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Views: 18 Author: Site Editor Publish Time: 2023-05-18 Origin: Site
Photovoltaic On/off grid inverters can convert the variable DC voltage generated by photovoltaic (PV) solar panels into mains frequency alternating current (AC), which can be fed back to commercial power transmission systems or used by off-grid power grids. Photovoltaic On/off grid inverter is one of the important system balance (BOS) in photovoltaic array system, and it can be used with general AC power supply equipment. Solar On/off grid inverters have special functions that cooperate with photovoltaic arrays, such as maximum power point tracking and islanding protection.
What is the general meaning of photovoltaic On/off grid inverters?
What is the general process of photovoltaic On/off grid inverters?
What is the general structure of photovoltaic On/off grid inverters?
The small off grid photovoltaic power generation system is composed of photovoltaic arrays, battery packs, photovoltaic controllers, photovoltaic On/off grid inverters, and AC and DC loads. During the day, the photovoltaic array converts solar energy into electrical energy, and under the control of the photovoltaic controller, it provides electrical energy for the AC and DC loads and charges the battery; at night, the electricity stored in the battery is supplied by the photovoltaic controller to the AC and DC loads.
The input circuit shapes and filters the DC power from the photovoltaic array or battery. The inverters of small off grid photovoltaic systems often use single-phase inverters. The inverter circuit converts DC power into single-phase AC power. If open-loop control is used, the output There is no need to feed back to the control circuit, and if closed-loop control is used, the output will also be fed back to the control circuit. The function of the control circuit is to generate and adjust a series of control pulses as required to control the on and off of the On/off grid inverters switch, so as to cooperate with the On/off grid inverters main circuit to complete the inverter function. The function of the auxiliary power supply is to provide DC working voltage for the control circuit. The protection circuit mainly realizes overvoltage protection, undervoltage protection, overload protection, short circuit protection, etc.
Taking into account the energy consumption of the transformer in the inverter circuit using the transformer, the topology adopts a transformerless inverter circuit, showing that the DC power from the battery or photovoltaic array is boosted by the DC, and then filtered through the On/off grid inverters to transform it into AC power that can be directly used by the load.
Single-phase On/off grid inverters generally have three structural forms: push-pull, half-bridge, and full-bridge. The switch tube in the push-pull circuit needs to withstand twice the DC voltage. It is relatively difficult to select the switch tube and the transformer The phase rate of utilization is low, which reduces the efficiency of the entire On/off grid inverters system to a certain extent; if the half-bridge circuit wants to get the same power as the push-pull and full-bridge, the switch tube needs to withstand twice the current. The full-bridge inverter circuit overcomes the shortcomings of the above two structures. The steady-state operating voltage of the switch tube is equal to the DC input voltage. Under the same power, the current of the switch tube is half smaller than that of the half-bridge type, so the full bridge is used here. The structure of the On/off grid inverters. The main On/off grid inverters circuit consists of two parts, the DC-DC boost part and the single-phase full-bridge inverter part.
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