working principle

In addition to the DC-AC conversion function, the solar grid tie inverter shall also own the solar cell array MPPT function and various protection function. The solar cell array delivers power energy to the power grid through sine wave PWM inverter. The power sent from the solar on grid inverter to power grid is determined by the solar cell array power and local sunshine conditions of the specific time. Now, power inverter technology becomes very mature. The work principle: When the power supply of the utility grid is stopped, the grid side will stay in short-circuit status. At this time, the grid tie solar inverter will start self-production function because of the overload problem. When the overload situation is detected by the microprocessor, it will block the SPWM signal and will trigger the circuit breaker connected with the power grid. If the solar cell array can output energy, grid tie solar inverter will operate separately, which can be controlled easily. It only needs to know the negative feedback status of the AC voltage. The microprocessor will detect the output voltage of solar grid tie inverter and compare it with the reference voltage (normally is 220V). Then, it will control the PWM output duty cycle to realize inverting and stable-voltage operation.

The sun releases very tiny energy packets called photons. These photons come from the sun to the earth in approx 8-9 minutes. In theory, the number/volume of photons incident on the earth per hour is enough to meet the world's energy needs for one year. Imagine how much energy we get from the sun!

The Maximum Power Point Tracking (MPPT) system is an electric system which can ensure the photovoltaic panel to output more electricity by adjusting the electric module’s working status. It can effectively store the DC emitted by the solar cell panel in the accumulator to effectively resolve the problem with the conventional grid that the domestic and industrial power use in remote areas and tourist destinations is not satisfied, while avoiding causing environmental pollution.

In our daily life, most electronic products are used through 110V or 220V AC by switching power supply or some other rectifier circuit to convert AC to DC, and the so-called inversion is the process of converting DC to AC, which is a reverse process of rectifier conversion, so the inverter is named after this. Inverters bring us a lot of convenience in our life, such as outdoor barbecue, outdoor lighting, car refrigerators, etc., which are all used by converting DC power in storage batteries into AC power through inverters. Let's learn about the basic working principle of power inverter.