Selection method of wind and heat ratio at the sending end of wind power sent out using DC island mode
A DC islanding and sending-end technology, applied in the field of power transmission, can solve the problems of increasing the cost of conventional power, unable to cope with wind farm fluctuations, and reducing the reliability of the sending-end system.
Active Publication Date: 2018-07-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
At present, there are no specific and reliable measures for the configuration of conventional power sources in the sending-end system. If the ratio of conventional power sources is too high, the cost of building conventional power sources near the wind power base will be increased; if the ratio of conventional power sources is too small, it will Reduce the reliability of the sending end system and cannot cope with large wind farm fluctuations
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[0035] The present invention introduces reliability factor α ε The specific implementation method is as follows:
[0036] ①Reliability factor α ε calculation;
[0037] reliability factor α ε It is necessary to refer to the annual output probability density curve of the wind farm. reliability factor α ε It refers to the difference between the maximum value and the minimum value (per unit value) of the output of the wind farm base whose annual output of the wind farm base meets a certain probability ε.
[0038]
[0039] F(P wind min ≤P wind ≤P wind max ) = ε (10)
[0040] In the formula: P windmax ,P windmin The maximum and minimum output values of wind farm bases that meet the conditions; P wind.N Indicates the installed capacity of wind turbines; ε indicates that in the wind farm output probability density map, the wind farm output P wind at P windmax ,P windmin The probability between is ε.
[0041] ② Determine the thermal reserve capacity of the thermal p...
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The invention discloses a sending-end wind-thermal ratio selection method for delivering wind power by use of a DC island-mode. According to the method, first of all, a yearly output feature of a wind power plant base is estimated according to the typical daily wind speed of a wind power plant, and portability processing is performed on wind power plant output data within one year; and then a realizable factor alpha epsilon and a minimum output factor beta of a thermal power set are introduced, a hot standby capacity of the thermal power set is determined according to the reliable factor, an assembling capacity of the thermal power set is calculated according to the minimum output factor, a wind-thermal ratio K is determined, and at the same time, rapid adjustment of a DC system is taken as a supplement of the ratio selection. According to the invention, the ratio is selected according to the reliability of a portability sending-end system of wind power plant output and the reliability is quite high, and therefore, the method is a feasible method for selecting wind-thermal ratio of the wind power plant. The ratio selection method brought forward by the invention can reduce investment of a thermal power plant, improve the utilization efficiency of wind power and reduces electricity price especially under the condition that the wind power plant base is far away from a coal-power base and the coal transport cost is quite high. Finally, simulation is carried out by taking a certain wind power plant as an example, and effectiveness of the provided method is verified.
Description
technical field [0001] The invention mainly aims at the problem of selecting the ratio of wind and heat when the wind farm and the thermal power plant at the sending end are in an island state and adopt direct current to transmit electric energy, and belongs to the technical field of power transmission. Background technique [0002] DC transmission is an important means to solve high-voltage, large-capacity, long-distance power transmission and grid interconnection in power countries in the world. In recent years, with the construction of large-scale wind power bases, the way of sending wind power through direct current transmission has been widely recognized. The large-capacity DC transmission system adopts the isolated island operation mode at the sending end. The isolated island refers to a relatively independent and precise small system that has no direct electrical connection with the large AC system at the sending end. After the DC is blocked, the energy inside the isl...
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IPC IPC(8): H02J3/46
CPCH02J3/46Y02E10/76
Inventor 梁海峰于立杰曹大卫李怀科
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)