Wind power grid connection technology is basic to solve the inspection progress
Recently, the wind power testing information released by the National Wind Power Technology and Detection Research Center shows that, as of the end of June this year, wind power companies have completed 219 wind farms with low-voltage traversing capacity transformation, accounting for 89% of the need to transform wind farms, and completed 151 wind farms. The low voltage through sampling, accounting for 69% of the wind farms with test conditions.
Liu Chun, deputy director of the New Energy Research Institute of the Chinese Academy of Electric Power, said in an interview with the reporter that through the analysis of the testing process and results, the public’s attention to grid connection difficulties is mainly attributed to four major types of problems in the technology, after the fan. The joint efforts of complete manufacturers, component manufacturers, and wind farm developers have been gradually resolved.
No large-scale off-grid accident occurred this year
Normal low-voltage ride-through tests require that the test voltage drop 40 times. In fact, many manufacturers have conducted more than 200 repeated tests to identify problems and improve technical solutions until they are adopted. Liu Chun said that 80% of the testing workload is for the development of wind turbine manufacturers. Through the analysis of the detection process and results, four typical problems have become the crux of the difficulties in grid integration of wind power, including inappropriate settings of protection parameters for wind farms and wind turbines, control strategy defects, improper maintenance, and other reasons. The data shows that the control strategy defects and improper parameter settings are the main reasons in the wind turbine test. The main reasons are the improper maintenance and control strategy defects in the low-voltage traverse sampling inspection of wind farms.
The improper setting of parameters, for example, caused the phenomenon of the specific causes of the main control system setting is not properly set, box variable protection settings are not properly set of six, through the test can be calculated for each cause of the probability of occurrence. Through the analysis of fault phenomena and repeated tests, the effective solution was informed to the company and re-measured after correction. Liu Chun said.
Liu Chun told reporters that the above four typical technical problems have been gradually resolved. The wind power grid connection performance and wind power operation quality have been continuously improved, and large-scale wind power off-grid accidents have decreased from 8 in 2011 to 1 in 2012. No large-scale off-grid accidents have occurred this year.
Inspection progresses in an orderly manner
The test data shows that the rate of one-time sampling inspection of wind farms is only 60%, and after several times of transformation, the ratio of inspections passed is 38%, and the final failed rate is 2%.
During the inspection process, we discovered some rules. For example, some wind turbine manufacturers with independent core technologies have certain advantages and can quickly pass tests or assessments. Liu Chung explained to reporters that the wind turbine model established by domestic wind power technology equipment R&D and manufacturing company Goldwind Technology has high accuracy, and adopts the consistency assessment method to evaluate the low-voltage ride-through performance of wind turbines. It is much faster than other companies.
In addition, some wind power companies have increased investment, taken measures to strengthen the ability to ex-factory testing, established specialized wind power test and detection teams, and deployed on-site testing equipment to cooperate with inspections, effectively shortening inspection time and achieving good results. . For example, companies such as Goldwind, Dongqi, and Sinovel have established a full-power test platform and test environment for wind turbines, which can simulate some of the characteristics of wind turbines and help them pass inspections. Liu Chun said.
According to Wang Yimin, director of the Ministry of Science and Technology of the State Grid Corporation of China, at present, the low-voltage through-sampling inspection of wind farms in the national grid region is nearing completion and is expected to be completed within the year. In addition, wind power unit power quality inspection, active / reactive power control capabilities and other work is also in an orderly manner.
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