With the development of computer, internet and other technologies, the application areas of cloud computing technology continue to expand, which provides an opportunity for the transformation and upgrading of IT companies. Based on the concept of cloud computing technology and according to the requirements of China’s future power grid dispatching technical supporting system, the centralized-distributed and centralized system architecture of dispatching technical supporting system are respectively proposed in this paper. With the comparison on these two kinds of architectures, the centralized-distributed architecture is pointed out to be the recent development goal of the dispatching information system of China. For the centralized-distributed system architecture, the 1+N two levels deployment architecture is put forward. Finally, the technical problems of the application of centralized-distributed architecture to power grid dispatching automation system are analyzed in this paper.

Many technical problems of power dispatching automation system are discussed, and the feasibility of applying cloud technology to this system is analyzed in this paper. A new generation of power dispatching automation system architecture is proposed based on cloud computing architecture. The technology idea on power grid operating data pool, big data analysis applications and distributed multi-live data center are presented according to analysis of system hardware architecture and platform architecture. A case development and implmentation scheme of power dispatching automation system architecture and N-1 static security analysis of power system are proposed based on the practice of China Southern Power Grid.

In order to solve the contradiction between the requirement of stability and efficiency and the requirement of opening access of the third party system in the integration of power secondary systems, and resolve the problems of positing, operation and maintenance of the unified data center, an architecture of intelligent dispatching supporting platform is presented, which consists of ICT (information communication technology) supporting, unified data center and standard service bus. This platform constructs a panorama data model for power grid based on integration of core bussiness model, and provides an standard open interface for the third party system. Compared with the traditional scheme, this architecture can not only conveniently achieve the collaboration among multiple business systems, but also ensure the stability, high efficiency and safety of the core busineses,and provide a good support for the information integration and unified analysis of power system.

The panorama of power system and substation diagram automatic generating technology based on IEC 61970 common information model (CIM) is discussed. Based on the dynamic diagram automatic mapping model, the smallest ellipse geographic partitioning area algorithm, and the substation layout of release-compression algorithm, the panorama of the complete CSG power system models above 110 kV is realized in CSG Power Dispatching Control Center including whole model integration and automatic diagram generation of the power system above 110 kV, automatic layout generation of substation diagram, automatic power flow diagram generation with geographic background, synchronous update of the diagrams with network model. All the diagrams are imported into EMS and other applications and achieve the integration of panorama of power system, which improve the efficiency of power grid operation and maintenance, and provide more accurate, reliable and rich power system graphics and visualization supports for power dispatching centers.

Operation Smart System (OS2) is put forward by China Southern Power Grid as a new generation of power grid dispatching operation system. Its top-level application is power grid operation cockpit (POC), which consists of three core functions such as key performance indicator(KPI) monitoring and warning, panoramic view and centralized console. Centralized console integrates various types of operation, control method and layouts control function to achieve the closed-loop control of the key link, which can solve the problem of dispatchers needing to switch between multiple business system with task-oriented grid regulation. Technology architecture and function orientation of the centralized console are introduced. Some key technologies are studied such as function integration, graph remote call, operation safety, business process definition. This centralized console has completed the pilot run of the China Southern Power Grid OS2’s operation cockpit console.

With the rapid development of power grid business and the improvment of management requirement, the current power grid operation smart system zone Ⅲ Web with scattered maintenance/management cannot meet the development requirements of power grid and the requirements of secondary system integration construction of China Southern Power Grid. An integrated power gird operation smart system zone Ⅲ Web scheme based on Citrix is put forward. The feasibility and system architecture of the integrated power grid operation smart system zone Ⅲ Web based on Citrix are given, the key technologies of integrating the current zone Ⅲ Web relating to function reconstruction, server virtualization, function publishing, and system regulation and optimization are elaborated. Practical operation and tests show that the proposed scheme can satisfy the practical requirements, and improve the performance of the zone Ⅲ Web and the effectiveness of operation, maintenance and management.

To meet the requirements of reliability and efficiency for digital substation, this paper presents a practical digital substation design scheme, including substation communication network design, substation configuration design and device design. The scheme uses not only redundant communication technology based on PRP (parallel redundancy protocol) and HSR (high-availability seamless ring), but also flexibility hardware and software configuration of devices and whole station type configuration from system to device.The presented design is not only reliable and efficient, bust also convenient for maintenance and expansion of digital substation.

Merging unit is the key device in the process layer network of smart substation, and the stability of the operation of merging unit is very important for the reliable operation of smart substation. In order to eliminate the impact of network storm on merging unit in the data cascade, this paper proposes a real-time filtering method for cascade network storm. Based on the analysis of the characteristics of the cascade storm packet, the filtering method of hardware filter and software filter is proposed to suppress merging unit cascade network storm. In the terms of hardware filter, the storm packet flowing in is effectively controlled in real time by the multiple filter and flow control unit. In the terms of software filter, storm packet is effectively filtered by the multi-filter algorithm based on IEC 61850-9-2 packet characteristics. The method is tested through the network storm test platform, the reliability of the method is validated, and the stability and reliability of merging unit in smart substation are improved.

The necessity of smart distribution grid secondary system integration is analyzed based on the physical form of smart distribution grid and the production and operation characteristics in the entire process. The common information model and interface specification of distribution network in IEC 61970 / 61968 international standard are emphatically discussed, and the unified model of the equipment of smart distribution grid is established by expansion. The technology architecture for secondary system integration of smart distribution grid is analyzed from three aspects including the integrated structure of secondary system integration based on information interactive bus, the service-oriented information interactive architecture and metadata technology. The technology architecture is proved feasible by a practical application case, which can provide a reference for promotion of smart distribution grid application systems.

With the diversified development of investment subject in active distribution networks, the planning scheme of power system should scientifically take all active components into account such as the objective access mode of distributed generation(DG). Taking maximizing the global benefit of distribution network as an objective, this paper proposed a multi-stage battery energy storage system(BESS) allocation approach considering the growth mode of DG. This methodology can effectively combine the arbitrage behaviors and life-cycle management and therefore the optimal BESS allocation strategy is obtained compatible with the stepwise growth of DG. Thus the long-interval planning facing with final scene is extended to the multi-stage adaptative planning. The experiment result shows that the proposed method can deal with different types of DG development and enhances the penetration of renewable energy, moreover, the utilization of BESS is effectively improved.

With more and more electric vehicles (EVs) integrated into power grids, the charging of EVs may impose great challenges on dispatching and operating of both transmission and distribution grids. A literature review on the impact of EVs charging on both transmission and distribution grids as well as optimal dispatch study is presented in this paper, which includes distributed smart charging, EVs and microgrids coordination, EVs and large-scale wind energy coordination, and so on. It is concluded that if the issue of EVs charging and even discharging behaviors can be effectively dealed with through smart distribution dispatching algorithm, the challenge of EVs charging may create a new opportunity for power grids to solve the problelm of peak load shifting and improve the utilization of new energies shch as wind energy and solar energy.