Research status of Power quality Monitoring system.
Research on the overall Architecture of Power quality Monitoring system.
Research on the architecture scheme based on a specific terminal in this kind of research, the implementation of the specific monitoring terminal is often the focus of the discussion, and the architecture of the monitoring system is often based on the premise of adapting to this kind of terminal. Power quality monitoring terminals can not be realized by existing terminals because of their special requirements in sampling rate, data statistics, transmission format and so on. In the recent research, one is to build a monitoring system for embedded devices, and the other is based on virtual instrument technology, using industrial control computer and host organization to build the system.
At present, a regional power quality monitoring system has been widely built in China to fully grasp the power quality of all parts of the region. In this kind of system, there are a large number of monitoring points and a long construction period, and the monitoring terminals used are often not limited to a specific type. Therefore, it is necessary to study the general architecture of monitoring system.
Common architecture scheme.
1) CORBA-based architecture. The related research uses the common object request broker architecture ((Common Object Request Broker Architecture,CORBA) technology to realize the remote access and control between the central control station and each monitor in the heterogeneous environment. CORBA technology is generally used to provide flexible communication mechanism between different applications. When it is used to monitor data transmission, the difficulty of terminal implementation, system maintainability and whether it can be transmitted across firewalls need to be further studied.
2) MAS-based architecture. A multi-agent system (Multi-Agent System,MAS) is a collection of multiple Agent, where each Agent is a physical or abstract entity. The architecture based on MAS is more in line with the characteristics of the distributed structure of power system, but there are still many practical engineering problems to be solved, such as how to implement complex Agent programs in different types of monitoring terminals, what standard communication coordination each Agent is based on, and so on.
3) the architecture scheme based on scheduling system mode. This kind of architecture scheme is generally composed of field acquisition terminal, communication network, hierarchical remote monitoring center and client. Considering the actual situation of China's power grid, this architecture scheme is widely used in the construction of regional monitoring system. At present, the domestic provinces generally adopt the three-tier monitoring system architecture.
Considering the actual situation such as management mode, construction cost and communication network structure, some regional monitoring systems also adopt a two-tier structure scheme, which is mainly different from the three-tier structure in that there are no monitoring sub-stations. The Italian power quality monitoring system adopts two-tier architecture; the open monitoring system of Jiangxi section of Zhejiang-Jiangxi electrified railway temporarily adopts two-tier distributed structure, but the data exchange interface for the transition to three-tier structure is reserved; Shanghai power quality monitoring system adopts two-tier architecture, and a number of communication front computers are used in the main station to share the communication pressure.
From the development trend, the three-tier structure can support access to more monitoring points, has high scalability, and can meet the needs of monitoring data quantification.
4) the architecture scheme of open monitoring system. Related research applies the idea of open architecture to the monitoring system, and constructs an open unified platform through the abstraction of the functional interface of the system and the standardization of communication to meet the needs of integration and interaction of different types of monitoring terminals and systems.
The open architecture is compatible with the advantages of openness, which can make the monitoring system develop smoothly and have a long life cycle. However, at present, most of the research is only theoretical discussion, and there is not much research on the specific implementation.