"In addition to high efficiency and high yield, what else is indispensable for photovoltaic power plants?"
"Safety!"
From large-scale ground power stations to today's distributed small power stations, photovoltaics are getting closer and closer to people's lives. The explosion of distributed photovoltaics in 17 years also marked the formal development of photovoltaics into a practical life product.
Whether the power station is highly efficient and profitable is the most concerned issue for every photovoltaic owner / investor, but at the same time, many people will pay attention to a most basic but easily overlooked issue: safety.
Unlike large-scale ground-mounted power plants that are independently occupied, distributed photovoltaic power generation needs to be attached to residential houses, industrial plants, warehouses, commercial buildings, school municipal buildings, etc., and these building carriers are generally densely populated and equipped with related precision instruments and equipment Or the characteristics of flammable substances are stored, so the safety performance requirements of distributed photovoltaic power generation are more strict. It must be ensured that photovoltaic power generation does not affect the original production and living functions of these buildings, and does not cause hidden safety hazards to personnel, production, and materials .
In terms of security, let ’s first look at the regulations of various countries:
· In the United States, the Fire Protection Association revised the national electrical code: "In residential photovoltaic power generation systems, when an emergency occurs, after the AC grid-connected terminal of the photovoltaic system is disconnected, the maximum DC terminal voltage cannot exceed 80 volts.
· In Italy, firefighters cannot carry out fire fighting work when the building is under voltage.
· Germany, the first to implement the VDE fire safety standard, clearly stipulating that a DC cut-off device needs to be added between the inverter and the components in the photovoltaic system.
· In Australia, according to the OVE R11-1: 2013 specification, there must be a circuit breaker near the component.
Obviously, the world's first consideration for the safety of photovoltaic power plants is the high-voltage DC in the system. High-voltage DC not only affects the rescue work, but also is one of the main causes of fire (high-voltage DC arc drawing). Therefore, in foreign countries, the micro-inverter with a DC side voltage of only about 40V has become incense.
The safety of the micro inverter is not only reflected in the low voltage of 40V. As we all know, the industry defines the operation life cycle of photovoltaic power stations as 25 years. To ensure stable power generation for 25 years, the quality, safety, operation and maintenance of the power station are indispensable. The micro-inverter has component-level monitoring, and the operating status of each component can be observed in real time within a 25-year operating cycle. If a safety failure occurs, it will be fed back on the big data monitoring platform at the first time, while ensuring power generation efficiency Improve the security of the entire system.
Regulating valve is a fluid control device, it can control fluid flow, pressure, temperature and other parameters, in order to achieve the purpose of regulating fluid flow characteristics. It is composed of a piston or ball spool, in which there is a manual or electric mechanism with adjustment function, it can control the position of the piston or ball spool, so as to change the pressure and flow rate in the valve, so as to adjust the flow characteristics of the fluid.
The main function of the regulating valve is to adjust the flow rate, pressure and temperature, so that the fluid flow characteristics are more stable, so as to improve the efficiency of the fluid. It can regulate the flow of fluid to keep it at a low level, thus saving energy; The pressure of the fluid can also be adjusted to keep it at a low level, thus reducing noise in the piping system; The temperature of the fluid can also be adjusted to keep it at a low level, thus preventing condensation in the piping system, etc.
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