The function of the photovoltaic inverter and classification

In general can convert ac power to dc rectifier is the process by which, the function of rectifier circuit known as the rectifier circuit, the actual process of rectifier equipment or device called a rectifier rectifier, and the matching converts dc to ac power inverter is the process by which, the call to complete the function of inverter circuit inverter circuit, the actual process of inverter device called the inverter device or inverter. Photovoltaic inverter photovoltaic components made by direct current (dc) into a sine wave current, connected to the load or incorporated into power grid, is the core device in the photovoltaic system. Photovoltaic inverter types and main function of the pv inverter is divided into grid inverter according to the use, off-grid inverter, micro energy storage inverter three categories, grid inverter according to the power and purpose can be divided into the micro inverter, the set of string type inverter, collecting and distributing type of centralized inverter, inverter four categories, the micro inverter, inverter is also called the components, power rating of 180 w to 1000 w, suitable for small power systems; Set of string type inverter, power in the 1 kw to 5 kw single-phase inverter, suitable for household power systems, grid voltage is 220 v, 5 kw to 70 kw three-phase inverter, apply to the industrial and commercial power systems, grid voltage of 380 v three-phase. Grid inverter grid inverter is the key of grid connected photovoltaic arrays and components, in addition to the components of direct current into alternating current (ac) power grid can receive, and the following special features: maximum power tracking MPPT function when the sunshine intensity and environment temperature changes, photovoltaic modules input power present nonlinear variation, as shown in figure, seen from the figure: photovoltaic modules is neither a constant voltage source is not a constant current source, with its power output voltage change and change, has nothing to do with the load. Its output current with increasing voltage is a horizontal line at the beginning, to a certain power, reduce with voltage increasing, when arrived at open circuit voltage components, the current drop to zero. The output power of photovoltaic modules by sunshine intensity, the influence of factors such as environmental temperature. Light intensity, small photovoltaic modules of open circuit voltage is reduced, short circuit current decreases, and the maximum output power decreases, When photovoltaic component temperature drop, the component of short-circuit current is reduced, but the components of the open circuit voltage, maximum output power increases; Component temperature and sunshine intensity in certain cases, the same components only, the only point of maximum power output, the MPPT function is the most power tracing function, through the adjustment of dc voltage and output current, make the solar component always work in the maximum working point, the output current of maximum power under the condition of temperature and sunlight. Common maximum power tracking control method mainly has: constant voltage tracking method ( CVT) , the terminal voltage of photovoltaic components fixed on a fixed value, is characterized by simple control, good stability; Power calculation method of current optimization method, the disturbance observation method, the incremental conductance method such as classical control algorithm and the optimal gradient method, such as fuzzy logic control, neural network control method such as modern control algorithm. Islanding detection and control in the normal power generation, photovoltaic (pv) grid power generation system connected to the power grid, the grid active power, however, when the electrical breakdown, photovoltaic (pv) grid power generation systems may work continues, and the independent operation of the local load, this phenomenon is called the islanding. Inverter islanding, the personal safety, power grid operation, the inverter itself cause great potential safety hazard, so the inverter into standard regulation, photovoltaic (pv) grid inverter must have the islanding detection and control function. Islanding detection method of passive detection and active, passive detection method of grid inverter output voltage and current amplitude, photovoltaic inverter and jamming signal, not to the grid by detecting parameters such as current phase shift and frequency is more than a specified value, to determine whether the grid power; This way not to cause power grid pollution, there will be no energy loss; And active detection refers to the grid inverter, timing, actively exert some disturbance signal of power grids, such as frequency and phase movement, due to the power grid can be as an infinity of voltage source, a power grid when the interfering signal will be absorbed by power grid, power grid in the event of power failure, the jamming signal will form a positive feedback, will eventually form the frequency or voltage levels, which can determine whether the islanding. Power grid interconnection and interconnection function examined before inverter connected to the grid, need to take electricity from the grid, the voltage, frequency, phase sequence detection power grid transmission parameters, and so on, then adjust the parameters of the power itself, consistent with grid electricity parameter synchronization, have completed grid power. Zero ( Low) Voltage across function when power system accident or disturbance, photovoltaic power station and node voltage sag, voltage within a certain range of the voltage drop and the time interval, pv power station can ensure network run continuously. Keywords: inverter more articles about photovoltaic inverter show: photovoltaic inverter installation costs how much do you know?
Wenzhou Xihe Electric Co.,LTD. is different from other companies as we provide timely and unique services to our respected clients.
We believe our ability can raise a giant wave of innovation among the field of custom inverter.
The charge controller manufacturers-type custom inverter is poised to lead the charge controller manufacturers market.
Diversifying is an excellent growth strategy, as it allows Fangpusun to have multiple streams of income that can often fill seasonal voids and, of course, increase sales and profit margins.
While buying the products, make sure that you purchase them from a reputed and trusted seller - either online or offline. Wenzhou Xihe Electric Co.,LTD. is specialised in the field of , offering a wide range of products like custom inverter, charge controller manufacturers, charge controller manufacturers,etc.