Demand-side multi-energy complementarity and supply-demand interaction promote the construction of energy internet

China Energy Storage Network News: In mid-March, the third meeting of the first academic committee of the Beijing Key Laboratory of Demand-side Multi-energy Complementary Optimization and Supply-demand Interaction Technology of China Electric Power Research Institute was held. Experts attending the meeting highly praised the strategic goal of State Grid Corporation of China to "three types and two networks, world-class", and believed that the essential form of energy Internet is sharing and win-win, and demand-side multi-energy complementarity and supply-demand interaction are important links.

Schematic diagram of the energy internet demonstration project at the Qinghe campus of China Electric Power Research Institute.

The Demand-side Multi-energy Complementary Optimization and Supply-demand Interaction Technology Laboratory of China Electric Power Research Institute is a key laboratory in the field of energy internet in Beijing, and was recognized by Beijing Municipal Science and Technology Commission in January 2017. The laboratory conducts research on demand-side multi-energy optimization, demand response, energy information model, and energy interconnection detection, actively implements the national energy strategy, and implements the strategic goal of "three types and two networks, world-class" of State Grid Corporation of China.

Innovative demand-side integrated energy technology

The construction of the demand-side energy Internet needs to rely on ubiquitous sensing technology to dynamically monitor multiple parameters such as user energy consumption behavior, equipment status, energy consumption information, etc., realize the interconnection of diversified systems and equipment based on a unified information model, and use core algorithms such as multi-energy complementary coupling and flexible resource aggregation and regulation to achieve comprehensive energy efficiency and promote regional power grid supply and demand balance.

Demand-side multi-energy complementary optimization technology is an important support for promoting diversified energy production and consumption and developing integrated energy services. To this end, the Demand-side Multi-energy Complementary Optimization and Supply-demand Interaction Technology Laboratory has built a demand-side integrated energy supply system based on the comprehensive utilization of distributed renewable energy, gas trigeneration, heat pumps, power/cold/heat storage and other resources. The system can achieve multi-energy coordinated supply and energy cascade utilization, achieving the goal of efficient, economical and clean utilization of comprehensive energy in the region.

Supply and demand interaction technology achieves the goal of changing or shifting power load demand by encouraging users to change their inherent habitual electricity consumption behaviors, thereby promoting peak load reduction and valley filling in the power grid and the consumption of new energy. Since 2014, the laboratory has developed a core algorithm for demand response resource regulation with the goal of lowest comprehensive energy utilization cost, highest efficiency, and lowest energy consumption, so as to enable power users, home appliance manufacturers, equipment manufacturers, load aggregators and other entities to jointly participate in the supply and demand regulation of the power grid, share the dividends of power reform, and enhance the user interaction experience.

In the future, the laboratory will also focus on the national energy development strategy and the company's "three types and two networks" world-class energy Internet construction, and strengthen the research on cutting-edge technologies such as energy efficiency cloud diagnosis service system based on the Internet of Things, intelligent electricity consumption simulation technology with extensive resource interconnection on the demand side, demand response cloud service technology based on ubiquitous Internet of Things, and distributed energy trading on the user side.

Promoting the practice of energy internet on the demand side

In the Qinghe campus of China Electric Power Research Institute, there are all kinds of new elements of energy Internet, such as integrated photovoltaic storage and charging carports, road photovoltaics, pressure fitness trails, power generation treadmills, distributed energy storage, etc. Here, electric vehicles can be directly charged by photovoltaic power generation; energy storage devices are charged at night when electricity prices are low, and discharged during peak hours during the day, cooperating with the optimization and regulation of the power grid.

The campus energy system also uses advanced equipment such as ice storage air conditioning system, heat station high-temperature flue gas waste heat recovery system, natural light import lighting system, IPv6 electric meter, power collector, energy router, etc., which constitute the multi-energy complementarity and efficient operation system of energy Internet. The regional energy Internet demonstration platform in the campus integrates the various elements of "source-grid-load-storage", realizes energy interconnection and service interaction, improves energy utilization efficiency and reduces energy costs. Since the implementation of the Qinghe campus energy Internet demonstration project, the campus has achieved annual energy saving benefits of approximately 206,300 yuan through heat station high-temperature flue gas waste heat recovery and precision air conditioning energy-saving control in the computer room.

The Demand-side Multi-energy Complementary Optimization and Supply-demand Interaction Technology Laboratory has also built a comprehensive energy optimization and supply-demand interaction test environment at the Changping UHV DC Test Base. The test environment is designed with semi-physical simulation interfaces for wind turbine simulators, photovoltaic inverters, energy storage lithium batteries, dual storage air conditioners, and trigeneration systems. It supports the import and verification analysis of actual operation data, and has strategy simulation functions such as multi-energy grid connection, multi-type load coordinated optimization operation, user-side multi-energy complementarity and demand response, which can meet the needs of comprehensive energy optimization, demand response technology research, and related standard verification.

At present, the laboratory has achieved a series of new results around the innovation and practice of energy Internet technology: developed integrated energy system planning, configuration and evaluation software; proposed integrated energy multi-energy flow simulation calculation and analysis methods, developed energy station intelligent controllers; developed multi-load active response terminals that can intelligently perceive voltage and frequency fluctuations; developed demand-side resource peak-shifting scheduling software driven by big data. The transformation and application of laboratory results has strongly supported the practice of energy Internet projects in Tianjin, Zhejiang, Hebei and other places.

Energy Internet construction should be based on standards

Ubiquitous power Internet of Things, multi-energy complementarity, energy materials, and energy-saving technologies are developing rapidly. There are many manufacturers and products in related fields, but there is a lack of unified product standards and specifications. This situation has led to great restrictions on product production and industrial development capabilities on the one hand, and on the other hand, it has led to a variety of technical applications and an ununiform technical platform.

The Demand-side Multi-energy Complementary Optimization and Supply-demand Interaction Technology Laboratory follows the principle of standards first, focuses on the application needs of ubiquitous power Internet of Things technology, and joins hands with well-known enterprises in the home appliance, communication, equipment manufacturing and other industries to create a platform for the formulation and revision of energy Internet standards and technical exchanges and sharing, and builds a ubiquitous power Internet of Things standard system covering the perception layer, network layer, platform layer, application layer, and security protection, forming more than 20 demand-side interconnection interface standard requirements. At present, the laboratory has completed the formulation of important standards such as the "Electricity Demand Response Information Exchange Specification", which has promoted the interconnection and interoperability of cross-border energy systems.

In the next step, the laboratory will continue to deepen the research and application of demand-side multi-energy complementarity optimization and supply-demand interaction technology, innovate green, clean, low-carbon and efficient new models of demand-side multi-energy complementarity, build an open and shared bridge to the society, enhance users' sense of gain, and open up new ideas for safer grid operation, leaner management, more accurate investment and better services.