Shulou(Shulou.com)11/24 Report--

CTOnews.com, December 23, Huawei recently held a press conference on the top ten trends of smart photovoltaic for the industry. With the increasing proportion of new energy represented by photovoltaic, how to continuously reduce the kilowatt-hour cost of the optical storage system, improve the efficiency of operation and maintenance, enhance the capacity of the power grid to absorb new energy while maintaining the stability of the power grid, and ensuring end-to-end system security has become a key problem faced by the industry.

Trend-optical storage generator

With the continuous improvement of the proportion of new energy, it has brought an impact on the power grid, making it face a variety of complex technical problems, such as system stability, power balance, power quality and so on. Therefore, changing the new energy control mode, improving the control and response ability of active and reactive power, actively alleviating frequency and voltage fluctuations, and making photovoltaic power generation from Grid Following to Grid Forming will become important measures to solve the problem of photovoltaic grid-connected elimination. Through the optical storage fusion + Grid Forming technology, an intelligent optical storage generator is built, which changes the control logic of new energy from current source control to voltage source control, and has the ability of strong inertia support, instantaneous voltage stabilization and fault crossing, so that photovoltaic power generation can adapt to the power grid and accelerate photovoltaic to become the main energy.

Trend 2: high density and high reliability

The development of photovoltaic power stations to high power and high reliability has become a trend. Take the photovoltaic inverter as an example, the DC voltage has been raised from 1100V to 1500V. Through the application of new materials such as silicon carbide and gallium nitride, and the full combination of digital technology with power electronics technology and thermal management technology, it is expected that in the next five years, the power density of the inverter will be increased by another 50%, while ensuring the high reliability of the equipment.

Trend three-component Power Electronics (MLPE)

Component-level power electronic devices (Module-Level Power Electronics, MLPE) refer to power electronic devices that can finely control single or several photovoltaic modules in photovoltaic systems, including miniature inverters, power optimizers and switches. Component-level power generation, monitoring and safety shutdown are its unique value. CTOnews.com has learned that the penetration of MLPE in the distributed market is expected to increase to 20 per cent by 2027 as photovoltaic systems become more secure and intelligent.

Trend four groups of series energy storage

Compared with the traditional centralized energy storage solution, the intelligent group series energy storage solution combines digital information technology with photovoltaic and energy storage technology across borders, and is based on the architecture of distributed energy storage system. Innovative technologies such as battery module level energy optimization, battery single cluster energy control, digital intelligent management and full modular design are adopted. Realize the value of higher discharge, better investment, simple operation and maintenance, safety and reliability in the whole life cycle of the energy storage system. It has three characteristics: group series, intelligence and modularization.

Aiming at the application scenarios of customer power grid frequency modulation and rotary reserve, the intelligent group series energy storage can achieve constant power output for a longer time and ensure the benefit of frequency modulation through fine charge and discharge management. At the same time, the battery pack-level automatic SOC calibration function can save manpower costs and greatly improve the efficiency of operation and maintenance.

Trend 5 fine management at the core level

Just as photovoltaic systems develop to component-level power electronics (MLPE), lithium battery energy storage systems are bound to move towards smaller management granularity. Only by carrying out fine management for the battery can we deal with the problems of efficiency and safety more effectively. At present, the traditional end-to-side BMS can only summarize and simply analyze the limited data, and it is almost impossible to achieve early fault detection and early warning. Therefore, it is necessary to make BMS (Battery Management System) "more sensitive", "smarter", and even "predict the future", which depends on the collection and processing of a large amount of data, combined with AI technology to find the best and predict the trend.

Trend 6 "Optical Storage Network" Integration

In the power generation side, the construction of optical storage clean energy base, the use of UHV to send to the load center has become a trend. On the power side, the construction of virtual power plant (VPP) combines massive distributed photovoltaic system, energy storage and controllable load, flexible dispatching of decentralized power generation units and storage units, and the realization of power grid peak cutting and valley filling has also begun to land in many countries.

Therefore, building a stable energy system with the integration of "optical storage network" and supporting photovoltaic transmission and consumption will become the key measure to solve the problem of energy security and energy independence. Through the integration of digital technology, power electronics technology and energy storage technology, multi-energy complementarity and coordination can be realized. With the application of 5G, AI and cloud technology, the massive distributed optical storage system can be intelligently managed, operated and traded, and the VPP virtual power plant can be constructed, which can provide a strong technical guarantee for the user-side adjustable resources to participate in the market transaction and load-side response, and for the power grid to cut peak and fill valley.

Trend 7 to reconstruct the ultimate security

Optical storage security is the cornerstone of industrial development, which needs to be considered systematically from the point of view of the whole scene and the whole link, and fully integrate power electronic technology, electrochemical technology, thermal management technology and digital technology to reconstruct the ultimate security of the system.

In the photovoltaic power station scene, according to statistics, the faults caused by the DC side can account for more than 70% of all faults, the inverter needs to have intelligent string segmentation and terminal automatic detection function; in the distributed photovoltaic scene, the arc fault automatic circuit opening function AFCI will become standard, component-level fast turn-off function will bring safety to maintenance and firefighters. In the energy storage scene, it is necessary to combine a variety of technologies such as power electronics, cloud and AI to finely manage the energy storage products from the cell to the system, changing from the traditional protection mode based on passive response and physical isolation to active automatic protection, or even predicting alarm in advance, so as to realize the multi-dimensional security design from hardware to software, from structure to algorithm.

Trend 8 Security and credibility

Photovoltaic system not only brings benefits, but also contains a variety of security risks, including equipment security and information security. The hidden danger of equipment security mainly refers to the downtime caused by equipment failure, and the hidden danger of information security refers to the network attack from the outside. In order to deal with these challenges and threats, enterprises and organizations need to establish a set of "secure and reliable" management mechanisms, including the reliability, availability, security and resilience of systems and equipment. Photovoltaic power station systems also need to pay attention to the protection of personal and environmental harmlessness and data privacy.

Trend 9 all-round digitization

The traditional photovoltaic power station has a large number of equipment, lack of information collection and reporting channels, basically belong to "dumb" equipment, and the power station is an "isolated island" type of power station, which does not have the ability of cooperation. the management of the power station is also in the original "extensive" management.

With the introduction of advanced digital technologies such as 5G, Internet of things, cloud computing, sensing technology and big data, traditional photovoltaic power stations can become power stations that can "talk" and are good at "expression". The purpose of managing "watts" with "bits" can be achieved, and the whole link of "generation-transmission-storage-distribution-use" can be visible, manageable and controllable. At present, many photovoltaic power stations around the world are undergoing digital transformation, and it is estimated that more than 95% of the photovoltaic power stations will be fully digitized by 2027.

Trend 10 AI efficiency

AI technology can be widely used in the field of new energy with strong fluctuation and high uncertainty, and plays an irreplaceable role in the whole life cycle of optical storage, such as manufacturing, construction, operation and maintenance, optimization, operation and so on. The integration of AI with cloud computing, big data and other supporting technologies is deepening, and the tool chains around data processing, model training, deployment operations and security monitoring will continue to be enriched. In the field of new energy, AI, like power electronics and digital technology, will bring about profound changes in the whole industry.

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