direct delivery to the load center, its scale will continue to expand.

wei-xing Lin: flexible HVDC technology for power grid in recent years one of the most popular transmission technology field. Put into operation in 2011 in China & plusmn; 30 kv / 18 megawatts of Shanghai nanhui flexible HVDC project, is the third in the world to master flexible HVDC technology.

flexible direct current transmission technology in China from & plusmn; 30 kv, successively completed & plusmn; 160 kv three-terminal soft engineering, south Australia & plusmn; Soft engineering, 200 kv zhoushan five end & plusmn; 320 kv, xiamen engineering & plusmn; 350 kv luxi back-to-back project, & plusmn; 420 kv chongqing hubei road engineering, is building & plusmn; 500 kv Zhang Bei flexible dc power grid project and & plusmn; 800 kv uhv soft straight east German engineering. Iteration with broad market demand for products, voltage grade flexible direct current transmission technology in China is a world leading level, power rating.

power transmission and transformation technology mainly include ac power, dc transmission technology and flexible HVDC technology. Reactive power consumption exist in the process of ac power transmission technology, is not suitable for long distance, large capacity power; Conventional HVDC technology refers to using thyristor dc transmission technology, does not have the commutation ability, does not have the ability of independent connection of new energy power generation, ac power grid or ac power need to form a complete set of construction; Flexible HVDC IGBT power all control type power electronic devices, such as the commutation ability, can establish their own control ac voltage, can the independent direct connection of new energy power generation.

power grid remote areas in China and abroad in less developed areas such as Africa, South America, photovoltaic, wind power and other new energy power generation through the flexible dc direct supply to the load center, and in the center of the load to the nearest configuration energy storage device, which can help the large-scale development of less developed areas of new energy power generation, and avoid the communication network frame of the new construction investment.

flexible HVDC technology can be easily constitute multiterminal HVDC, dc power grid, which can be found in more extensive regional range will wind power, photovoltaic power generation, energy storage power station united interconnection, decorate in the appropriate location pumped storage power station, hydrogen power, bring down the new energy power generation volatility and intermittent.

mudflats and offshore wind power resources in China has won a large number of development, the future offshore wind will gradually move to the open sea. Due to the effect of reactive power charging communication cable, when the submarine cable length of more than 70 km, adopting ac submarine cable in technology cannot meet the requirements of offshore wind power is sent out, flexible HVDC technology is currently the only feasible offshore wind power grid technology. In offshore wind flexible HVDC system, flexible dc inherits the change especially electrician offshore wind change especially electrician electrical equipment of complete sets of experience, with excellent Marine environment adaptability, inclined resistance, resistance to vibration, anti-interference, resistance to corrosion.

wei-xing Lin: change especially electrician in early 2014 formally in flexible HVDC system, with a full range of flexible HVDC equipment industry chain, with the new energy power station construction to new energy power transmission and transformation of the whole process of turnkey project delivery capabilities. Have a full set of equipment such as flexible HVDC project required converter valve, valve control system, soft straight transformer, reactor, dc reactor, bridge arm sleeve, GIS, etc. , through a complete set of optimized design, make flexible HVDC project to achieve the optimal economy and technology.

to solve the problem of large-scale clean energy base of the long distance power transmission, change especially electrician invested nearly 400 million yuan to build the country's largest energy Internet and power electronics laboratory. Change especially electrician, developed jointly with southern power grid company, in May 2017 successfully developed the world's first & plusmn; 800 kv / 5000 mw high pressure flexible HVDC converter valve, flexible HVDC technology for the first time by the country's & plusmn; Increase the level of a 500 kv ehv transmission to & plusmn; 800000 kv high-voltage direct current transmission level, capacity from 3 million kw to 5 million kw, and without locking overhead flexible HVDC technology is put forward.

on equipment development platform, change especially electrician has a full set of IGBT platform, IGBT double pulse pressure test platform, a power module to run the test platform, the short circuit test platform to run the test platform, valve paragraphs, valve tower flash test platform, & plusmn; 10 kv / 60 megawatt prototype test platform, soft straight valve control system real-time simulation platform, can complete soft straight converter valve from the device to the full range of testing of a prototype.