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For a house-distributed PV system, when the types of the PV array are different, mounting orientation and tilt angle are different, or some modules are in shade conditions, which inverter shall be chosen to maximize the power generation yield for the user?
The MPPT technology can guarantee that the PV array works around the maximum power point constantly, thus providing a guarantee for the improvement of the generation efficiency. Statistics show that the generation efficiency of PV inverters with MPPT technology is 10%~20% higher than that of traditional ones. That is to say, under the same conditions and with the same PV modules, a system with MPPT technology will generate more power, which means the production cost per unit of electricity will be lower.
By increasing the efficiency of power generation and developing the application of renewable energy. It also reduces dependence on conventional energy sources, decreases energy imports, saves foreign exchange expenditure, and lowers resource wasting.
The MPPT controller can avoid overvoltage or overcurrent in extremely bad weather or high radiation intensity input by the PV cells that may cause damage to other equipment of the system. This can lower maintenance and replacement costs for the equipment of the PV system.
The diversity of MPPT technology does bring great convenience to the design of power plants. Based on the actual terrains and light conditions, making scientific choices of different inverters will reduce the cost of the power station and improve economic efficiency. For example, in hilly regions and rooftop power stations, the selection of inverters with multiple MPPTs and two-level topology with wide input voltage is recommended to expand morning and evening generating time. In flat and open regions, the selection of a single MPPT and single-stage topology can be used to improve system reliability and reduce system cost.
MPPT technology helps reduce the O&M cost of the PV system through improvement in system efficiency and equipment protection. In 2022, the O&M cost of distributed PV system is RMB 0.048/(W-year), and that of centralized terrestrial power station is RMB 0.041/(W-year), which slightly decreases compared with 2021. The O&M cost of both ground-based PV power plants and distributed systems will continue to decrease slightly in the next few years.
This designates that the power rating of the inverter must match the total installed capacity of the PV system. Consequently, the inverter would be prevented from overloading and hence being damaged. It would also ensure that full utilization of the power generated by the PV system occurs.
The MPPT voltage range of the inverter must be matched to the operating voltage of the PV modules. MPPT is a method to ensure that the inverter extracts the maximum energy output from the PV modules under changing environmental conditions. This MPPT voltage range is
The working voltage of the PV modules has to be matched with the MPPT voltage range of the inverter. MPPT is an algorithm that enables the inverter to extract the maximum available energy output from the PV modules for any given environmental condition. Thus, by matching the voltage range, the energy efficiency from the PV system will be maximized.
This is usually limited by maximum DC access string power and maximum input voltage, which the inverter should be able to handle. For example, using some inverters, it is possible to access modules up to 14 kW, and the open circuit voltage for individual strings should not be higher than the maximum input voltage of the inverter at 1100 V. This ensures that the inverter works within safe limits.
The number of MPPT circuits of the inverter determines how many PV strings can be connected parallel. The use of several MPPT paths increases the flexibility and efficiency of the system and allows a greater number of PV strings to work at optimal efficiency.
High-efficiency inverters can be selected in order to reduce energy losses in the system's overall performance. It should be remembered that the higher the inverter efficiency, the lesser the energy loss during conversion.
The inverter should be designed to have protection functions necessary for safe operation of a system, such as insulation impedance detection, leakage protection and temperature protection. This kind of protective function may prevent the inverter from being damaged in case of a fault or abnormal conditions and protect personnel safety.
The size and weight of the inverter, besides its mounting method, will also be considered for easy installation and maintenance. Choosing the right size and weight will ease the way to installation besides facilitating future maintenance.
The inverter should work in a stable way in the expected operating environment, including extreme temperatures. This means the inverter will be working correctly under different climatic conditions.
While selecting an inverter from a reputable brand means quality of products and after-sales service, which is very important for long-term reliability and performance of the systems. Good after-sales service could provide timely support should the inverter ever cause any problems.
Finally, there is a need to consider the cost effectiveness of the inverter and to select an inverter that will be cost-effective for maximum return on investment. This actually means selecting an inverter that is cost-effective with regard to fulfilling the technical requirements, considering the economic issue at hand.
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