Energy storage, photovoltaics, and electric vehicles are being regarded as the golden triangle of the new energy track. Driven by the double drive of policy superposition and demand, the trillion-dollar energy storage market has surfaced. At present, the huge market space for energy storage is gradually released. With the support of policies, markets and capital, many companies such as top 10 energy storage lithium battery companies are accelerating their influx, especially for energy storage system integration.
1. Crack the dilemma of energy storage system integration
In the early stage of the development of the new energy storage industry, some enterprises lacking core technologies were attracted to enter the industry by policies and subsidies, and irregularities and unprofessionalism led to safety problems from time to time, and even caused personal casualties and property losses. According to incomplete statistics, since 2018, a total of 34 electrochemical energy storage safety accidents have occurred around the world. Among them, the LG as one of the top 10 lithium battery companies in the world series energy storage power station and Beijing Dahongmen and other energy storage power stations caught fire, all of which shocked the industry inside and outside.
A closer look at the reasons shows that the energy storage system has extensive battery status monitoring and lack of early warning for thermal runaway of the cells. The linkage protection of BMS, PCS, EMS, etc. is insufficient. Fire protection is designed as a decoration, and safety problems are prominent, all of which make the development of energy storage in a difficult situation. Secondly, there are still some energy storage systems where the discharge capacity does not meet the standard, the auxiliary power consumption is large, and the responsibility of the operation and maintenance party is unclear, which leads to the high LCOS of the energy storage system.
However, due to the insufficiency of system functions in the early stage and the difficulty of retrofitting in the later stage, the energy storage system in the later stage has problems such as difficulty in connecting to the grid, not responding to the grid, and unstable operation causing downtime. In addition to the problematic energy storage system itself, with the continuous increase in the proportion of new energy sources, energy storage has ushered in another big test. The power grid that joins new energy sources is becoming more and more complex and unpredictable, and the requirements for energy storage systems are constantly increasing. For example, higher response speed, more intelligent prediction, etc. are required.
However, the efficiency improvement of a single point of the traditional assembled energy storage system is unsustainable, so how to deal with the power grid in the future is still a test. With the issuance of relevant documents for the development of new energy storage, the business model, market mechanism, and safety standards of energy storage have become sound, and the main players of the energy storage market have gradually paid attention to the value of safety, stability, and profitability throughout the life cycle. At the same time, the industry has begun to re-examine the importance of energy storage system integration expertise, and has gradually realized the safety, efficiency, and reliability of energy storage—not by simply stacking devices.
2. Energy storage system integration moves towards brand integration
To realize the normal and orderly development of energy storage, not only the initial investment, but also the safety and efficiency of the whole life cycle should be considered. Energy storage system integrators are practicing internal skills, such as strengthening a full understanding of the performance of batteries, PCS, EMS, BMS and other components, in order to maximize and optimize the overall design and release the potential of the entire system. From the current energy storage system integrators, there are three main categories.
One is the device assembly mode, in which all the devices are collected externally for assembly. One is a single device supplier such as PCS and battery, which is transformed into a system integrator with one skill. The third type is the specialized brand integration mode. Key devices such as BMS, PCS, and EMS are all self-developed, with software and hardware on the same platform, collaborative design, and integrated system integration. It is not difficult to see that the integration of specialized brands is subverting the integration of traditional energy storage systems.
The development path of multiple industries shows that professional energy storage system integration will move from patchwork and build-up mode to brand integration. This will not only make the product safer and more efficient, but also provide more security after sales, reduce friction, and facilitate operation and maintenance. Integrated integration and one-stop operation and maintenance are the future development direction of energy storage. Industry experts said that a complete energy storage system requires not only strong technical strength in the fields of electrochemistry, power electronics, and power grid support, but also the ability to organically combine hardware and software into a complex system for support.
Only then can we achieve the safety management and control from source control, process protection, terminal fire protection, etc., to ensure the long-term stable operation and application safety of the energy storage system. As a leader in professional energy storage system integration technology, Sungrow has been deeply involved in the field of power electronics for 25 years, and has deployed energy storage business for 16 years. In terms of technological breakthroughs, he has a lot of experience in power electronic conversion, energy storage charge and discharge management, and research on related technologies for power grids.
3. Three-electrical fusion professional integration
Deep integration of power electronic technology, electrochemical technology, and grid support technology, narrowing the distance between electrochemical and grid through power electronic technology, and managing the DC side and serving the AC side are the keys to the professional integration of Sungrow's energy storage systems. Three-electrical fusion breaks the old custom of system integration. One of the top 5 household PCS manufacturers, SUNGROW has broken through the application barriers of three electric technologies through the integrated design of "one set of products, one data system, one set of control system, and one linkage logic".
Realize efficient linkage between products, and then support the three requirements of "safety, high efficiency, and grid connection". The three-electrical fusion technology has excellent performance in power coordinated dispatch, linkage control and protection, and active support of the power grid. In terms of power coordinated scheduling, compared with similar products in the industry, MEPT energy efficiency optimization is achieved through three-electrical integration. Promote the collaborative control among PCS, EMS, and cluster-level managers, which can realize differentiated scheduling and energy distribution of each cluster battery according to the demand of the power grid.
In terms of linkage control protection, for the overcurrent fault of the energy storage system, the three-electrical fusion is based on the traditional electrical fuse protection, and has risen to the dimension of "double-electrical breaking" of electrical + power electronics. The fault circuit can be disconnected within 10 microseconds through the semiconductor method, which further improves the speed and accuracy of the protection. When the system is running, the BMS system monitors the battery status and warns of abnormalities in time, and links the temperature control system and power system to provide precise protection for the battery.
Different protection logics can also be set according to the type of fault. In case of serious faults, PCS, etc. can achieve millisecond-level linkage protection, and active emergency stop ensures system safety. In terms of actively supporting the power grid, through the three-electrical integration to coordinate the electrochemical energy control and grid dispatching requirements, the One Grid of the energy storage system and the power grid is deeply integrated, and 20ms fast response support is achieved.