Scenery complementary power generation systems — the most reasonable independent power supply system. In today’s world, electricity has become the people’s lives is the most commonly used power sources, with the continuous improvement of people’s living standards and technological advances, people become increasingly dependent on electricity strong. At the region far away from the wind  power grid, the independent power supply system has become the people most in need of power. Forces border posts, the posts and telecommunications relay stations, roads and railway signal station, geological exploration and fieldwork of workstations, remote farmers and herdsmen have required low-cost, high reliability, an independent power system. Independent power supply which the most reasonable, this is people have been explored in research and questions, this article will be some connection, to address the issue, to put forward their views:
First, the evaluation of resources in remote areas generally do not load, so used to send electric power grids on the irrational, but can only directly at the local wind power generation, the most commonly used is the use of diesel generators. However, the storage and transportation of diesel in remote areas too costly and difficult to protect. Diesel generators so only as a short-term emergency power supply. To resolve the long-term stable and reliable power supply problem, can only rely on the local natural energy. Solar energy and wind power are the most common natural resources, is an inexhaustible supply of renewable energy. Solar energy on the Earth are the source of all energy, solar irradiation of the Earth each and every piece of land. Wind solar power at Earth’s surface are another manifestation of the Earth’s surface because of different forms (such as ground sand, vegetation, ground and surface) of the solar illumination of the endothermic coefficient is different at the Earth surface temperature, surface air temperature in different air convection arising from the formation of wind energy. Therefore, solar power and wind up at the time and geographical have strongly complementary to each other. The most sunlight during the day when the wind is very small, evening sun, the light is very weak, but because of the surface temperature changes in large and wind strengthening. In summer, sunlight intensity of large and small wind in winter, sunlight and wind strength of the weak. Solar energy and wind power at the time to make up the complementary nature scenery complementary generating system resources on the best matching, beautiful complementary generating system resources are the best independent power system.
Second, the technical evaluation of PV systems is the use of photovoltaic panels will convert solar power into electricity, and then through the battery charging controller, and finally through the inverter to the electricity load of a system power supply. The system’s advantages are the high system reliability, operation and maintenance of low cost, disadvantage is the high cost. Wind electric system is the use of small wind generators, wind energy will be converted into electrical energy, but through the controller of the battery, and finally through the inverter to the electricity load of a system power supply. The system’s advantages are a higher system capacity, lower system costs, operation and maintenance cost is low. Disadvantage is the low reliability of small wind turbines. In addition, wind power and photovoltaic systems are the existence of a common defect, that is, the uncertainty of resources leading to generation and load imbalance, wind power and photovoltaic systems must be stable through the energy storage battery power supply, but of every day generating capacity by a great influence on the weather, the system will lead to long-term battery status in the electricity deficit, which is caused by battery life of the main reasons for lowering. Because of solar power and wind energy are highly complementary and scenery complementary resources on generating system made up of wind power and photovoltaic systems in terms of resources on independent defects. At the same time, wind power and photovoltaic systems at the battery and inverter aspect can be generic, so beautiful hybrid generating system cost can be lowered, the system tends to a reasonable cost. Scenery complementary generating system can be based on the user’s electricity load and resource conditions of the rational allocation of system capacity, can ensure the reliability of electricity supply, but also reduce the cost of power generation systems. No matter what kind of environment and what kind of power requirements, scenery complementary generating system can be made to optimize the system design programs to meet the customer’s requirements. Should be said that the scenery of the complementary power system is the most reasonable independent power system. At present, the promotion of scenery complementary power system is the biggest obstacle to the reliability of small wind turbine problem. For decades, small-scale wind turbine technology has developed, according to aerodynamic theory, the use of mechanical control methods for small wind turbines at the wind speed under the protection status. Mechanical speed limit structure is characterized by small head or a fan of dynamic components in support of status, such a structure in the wind tunnel test conditions, can reflect the characteristics of a good speed, but under natural conditions, because of the wind speed and direction of change is too complex, and adverse natural conditions, small wind turbine to support the dynamic components will be the introduction of the inevitable vibration and damage moving parts, so that damaged units. The best small wind generator to retain only three moving parts (fewer moving parts the more reliable is the consensus of U.S.), The first wind generator wheel drive spindle rotation, two tail fins are fan-driven nose yaw, wind speed for the three are set up to protect moving parts. Before the two indispensable components of exercise, and this is also the basis for wind turbines, the practice of these two moving parts the failure rate is not high, mainly protection agencies limit damage to many. To solve the small-scale wind turbine reliability issues must be on the way at the speed limit there is the best solution.
Three, small wind turbine control of a new concept of setting wind speed protection is aimed at when the wind turbine at a wind speed, the wind turbine energy input was greater than the system can consume energy and energy storage system can the sum of the time, (let us call it wind turbine in a power-off state) can effectively reduce the wind turbine to absorb wind energy, making wind turbine will not be running for speeding. At present, the global wind turbine of the type of speed limit to protect the program can generally be classified as two categories: one, in some institutions to make the wind direction deviated from the round, reducing the wind round the windward area, thereby reducing the absorption of wind energy. 2, in some institutions to make use of the centrifugal force of the wind changed round blade pitch to reduce the wind round of wind power utilization, so as to achieve the effect of reducing the wind energy absorption. These mechanical speed protection device because the reliability of non-performing, in addition to poorly designed man-made factors, are in fact have their inherent drawbacks exist. Nature of the wind conditions are very complex, turbulent flow is the main status, at the same time, wind speed and wind direction changes frequently rapid, any mechanical devices can not be instantaneous response to changes in the actual wind conditions, together with the long-run will lead to the mechanical wear devices increases with the gap. All of these are caused by the protection of lagging behind, failure and severe shock, caused wind turbine speed, overload and rattling the destructive results.
Four, beautiful complementary generating system is the rational allocation of scenery complementary generating system by the solar panels, small wind turbine, the system controller, battery and inverter and so few parts, all parts of power system capacity to ensure the rational allocation Power system reliability is very important. Generally speaking, the system configuration should consider the following factors: 1, load characteristics of power generation systems are to meet the user’s electricity requirements designed to provide users with reliable electricity, it is necessary to a careful analysis of user’s use of electricity load characteristics. Learn the main users are the largest electricity load and the average daily electricity consumption. The largest electricity load selection systems are based on the capacity of the inverter, while the average power output is the day fans and the selection of PV panels and battery capacity based on capacity. 2. Solar energy and wind energy resources in project implementation of solar power and wind energy resources are the system of PV panels and select another fan capacity based on the general situation in accordance with the resources to determine the PV panels and the fan capacity coefficient, in accordance with the user’s Day determine the capacity of electricity under the premise of the capacity factor to consider, the final photovoltaic panels and fan capacity. In a recent validation of the national standard “off-grid household scenery complementary generating system technical conditions” in the capacity of the system identified the principle of selection. In short, the scenery of the complementary power generation systems are the most reasonable independent power system, such a reasonable performance at the most rational allocation of resources, technical programs the most reasonable, the performance of the most reasonable prices.

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