Jul 30 , 2013
In June this year, the newly revised national standard – Technical Rule for Connecting Wind Farm to Power Network (GB/T19963-2011) is formally implemented, in place of the old standard GB/Z19963-2005, which specifies the general technical conditions for connecting wind farm to the grid. Qin Shiyao, deputy director of new energy institute of EPRI, said that, one of the highlights of the new standard is that, the detailed requirements are defined for low voltage ride through of wind farms, which is an important factor to measure grid-connected wind power quality.
According to reports, the low voltage ride through means that the wind turbines operate continuously without off-grid when the voltage at the grid-connected point drops due to grid failure; in case of the power system failure, it can be cut out from the grid, thereby enhancing grid security and stability. The investigation of the accidents previously occurred in China shows that, one of the main reasons causing large-scale off-grid wind power is that some of the operating wind turbines being connected to the grid do not have low voltage ride through capability, and the dynamic reactive support cannot be effectively provided during the fault.
The ultimate purpose of the wind power development is grid-connected power generation. However, different power sources could supply better or worse electricity, so the grid security will be seriously affected if the wind power quality is below the standard. In recent years, in order to prevent the unqualified wind power from connecting to the power system, a series of related standards have been promulgated and implemented. State General Administration of Quality Supervision, Inspection and Quarantine and the National Standards Commission issued a series of national standards related to wind power to regulate the design, production, installation, test and inspection and networking of wind turbines; National Energy Administration released 18 wind power standards for energy industry to regulate some technical issues about wind power; in addition, the State Grid Corporation has also developed and promulgated more enterprise standards for wind power to regulate wind power integration .
In the opinion of Qin Shiyao, the issue and implementation of standards involving wind power integration at all levels from national standards to the industry standards, and then to corporate standards, effectively solve such issues as no specification for construction of wind farms, no standards for connecting to the grid, cracking the grid integration bottleneck for wind power industry development to some extent.