① Green energy

The 1992 "United Nations Framework Convention on Climate Change", the 1997 "Kyoto Protocol" and the 2015 "Paris Agreement" are the three major international conventions on climate change in human history, and have reached consensus on energy conservation and environmental protection.

Photovoltaic power generation is a green low-carbon lifestyle. In recent years, the global photovoltaic power generation system devices have shown a trend of increasing year by year. In 2016, the global photovoltaic installed capacity reached 300GW. China's total installed capacity is 77.42GW, followed by Japan, the United States and Germany. By 2050, photovoltaic power generation will reach 50% of global power generation. The number of new global solar power stations has increased significantly.
Usually, solar panels are connected in series to generate the required voltage and form a "PV module" of several megawatts of power, which is then integrated into the grid. All PV modules can be connected in parallel with multiplexed inverters. A solar power station needs thousands of solar panels, and engineers must monitor the performance of the entire equipment to ensure the safe and efficient operation of the photovoltaic system.

A solar power station needs thousands of solar panels. It is necessary to monitor the performance of the entire equipment and track whether the photovoltaic group reaches the high power point (MPP) to ensure the overall efficiency of the photovoltaic system. The photovoltaic system includes photovoltaic modules, combiner box and grid-connected inverter. Each component needs to monitor current and voltage to evaluate the efficiency and safety of the system. When multiple PV modules are connected to the inverter in parallel through the intelligent combiner box, the working status of the PV module can be effectively monitored by detecting the working current of each PV module, and the real-time tracking of the PV module to the photovoltaic system through the current sensor can be obtained to achieve the system monitoring and protection purposes.

 

Under the influence of the global energy crisis, and solar energy with its unparalleled superiority. It has become one of the main options for people to lift the energy crisis. Grid-connected photovoltaic power generation is now an important way for people to use solar energy. Traditional centralised grid-connected PV systems consist of a number of closely connected solar panels. These panels are first connected in series in groups and then connected in parallel to form a PV array. The DC power generated by the array flows to a centralised grid-connected inverter located next to the panels, which completes the DC/AC conversion and connects to the grid and finds the maximum power tracking point to optimise the efficiency of the grid-connected PV system. As the technology matures and evolves, the problems of centralised grid-connected PV systems are becoming a concern.
 

Energy storage has been driven by both policy support and improved economics, and has seen an accelerated explosion in the last two years.

 

(1) Policy, the United States, Portugal, Japan and other overseas countries have issued a number of policies and documents to support the development of energy storage business, on the one hand, for energy storage projects issued a certain amount of subsidies, on the other hand, regulate the development of the industry, relax the industry access to the field and so on.

(2) Economically, along with the advancement of battery technology and cost reduction, the cost of electricity for energy storage has dropped significantly. We expect the cost of electricity for energy storage systems to drop from RMB1.78 in 2019 to RMB1.16 in 2025. In the long term, after the removal of energy storage subsidies, the economic improvement of energy storage systems is the core to support the long-term growth of energy storage demand.

The high growth rate of energy storage business can be maintained in the long term. The global household energy storage market is over 2,000 GWh, with global energy storage shipments of only 20 GWh in 2020.