How to solve the problem of wind power grid-Hummer wind turbine

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How to solve the problem of wind power grid

wind generators is an extremely unstable resources, to make wind power grid network and to ensure good operation of the conditions required very high. This includes the power grid construction planning, accurate wind forecasts, at a time when no wind power reserve should be sufficient resources, benign electricity market supply and demand balance of buyers and sellers, but consumers must also be optimistic about the power of wind power. In this regard, Denmark, made an early start, technology is relatively mature, there are many experiences we should learn from.

At present, wind turbines accounted for the Danish electricity supply about 20%. In Denmark, there are nearly 5,200 wind turbines with a total installed capacity of more than 3100 MW. If the wind speed reached 10 m / s, these fans made electricity to meet peak periods of all families of Denmark¡¯s electricity consumption. Denmark has become the world leader in wind power industry, and its secret of success lies in a sound system and complete condition.

Network planning and construction

Denmark as early as 1981, on the development of the first energy plan, by the year 2000 of about 900 megawatts of wind power installed capacity to meet the 10% of the electricity demand. As the government support, subsidies, the target ahead of schedule in 1997.

In 1984, first appeared in Denmark, is valid for 10 years, from fan manufacturers, wind developers and power companies signed three "voluntary agreement." Under the agreement, not only to purchase wind power, while providing convenience for the grid, in addition to power sales price by 85% of the acquisition of wind power. In 1992, the Government of the agreement in legal form to be fixed.

In 2003, Denmark also proposed in 2030 the total wind power generating capacity of 50% target, adding a significant portion will come from offshore wind power. Held in Copenhagen, Denmark in 2005 the decision-making seminar identified the development of offshore wind power barriers focused on the various functional departments to solve the feasibility, methods and structure of the co-operation.

Wind power needs a strong support network, a strong lookout electricity from the power grid can be sent to a place where most needed electricity. State Grid Corporation of Denmark every year to spend hundreds of millions of crowns for the expansion and strengthening of the Danish power grid construction and with the other link between the national grid. Upon completion of each specific project, will be a strong advance planning, such as assessment of the location of wind farms, as well as estimates of the laying of the new power grid and so on.

In the planning and construction of power grid, the Danish special attention to cooperation with neighboring countries. When Denmark¡¯s wind power generation capacity beyond its electricity needs, the excess power on the transmission to Norway and Sweden, in order to help these two countries to save the water resources for power generation. And when no wind, when the territory is located in Norway and Sweden, the hydropower station began operation, the power delivered to Denmark. Of course, to achieve this power to send each other the strength of the grid has very high demand. Nordic electricity market can now achieve this power transmission.

Currently, in order to better develop wind power, the European countries are actively cooperating to strengthen cross-border power grids. The European wind power study (EWIS) project covers all of the four power systems in Europe (TSO) - Continental Europe interconnected power grids, the UK power grid, Ireland and the Nordic power grid. 13 countries from the European Union¡¯s 15 transmission operators form a team, jointly responsible for the study. This is the first time from four European countries in the region work together to build the future European electricity supply.

To develop technical standards for grid

Denmark in the 20th century, 80 years issued the first one on the power grid guidelines, time, wind power is also considered to be a marginal, non-mainstream¡¯s electricity needs. Fans are mostly small-capacity unit, or in the same point and the network of a small number of fans. The guidelines of the birth of the grid in response to the safe operation of distribution networks, therefore, time, and network implementation of the guideline of the fan control functions, and not request that only require the fan to run out, when necessary, until the power returned to normal The voltage and current state of the grid again.

This situation continued until 1997 published the Danish offshore wind farm construction plan before starting to change. According to the plan, Denmark in 20 years to build an installed capacity of 150 MW offshore wind farm, and then access to voltage levels above 100 kV grid. Danish State Grid Corporation realized, in which case the fan capacity needed better control. They set up a team dedicated to developing guidelines for power grid, and in 1999 published the first proposed control functions for fan power requirements and network guidelines.

At the same time, land-based wind farm installed capacity has also led to increased access to low-voltage power grid for wind farm grid guidelines for the development of guidelines for these fans made a similar request. As in many areas, often greater than the electricity generating capacity, distribution network where the amount of wind power is much higher than the load power consumption, therefore, into the low-voltage power grid fan control function becomes very important.

Overall, Danish wind power guidelines, experienced from the early regardless of voltage level of a requirement to develop into more than 100 kV and 100 kV voltage level and the network of the following two technical requirements. At present, almost all small wind generators into the distribution network, for example, 20 kV or lower voltage distribution network. For general access to large land-based fan voltage is 30 kV -60 kV power grid. Only large-scale offshore wind farm will be directly incorporated into the 132 kV -150 kV transmission network.