Xinhua news agency, june 18th, beijing
Xinhua news agency journalist with a river
In the vast land of china, our first “windlight-fire-integration” delivery project — the ±800 kv direct transmission of electricity at high pressure — has recently become operational。
On a thousand-mile-long “electric artery”, the state grid chief scientist zheng yuping led the development of a system for the active protection of ultra-high voltage transformers, such as the installation of a “smart doctor” for the grid, with precision at a critical time to ensure the safe transmission of electricity。
Follow-up electricity protection as a “safeguard” of the power system carries the burden of preventing power outages. For the past four decades, zheng yuping has focused on the technical area of relay electricity protection, helping to achieve, with self-innovation, the level of technological capacity in this area in our country, a remarkable contribution to the safe and stable operation of the large electricity grid, from “following” to “runing”。
Cocoon
In the 1970s and 1990s, the electricity grid was frequently “sick” and more than half of the damage to stability was caused by the failure to protect relay power. At that time, high-end electricity protection equipment was almost monopolized by foreign enterprises, with an imported transmission line protection unit selling $7. 8 million and generator protection equipment amounting to $23 million. High costs do not allow for stable power supply。
Zheng yuping, born in the mountains of fujian, has a deep memory of the blackout. In 1983, he was admitted to the nanjing institute of automation, where he was attached to the electrical system protection control. “the scientific conditions at the time were difficult, the entire group shared a computer, assembled without the test equipment, and the information was extrapolated from zero. Zheng yu is a former student。
After entering the national electricity network, zheng yuping led the team in proposing a method of protection for ultra-high-tension line connections in a sensitive vertical direction, and successfully developed protection packages for ultra-high-tension transmission lines by cutting critical technologies for the protection of the serial lines and the protection of the twin lines with the tower. “these results were quickly applied to various types of ultra-high voltage transmission lines, including the first 500-kilovolt controlled circuit in the country, the first 500-kilovolt full line with the tower, major works such as the release of water and electricity from the second beach and the three canyons, and all of them, which produced more than $5 billion.” zheng yuping said。
Zheng yuping did not stop after the nationalization of the line protection. He also directed his eyes to the large-capacity main equipment protection set, leading the team in the development of a large-capacity transformer, generator sets, and a series of protective devices, such as electrical resisters, which made a huge leap from dependence on imports to self-production. The large-capacity generator transformer group protected over 60 per cent of the market and also sold to more than 20 countries, including brazil and turkey。
A technological breakthrough in the era of summit high pressure
In the twenty-first century, our electricity grid developed at a rapid pace, creating a particularly large and complex grid with the highest voltage level, the most distant transport distance and a conglomerate. However, new grid failure features pose new challenges to traditional conservation technologies. At a critical juncture, zheng yuping stepped up and took the initiative to undertake a number of national scientific and technical research projects。
In december 2008, china's first ultra-high-voltage line, jin-yung-south-south-southeast, was successfully completed with the demonstration of a 1000 kv high-voltage exchange project under the protective device developed by zheng yuping. This is not only my country's first, but also the world's first commercial 1,000-kilovolt transmission line, marking an international lead in the protection equipment that we apply to the world's highest voltage level。
As the grid enters an era of great interconnection, its scale and complexity are unique globally. This is a “no-man's land” and there is no precedent to follow。
“the increasing level, size and complexity of the electricity grid, which is characterized by the multiplication of electrical currents in the distribution of electrical power, the large decline in the value of the malfunctioning temporary electrical current, is highly likely to cause accidental or slow movement of protective equipment, resulting in grid accidents and damage to equipment, and serious challenges to the safe and stable operation of the grid.” zheng yuping said。
In the face of these difficulties, the team zheng yuping has tried repeatedly and has repeatedly overturned the re-emergence. Finally, they created a system of differential protection technologies adapted to the evolution of the temporary characteristics of complex grid failure, breaking through key core technologies for electrical transmission lines, high-capacity transformers, generators, main lines, etc。
These technical results were applied to major projects such as the first ultra-high voltage transmission project, the mercantilization network and the offshore wind power project, which significantly improved the ability to detect failures, reduced the time and improved the reliability of operations。
New exploration of technology under starfire new power
In recent years, there have been major power outages abroad, and zheng yuping has followed them with great vigilance. “the reason for the power outage is mainly the lack of a systematic defence doctrine and the inadequacy of the technology and equipment available to countries in the context of the accelerated development of new sources of energy.” zheng yuping's analysis。
As the construction of new electricity systems accelerates, the share of new energy sources rises significantly, large amounts of electrical and electronic equipment are connected, leading to profound changes in network failure patterns, undermining the theoretical basis of traditional relay protection based on the characteristics of synchronized machines, and existing relay protection faces the challenge of “unadapted”. If it is not updated in a timely manner, it will jeopardize the safe operation of the electricity grid。
Zheng yuping has proposed new principles for relay protection of time-area equivalence models, has initially constructed a new technological system of relay protection that does not depend on the characteristics of the power supply and has developed devices that are currently being used in scenarios such as wind discharges at sea, low-frequency transmissions and large new energy bases。
Demolition resistance to transformers has been a worldwide challenge, and existing relay protection technologies cannot be effectively addressed. The zheng yuping team proposed an innovative approach to multidisciplinary integration of “active protection”, which sought to complete the failure identification prior to the failure and to take multi-level warning and action measures to effectively prevent the explosion of fire inside the transformer。
“this hard bone, if chewed down, would not only significantly reduce safety risks to the grid, but would also save huge equipment costs for our country.” zheng yuping said。
From the age of 19, when he entered the field of electricity research, he has now become the chief scientist of the national electricity grid. For 40 years, zheng yuping has integrated his personal aspirations into the national energy security business and has been making breakthroughs in the technical area of electricity protection, making the road to the safety of the electricity grid a wider one。
