A method for arranging DC power in an external transmission system of a wind power base

Abstract

The invention provides a direct-current power arrangement method applied to a wind electricity base outward-transmitting system. According to the method, factors such as wind electricity power fluctuation, the adjustment ability and adjustment cost of a direct-current sending and receiving end power grid, the requirement of a direct-current receiving end power grid for direct-current power transmission, and the hours of direct current utilization are considered; direct-current power arrangement considering a plurality of factors in the wind electricity base outward-transmitting system is provided; and provided direct-current power is practically feasible and reasonable.

Description

technical field [0001] The invention relates to a method in the field of electric power system automation, in particular to a method for arranging DC power in consideration of multiple factors in a wind power base transmission system. Background technique [0002] People's application and understanding of electric energy first started from DC. In 1882, French physicist and electrical technician M. Deplee sent the electric energy generated by the 3-horsepower DC generator installed in the Miesbach coal mine to Munich, 57 kilometers away, with a DC voltage of 1500-2000 volts. At the International Exposition, the first power transmission test was completed. Since then, in the early 20th century, the voltage, power and distance of experimental direct current transmission reached 125 kV, 20 MW and 225 kilometers respectively. However, since DC generators are used in series to obtain high-voltage DC power supply, the motor at the receiving end is also operated in series. Not onl...

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Problems solved by technology

[0004] At present, the power arrangement of the DC projects that have been completed and put into operation in China is generally arranged according to the two-stage power curve or constant power. This method is suitable for conventional power sources with relatively stable power transmission. In the case of wind power, since wind power is generally distributed in remote areas far away from the load center, the regional power grid where it is located has limited accommodation capacity, and it is generally necessary to transmit wind power to the load center area through direct current. , therefore, when the scale of wind power is large, the power grid at the sending end often has insufficient regulation capacity, which will cause large-scale wind curtailment and cause economic losses, which is not conducive to the consumption of wind power

Generally, the power grid in the load center area has a large scale, and the load center area and the wind power sending end grid have certain complementary adjustment characteristics, such as seasonal differences, load characteristics differences, and power supply structure differences. The existing conventional DC power arrangement method is not conducive to Making full use of the complementary adjustment characteristics of the DC sending and receiving end grid is not conducive to improving the capacity of wind power consumption. In the case of large-scale development of wind power in the future, the conventional DC power arrangement method in the existing technology can no longer meet the requirements of grid development.

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