On December 16, the "Eighth China Industrial and Commercial Distributed Photovoltaic Conference" hosted by the China Chamber of International Commerce, Jiangsu Council for the Promotion of International Trade and Wuxi Municipal People's Government was successfully held in the Hualuxe Hotel Taihu, Wuxi. Many photovoltaic companies and industry experts attended the meeting. 

PROJOY Electric Co., Ltd. (hereinafter referred to as "Projoy Electric") was invited to attend the conference and responded to the call of the National Energy Administration to strengthen the safety of distributed photovoltaic power generation to discuss the innovation and development of distributed photovoltaic.

On the afternoon of the 16th, Mr. Gao Jianjian, Manager of Technical Support Department of Projoy Electric,focused on "Green, Healthy and Sustainable Development of Photovoltaic Ecosystem" and delivered a keynote speech on "Distributed Photovoltaic Security Issues and Solutions". 

In his speech, Manager Gao pointed out the current pain points of the photovoltaic industry: Due to favorable policies and other reasons, the photovoltaic industry is developing rapidly, the application of photovoltaic power generation is becoming more and more extensive, and the market is expanding rapidly. At the same time, product quality and installation quality are uneven, and the safety of photovoltaic power plants cannot be guaranteed.

The solar modules in the photovoltaic power station are connected in series or in parallel. As long as there is a light source to illuminate the photovoltaic modules, a high voltage of 600V~1500V will be generated on the DC side, and the DC current can be as high as 55A. In the long-term operation, problems such as poor contact of the joints, quality problems of the contacts, and aging of the insulation parts will directly cause the DC arcing phenomenon. The high temperature generated exceeds 3000 ℃, which is very easy to catch fire. Under normal circumstances, when a fire occurs in a photovoltaic power station, the grid-connected power supply will be turned off first, that is, the current from the inverter to the grid will be cut off. However, there is still high-voltage direct current in the cable between the solar module and the inverter, and there is a hidden danger of electric shock, which will pose a great threat to the personal safety of firefighters who fight fires. 

In response to this potential safety hazard, Projoy’s PEDS-PL series of component-level quick shut-offs can eliminate high voltage on the DC side in the event of a fire hazard, with high on-off capability and good arc extinguishing effect. The limit range can be reduced within 30s. The external voltage is reduced to less than 30V, and the voltage within the boundary is reduced to less than 80V (the actual measurement of the power station only takes 10s) to ensure the safety of people's lives and property. 

As early as 2014, the National Electrical Code (NEC) of the United States put forward a concept of safety protection for photovoltaic power plants, which is to quickly shut down the connection between each photovoltaic module, which is called Rapid Shutdown (RSD) in English. With the widespread application of photovoltaic power stations, countries such as Europe and the United States have successively introduced standards requiring photovoltaic power stations to install "quick shutdown fire switches". The National Energy Administration of China also issued a related notice in November, proposing that photovoltaic modules should have a safe shutdown protection function. To ensure that the inverter shuts down and the DC voltage outside the system sub-array is lower than the safe voltage after the AC power failure. 

Projoy Electric, as one of the first domestic companies to develop and produce rapid shutdown products, has a professional R&D and sales team. The cascade-level rapid shutdown developed in 2017 has occupied the European multi-country market when it was launched. It is currently located in all parts of the world. Both are widely used. The component-level rapid shutdown introduced this time has an exquisite design and simple structure. It is divided into two styles: PLC and DC24V. Each fast shutdown can be connected to 1-4 components. The maximum allowable DC input voltage is 120V, which is suitable for household use. The application market for photovoltaic power generation systems and industrial and commercial distributed power generation systems is more extensive. 

In the top ten distributed photovoltaic awards ceremony held at the same time on the 16th, Projoy Electric was awarded the "2021 Photovoltaic Energy Storage Accessories" for its rich experience and strong strength in products such as DC isolation switches, energy storage micro-breaks, and photovoltaic rapid shutdown. "Brand with the most investment value in the field" award. This award reflects Projoy’s brand value, shows that Projoy’s products have broad development prospects, and is highly recognized by industry experts on Projoy Electric. 

From now on, Projoy Electric will continue to deepen the needs of the industry, continue to carry out technological innovation, provide users with safe and intelligent solutions, and help the green and sustainable development of the photovoltaic industry.