On the global journey towards green, low-carbon, and "dual carbon" goals, the electrical industry, as the backbone of energy transformation, is entering the fast lane of development, demonstrating unprecedented technological vitality and innovation opportunities. On September 21-22, the 19th Annual Conference of the Chinese Electrotechnical Society (ACCES 2024) titled 'Enhancing New Quality Productivity, Innovating for a New Future in Electrical Engineering' was held in Xi'an.
At the meeting, led by academicians such as Chen Weijiang and Li Jiangang, more than 2000 experts, scholars, and industry leaders gathered to conduct in-depth exchanges and discussions on new power systems and new energy, power electronics technology, and power equipment, and jointly seek a new blueprint for innovative development of electrical engineering. Dr. Xuan Yang, the technical director of the company, was invited to attend the conference as a new emerging force in the field of solar energy. He delivered an expert report on the exploration and practice of a new "grid storage charging" power electronic system solution.

Power electronic transformer

Building a new distribution network framework

The construction of new power systems using power electronic transformers has pressed the "acceleration button", and distributed renewable energy is flourishing. This process poses challenges to the carrying capacity and scheduling flexibility of the distribution network. Based on the above background, in order to improve voltage frequency stability and increase the consumption rate of renewable energy, a flexible soft switching solution based on power electronic transformers (PET) is proposed for photovoltaic energy. This solution can improve voltage and frequency stability, actively regulate power flow, and enhance the consumption rate of renewable energy in the normal state of the distribution network; In the event of a fault in the distribution network, automatic loop closing and fast fault isolation can be achieved. Through the above innovative technologies, peak load rates can be reduced by 20%, network losses can be reduced by 36.9%, and the carrying capacity of distributed renewable energy and electric vehicle charging loads in the distribution network can be increased by more than 18%.
In addition, a PET based AC/DC hybrid microgrid solution has been proposed for optical energy. This solution utilizes PET technology to construct electric energy routers and switches, achieving information physical integration, cluster operation, intelligent regulation, and reducing losses by more than 5%. By using an electric energy router to connect to the 10kV distribution network, a first level 750V DC distribution network is constructed. Then, a 375V/48V DC distribution network is built using an electric energy switch, achieving an inherently safe green and low-carbon energy system that combines "life safety" and "energy safety", and helping to create a strong and flexible distribution network framework.

Matrix energy storage system

Overcoming energy storage safety and economic challenges

  As a leader in the third-generation energy storage system, we have always been driven by innovation for solar energy, gradually building a development path of electrochemical energy storage and power electronic transformers in parallel, achieving significant breakthroughs in multiple technologies and product innovations.
Dr. Xuan Yang stated that the matrix energy storage system for solar energy has achieved deep penetration of power electronics into both the battery side and the grid side. He has independently developed power electronic battery packs and grid type inverters to create an energy storage system that better understands batteries and the grid. On the battery side, the first battery module controller in the industry has increased the available power per cycle by 7% and extended the cycle life by 25%; Identify faulty battery cells in advance and achieve active safety; Up to 33% of faulty modules can be actively disconnected online, and the system can run continuously without stopping. On the grid side, the PCS for photovoltaic energy has 100% unbalanced load and off grid load functions, with a maximum efficiency of 99.06%. It supports fast charging and discharging switching within 30ms and 1.2 times long-term overload, and supports high voltage ride through of 1.3pu across the entire voltage range and all cell operating conditions.

File image 26/1000 real-time translation PET direct hanging overcharging matrix E4Matrix SC

PET direct hanging overcharging matrix E4Matrix SC

Unlock the new experience of 'four pole' charging

File image 26/1000 real-time translation PET direct hanging overcharging matrix E4Matrix SC

PET direct hanging overcharging matrix E4Matrix SC

Unlock the new experience of 'four pole' charging

     The PET direct mounted supercharging matrix E4Matrix SC, specially designed for electric vehicle supercharging application scenarios, uses power electronic transformers instead of power frequency transformers and converters to achieve full chain power electronicization, bringing users a "four pole" charging experience: extremely full - adopting a transformer storage charging integrated and electromechanical split design, supporting different charging powers of 120kW-750kW, suitable for supercharging stations, public charging stations, light storage charging and other scenarios, and adaptable to various vehicle models; Minimalism - Modular design of network access chain, charging chain, and energy storage chain, flexible expansion, saving 15% of land area occupation, reducing 20% of city capacity occupation, and reducing 38% of transformer and transformation equipment capacity; Speed - Supports 750kW high-speed charging, truly achieving a 1-minute range of 100 kilometers, with wide voltage range operation capability, suitable for incremental supercharging models, electric heavy-duty truck supercharging, etc; Extreme efficiency - using silicon instead of copper, with no no-load loss, the highest system efficiency can reach 97.5%, which is more than 5% higher than traditional AC solutions.
In the future, for solar energy, we will continue to adhere to the original intention of innovation leading change, deeply cultivate and refine every inch of technological soil, relentlessly pursue the ultimate and perfect products, continue to promote the wave of technological innovation, accelerate the transformation of power electronics in the "grid storage charging" field, and further contribute to the realization of the "dual carbon" goal with the wisdom and strength of solar energy.