The function of photovoltaic combiner box.
The equipment in the management system of solar power plants is generally installed outdoors. When the outdoor temperature is high, the temperature inside the distribution box will be higher, which will simultaneously endanger the current and working temperature of the circuit breaker. Therefore, temperature is the primary consideration in the use of circuit breakers in the management system of solar power plants.
The professional independent innovation capability of "intelligent system string breaking" lies in introducing circuit breakers with "electronic components" used for high-end machinery and equipment into the maintenance and upkeep of solar power generation string backflow and common internal problems of photovoltaic inverters, greatly improving reliability and solving industry confusion.
We strongly recommend using a simple speed algorithm with a relatively large component error value to calculate the total current of photovoltaic circuit breakers. Based on the results of a slow tracking survey since 2016, 130% of the work experience volume scheme designs are zero boundary points, which can easily lead to safety accidents such as false tripping.
(1) Conduct professional research on the suppression of overvoltage caused by the switching of high-voltage side circuit breakers in the sub array power transformers of solar power plants, and conduct simulation analysis on the basic principles of overvoltage caused by rapid grid shutdown of solar power plants. Apply simulation to find methods to suppress overvoltage during the operation of circuit breakers.
For large, medium, and small solar power generation systems with multiple variable frequency power sources, the distribution box is usually installed with many circuit breakers in close proximity. During operation, these circuit breakers can quickly overheat and cause harm to each other, which may lead to premature tripping.
Customers can connect a certain number of photovoltaic modules with the same specifications according to the range of AC current input by the variable frequency power supply to form one photovoltaic module series, and then connect several series to the lightning protection combiner box of the solar power plant (see Figure 1) for current collection. Based on the power lightning arrester and circuit breaker, the output is convenient and fast for connecting the variable frequency power supply afterwards.
The important role of the APV product series intelligent system solar power station combiner box is to conduct first level current collection for the solar panel array. In addition to providing current collection and lightning protection functions, the APV product series intelligent system solar power station combiner box also has the functions of accurately measuring the total current of the string, inspecting the operating status of the components in the solar power station array, component working standard voltage, total current collection power, ring road power, collecting the status of the combiner box power lightning arrester, collecting the status of the DC power circuit breaker, relay contact point output, and wind speed, temperature, radiation intensity meter, etc.
Function: AGF-T perforated solar power station current collection machine equipment is a technical professional applied to intelligent system solar power station combiner boxes. It is used to inspect the operation status of solar panels in the discharge tube array, accurately measure the total current of the string, collect the status of power lightning arresters and DC power circuit breakers in the combiner box, and the machine equipment has RS485 sockets to submit accurate measurement and collected messages and mechanical equipment status.
When the common problem of shutting down the power supply occurs on the local side of the solar power station, it is necessary for the operation staff to search for difficult points. If the power distribution equipment connected to the other side of the station is still plugged in, it will cause the other side of the station to reverse the power to the solar power station, posing a safety hazard to the operation staff on the local website. In the event of a side station shutdown, it is necessary for the internal operation and maintenance service staff of the other website to search for safety production accident points. If the solar power station is still closing normally at this time, it is easy to cause a non targeted islanding effect, posing a threat to the safety factor of the operation staff in the other website. The anti island maintenance facilities configured are fully utilized at this time. In the event of a power outage on either side of the distribution network or the solar power station, the anti island maintenance machinery and equipment will quickly send a power shutdown signal to the grid connected circuit breaker, causing the circuit breaker to close, thereby efficiently ensuring the safety of maintenance workers on both sides of the solar power station
