How to solve the photovoltaic power station 'inverter' common faults?

Inverter as inspection center of the whole plant, on the dc component, next to the interconnection equipment, basic all plant parameters can be detected by inverter. General inverter as long as in the state grid, monitoring shows that the power curve of normal

as a testing center of the whole plant, inverter can through the inverter DC component inspection and almost all plant parameters of grid equipment. In general, as long as the inverters connected to the electricity grid monitoring shows that the power curve is a normal 'mountain' line, proved stable plant operation. If there is abnormal, but through the inverter feedback information to check the health of power station auxiliary equipment. Listed below are the basic problems and processing methods: basic problems and handling method 1. Low insulation resistance: use the method. Pull out all the series inverter input side, and connect them one by one. Use the function of inverter to detect insulation impedance, string to detect problems. After the string to find problem, the key to check whether there is water short circuit DC connector stents or short circuit. In addition, it also can check the component itself whether there are black spots on the fringe and destroyed, resulting in leakage to the ground grid components through framework. 2. Low voltages: if occurred in early/late, this is a normal problem, because the inverter are trying to limit power conditions. If happen in the normal during the day, detection method is still the elimination process, detection method is the same as item 1. 3. Leakage failure: the root cause of this problem is to install the quality problem, this is due to installation position error and poor quality of the equipment. There are many point of failure: low quality of the DC connector, low quality components, installation height of the unqualified components, low quality of grid equipment or leaking. Once appear similar problems, solar photovoltaic power generation can be achieved by fault point and found that the powder to do a good job of insulation to solve the problem. If the problem is local, it can only change the material. 4. DC overvoltage protection: components for efficient process improvement, constantly update and improve the power level, components of the open circuit voltage and working voltage is also improved. Temperature coefficient must be taken into account in the design phase, in order to avoid low temperature overvoltage caused serious damage to equipment. 5. Start the inverter no response, please make sure that the DC input line no reverse connection. Carefully read the manual of inverter is very important to ensure that the positive and negative is curly. Inverter built-in short-circuit protection, reverse connection recovered to normal boot properly. 6, power grid failure: grid overvoltage: reflects (early heavy load of power grid High power consumption of working time) / light load ( Low power consumption time off) The survey work. Should survey the health of the grid connection of voltage and the inverter manufacturer's technical communication and the state of the grid technology to ensure the project design in a reasonable range, must not 'taken for granted. Especially in rural power grid, the inverter to the grid voltage, grid waveform and interconnection distance have strict requirements. Grid overvoltage is the main reason of the light load voltage is more than or close to the original power grid security and protection value. If a grid line is too long or voltage connection is not good, cause the line impedance/inductance is too large, the power station will not be normal and stable operation. Solution is to find a power supply bureau to coordinate grid voltage or correct choose strictly control the quality of power plant construction.