More and more enterprises have begun to build industrial and commercial photovoltaic power plants, starting from commercial operation revenues, and also contributing to low-carbon environmental protection. As the core equipment of the photovoltaic system, the selection of the inverter directly determines the efficiency of the photovoltaic system. So, how to choose an inverter for industrial and commercial power stations?
Power generation, power generation equipment, intelligent protection, quality, and electrical network love are the five important considerations for the selection of inverters in industrial and commercial power stations.
01 Power generation
In terms of power, in addition to looking at the power parameters of the inverter (maximum power, MPPT power), the following aspects need to be paid more attention to, which will directly affect the power generation.
Number of MPPT channels
Under the same input power, the number of MPPT channels of the inverter affects the power generation of a photovoltaic power station, especially when the power station has problems such as shadow occlusion, module orientation ambiguity, and module performance disagreement.
DC voltage working scale
The lower the lower limit of the inverter's operating voltage scale, the earlier the inverter starts and shuts down, the longer the daily power generation time will be, and the higher the power generation. The higher the upper limit of the working voltage, the higher the module voltage of the inverter at low temperatures, the higher the voltage can be accepted without reporting the PV overvoltage error, the more stable operation and the more efficient power generation.
02 Power generation equipment
The equipment of inverters and photovoltaic modules also affects the power generation power and the cost of building stations to a certain extent.
Suitable for high-power components
With the successive listing of ultra-high power modules, high-power modules have become a trend in shopping malls. If only the power of the module is added, the power of the inverter does not match, and the power generated by the module will be wasted. If only the inverter power is added, and the module power is not added, the DC cable usage will definitely be added, and the DC loss will also be added. Therefore, the selection of photovoltaic inverters suitable for high-power modules is the choice that benefits both power generation and cost.
Overallocation & Overload
The total capacity of PV modules is larger than the capacity of the inverter, which is called overallocation. Due to the attenuation of module power, line loss, system loss, dust occlusion, and the difference in illumination in different regions, the overall revenue of the power station system can be improved by adopting appropriate overconfiguration. The overload capability of the inverter can effectively reduce the curtailment rate and extend the full power operating time of the machine, and expand the overallocation share of modules.
Therefore, the overallocation and overload of inverters have also become an important reference target for the selection of photovoltaic inverters in industrial and commercial power stations.
03 Intelligent protection
Since the inverter is mostly installed outdoors, in addition to the basic maintenance functions such as IP protection level, AC and DC secondary lightning protection, island maintenance, insulation fault detection, leakage current detection, etc., there are several functions that must be understood:
Intelligent IV diagnostics
It can accurately locate string faults and automatically find problems. Multiple guarantees, stable operation of the power station, and real peace of mind for users.
Fault recording
Real-time observation and recording of the voltage and current waveforms on the AC side of the inverter to quickly locate problems.
DC arc pull detection AFCI
It can accurately distinguish the arc signal, quickly shut down, avoid fire, and maintain the safety of users.
At the same time of a number of safety protections, it is equipped with an intelligent monitoring and management platform, which can be used to monitor the power station with mobile phones and computers, and can check the operation data of the power station at any time and understand the status of the power station in time. At the same time, manufacturers can find problems, analyze the causes of problems, provide solutions, and solve problems through long-distance diagnosis in a timely manner.
04 Quality
The quality of the inverter is affected by a number of objectives, and the product design, equipment selection and manufacturing process will affect the service life and fault rate of the product, which will directly affect the operating cost of the power station. Due to the large number of targets touched here, you can consider directly selecting the brand inverter with well-known and positive reviews in the mall.
INVT PV is a wholly-owned subsidiary of INVT (stock code: SZ 002334), relying on the 20 years of technical insight of the parent company, INVT PV has unique advantages in development, production and sales. As one of the top ten brands of photovoltaic inverters in China, INVT photovoltaic inverters have been successfully sold to more than 80 countries and regions around the world, and the products have been connected to the grid and operated efficiently and stably in many residential and industrial and commercial power station projects around the world.
05 E-nets love
With the increasing share of new energy, the grid-connected performance will directly affect the safe operation of the power grid. Therefore, whether the photovoltaic power station chooses "complete spontaneous self-use", "spontaneous self-use, surplus electricity to the grid", or "full grid" mode, it is necessary to take into account the problem of the power grid love of the equipment.
Support low SCR
Short Circuit Ratio (SCR) is used to characterize the strength of the grid at the grid-connected point of a new energy power station. Supporting low SCR can ensure that the power station maintains steady-state operation, completes transient fault traversing, and maintains power quality under the condition of weak power grid. At present, the power grid requires the lower limit of SCR to be 1.5, and the lower the number, the better the habitual and stable environment of the weak power grid.
Industrial and commercial photovoltaic • equipment proposition
Take the 1MW industrial and commercial photovoltaic power station as an example: 540W photovoltaic modules can be selected, and 9 INVT XG100kW three-phase grid-connected inverters can be equipped.
PV equipment mode: one string for every 16 modules, 14 strings to the inverter.
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