'The standard power of the components we use is 270w, the screen shows the yellow part, the operating power is below 60%, the blue is within the 60%-80% range, and over 80% is displayed in green. Such monitoring Visualize the operation status of the power station and make the diagnosis more efficient. It is very helpful for the financial stability of the project as a whole. ' Zhou Jin, head of distributed photovoltaic business of Siemens (China), showed the reporter that Suzhou Siemens Electronics Co., Ltd., which had just been put into operation in March of this year, The company's (SEAL) plant rooftop photovoltaic project monitoring system. Unlike the widely used inverter monitoring, the component monitoring of the SEAL pilot project is moving the power plant on the roof to the visible software screen.
The SEAL rooftop photovoltaic project occupies three concrete roofs of the plant, with a total installed capacity of 1.04 MW. A total of 3,860 polysilicon modules are used. According to the staff, the number of components participating in the digital experiment is 220, involving a capacity of 60 kilowatts.
'We have installed a small module on these 220 pieces of components to provide DC side protection from a security perspective, and more importantly, based on the concept of the Internet of Things, let each device be digitized.' Zhou Jin told reporters, through a The small module can transmit the voltage, current and power of each photovoltaic panel to the background in real-time. 'So we can check the working status of these 220 components at any time, more accurate than the current domestic inverter monitoring.'
'This is a group of more than a dozen photovoltaic panels, in fact, can clearly see the individual components are different, the output voltage, current, power inconsistency can be reflected. ' Zhou Jin told reporters, combined with the background data Analysis, can easily know whether a component's key operating indicators are within the warranty provided by the manufacturer, whether there are potential safety risks and risks. In the same perspective, you can find the advantages and disadvantages of the installation process.
'Every piece of the device is digitalized, and it can communicate and manage. This amount of data is almost ten times of the equivalent installed capacity in China. With the support of huge data, component level monitoring, diagnosis and remote transport can be carried out. Dimensions, determine the attenuation characteristics of components, perform preventative maintenance, and can even play a role in the evaluation of assets throughout the plant.
Zhou Jin believes that the future component monitoring and inverter monitoring can be fully complementary. 'The inverter has its own monitoring advantages, through the connection box connection, there are many functions of fault diagnosis. The component level monitoring is more meticulous. Investors and owners are now paying attention to the operational efficiency of PV modules. The stability, safety, and component level monitoring of power plants are actually the source of accidents captured through digital technology. Once an inverter alarms, it can be monitored and located by the component. malfunction. '
Talking about the promotion after the pilot, Zhou Jin disclosed that it is currently cooperating with some domestic manufacturers, 'digital components should be truly available and widely used by the end of the year'. Moreover, in addition to the existing voltage, current, and power In addition to the data output and remote control of the indicator, the new product also adds temperature monitoring. 'The most immediate benefit is the early detection of fire hazards through changes in the component's temperature, which is very important for rooftop PV projects, and the owners have a strong demand for it. . '
Regarding the issue of costs, Zhou Jin pointed out that if the plug-in module is adopted, the one-time investment cost increase by the use of financial leasing will be about 4%. 'But if the scale is reached, the cost may only increase by 1% through the built-in digital chip. To 2%. '
