A large number of photovoltaic inverters connected to the power grid can cause a series of power quality problems such as harmonic distortion, voltage fluctuations, frequency offset, and three-phase imbalance. If the power quality does not meet the standards, it will not only cause abnormal disconnection of inverters and increased equipment losses, but also seriously impact the public network and fail to meet the requirements of grid connection standards. Power quality testing is the core link in the grid connection acceptance and later fault diagnosis of photovoltaic power plants. Traditional large desktop equipment is inconvenient to move, and ordinary multimeters cannot capture transient anomalies such as harmonics and transient fluctuations, making it difficult to fully evaluate the grid connection conditions. Jiangsu Jingwei JW-DZ65 portable power quality analyzer is developed for photovoltaic grid connected scenarios, with multi-channel synchronous high-speed sampling to fully capture various power parameters on the grid connected side, providing professional testing methods for photovoltaic power station grid connected acceptance, fault diagnosis, and power quality evaluation. Online detection device for power grid
The JW-DZ65 power quality analyzer adopts a multi-channel synchronous high-speed sampling architecture and is equipped with a high-precision signal acquisition unit. It can real-time collect and record a large number of power quality indicators such as voltage, current, power, power factor, grid frequency, harmonic distortion rate, three-phase imbalance, voltage sag and sag, and fully restore the real working conditions during the interaction between photovoltaic inverters and the grid. Relying on built-in professional analysis algorithms, the equipment can automatically identify various types of power quality abnormalities such as harmonic exceedance, voltage exceeding limits, power anomalies, three-phase imbalance, etc., mark the occurrence time, duration, and magnitude of the abnormalities, help technicians locate the source of the fault, distinguish whether the problem comes from the inverter body or the grid side, change the previous working mode of relying on experience to guess the fault point, and greatly improve the efficiency of grid connected fault investigation.
The equipment has two working modes: on-site inspection and long-term fixed-point monitoring. At the hardware level, it fully considers the outdoor station usage environment, industrial grade protective body, wide temperature working range, and adapts to the complex environment of the station site. Equipped with an outdoor high brightness touch screen, it allows for intuitive viewing of waveforms, spectra, and trend curves on site. The device has strong battery life and can be used for short-term mobile inspections and testing of each inverter. It can also be continuously monitored by hanging on the grid for a long time, fully recording the changes in grid connected electricity for the whole day. The instrument has rich expansion interfaces, supports local storage and data export, and has built-in report templates that comply with industry standards. After testing is completed, it can generate a power quality assessment report with one click, including statistical data, waveform diagrams, and records of over limit events. It directly meets the needs of grid acceptance and third-party testing report output, saving a lot of time for manual data organization and chart drawing, and improving the efficiency of on-site testing work.
This device is widely used in multiple business processes of photovoltaic projects. During the acceptance stage of the new power station's grid connection, a comprehensive power quality test shall be conducted in accordance with the grid connection standards to verify whether the grid connection indicators of the power station meet the grid specifications, which is an important component of the grid connection data; During the operation and maintenance phase of the power station, when encountering faults such as frequent disconnection of inverters, abnormal power generation, and high equipment heat loss, on-site testing should be carried out to locate the root causes of harmonic and voltage disturbances, and guide technical personnel to carry out rectification and optimization; It can also be used for the development and factory testing of inverter products, detecting the grid performance of inverters under different operating conditions, and assisting in product iteration optimization. The JW-DZ65 is capable of performing detection work in scenarios such as ground centralized photovoltaics, industrial and commercial distributed photovoltaics, and energy storage grid point detection.
In the context of the construction of a new power system and the large-scale integration of distributed new energy into the grid, the power quality control of photovoltaic power plants by the power grid is becoming increasingly strict, and power quality testing has become an essential part of power plant operation. In the past, many projects were limited by equipment conditions, making it difficult to complete comprehensive and detailed grid connected testing. The JW-DZ65 portable power quality analyzer brings laboratory level analysis capabilities to the site, balancing portability, sampling accuracy, and automated reporting capabilities, and reducing the threshold for on-site power quality testing. Jiangsu Jingwei Technology focuses on the new energy testing track, deeply explores the real pain points of photovoltaic grid connected testing, and continues to polish domestic testing equipment. With the continuous expansion of new energy installed capacity and the increasing demand for grid monitoring, the JW-DZ65 power quality analyzer will continue to play its value, helping photovoltaic power plants meet grid standards, reducing equipment failure losses, ensuring safe and stable grid connected power generation, and providing reliable detection technology support for the construction of new power systems.
Online power grid detector, power quality tester, portable PE detector
