1、 Match the rated power and voltage level of the generator
Power selection principle: The rated output power of the inverter should be ≥ the maximum output power of the hydro generator, with a reserved redundancy of 10%~20% to avoid equipment overload losses caused by long-term operation at full load.
Voltage level adaptation: Select the corresponding model based on the rated voltage of the generator. Small power units are adapted to a 400V voltage level, while high-power units above 300KW can choose a 400V/690V dual voltage adaptation model to match the output characteristics of the generator.
2、 Adapt to the on-site power grid and environmental conditions
Grid parameter matching: Confirm the voltage and frequency parameters connected to the grid, select models that support the corresponding range of grid fluctuations, and prioritize models that support 220V/380V/440V/480V wide voltage adaptation for conventional three-phase 380V grids.
Environmental protection selection: Choose IP20 protection level models for indoor installation scenarios, and prioritize IP65 protection level models for outdoor, high humidity, and dusty outdoor hydropower station scenarios, suitable for the conventional working temperature range of -10~50 ℃.
Special working condition adaptation: For high-altitude and low-temperature areas, additional customized models that support wide temperature expansion and high-altitude capacity reduction optimization should be selected to avoid environmental factors affecting equipment operation stability.
3、 Match core functions with performance indicators
Efficiency and harmonic requirements: Priority should be given to selecting models with the highest overall efficiency ≥ 96% and current harmonic THD<3% under rated operating conditions to reduce energy loss and avoid harmonic pollution of the power grid.
MPPT range adaptation: Based on the actual output voltage fluctuation range of the hydro generator, select the model that covers the corresponding MPPT voltage range to ensure maximum capture of water energy.
Communication function selection: For scenarios that require remote monitoring, select models that support remote communication interfaces such as RS485/WiFi/GPRS/Ethernet to achieve remote real-time monitoring of power generation and operating status.
4、 Supporting protection and operation and maintenance requirements
Protection mechanism verification: Confirm that the model is equipped with comprehensive safety protection functions such as polarity reversal protection, short circuit protection, islanding effect protection, low-voltage crossing, overheating protection, overload protection, etc., to meet the requirements of grid connection safety regulations.
Scalability: In scenarios where there are plans for installation and expansion in the future, modular models that support parallel deployment of multiple units can be selected to increase the total power generation capacity without the need for overall equipment replacement.
Convenience of operation and maintenance: Priority should be given to models with touch screen display and support for automatic restart, reducing the threshold for on-site operation and maintenance, and adapting to the unmanned operation needs of small and medium-sized hydropower stations.
