In order to study the operation performance of photovoltaic grid-connected power generation system and optimize the design of distributed power generation, the monitoring technology of distributed power generation has been carried out in depth with the development of photovoltaic industry.
The distributed power monitoring system monitors, measures and controls the operating status, equipment parameters, and environmental data of the distributed power. Mainly reflected in equipment and personal safety, power generation reliability and quality, grid-connected power management, equipment life management, centralized or remote monitoring, etc., to achieve safe, reliable, economical and convenient operation of photovoltaic power generation systems.
Monitoring system composition
Generally speaking, the distributed power monitoring system is generally divided into three layers: the station control layer, the network layer, and the interval layer.
The station control layer is composed of a monitoring host and a remote communication device, etc., and provides functions such as overall station equipment operation monitoring, video monitoring, operation management and communication with the dispatch center.
The network layer is composed of on-site network switching equipment, network lines, network switching equipment at the station control layer, etc., providing interconnection and communication of the operation and monitoring equipment of the whole station.
The bay layer is the field equipment bay layer, which is composed of power generation equipment (including confluence, power distribution, inverter), power distribution and metering equipment, monitoring and control devices, protection and automatic devices, etc. It provides the functions of power generation operation of the whole station and on-site independent monitoring. In the case of station control layer or network failure, the on-site monitoring function of the bay equipment can still be independently completed.
Monitoring system design principles
The design of the distributed power monitoring system should follow the following principles:
(1) Integrity. The system can complete the unified and complete collection of monitoring data from different manufacturers, different types, and different models of equipment, and can provide application services for real-time data, periodic sampling data, and event data.
(2) Normative. The system specification follows the relevant national standards, international standards and relevant standards of the electric power industry. Formulate or improve relevant standards and specifications to ensure the standardization of monitoring equipment and monitoring data communication. The interface design follows the specifications regarding interface design.
(3) Extensibility. Hardware scalability: the system can be widely adapted to the communication interface of new access monitoring equipment; software scalability: software function modules should be reusable, configurable and detachable.
(4) Openness. The system can exchange data and information with various expert systems. The system can exchange data and information with systems such as power grid dispatching.
(5) Integration. It can integrate monitoring data such as environment, security, power energy, power quality, etc., classify processing, classify storage, and display monitoring data on a unified interface.
(6) Operability. Friendly interface, easy operation, focus on user experience.
(7) Adaptability. Adapt to the complexity of the internal electromagnetic and natural environment of the distributed power supply, and adapt to the accessibility of various systems of the distributed power supply.