30 solar street lamp manufacturers

Led lights factory introduction to solar photovoltaic inverter connected to the electricity grid layout and photovoltaic system to realize its potential security problem, we must improve the efficiency of power generation to reduce cost per kilowatt. It is well known that the solar cell is the foundation of the solar radiation is converted to electricity efficiency

led street lamp manufacturers of solar photovoltaic inverter grid layout and security is discussed in order to realize the potential of photovoltaic power generation system, must improve the efficiency of power generation, reduce the cost per kilowatt. It is well known that the solar cell is the basic efficiency of solar radiation into electricity. Pv manufacturers are also in the design of the next generation of inverter, by increasing the diagnosis and other functions, can improve power and efficiency, increase intelligence and functions. The latest trend is more string technology: will a series of connected solar cells connected to a single inverter, where each cell has its own maximum power point tracking ( MPPT) Equipment, in order to maximize the energy. The solar cell is not easy to use. The output open circuit, battery voltage is about 0. 6V。 Generally, each solar panels up to 72 cells, form 44 v. Short circuit batteries can output current of a certain level. In a point between these limits, the battery will be in a certain voltage and power flow of the maximum power output. The maximum power point with the operating conditions ( As expected the sun radiation levels) Change, so the inverter must be tracked to maintain the highest efficiency point. The designers rely on the voltage and current sensors to the real-time data collection, and through the software algorithm. The inverter output current is usually 15 to 50. Sensors measure the pulse width modulated sine wave output feedback controller, and measure the power into the grid. Controller is mainly based on the microprocessor or a digital signal processor, equipped with + 5 V power supply, Shared with other active components of electronic control system working voltage benchmark. Module of helmet mounted display running current sensor on a + 5 v power supply. Internal reference voltage ( 2. 5 v) Through a separate pin to provide, which makes them easy to use with digital signal processor or microprocessor. However, they also can take the external reference voltage of the digital signal processor ( 1. 5 to 2. 8 volts) And produce their own reference voltage. This makes the application more efficient, and helps eliminate drift of reference when calculation error. Solar panels are used in the inverter by transformer or direct connection of transformer design is connected to the grid. According to the layout, the former could make labor frequency transformer in the power grid access point, or internal use of high frequency transformer in inverter circuit as a separation point. Based on low frequency transformer circuit provides natural protection, prevents the dc current into ac power grid, but the loss of transformer itself will cause the loss of efficiency. Because of the IGBT switching is not accurate, the inverter ac output may be DC component; Current sensor used in the inverter control circuit of DC disorders show for the output circuit of the DC component, therefore disorders should be minimized. Grid can accept the DC power supply tightly restricted; Designers are faced with the problem is not only these limits vary from country to country, and some is the percentage of the rated current ( Such as 0. 5%) Said, some are as low as 20 ma ( The British standard) The absolute limit. In all cases, it is necessary to measure the small DC current in the large ac current, at the same time, it is necessary to have minimum offset and drift. Another security problem is leak into the ground. Configuration, there is no transformer leakage of solar panels or the human body impedance under any circumstances have grounding path. It is necessary to use residual current device ( RCD) To detect unsafe grounding current, or used again with appropriate specifications of the current sensor to embedding RCD function in the design of inverter. In this way, the system can be recognized in the prescribed standards in different security levels ( A few milliamps) ( Ac and DC) Up and running, and the solar cell device and the capacitance between the ground near the strong communication grounding current.