As the core hub of energy conversion in photovoltaic power plants, inverters undertake the key task of converting the output DC power of photovoltaic modules into grid connected AC power. The conversion efficiency, harmonic level, power factor and other indicators of inverters directly determine the overall power generation revenue of the power plant. Most traditional inverter testing equipment requires shutdown and power-off for testing, which can cause loss of power generation. At the same time, some equipment has limited range and cannot adapt to the current 1500V high-voltage system, making it difficult to meet the requirements of on-site acceptance and maintenance diagnosis. Shanghai LAILX is deeply involved in the research and development of photovoltaic testing equipment, and has launched the LX-PE93 inverter comprehensive tester, which realizes online uninterrupted testing under grid connected conditions. It provides professional integrated testing solutions for inverter performance evaluation, power station PR value calculation, and fault diagnosis, and widely serves market entities such as EPC engineering acceptance, third-party testing, and power station operation and maintenance enterprises. Inverter comprehensive analyzer

The LX-PE93 inverter comprehensive tester adopts non-contact current clamp sampling technology, and the biggest highlight is that it does not require the power station to shut down or cut off power. Under the normal grid connected operation of the inverter, various electrical parameter collection tests can be completed without causing power generation losses to the power station, perfectly solving the pain point of traditional detection mode that must be shut down. The equipment has an ultra wide testing range, with a DC voltage of 0-1500V, an AC line voltage of 0-1000V, and a current measurement range of 0.5A-1500A. It is perfectly compatible with mainstream string and centralized inverters in the market, covering the voltage levels of the vast majority of photovoltaic power plants at present. The instrument is equipped with 4 DC acquisition channels and 3 AC acquisition channels. It synchronously collects multiple parameters such as input and output voltage, current, active and reactive power, power factor, frequency, harmonics, and cumulative power generation through multiple channels. The accuracy of voltage testing reaches ± 0.5% rdg ± 0.2V, which can accurately capture subtle fluctuations in parameters, accurately calculate the actual conversion efficiency of the inverter, and truly restore the actual working level of the equipment on site. It is different from the nameplate parameters under ideal laboratory conditions and truly reflects the actual performance of the power station under on-site working conditions.

The equipment integrates high-precision irradiance sensors and temperature sensing units, which can synchronously collect environmental data such as solar irradiance, ambient temperature, and component backplane temperature. Combined with internal professional algorithms, it automatically completes the calculation of the power plant PR performance ratio, and analyzes the correlation between power generation data and environmental meteorological conditions to help technicians distinguish whether it is environmental factors such as lighting temperature or inverter and component equipment failures that cause a decrease in power generation, reducing misjudgment of faults. The whole machine is equipped with a 6.5-inch high-definition display screen, which allows for intuitive viewing of all real-time test data on site. The curves and values are displayed synchronously, making it convenient for staff to analyze and judge problems on site. LX-PE93 supports networking communication function, which can achieve remote synchronous control of multiple devices, as well as long-term fixed point continuous monitoring. It is suitable for two working modes: short-term on-site testing and long-term fixed-point performance monitoring. It can be used for mobile inspection or fixed deployment within the power station to continuously collect operational data. Later, monitoring data can be remotely retrieved through Ethernet to meet diverse project requirements.

The whole machine adopts a portable protective box integrated design, with clear and orderly hardware interface layout, convenient transportation and layout, and no complex installation process. After reaching the testing point, it can be quickly wired to start work. The equipment protection level is suitable for the complex environment of outdoor power stations, and can adapt to the on-site working conditions of large temperature differences and high dust in the wild. Local high-capacity storage of test data, supporting exporting report files for project acceptance archiving and fault analysis report writing. In practical business scenarios, LX-PE93 can be used for new power station grid connection acceptance inverter efficiency verification, regular performance evaluation of existing power stations, inverter fault diagnosis, and comparative testing of effects before and after technological transformation. It can be adapted to both large ground power stations and industrial and commercial distributed photovoltaic projects.

Localization is a prominent competitive advantage of LX-PE93, with independent and controllable core software and hardware. Compared with similar imported testing equipment, it has better cost-effectiveness. At the same time, relying on the LAILX localization service system, it provides customers with on-site practical training, remote technical support, and continuous firmware upgrades to solve various problems encountered during equipment use. The photovoltaic industry is rapidly iterating, high-voltage systems are becoming popular, and the demand for on-site online testing in power plants continues to grow. As the core of the system, the importance of performance evaluation of inverters is becoming increasingly prominent. The LX-PE93 inverter comprehensive tester, with its comprehensive advantages of online non-stop detection, multi-channel synchronous acquisition, intelligent calculation of PR values, and one machine for multiple uses, complements an important part of on-site photovoltaic efficiency testing, assists in the fine operation and maintenance of photovoltaic power plants, promotes the continuous upgrading of testing capabilities in the new energy industry, and contributes to the high-quality development of the photovoltaic industry with domestically produced testing equipment.

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