【正文】 VR is rated wind speed. 3． Influence of wind power generation on power systems High peration of wind power in the power systems faces fundamental technical limits with regard to the integration of largescale wind farms to the grid. The influence of wind power generation on power systems includes active and reactive power flow, voltage, system stability, power quality, shortcircuit capacity, system reserve and infrastructure due to the characteristics of highcapacity, dynamic and stochastic performance of wind power generation. Technically, it influences the gird in the following ways and has to be studied in detail: （ 1） Active and Reactive Power Flow. Wind power is a kind of intermittent and stochastic power source, which will plicate the power flow. Because many wind farms are built far away from load centers in order to capture more wind energy, there is always some obstacle of transmitting wind power. Some transmission or distribution lines and other electrical equipments may be overloaded when the additional wind power generation is introduced. So it should be ensured that the interconnecting transmission or distribution lines will not be overloaded. Both active and reactive power requirements should be investigated. Reactive power should be generated not only at PCC, but also throughout the work, and should be pensated locally[6]. The methods utilized for analysis of conventional generators are certain and ignore the uncertainty of wind speed and load forecasts. Therefore, the probabilistic method is more suitable for wind power generation. This model is based on the wind speed distribution, such as formula (1). The constraints are described by probabilistic forms and the expected values of parameters, such as voltages and powers can be puted. （ 2） Voltage Regulation. 風(fēng)力發(fā)電對(duì)電力系統(tǒng)的影響 Once a wind farm has identified its site, the point at which connection to the grid must be identified. Small wind farm can connect at lower voltage, thereby saving on switchgear, cable and transformer costs. If the size of the proposed development is too large to be connected at the local distribution voltage, access to the transmission work at a higher voltage is required[7]. After failures, if the transient unstability does not occur in power systems, some wind turbines shut down due to their low voltage protections. Then outputs of wind farms decrease, which means that the power system lose reactive loads. Therefore the voltage levels climb up, even beyond the upper limits of wind farms buses. Capacitors are the mon reactive power pensation methods. When voltage levels dropdown, the amount of pensation decreases much. However the reactive power demands increase when the asynchronous machines are utilized in wind farms. So voltage levels drop down more, even beyond the lower limits of wind farms buses. With the increase of wind power installed capacity in power systems, the variability of wind power generation causes variability of voltage level, particularly if integrated into the grid which might not be specifically designed to cater for the significant and possibly rapid load variations (pared with normal customer load variation) caused by highly variable wind power generation. Therefore, the regulatory measures are needed to maintain the voltage level in a specified range. However, the variability of wind power generation is not a low probability。 VCI is cutin wind speed。 c is scale parameter. 沈陽(yáng)農(nóng)業(yè)大學(xué)學(xué)士學(xué)位論文外文翻譯 The relationship between the wind turbine output Pw and the wind speed up to the height of the hub v can be expressed approximately as the curve of wind turbine’s outputs vs. wind speed or a subsection function, as in formula (2). (2) where: Pw is rated output of the wind turbine。 most of the average annual wind speeds subject to the Wei bull distribution[5], as in formula(1). (1) where: v is average wind speed。 Sons Ltd， 2020 [11] Kumano T ． A short circuit study of a wind farm considering mechanical torque fluctuation[C]． IEEE Power Engineering Society General Meeting， 2020： 16 [12] Strbac G， Shakoor A， Black M， et al． Impact of wind generation on the operation and development of the UK electricity systems[J]． Electric Power Systems Research， 2020， 77(9)： 12141227 [13] Eriksson K， Liljegren C， Sobrink K． HVDC light experience sapplicable for power transmission from offshore wind power parks[EB/OL]． 沈陽(yáng)農(nóng)業(yè)大學(xué)學(xué)士學(xué)位論文外文翻譯 外文原文 Influence Research of Wind Power Generation on Power Systems Jane Austen， Kurt Felix （ State Key Lab of Control and Simulation of Power Systems and Generation Equipments，Manhattan District， New York， United States） Abstract: Wind power generation is always weather dependent and has the trend of being integrated to power systems as the form of largescale wind farms, which influences on power systems. Since the power work was not designed specifically to acmodate this type of generation, there are inevitably some points at which modifications must be executed if existing standards of electricity supply are to be maintained. This paper discusses in general terms the problems which are encountered by the developers of wind power generation projects and by utility grids when dealing with projects to integrate wind farms to power systems. The influence includes active and reactive power flow, voltage, system stability, power quality, shortcircuit capacity, system reserve, frequency and protection due to the characteristics of highcapacity, dynamic and stochastic performance of wind power generation. Corresponding countermeasures to handle these issues are remended in order to acmodate wind power generation in power systems. Key Words: wind power generation； power system； influence； wind farms 0． Introduction There is widespread acceptance that renewab