In the past five years, China’s wind power has developed rapidly, and its installed capacity has grown at a rate almost doubling. This is a process from quantitative change to qualitative change. Wind power grid integration problems broke out in the first half of this year. The large-scale wind turbine grid off-grid accidents in Jiuquan and other regions continued to occur in the operating areas of the State Grid Corporation, causing certain problems in the safe operation of the grid and reliable Power Supply. Affected, fundamentally strengthening the topic of wind power grid-connected management to advance debut.
On July 7th, the State Grid Corporation of China held the "Strengthening Wind Power Integration Management Symposium" in Beijing. This is the second time the State Grid has held the same theme conference this year. The participants included the National Energy Administration, the State Electricity Regulatory Commission, the Research Office of the State Council, the State Grid Corporation of China, all wind power grid-connected departments, major power generation groups, and domestic mainstream wind turbines. The purpose of the meeting was to analyze and summarize the wind power grid connection problems that had occurred, and to strengthen management in the form of intensive measures, regulations, and regulations.
The follow-up measures to the large-scale fan off-grid meeting first elaborated on the follow-up measures of the three large-scale fan off-grid accidents.
The National Energy Administration, the State Electricity Regulatory Commission, and the State Grid Corporation of China believe that the main cause of the off-grid accident is that there are major problems in the wind turbine performance, wind farm reactive power control strategy, secondary system configuration, and wind farm operation and management. . The Northwest State Grid Corporation of China, North China Company and Gansu Company carried out rectification of the accidental wind farms. According to the clear technical principles in the review opinions of the access system, the low-voltage ride-through capability, dynamic reactive power compensation device and power quality of the wind turbines do not meet the system operation requirements. The wind farm has formulated a plan for rectification. Only after the rectification is completed can the grid be reconnected.
The State Grid Corporation of China also compiled the "Key Points for Anti-accident Measures for Wind Power Grid Operation" and "Typical Design of Wind Farm Electrical System". At the same time, starting in April 2011, the State Grid has established a working mechanism for the internal consultation of wind power development and holds monthly conferences.
Problems in the development of wind power Shu Yinhao, deputy general manager of State Grid Corporation of China, believes that the contradiction revealed in the development of wind power in China is not a certain issue. He summarized five points.
First of all, the technical standards for wind power grid integration are missing and legislation is lagging behind. Wind power grid-connected technology standards include wind farm access, grid-connected inspection and dispatch operation. At present, only some countries and industry standards are working, and the standard system is still not perfect.
In terms of access, the national standard “Technical Regulations on Wind Farm Access to Power Systems†and the industry standard “Technical Specifications for Large Wind Farm Grid Connection Design†have not been approved.
In the aspect of grid-connected testing, the industry standard “Test Protocol for Low-voltage Traverse Capacity of Wind Turbine†has just completed the consultation draft.
In terms of dispatching operations, the industry standard Wind Farm Dispatching Operation Management Specification and Wind Power Forecasting Functional Specification have not yet completed professional review.
Second, the performance of wind turbines needs further improvement. According to the State Grid Corporation of China, the wind turbines that have been put into operation in China have basically no qualified fault ride-through capability, poor active power regulation performance, insufficient reactive power regulation capability, and poor equipment quality.
Third, the management of wind farm construction and operation needs to be improved. The repetitive occurrence of similar accidents in wind farms highlights that there is a large gap between wind power in design, construction, supervision, commissioning and operation and other aspects of conventional power supply.
Fourth, the management of wind power dispatch and operation needs to be strengthened. In terms of wind farm power forecasting, China currently only conducts wind power forecasting on the grid side, and more than 90% of wind farms have not yet established a forecasting system; in terms of wind farm monitoring systems, there are non-uniform standards, non-standard interfaces, and incomplete functions. Problems such as: In terms of fan network protection, it is difficult to match the protection settings with the system electrical protection, and the fault can not be correctly operated as required. In addition, the reactive power compensation in the wind farm and the connection of some wind farms are not reasonable.
Finally, wind power development requires overall planning. According to the State Grid Corporation of China, there is a lack of unified planning for wind power development in China, and the planning of enterprises, local governments and the country is out of step; wind farm construction is inconsistent with power grid planning, and there is a phenomenon of “first nuclear wind and nuclear nuclear networkâ€; wind power planning and flexibility The power supply planning was not coordinated, and there was a serious lack of flexible power conditioning.
Unprecedented wind power grid-connected management In terms of strengthening wind power grid-connected management measures, Shu Yinzhe specifically emphasized “regulations in accordance with laws and regulations,†because of the intensive introduction of grid-connected management policies to the National Energy Administration, the State Electricity Regulatory Commission, and other government agencies. For the majority of publishers, it changed the form of "enterprise management enterprise" which was mainly issued by the State Grid Corporation of China. On-grid management involves nine aspects.
Measures at the government level include strengthening the unified planning of wind power development and improving the grid-connected technology standard system. The former called for re-establishing the authority of the national wind power plan. Liang Zhipeng, deputy director of the New Energy and Renewable Energy Division of the National Energy Administration, said: “In the past, most wind power projects were approved by local governments and there was a phenomenon of dismantling wind farms, causing wind power. The construction and market consumption and transmission planning are not synchronized, and the wind power supply is not coordinated with other peaking and frequency modulation power supplies.The “Twelfth Five-Year Plan†to be issued will include the “Thematic Plan for Wind Powerâ€. In the future, the wind power planning of all departments should be strictly unified. The latter is in the context of grid-connected technology standards, the national standard "Technical Regulations on Wind Farm Access to Power Systems," and the industry standard "Technical Code for Large Wind Farm Grid-connected Designs" have been reviewed and will be introduced soon.
The management measures at the enterprise level involve complete machine manufacturing, wind farms and power grids in the wind power industry chain.
On the side of complete machine manufacturing and wind farms, public opinion about long-term wind power reshuffle may take substantial steps. Fans that do not meet grid connection requirements will only be eliminated, and grid-friendly wind farms will no longer be enterprises. High standards of publicity. Wind turbine fault ride-through capability, active and reactive power regulation capability, main control system and performance of key components of the converter have become the bottom of the grid connection.
The Interim Measures for the Inspection and Administration of Wind Turbine Grid Connections stipulates that: For wind power projects approved after January 1, 2011, the grid-connected generators must pass the grid-connected inspection; the wind turbines that have been put into production must be evaluated and do not meet the requirements of the grid-connected technology. Opinions shall be put forward for rectification, and reconstruction shall be completed within one year. Wind turbines and wind farms that have not completed the transformation shall not be connected to the grid; within six months after the grid connection, the grid-connected inspection shall be completed and the inspection report shall be submitted to the dispatching agency for review. It is the forthcoming National Wind Power Testing Center that will undertake this task.
On the grid side. The grid company will strictly follow the requirements of the Interim Measures for Management of Wind Power Forecasting and Forecasting to implement wind farm power forecasting. On-grid wind farms shall submit daily forecasts and real-time forecasts to the dispatching agencies within a specified time, and carry out power generation plan application. The criterion for assessing the wind farm power forecasting is that the error between the power generation plan and the actual output is less than 20%. The dispatch center will arrange the priority dispatching order according to the forecasting accuracy, and report the unqualified wind farm project to its head office. Shuyin Yin said: "In order to be fair and open, the above information will be published on the Internet every month."
In addition, the State Grid is about to launch a wind power information platform. The platform covers the entire information database of wind power planning, pre-construction, construction, grid connection, and operation. It also includes information on relevant policies, major research results, important conferences, and foreign wind power developments.
Shuyin Yin believes that the construction of power grids is related to the study of wind power consumptive market, and that accelerating the construction of UHV power grids can expand the range of wind power consumption.
On July 7th, the State Grid Corporation of China held the "Strengthening Wind Power Integration Management Symposium" in Beijing. This is the second time the State Grid has held the same theme conference this year. The participants included the National Energy Administration, the State Electricity Regulatory Commission, the Research Office of the State Council, the State Grid Corporation of China, all wind power grid-connected departments, major power generation groups, and domestic mainstream wind turbines. The purpose of the meeting was to analyze and summarize the wind power grid connection problems that had occurred, and to strengthen management in the form of intensive measures, regulations, and regulations.
The follow-up measures to the large-scale fan off-grid meeting first elaborated on the follow-up measures of the three large-scale fan off-grid accidents.
The National Energy Administration, the State Electricity Regulatory Commission, and the State Grid Corporation of China believe that the main cause of the off-grid accident is that there are major problems in the wind turbine performance, wind farm reactive power control strategy, secondary system configuration, and wind farm operation and management. . The Northwest State Grid Corporation of China, North China Company and Gansu Company carried out rectification of the accidental wind farms. According to the clear technical principles in the review opinions of the access system, the low-voltage ride-through capability, dynamic reactive power compensation device and power quality of the wind turbines do not meet the system operation requirements. The wind farm has formulated a plan for rectification. Only after the rectification is completed can the grid be reconnected.
The State Grid Corporation of China also compiled the "Key Points for Anti-accident Measures for Wind Power Grid Operation" and "Typical Design of Wind Farm Electrical System". At the same time, starting in April 2011, the State Grid has established a working mechanism for the internal consultation of wind power development and holds monthly conferences.
Problems in the development of wind power Shu Yinhao, deputy general manager of State Grid Corporation of China, believes that the contradiction revealed in the development of wind power in China is not a certain issue. He summarized five points.
First of all, the technical standards for wind power grid integration are missing and legislation is lagging behind. Wind power grid-connected technology standards include wind farm access, grid-connected inspection and dispatch operation. At present, only some countries and industry standards are working, and the standard system is still not perfect.
In terms of access, the national standard “Technical Regulations on Wind Farm Access to Power Systems†and the industry standard “Technical Specifications for Large Wind Farm Grid Connection Design†have not been approved.
In the aspect of grid-connected testing, the industry standard “Test Protocol for Low-voltage Traverse Capacity of Wind Turbine†has just completed the consultation draft.
In terms of dispatching operations, the industry standard Wind Farm Dispatching Operation Management Specification and Wind Power Forecasting Functional Specification have not yet completed professional review.
Second, the performance of wind turbines needs further improvement. According to the State Grid Corporation of China, the wind turbines that have been put into operation in China have basically no qualified fault ride-through capability, poor active power regulation performance, insufficient reactive power regulation capability, and poor equipment quality.
Third, the management of wind farm construction and operation needs to be improved. The repetitive occurrence of similar accidents in wind farms highlights that there is a large gap between wind power in design, construction, supervision, commissioning and operation and other aspects of conventional power supply.
Fourth, the management of wind power dispatch and operation needs to be strengthened. In terms of wind farm power forecasting, China currently only conducts wind power forecasting on the grid side, and more than 90% of wind farms have not yet established a forecasting system; in terms of wind farm monitoring systems, there are non-uniform standards, non-standard interfaces, and incomplete functions. Problems such as: In terms of fan network protection, it is difficult to match the protection settings with the system electrical protection, and the fault can not be correctly operated as required. In addition, the reactive power compensation in the wind farm and the connection of some wind farms are not reasonable.
Finally, wind power development requires overall planning. According to the State Grid Corporation of China, there is a lack of unified planning for wind power development in China, and the planning of enterprises, local governments and the country is out of step; wind farm construction is inconsistent with power grid planning, and there is a phenomenon of “first nuclear wind and nuclear nuclear networkâ€; wind power planning and flexibility The power supply planning was not coordinated, and there was a serious lack of flexible power conditioning.
Unprecedented wind power grid-connected management In terms of strengthening wind power grid-connected management measures, Shu Yinzhe specifically emphasized “regulations in accordance with laws and regulations,†because of the intensive introduction of grid-connected management policies to the National Energy Administration, the State Electricity Regulatory Commission, and other government agencies. For the majority of publishers, it changed the form of "enterprise management enterprise" which was mainly issued by the State Grid Corporation of China. On-grid management involves nine aspects.
Measures at the government level include strengthening the unified planning of wind power development and improving the grid-connected technology standard system. The former called for re-establishing the authority of the national wind power plan. Liang Zhipeng, deputy director of the New Energy and Renewable Energy Division of the National Energy Administration, said: “In the past, most wind power projects were approved by local governments and there was a phenomenon of dismantling wind farms, causing wind power. The construction and market consumption and transmission planning are not synchronized, and the wind power supply is not coordinated with other peaking and frequency modulation power supplies.The “Twelfth Five-Year Plan†to be issued will include the “Thematic Plan for Wind Powerâ€. In the future, the wind power planning of all departments should be strictly unified. The latter is in the context of grid-connected technology standards, the national standard "Technical Regulations on Wind Farm Access to Power Systems," and the industry standard "Technical Code for Large Wind Farm Grid-connected Designs" have been reviewed and will be introduced soon.
The management measures at the enterprise level involve complete machine manufacturing, wind farms and power grids in the wind power industry chain.
On the side of complete machine manufacturing and wind farms, public opinion about long-term wind power reshuffle may take substantial steps. Fans that do not meet grid connection requirements will only be eliminated, and grid-friendly wind farms will no longer be enterprises. High standards of publicity. Wind turbine fault ride-through capability, active and reactive power regulation capability, main control system and performance of key components of the converter have become the bottom of the grid connection.
The Interim Measures for the Inspection and Administration of Wind Turbine Grid Connections stipulates that: For wind power projects approved after January 1, 2011, the grid-connected generators must pass the grid-connected inspection; the wind turbines that have been put into production must be evaluated and do not meet the requirements of the grid-connected technology. Opinions shall be put forward for rectification, and reconstruction shall be completed within one year. Wind turbines and wind farms that have not completed the transformation shall not be connected to the grid; within six months after the grid connection, the grid-connected inspection shall be completed and the inspection report shall be submitted to the dispatching agency for review. It is the forthcoming National Wind Power Testing Center that will undertake this task.
On the grid side. The grid company will strictly follow the requirements of the Interim Measures for Management of Wind Power Forecasting and Forecasting to implement wind farm power forecasting. On-grid wind farms shall submit daily forecasts and real-time forecasts to the dispatching agencies within a specified time, and carry out power generation plan application. The criterion for assessing the wind farm power forecasting is that the error between the power generation plan and the actual output is less than 20%. The dispatch center will arrange the priority dispatching order according to the forecasting accuracy, and report the unqualified wind farm project to its head office. Shuyin Yin said: "In order to be fair and open, the above information will be published on the Internet every month."
In addition, the State Grid is about to launch a wind power information platform. The platform covers the entire information database of wind power planning, pre-construction, construction, grid connection, and operation. It also includes information on relevant policies, major research results, important conferences, and foreign wind power developments.
Shuyin Yin believes that the construction of power grids is related to the study of wind power consumptive market, and that accelerating the construction of UHV power grids can expand the range of wind power consumption.
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