## 1 Introduction  
The rapid changes of sea ice condition in Arctic and Antarctica in recent decades have been considered one of the most impactful phenomena on Earth [1; 2; 3]. There are more and more researches and observations organized by China in Antarctica every year. Up to now, China has four Antarctic research stations, namely the Great Wall Station (62\({}^{\circ}\)12\({}^{\circ}\)59\({}^{\circ}\) S, 58\({}^{\circ}\)57\({}^{\circ}\)52\({}^{\circ}\) W), the Zho2033 ngshan Station (69\({}^{\circ}\)22\({}^{\circ}\)24\({}^{\circ}\) S, 76\({}^{\circ}\)22\({}^{\circ}\)40\({}^{\circ}\) E), the Kunlun Station (80\({}^{\circ}\)25\({}^{\circ}\)01\({}^{\circ}\) S, 77\({}^{\circ}\)06\({}^{\circ}\)58\({}^{\circ}\) E) and the Taishan Station (73\({}^{\circ}\)51\({}^{\circ}\) S, 76\({}^{\circ}\)58\({}^{\circ}\) E). The Great Wall Station and Zhongshan Station are both perennial research stations, which have the ability to accommodate dozens of expedition members and researchers to spend the whole year in Antarctica. Zhongshan Station was established in an area of Larsemann Hills on East Antarctica on 26 February 1989 as a Chinese observation base of high altitude physics, glaciers, atmosphere, ocean, biological ecology, geology, geomagnetism etc. Zhongshan Station is also the base camp for the Chinese National Antarctica Inland Research Base. Zhongshan Station can accommodate about 25 wintering personnel and 600 summer personnel. The current energy supply of ZhongshanStation mainly depends on fuel. The ecological environment in Antarctica is very fragile, and the fuel produces a lot of harmful gases. Although treated by Zhongshan Station, it cannot achieve zero pollution. The fossil fuels used by Zhongshan Station were transported by the Chinese observatory ship Xuelong every year. As the demand of research and observations increases in Antarctica, the amount of fuel consumption increases accordingly. Therefore, new demands for power supply in Antarctica for green, sustainable and less costly energy sources such as wind, solar, ocean were created. When humans do research in Antarctica, the impact of human activities on the natural environment of the polar region should be minimized as much as possible. Based on the special meteorological condition of Antarctica, some demands need to be proposed during designing and building the power system used in Zhongshan Station, East Antarctica. The use of fossil fuels is limited due to the inevitable pollution. There are abundant resources of wind, solar, and ocean energy in Antarctica, which can be considered a great advantage in the development of environmentally friendly power generation. Some works and research have reported on small standalone hybrid wind-solar systems which are isolated from the grid for observing systems deployed in the field in the Arctic Ocean and Antarctica [4]. The design of the hybrid wind-solar system was adopted because of the fluctuations of the solar and wind energy resources in polar regions. Some researches of hybrid wind-solar systems have reported. A report by Reference [5] indicates that the best fit of the wind turbine and photovoltaic (PV) array to a given load can be determined by the least square method. Some methods of modeling, designing and evaluating of hybrid renewable energy systems were also developed [6]. A hybrid solar-wind-battery system was used in the isolated site of Potou in the northern coast of Senegal to realize the minimization of the annualized cost and loss of power supply probability [7]. Based on a methodology of optimal sizing of a hybrid PV/wind system, this hybrid power system was installed on Corsica and can meet the desired system reliability requirements [8]. In some harsh environments in Iraq, the design of hybrid systems can be considered renewable resources of power generation and the simulation results illustrate that it is possible to use the solar and wind energy to generate enough power for remote areas [9]. Renewable energy such as wind energy and solar energy have been used in Antarctica.