Abstract
In some rural areas in the northwest of China, people are suffering from not only the voltage drop due to long distance transmission but also the power outages due to remoteness and poorly maintained grid. In recent few years, the price of solar energy has been reduced drastically every year in China due to the government policy on renewable energy. In the near future, isolated hybrid power systems for home use could be affordable and used by residences in these rural areas. Thus, it is necessary to design a hybrid power system based on local load and weather condition to check system feasibility and expected performance. It includes load simulation, system sizing, and dynamic system modeling and simulation. This paper firstly introduces current development of renewable energy in China and then goes through the sizing, modeling, and simulation of the system design for a typical remote home in China and finally discusses the system’s availability based on the simulation results. In this paper, the NASA website is the source for weather data, and BEopt is used to generate load data. During system modeling, the MPPT algorithm is much simpler designed than the complex incremental method. A soft starter is adopted with the diesel generator for stability. The charge controller of the battery storage provides external command to the MPPT and diesel PID controller to prevent the battery storage from overcharging. The rms value of the fundamental load voltage is used in the voltage control loop of the inverter.
Highlights
In some rural areas in Qinghai province located in the northwest of China, people have to put up with the voltage drop over 5% of the rated voltage due to long distance transmission
This paper presented a design of a hybrid power system for a remote location in China
The fundamental load voltage is steadily controlled at 220 V under drastic changes of the load power and the total generated power
Summary
In some rural areas in Qinghai province located in the northwest of China, people have to put up with the voltage drop over 5% of the rated voltage due to long distance transmission. Due to the lowest load priority of these areas, the power stability cannot be strictly maintained These areas have abundant renewable energy resources, especially solar and wind energy. The annual average wind density in Qinghai province is above 50 W/m2 [2] These data show great potentials to develop hybrid power systems in rural areas in Qinghai province. Due to the impulsive Chinese government policies for renewable energy, like reductions in sales and taxes, Chinese installed renewable energy in 2016 took the largest capacity of world, which can be seen from Figure 1 [3] This fast development decreases the price of the renewable energy. A number of such studies have been done for other parts of the world [4,5,6], and they all indicate a much better supply condition with an addition of hybrid power system
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