http://portal.research.lu.se/portal/files/4879107/8727216.pdf

Drum-boiler dynamics

This paper describes a nonlinear dynamic model for natural circulation drum-boilers. The nonlinear model which is intended for model based control focuses on the complicated dynamics ofthe drum, downcomer, and riser components. A strong effort has been made to strike a balance between fidelity and simplicity. The model is derived from first principles, and is characterized by a few physical parameters. Results from validation of the model against unique plant data are presented. The model captures the shrink and swell effect very well. It also describes the behavior of the system over a wide operating range.

Drum-Boiler Dynamics

A dramatic transformation in system monitoring and control is taking place in the electric utility industry. New control centers are being equipped with multiprocessor real-time computers scanning and controlling the generation and transmission system via high-speed data-acquisition subsystems and interacting with the human operator via dynamic, color, graphic displays. Within the computer as many as a hundred or more programs are available to run in a multiprogramming environment in response to changing power-system conditions and to operator's demands. The main objective of this new development in on-line control is the enhancement of the security of the power system in order to maintain a high reliability of electric power service. The concept of security control is discussed and the noteworthy features of its present state of development in recently designed and installed control centers are described.

Real-time computer control of power systems

Survey paper: Large scale control problems in electric power systems

This paper presents a novel Dynam-i-c Droop (iDroop) control mechanism to perform primary frequency control with gird-connected inverters that improves the network dynamic performance. The work is motivated by the dynamic degradation experienced by the power grid due to the increase in asynchronous inverted-based generation. We show that the widely suggested virtual inertia solution suffers from unbounded noise amplification (infinite ℋ 2 norm) when measurement noise is considered. This suggests that virtual inertia could potentially further degrade the grid performance once broadly deployed. This motivates the proposed solution in this paper that overcomes the limitations of virtual inertia controllers while sharing the same advantages of traditional droop control. In particular, our iDroop controllers are decentralized, rebalance supply and demand, and provide power sharing. Furthermore, our solution can improve the dynamic performance without affecting the steady state solution. Our algorithm can be incrementally deployed and can be guaranteed to be stable using a decentralized sufficient stability condition on the parameter values. We illustrate several features of our solution using numerical simulations.

G. Quazza

Papers

Automatic control in electric power systems