Integrated energy system is an important means of “multiple energy complementary and coordinated development of source, network, load and storage” in industrial parks. Firstly, load characteristics of industrial parks represented by large industrial parks, high-tech parks and other professional parks are analysed. Based on the load characteristics, the construction direction of integrated energy system for each type of industrial park is proposed. Secondly, technical, political and economic constraints at different stages of the development of the integrated energy system in these parks are studied. And based on this study, the short-term, mid-term and long-term development directions of integrated energy technologies in industrial parks are proposed considering planning and construction, operation optimization, coordinated control, demand management and market transactions. Finally, a technical framework and specific connotation for the construction and operation of integrated energy system are proposed.

This paper analyzes the demand of integrated energy in typical industrial parks. Based on this, the typical morphological characteristics of the integrated energy system in future industrial parks are analyzed, including the combined cooling, heating and power for distributed energy stations, the PV-ESS microgrid in industrial parks, small hydropower plus decentralized wind power in industrial park, active distribution network with energy interconnection in industrial park and multi-energy complementation based integrated energy system. Then, the characteristics of the multi-energy complementation, the deep integration of physical information, and the coordination and interaction of the source, network, load and storage of integrated energy system in industrial parks are analyzed. Finally, combining with the existing conditions in energy and information infrastructure and energy market of China, this paper discusses the evolutionary route of the integrated energy system in the industrial parks from three stages of the short-term, mid-term and long-term development.

With the development of smart power distribution technology and demand response technology, scientific and reasonable interaction mechanism has become an effective approach to achieve the integrated energy consumption optimization and improve multi-party interaction. This paper studies the industrial integrated energy system (IES). Firstly, the hierarchical interaction structure of IES is established with the principle of promoting interaction and improving dispatching efficiency. Secondly, multiple interaction patterns including demand side bidding, contracted demand response, heat-electricity coupling and critical peak pricing are analyzed. Thirdly, considering the combined heat and power(CHP) generation characteristics and the complementation of heat and electricity demands, the integrated demand response dispatching model is built and the multi-agent oriented interaction mechanism of IES is established, which could effectively save integrated energy cost, and achieve the win-win situation for operator, consumers and CHP of the industrial park. The case study verifies the effectiveness and economy of the mechanism proposed.

The maritime power strategy promotes the country to make deep exploration and reasonable development in the South China Sea. It is essential to make full use of renewable energy surrounding the island and build a multi-energy complementary island microgrid. The island microgrid can realize safe and reliable power supply to guarantee island development and residents’ daily life. Based on technological achievements of multi-energy complementary island microgrid of China Southern Power Grid in the South China Sea, the difficulties in island microgrid caused by the natural climate and social factor are analyzed, multi-energy complementary solutions, capacity configuration and storage system are introduced, and zone control strategy based on source-grid-load-storage interaction is proposed in order to maintain stable operation of island microgrid. The development trend from island microgrid to island comprehensive energy network is also discussed finally.

Considering the coordinated optimization of generation, network, load and storage, this paper builds a three-layer planning model of the active distribution network frame by taking the minimum annual comprehensive cost as the goal. Through the mutual transfer and coordination of the three-layer model, the distributed power supply, the interruptible load, the distribution network frame and the battery energy storage are optimized coordinately in the distribution network. The hybrid algorithm combining the modified genetic algorithm with the tree structure coding and the original dual interior point method is used to solve the model. The calculation results of the system with 29 nodes verifies the correctness and effectiveness of the proposed method which also indicate it can effectively reduce the cost of distribution network planning and improve the load characteristics of distribution network by considering demand side management measures and the optimization of the output of battery energy storage.

A business mode of user-side battery energy storage system in industrial parks is established based on the analysis of the current energy storage related policies in China. The operating mode includes design of investors/operators, electricity metering and settlement methods. Moreover, an economic analysis model for user-side battery energy storage system is built considering different charging/discharging operation strategies. For lead carbon battery, lithium ion battery and all-vanadium redox flow battery, the cost/benefit analysis and key parameters sensitivity analysis of user-side battery energy storage system are carried out in detail. The simulation results show that under the existing energy storage technology conditions, investing user-side battery energy storage system is not economical. Finally, the incentive policies for user-side battery energy storage are analyzed.

The typical operation mode of distributed photovoltaic(PV) generation invested by the power grid corporation is analyzed. Based on the latest energy and electric policy, the business operation modes and the corresponding income sources are summarized. The cost/benefit predicting and calculating method for three typical operation modes are proposed, i.e. “local utilization and surplus injected into power grid” mode, “all injected into power grid” mode and “trade in the market” mode. Taking the conditions and parameters of Guizhou province as an example, a quantitative analysis is carried out. The initial investment, annual income, static payback time of distributed PV at various typical modes are calculated. The parametric sensitivity of distributed PV system construction cost per kW, local distributed PV annual utilization hours, distributed PV subsidy, distributed PV local utilization ratio and users’ electricity tariff are analyzed.

Fair and reasonable cost sharing and income allocation are the focuses of the participants in an integrated energy system(IES) of industrial park. Firstly, the characteristics of the independent operation and cooperative operation modes in the IES of the industrial park are analyzed, and the increased costs and increased revenue sources under the cooperative operation model are deeply analyzed. Secondly, the in-depth analysis of the cooperative game behavior of the participating parties is conducted. On the basis of this, a model of multi-participant cooperation game in industrial parks and its utility function are established, and a method for calculation of cooperation surplus is proposed; a method of cost allocation and income allocation for industrial parks based on the Shapley value is proposed. Finally, a simulation example is given to verify the validity and fairness of the method.

The user-side microgrid is a comprehensive energy system that can be implemented by multi-energy complementation and source-load coordination at the user-side. To meet the lightweight and practical demand of energy management of the photovoltaic storage type user-side microgrid, the user-side microgrid energy management strategy structure is promoted, also the photovoltaic local consumption promoting strategy, photovoltaic local consumption promoting & peak-valley reduction strategy, and the link-line power smoothing strategy are promoted. These energy optimization strategies are implemented in the embedded microgrid central controller and can be configured on the microgrid central controller according to the needs. The demonstration and application of the promoted energy optimization strategies are carried out in the demonstration project. This paper provides a variety of reference and engineering experience for the user-side microgrid energy management strategy.

As the terminal form of integrated energy system, microgrid can be used as a supplement to large power grid, especially off-grid microgrid is considered to be an effective means to solve the power supply in island and remote area. Aiming at the medium and above scale off-grid microgrid with multi-type power supply such as wind power, photovotaic power, diesel generator and power storage, taking the economic operation interval of diesel generator and energy storage as the constraint, an economic operation strategy of microgrid with diesel generator and power storage as the main power supply respectively is proposed to reduce the operation cost. Through the coordinated control of multi-energy complement among wind power, photovotaic power, diesel generator and power storage, the sufficient accommodation of new energy and the economic operation of diesel generation/ power storage are achieved. After the strategy is applied, the fuel consumption per kilowatt can be reduced by the economic operation of the main power supply, and the fuel consumption can also be reduced by using new energy generation. The strategy is applied to the off-grid microgrid in an island, and the actual operation results show that the proposed economic operation strategy can operate efficiently and accurately under harsh conditions.

As a typical intelligent energy system, integrated energy system can promote the integration of sources, networks and loads, and improve the utilization of renewable energy. Therefore, intelligent energy systems should be evaluated in terms of core features as low-carbon and high-efficiency at the same time. Based on the concept of multi-energy complement, a new evaluation index, the comprehensive energy efficiency level, is proposed to describe the energy utilization efficiency of multi-energy systems. Considering that the economy of energy consumption is the core driving force of the user to spontaneously adjust the strategy of energy use, this paper takes the maximizing comprehensive energy efficiency level and improving economy of energy consumption as the optimization objective, proposes the multi-objective optimization model of the integrated energy system, and obtains the optimal strategies of energy use under the restrains of both physical and cold-heat-electricity balance, and realizes the optimal dispatching of the system. A case analysis shows that the proposed optimal dispatching strategy can improve the clean-liness and efficiency of the system.

At present, the thermal network and electrical network in regional energy network are intensifying their coupling, and provide users with different forms of energy such as cold, heat and electricity. However, the relevant coordinated control technologies are still immature. Considering the advantages and disadvantages and their complementary characteristics of different energy sources, a hierarchical and distributed collaborative optimization control structure is proposed. The structure centers on the power grid and collaborate optimization and interconnection with thermal network, at the same time, it draws on the idea of information and data interconnection, integrates energy into network, and matches corresponding communication means to achieve multi-energy coordination, complementarity and deep integration. Finally, through PSCAD/EMTDC simulation platform, a regional energy network model considering the electric-thermal coupling characteristics is bulit to verify the effectiveness of the proposed control strategy.

To make use of resources in a reasonable and effective way, the energies of users should be optimized and managed. In this paper, an interactive optimized energy management method is proposed for integrated energy system in the commercial area. Model is established in accordance with typical configuration of internal combustion engine, the configuration includes gas engine, waste heat recovery device, cooling load peak modulation device and hot water preparation device. According to the different seasonal demand for energy, three modes are put forward, which are centralized cooling operation, centralized heating operation and transition season operation. and the optimization objectives and constraints of three kinds of operation mode are established. Through a typical case, the optimal output curves under different operation mode of each unit are obtained to achieve energy optimization scheduling.

With the worsening trend of environmental pollution and increasing energy consumption, it has become an urgent issue to construct a clean and efficient energy system. In order to improve renewable energy consumption and reduce operation cost, a distributed optimal method for integrated energy system (IES) with multi-agents is proposed in this paper, which includes combined heat and power (CHP) and PV prosumers. Firstly, a demand response model with thermal energy and electricity is constructed, which includes energy sharing among prosumers, energy sharing between CHP operator and prosumers and heat-power interaction, and the model of prosumer is built with considerable economy and comfort degree. Secondly, to minimize system operation cost, a basic optimal model for CHP operator and PV prosumers is built. Moreover, on the basis of alternating direction method of multipliersa, a distributed optimal dispatching model for IES with multiple agent is proposed, which achieves energy sharing between CHP and PV prosumers. Finally, the effectiveness of proposed model and method is verified through a case study.

As a typical micro-integrated energy system, the park-level integrated energy system has the advantage of increasing the consumption of renewable energy on site and improving the efficiency of integrated energy utilization through multiple consumptive technologies and multiple storage technologies. In this paper, the daily lowest operating cost and renewable energy maximum consumption of the integrated energy microgrid system is taken as the objective function, and various load balance constraints and system components running constraint are considered, a day ahead optimal operation model is established for the integrated energy microgrid system with external supply, conversion, storage and consumption of various energies including cold, heat, electricity and gas. Based on Yalmip toolbox of MATLAB, optimization algorithms are programmed to apply Gurobi’s business planning software to solve them. By setting up adjustable natural gas pipeline operation constraints and contact line constraints to simulate the various scenes, start-stop plan and output distribution of the units in the park are solved, and the impacts of the external energy supply constraints on micro grid operation are discussed. The effectiveness of the model solving method is confirmed by the optimized results.