Approaching hybrid wind-diesel systems and controller area network
ABSTRACT High wind penetration hybrid wind-diesel systems have complex control requirements. The random nature of the wind, the cubic velocity to power relationship and the fast response of wind turbines make control goals like maintain system stability, and prescribed power quality levels, not easy to achieve. This paper deals with how to implement a distributed control system based on the controller area network (CAN) in hybrid wind diesel systems with high wind penetration. Firstly some introduction to hybrid wind-diesel systems is presented. Secondly two architectures for such hybrid systems are presented and studied mainly from the control point of view. This study concludes with a need of a distributed control, and the definition of some sensor and actuator nodes in the system. The CAN bus is used to close one of the several regulation loops presented. Some considerations about real time distributed control like clock synchronization among nodes when using CAN bus are presented. Finally some advantages of using CAN with such hybrid systems are outlined.
Conference Paper: Design of Supervisory System Based on CAN Bus for Wind Power Plant[Show abstract] [Hide abstract]
ABSTRACT: The design of the real-time state supervisory system based on the CAN (controller area network) bus for wind power plants is presented, including the network structure of the whole system, the design of hardware and software. The supervisory system has four layers, namely, the data acquisition layer, the data processing layer, the data transport layer and the user layer. The electricity data that are processed by the industrial computers are transmitted by the CAN bus to top-layer computer to be managed and displayed. This system has been put into operation in a wind power plant in Guangdong and achieved favorable effects.Industrial Electronics, 2006 IEEE International Symposium on; 08/2006
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ABSTRACT: High wind penetration wind-diesel hybrid systems (WDHS) have three modes of operation: diesel only (DO), wind diesel (WD) and wind only (WO). A distributed control system (DCS) based on the CAN (controller area network) bus is proposed for diesel generators (DGs) scheduling in DO mode, for active power control in WD mode, for frequency control in WO mode and for reactive power control in the three operation modes. Also it is presented the main message for each of the DCS proposed. Finally it is specified a complete DCS solution for the control of WDHS based on two CAN buses, one high speed CAN bus with the nodes involved in the real time tasks and other low speed CAN bus which links the nodes taking part in the DGs and controllable loads scheduling task.Industrial Electronics, 2004 IEEE International Symposium on; 06/2004
Conference Paper: Hierarchical control for hybrid wind systems[Show abstract] [Hide abstract]
ABSTRACT: Hybrid wind systems couple wind turbines with storage and/or other generation technologies to maximize wind energy production while meeting operational requirements in terms of frequency control, regulation, load following, and scheduling. To increase fuel savings and emission reductions, a hierarchical control structure is proposed in this paper that combines supervisory control and component local control. In supervisory control, unit commitment and power dispatch are optimized and communicated to component local controllers. Frequency/voltage droop (P/Q droop) functions are developed for battery banks and diesel units to regulate system frequency and voltage. PSCAD simulation results indicate that the proposed hierarchical control strategy enables high wind penetration without compromising system performance.North American Power Symposium (NAPS), 2009; 11/2009