On August 5, the National Energy Administration meeting approved and issued 18 important standards such as the “Technical Code for Design of Large Wind Farm Grid Connectionsâ€. At the same time, the SERC’s national wind power safety inspection focused on “low voltage ride through†also started in August. After five years of “freeway†maniac, China Wind Power finally ushered in the latecomer to the national standard.
After tens of thousands of fans were installed and several major wind turbines were disconnected from the grid, the wind power industry in China was called the "National Standard for Wind Power Grid-connected Technologies" and finally came to the surface.
According to news from the National Energy Administration, the second session of the second session of the Wind Power Standards Technical Committee of the energy industry and the wind power standardization work conference of the energy industry was held in Beijing on August 5th. The meeting examined and issued the “Technical Code for Design of Large Wind Farm Grid Connections†18 The important criteria. At the same time, the SERC’s national wind safety inspection, which mainly focused on the “detection and modification of low-voltage ride-through capability of wind farm units and the impact on the local power grid after the wind farm was connected to the system,†was also launched in August.
As for the Chinese wind power that has been on the "highway" for five years, this "national standard" seems to be a bit late. The consequent transformation costs and upgrade costs have become the focus of debate.
Sword refers to the network bottleneck After China's wind power experienced a brief “ebbing,†a series of actions focused on wind power began, especially the promulgation of the new national standard and the start of security inspections, and the goal was to point out the difficulties in the development of wind power in China.
The industry generally believes that the national standards for the wind power industry have been intensively introduced since the beginning of this year, and the number of wind power off-grid accidents notified by the China Electricity Regulatory Commission has started.
The “State of Wind Power Safety and Supervision Practices in the Northwest Region†issued by the State Electricity Regulatory Commission on July 18 pointed directly to the “low-voltage ride-through capability†of operating units. According to the relevant report of the China Electricity Regulatory Commission, only the failure of power equipment occurred in various wind farms in Jiuquan Region in the first half of this year reached 35 times, of which, 21 sets of circuit breaker trips caused by cable head faults, and 5 trips caused by protection plug-in faults caused by device tripping or switching. , 9 other faults. Among the above failures, there were 4 accidents that caused massive off-grid networks.
According to the accident report of the SERC, in the above accidents, the lack of low-voltage ride-through capability was the root cause. The frequent occurrence of wind power off-grid accidents has strengthened the country’s determination to implement wind turbine low-voltage ride-through transformation.
Low-voltage traversing refers to that when a grid fault or disturbance causes the voltage at the grid-connected point of the wind farm to fall, the wind turbine can be continuously connected to the grid within a certain range of voltage drop until the voltage recovers as usual, thereby maintaining the stability of the grid. Having low-voltage traversing capability can ensure that the wind turbine can connect to the grid as much as possible when the grid fault voltage is reduced, maintain the ability to generate power, and reduce grid fluctuations.
The current situation of domestic low-voltage wind turbine evacuation technology has caused owners to worry. Wang Ningyi, director of the Wind Power Center of the Gansu Provincial Power Company, said in an interview with the Scientific Times reporter: “At present, wind turbines in wind farms in China are generally not capable of low-voltage ride-through.â€
According to reports, the bidding for wind power equipment at Jiuquan Wind Power Base was completed in 2008. At that time, the domestic technical requirements for low voltage ride through were not yet clear.
In fact, as early as in 2009, the State Grid Corporation of China has already issued the “Technical Regulations on the Integration of Wind Farms into Power Grids,†which explicitly requires that the wind farm voltage drop to 20% of the rated voltage for a duration of no more than 625 milliseconds and within 2 seconds. In the range of 90% of rated voltage, the wind farm is not allowed to escape the net, and wind farms beyond this range are allowed to escape the net.
However, this corporate standard is not binding on wind turbine manufacturers. Most fans do not have this function after shipment.
The statistics from the Institute of New Energy of the Chinese Academy of Electric Power (300215) show that there are currently only six models of six companies that have passed the low-voltage crossing capability test and power characteristics test in the hospital, and two of them are Foreign companies. Only 1.5 megawatt wind turbines in a few domestic companies passed this test.
“With the trend of large-scale wind turbines and the opening of the offshore wind power market, low-voltage traversing tests have become the major technical bottleneck restricting the large-scale grid connection of multi-megawatt wind turbines,†said Wang Weisheng, director of the New Energy Research Institute of the Chinese Academy of Electric Power. .
After tens of thousands of fans were installed and several major wind turbines were disconnected from the grid, the wind power industry in China was called the "National Standard for Wind Power Grid-connected Technologies" and finally came to the surface.
According to news from the National Energy Administration, the second session of the second session of the Wind Power Standards Technical Committee of the energy industry and the wind power standardization work conference of the energy industry was held in Beijing on August 5th. The meeting examined and issued the “Technical Code for Design of Large Wind Farm Grid Connections†18 The important criteria. At the same time, the SERC’s national wind safety inspection, which mainly focused on the “detection and modification of low-voltage ride-through capability of wind farm units and the impact on the local power grid after the wind farm was connected to the system,†was also launched in August.
As for the Chinese wind power that has been on the "highway" for five years, this "national standard" seems to be a bit late. The consequent transformation costs and upgrade costs have become the focus of debate.
Sword refers to the network bottleneck After China's wind power experienced a brief “ebbing,†a series of actions focused on wind power began, especially the promulgation of the new national standard and the start of security inspections, and the goal was to point out the difficulties in the development of wind power in China.
The industry generally believes that the national standards for the wind power industry have been intensively introduced since the beginning of this year, and the number of wind power off-grid accidents notified by the China Electricity Regulatory Commission has started.
The “State of Wind Power Safety and Supervision Practices in the Northwest Region†issued by the State Electricity Regulatory Commission on July 18 pointed directly to the “low-voltage ride-through capability†of operating units. According to the relevant report of the China Electricity Regulatory Commission, only the failure of power equipment occurred in various wind farms in Jiuquan Region in the first half of this year reached 35 times, of which, 21 sets of circuit breaker trips caused by cable head faults, and 5 trips caused by protection plug-in faults caused by device tripping or switching. , 9 other faults. Among the above failures, there were 4 accidents that caused massive off-grid networks.
According to the accident report of the SERC, in the above accidents, the lack of low-voltage ride-through capability was the root cause. The frequent occurrence of wind power off-grid accidents has strengthened the country’s determination to implement wind turbine low-voltage ride-through transformation.
Low-voltage traversing refers to that when a grid fault or disturbance causes the voltage at the grid-connected point of the wind farm to fall, the wind turbine can be continuously connected to the grid within a certain range of voltage drop until the voltage recovers as usual, thereby maintaining the stability of the grid. Having low-voltage traversing capability can ensure that the wind turbine can connect to the grid as much as possible when the grid fault voltage is reduced, maintain the ability to generate power, and reduce grid fluctuations.
The current situation of domestic low-voltage wind turbine evacuation technology has caused owners to worry. Wang Ningyi, director of the Wind Power Center of the Gansu Provincial Power Company, said in an interview with the Scientific Times reporter: “At present, wind turbines in wind farms in China are generally not capable of low-voltage ride-through.â€
According to reports, the bidding for wind power equipment at Jiuquan Wind Power Base was completed in 2008. At that time, the domestic technical requirements for low voltage ride through were not yet clear.
In fact, as early as in 2009, the State Grid Corporation of China has already issued the “Technical Regulations on the Integration of Wind Farms into Power Grids,†which explicitly requires that the wind farm voltage drop to 20% of the rated voltage for a duration of no more than 625 milliseconds and within 2 seconds. In the range of 90% of rated voltage, the wind farm is not allowed to escape the net, and wind farms beyond this range are allowed to escape the net.
However, this corporate standard is not binding on wind turbine manufacturers. Most fans do not have this function after shipment.
The statistics from the Institute of New Energy of the Chinese Academy of Electric Power (300215) show that there are currently only six models of six companies that have passed the low-voltage crossing capability test and power characteristics test in the hospital, and two of them are Foreign companies. Only 1.5 megawatt wind turbines in a few domestic companies passed this test.
“With the trend of large-scale wind turbines and the opening of the offshore wind power market, low-voltage traversing tests have become the major technical bottleneck restricting the large-scale grid connection of multi-megawatt wind turbines,†said Wang Weisheng, director of the New Energy Research Institute of the Chinese Academy of Electric Power. .
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