The state proposes to achieve the “dual carbon” goals of “carbon peaking” and “carbon neutrality” in 2030 and 2060, respectively. The “dual carbon” path will shift from “energy dual control” to “carbon emission dual control” to optimize the energy structure. , and improve energy efficiency by building a new power system with new energy as the main body. New energy power generation mainly includes solar power, wind power, hydropower and nuclear power. With the continuous advancement of technology, the cost of power generation has been effectively reduced. Benefiting from this, the installed capacity and power generation of solar power have grown rapidly.
Solar power generation system, namely photovoltaic inverter system. Compared with traditional energy, solar energy still has a significant gap in the support capacity of the power grid. As a flexible resource, energy storage technology can provide frequency regulation, peak regulation and other services for the power system. , to achieve an important support for the coordinated development of the source network, and help new energy adapt to the power grid.
Figure 1 below is a typical application block diagram of the current photovoltaic inverter system + energy storage system. The DC arc detection module (ACFI) provides the DC arc detection function to avoid electrical fires, electric shocks and lightning strikes caused by arcing in the entire system; the maximum power tracking module (MPPT) achieves the maximum efficiency of solar panel power generation; the bidirectional inverter module provides DC/ AC conversion, convert the DC power converted by MPPT into AC power again, or convert the AC AC power into the DC power required by the energy storage battery to realize peak shift and flat valley; bidirectional DC/DC realizes the mutual conversion of battery DC voltage and high-voltage DC, so as to realize The two-way function of photovoltaic storage flat valley and staggered peak power generation.
Figure 1: Block diagram of a typical photovoltaic inverter and energy storage system
Figure 2 below is a typical block diagram of the MPPT & Inverter & CommunicaTIon module. Siruipu’s high-performance and high-reliability analog devices, such as operational amplifiers, comparators, analog switches, etc., can be used for V/I and other analog signal sampling and fast protection of modules; digital isolators, CAN, RS485, etc. can provide isolation, Non-isolated industrial field bus communication; power reference, watchdog and reset chip, etc. can provide a stable reference source for the system and can be used for system protection against abnormal conditions.
Figure 2: Typical block diagram of MPPT & Inverter & CommunicaTIon module
Figure 3 below is a typical power tree block diagram. Siruipu can provide rich DCDC, LDO and other power supply solutions to meet the power supply requirements of different modules of the system.
Figure 3: Power Tree Block Diagram
DC arc detection module ACFI
Figure 4 below is a block diagram of a typical DC arc detection ACFI module. Through the sampling of voltage, current, temperature and other information, the arc state is obtained by comparing with the arc characteristic value, and the arc detection function is realized through the communication with the external module. Siruipu’s high-performance ADCs and operational amplifiers can realize accurate arc electrical characteristics detection, and can isolate CAN, isolation 485, digital isolators, etc. to help achieve isolation communication requirements.
Figure 4: DC arc detection ACFI block diagram
Battery bidirectional charge and discharge (bidirectional DCDC) module
Figure 5 is a block diagram of a typical bidirectional DCDC module. Siripu’s high-performance operational amplifiers and comparators can achieve accurate V/I and other analog signal sampling and fast protection, and achieve power conversion requirements; isolation CAN, isolation 485, digital isolators and CAN, RS485, RS232 can meet the communication requirements inside and outside the system according to different combinations of practical applications.
Figure 5: Bidirectional DCDC Block Diagram
The BMS module can collect the voltage, current, temperature, power, and leakage signals of the energy storage battery, provide corresponding protection functions for the battery pack, and provide the function of communicating with the outside world. A typical block diagram is shown in Figure 6.
Figure 6: BMS block diagram
SRIP’s product recommendations for each solution module
3PEAK, a semiconductor company focusing on high-performance analog chips and embedded processors, provides the market with a wide range of high-performance and high-reliability products through continuous technological innovation and precipitation, meeting the needs of a complete set of photovoltaic inverters and storage systems. It provides key technical support for the solution to achieve the best performance, helps achieve the “dual carbon” goal, and promotes high-quality and sustainable development.
Reviewing Editor: Tang Zihong