Eight key points in the design of photovoltaic inverter power supply

The photovoltaic inverter power supply design is the core of photovoltaic power station, but few know. There are, of course, there will be books or through the network to study, however, most of the time misled by some wrong views, lead to can't achieve the desired effect. So, to introduce the next eight points in the design of photovoltaic inverter power supply. 1, same size, same material, Single crystal/polycrystalline) The same power rating of the component, if is not the same as the standard conversion efficiency, are deceptive. This is a law, no exception. 2、STC( Standard test condition, the standard test conditions) And NOCT ( Nominal Operating Cell Temperature, the solar battery Nominal Operating Temperature) Difference, in addition to the established numerical difference on several parameters, NOCT the introduction of 1 m/s wind speed parameters, its purpose is to fit better practical work when the output power of the component. 3, photovoltaic cells is high resistance current source, the battery is low resistance voltage source. This explains the short-circuit components, we can directly but never short-circuit the battery. 4, the working voltage of maximum power point of component and component open circuit voltage is 0. 8 constant relations, very close. The relationship in preliminary estimates is important when inverter and the system structure rationality and convenience. At the same time for MPPT algorithm design is of great significance. 5, if things towards the required number of components of the overall structure is the same, then don't need to worry about the problem of voltage displacement, can rest assured bold in parallel. Basically, as long as the light intensity in more than 50 w/m2, components can work, and the output voltage. This explains the inverter start early, but the real power output is lagging phenomenon for a period of time. After June, when the battery is covered, equal to became a big objective of resistance, if not the drainage can be quickly fever. This also is the fundamental principle of component and the bypass diode activated switch. 7, components on STC label state under the definition of 25 degrees Celsius, is the job of the component temperature rather than the environment temperature. So you when calculating the temperature influence on the minimum operating voltage, want to work at the room temperature additional plus 25 degrees panels to heat up. However, when calculating the temperature influence on the maximum open-circuit voltage is not can work plus 25 degrees of warming. These 25 degrees, for more than 3 kw project calculation, is a very considerable error. 8, the cloudy or maomao rainy day without the sun, the system output power is very small, in fact, the component of open circuit voltage or working voltage is still very high, even is full! Australia so many cloudy day indoor replacement inverter installation workers get an electric shock. Please keep in mind, cloudy, components may not be output power, but not mean it is dead. This is an often overlooked by people's common sense. More than one in the photovoltaic inverter power supply system is easy to ignore some details by designer, but also important part. Hope that through this article summary and introduction, can let people remember the knowledge points, walk less detours in the design process. More articles about photovoltaic inverter show: what is the core component of inverter respectively
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