In response to the current development trend of 1500V photovoltaic power generation technology and related accessories market demand, Guangzhou Jinshengyang Technology Co., Ltd. has ingeniously developed and introduced its matching PVxx-29Bxx series power supply, which can directly take power from the 1500V high voltage terminal to power the monitoring circuit of the photovoltaic system. , Simplify the design of the photovoltaic system circuit, you can avoid the construction and maintenance costs caused by the use of mains or battery power supply to increase the overall efficiency of photovoltaic power generation system. This product has multiple protection functions to further improve the safety performance of the power supply and its load when the power supply module or external circuit operates abnormally. I. Introduction At the Paris Climate Conference in 2015, a new "low-carbon emission reduction agreement" that is legally binding and applicable to all parties was reached under the UN Framework Convention on Climate Change to further promote the development of green and new energy sources such as photovoltaics and wind power. universal. In 2015, China adopted the “Thirteenth Five-Year Plan for Economic and Social Developmentâ€, in which the photovoltaic power generation market will continue to grow and the initial planned installation target will reach 150 million kilowatts. The internal and external policies, the guidance and support of demand, and the development of energy internet of things, make photovoltaic power generation more scalable and intelligent, which will help reduce the cost of photovoltaic power generation and promote technological innovation and industrial upgrading. The development goal of the global photovoltaic industry is to compete with traditional electricity to provide clean energy of lower cost and higher yield. The current mainstream photovoltaic power generation system is designed and constructed based on a 1000V DC segment voltage, but from a system point of view, if there is a higher input and output voltage level, the AC-DC side loss and the transformer low-voltage side winding loss can be reduced. The expected system efficiency can be increased by 1.5-2%. GTM's analysis report “1500V Photovoltaic Systems and Components for 2016-2022: Costs, Suppliers and Expectations†estimates that the global demand for 1500V PV systems will account for around 9% in 2016, which is equivalent to approximately 4.6GW. Therefore, the 1500V photovoltaic power generation system is bound to be the future development trend. Second, the basic structure and component requirements of photovoltaic power generation system In the solar photovoltaic power generation system, in order to reduce the connection between the photovoltaic cell array and the inverter, photovoltaic arrays are constructed in the form of strings, and the corresponding number of photovoltaic arrays are connected in parallel to the photovoltaic convergence box for power convergence and output through the DC cabinet. For photovoltaic inverters, they are integrated into the power grid after reverse voltage boosting. Therefore, the complete photovoltaic power generation system includes photovoltaic array groups, photovoltaic combiner boxes, DC cabinets, photovoltaic inverters, and step-up transformers. As shown in Figure 1: Different regions and seasons have different illumination intensities, and the degree of sunlight in the morning and in the evening is also different. The output voltage of the PV array is a large fluctuation in the highest voltage range of the system. The PV combiner box needs to monitor the voltage, current, power, and lightning protection status of each group of PV arrays, and realize functions such as fault alarm, positioning, and communication of the PV array. PV inverters need to monitor the voltage, current, etc. of the conversion process during the AC/DC conversion of the energy, and drive and control the operation of the power device. Because the output voltage of the photovoltaic array is up to 1kV or more, the normal module power supply cannot be powered directly from the high voltage line. If an external independent power supply is used to power the monitoring units such as multiple PV combiner boxes and inverters, the operating voltage is unstable and the system cabling The problem that the short circuit fault of a single combiner box will cause the entire monitoring system to stop supplying power. Therefore, the photovoltaic power generation system has the following requirements for the module power supply: • 200-1500VDC voltage input, output 12V/15V/24V and other conventional voltage • High isolation voltage characteristics between input and output • With input undervoltage, reverse connection and other protection, with output overcurrent, short circuit, overvoltage and other protection functions • To meet extreme operating temperature requirements in different locations For the high voltage characteristics and application requirements of photovoltaic power generation systems, Guangzhou Jinshengyang Technology Co., Ltd. has specially developed a 200-1500VDC voltage input, 4000VAC isolated module power supply, and combines the safety and isolation characteristics of each unit circuit of the photovoltaic system to provide a complete set of control units. Power scheme. Third, the photovoltaic combiner box monitoring unit power solution In order to further improve the reliability and practicality of the system, PV-specific DC lightning protection modules, DC fuses and circuit breakers are deployed in the PV combiner box, and functional circuits such as working status monitoring, control processing, and communication are set up. As shown in Figure 2, in the PV combiner box system, PVxx-29B24 series has 200-1500VDC voltage input, 4000VAC isolation voltage, high reliability characteristics, can directly take power from the high voltage side, convert the output 24VDC voltage to the monitoring circuit powered by. Use F0505S-1WR2 to isolate Hall sensor power supply, fully ensure the safe isolation between high voltage and low voltage; Use B0503XT-2WR2 module to isolate and convert and output 3.3V to supply power to MCU; Use TD501D485H communication module with integrated isolated power supply to suppress electromagnetic interference And eliminate ground loop effects. The overall power supply solution meets functional requirements and safety isolation, while at the same time it facilitates the simplified design and stability of the overall system. Fourth, photovoltaic inverter monitoring unit power solution In the front-end junction box for power convergence, detected by the DC cabinet, the steering inverter for DC conversion into AC. In the work process of the inverter, it is also necessary to convert the process monitoring, control and communication to ensure that the inverter voltage meets the requirements of the indicator. This part of the monitoring unit can take power directly from the high voltage (200-1500VDC) bus. As shown in Fig. 3, the PV series module power supply directly converts and outputs 24V from the high-voltage bus, and then outputs a 5VDC voltage through the non-isolated conversion module K7805-500R3; B0503XT-2WR2 provides the MCU with a 3.3V operation that meets the functional isolation and voltage withstand requirements. Voltage; The use of isolated, high-speed TD501D485H communication module, can suppress electromagnetic interference and eliminate ground loops, protect the system circuit from external networks; In addition, Jin Shengyang developed an integrated DC-DC power supply specifically for the inverter full-bridge IGBT The isolated driver QP12W08S-37 simplifies the design of the customer's drive control circuit and improves reliability. V. Introduction to PVxx-29Bxx Series Module Power Supply PVxx-29Bxx series is 200-1500VDC voltage input, 4000VAC isolation voltage, high reliability DC-DC switching power supply module, can be widely used in photovoltaic power generation and high voltage frequency conversion and other occasions, to provide a stable working voltage for load equipment, and its The built-in multiple protection function can improve the safety performance of the power supply and its load under abnormal power supply operation of the module. Features: • Ultra wide voltage range input: 200 ~ 1500VDC • Industrial working temperature: -40°C ~ +70°C • 4000VAC high isolation voltage • High efficiency, low ripple noise • Input undervoltage protection, reverse polarity protection, output short circuit, overcurrent, overvoltage protection • 5000m high altitude work • Complies with EN62109 certification • PCB, wiring and rail type and other installation methods PVxx-29Bxx series power supply block diagram shown in Figure 5, the use of flyback topology, select mature and reliable PWM control IC, power conversion circuit for high-voltage dual-tube series form and isolated drive design, high pressure start part of the use of gold Shengyang high pressure The patented technology is started, and the product has multiple protection circuits such as input under-voltage, output over-current, short-circuit over-voltage and so on, so as to achieve high reliability of the product. Sixth, summary The gradual scale and popularization of photovoltaic energy is the trend of healthy and rational development of global energy demand for the future. Jin Shengyang actively participates in the development of green energy technology, combines its own technological platform advantages and independent innovation capabilities, and meticulously researches and develops a new generation of PVxx_29Bxx series of 1500V high voltage photovoltaic dedicated power modules for the characteristic requirements of test and monitoring units for photovoltaic power generation systems. The unit power application scheme simplifies the circuit scheme of the photovoltaic power generation system, reduces the construction and maintenance costs of the photovoltaic system, and comprehensively enhances the stability, safety, and reliability of the system.
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