Intelligent Functions of Deye’s Grid-Tie Inverters

PV power station

In the world of solar energy, the inverter serves as the ‘brain’ of a PV power station and is the only intelligent component directly connected to the power grid, orchestrating multiple digitalized functions. Today, let’s talk about the intelligent functions of Deye’s grid-connected inverters.

Automatic operation and shutdown function

After sunrise, the intensity of solar radiation gradually increases, and the open-circuit voltage of the PV strings rises. The inverter automatically starts when it reaches the required start-up voltage. When the sun gradually sets, the PV string voltage decreases, and the grid-connected inverter enters into the shutdown state when it falls below the starting voltage.

Intelligent anti-PID effect

The PID effect (Potential Induced Degradation) of photovoltaic modules refers to the phenomenon of power degradation that occurs when the modules are subjected to a certain external voltage for a long time, which reduces the power generation capacity and the revenue of the photovoltaic power plant. The principle of Deye grid-connected inverter against PID is that when the voltage of the DC bus is lower than 50Vdc, the PID module automatically raises the negative voltage of the component, so that the negative voltage of the component of each inverter to the ground is close to 450V, reducing the accumulation of charge on the surface of the battery in the component, so as to achieve the purpose of suppressing the PID effect of the component.

photovoltaic modules

Intelligent MPPT

Under the same lighting conditions, PV modules will have different output currents at different operating voltages. When a PV module operates at a specific voltage, the product of that specific voltage and output current reaches its maximum value, and this operating point is the maximum power point, which is also when the PV module generates electricity with the highest efficiency.

However, in general, PV power is affected by a variety of factors, such as the stronger the sunlight, the higher the PV module output power; or the higher the temperature of the PV cell, the lower the PV module output power. Therefore, in different environments, the maximum power point of PV modules will change with the actual situation.

How can the PV module always obtain the maximum power point under different circumstances?

That’s where MPPT plays a role. Maximum Power Point Tracking (MPPT) is equivalent to the brain of the PV module, which is an automatic optimization process, capable of detecting the power generation voltage of PV modules in real time and tracking the voltage and current values so that the PV power plant can track the maximum power point under different sunlight and temperature environments so that the system can output maximum power.

Intelligent anti-islanding

Anti-islanding function: when there are high-voltage, low-voltage, high-frequency, or low-frequency faults in the power grid, the relay at the grid port of Deye inverter will automatically disconnect in time. When the power supply is restored and the voltage and frequency reach the permissible values, the relay at the grid port will be closed automatically.

Deye inverters are equipped with anti-islanding protection circuits, and the grid ports of the strings and energy storage machines are equipped with relays and voltage acquisition components. When the inverter grid voltage acquisition component detects the disconnection of the power grid or loss of voltage, it will disconnect the grid relays and isolate the connection between the inverter and the power grid, which plays a role in safety protection and prevents the occurrence of the islanding effect.

Intelligent String Monitoring

Based on the original MPPT monitoring, Deye inverters have long realized intelligent string-by-string monitoring. Through high-precision DC sensors, it accurately detects the current signal of each string, and by comparing the currents of each string, it can quickly determine which string is faulty, thus improving the speed of after-sales diagnosis and processing.

Intelligent air cooling

Heat dissipation is an important issue for inverters. If the heat dissipation is not good, it will seriously affect the output capacity and service life of the inverter. The 10-degree rule for electronic devices means that for every 10 degrees Celsius rise in temperature, the life span of the device will be reduced by half. Deye inverters employ intelligent air-cooling, with external high-performance fans, built-in temperature sensors, and driving circuits to monitor the device temperature in real-time, and automatically drive the fan to start and stop through the threshold setting. It collects real-time temperature data, intelligently turns on the fan, and intelligently adjusts the wind speed, so it is not afraid of high temperatures.

Intelligent reactive power compensation

In the application scenario of PV self-generation and self-consumption, the power consumed by the load includes not only active power but also reactive power. The power grid company only charges active power when settling the electricity bill. Still, at the same time, it will assess the power factor, and if the power factor is lower than the requirements of the power grid company, the power grid company will penalize and charge the power adjustment power fee.

Deye’s grid-connected inverters and energy storage inverters are equipped with various reactive power regulation methods. They support dynamic adjustment of the reactive power output ratio according to the PF value and grid voltage. The reactive power output can also be adjusted according to the active power value. In addition, the reactive power output of the inverter can achieve the function of reactive power compensation, provide reactive power support, and reduce the reactive power consumption of the grid system.

PV module

PV power stations

 

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