Street lamp automatically

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

discuss Led street lamp manufacturing solar photovoltaic inverter grid layout and safety of

in order to achieve its potential, photovoltaic system must improve the efficiency of power generation to reduce 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 to improve power and efficiency, intelligence and functions. The latest trend is more string technology: several series of solar cells in series to a single inverter, where each cell has its own maximum power point tracking ( MPPT) Device, resulting in a maximum energy. The solar cell is not easy to use. Battery open circuit, the output rated voltage is about 0. 6 v: usually 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 that point to maintain maximum efficiency. The designers rely on the voltage and current sensors to the real-time data collection, and through the software algorithm. Inverter output current is usually between 15 to 50 Ann, PWM sine wave output feedback controller, is measured by the sensor to measure electricity into the grid. The controller is mainly based on microprocessor or a digital signal processor, equipped with + 5 v power supply, with the electronic control system of other active element Shared work voltage reference. Module of helmet mounted display current sensor with + 5 v power supply. Internal reference voltage ( 2. 5V) Through a separate pin to provide, makes it 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) To 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 the isolated 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 switch 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. Network acceptable DC power seriously restricted. Designers are faced with the problem is not only these limits vary from country to country, and some limit expressed as a percentage of the rated current ( For example, 0. 5%) Low, some restrictions to 20 ma, The British standard) The absolute limit of said. In all cases, you must measure the small DC current in the large ac current, at the same time, must have a 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 again using the appropriate current sensor to embedding RCD function in the design of inverter. Through this method, the system can be found in standard approved by the different security levels ( A few milliamps) ( Ac and DC) Next up and running, and at the same time under the solar cell device and the capacitance between the ground near the strong communication grounding current.