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This paper investigates two control approaches to stabilize MVDC microgrids under large perturbations. The control approaches compared here are a 2 Degree of Freedom (2DoF) linear control and a synergetic control for voltage stability of DC microgrids, where loads and generators are interfaced through power electronic converters. The stabilizing control of the bus voltage resides in the converters...
The emergence of conventional electrical grid into smart grid has enabled the use of networked controllers for power system control applications. This article discusses the rotor angle stability enhancement of a power system using networked control, where the channel has random delays. An optimal stochastic control is designed to damp the oscillations in power system and compensate the delay effects...
This paper presents model predictive control method for load shedding based on trajectory sensitivities. According to the basic principle of model predictive control, aiming at minimizing the quadric performance index which comprehensively considers both the control cost and the deviation between bus voltage predictive trajectories and their reference values, the receding optimization model is described...
In the condition of suddenly increasing load such as summer peak load, contingencies and so on, it is important to ensure voltage stability margin (VSM) for preventing voltage instability as well as voltage collapse. To support active power on the system, some facilities for weak buses, such as ULTC, SC, FACTS (flexible AC transmission system), are controlled and the dispatch of committing generator...
The precision of the voltage phase angle measured by the PMU (Phasor Measurement Unit) can well meet the need of power system analysis and control. A new controller is proposed for power system stability, which can linearize its nonlinear state equations by online tracking of the state variable with the help of PMU, and complete an objective control strategy that forces the system state into a desired...
Voltage instability impacts power system transfer limits and its reliability. This paper presents an approach to determine a voltage control scheme based on the model predictive control (MPC) theory. MPC is used to develop an optimal control strategy, consisting of a sequence of amounts of the shunt capacitors to switch. The resulting control strategy prevents voltage instability and maintains a desired...
In this paper, we present the design of an observer of reduced-order used, in cascade, with optimal control to improve the small-signal stability of a multi-machine power system. The limitation of the measurement of all state variables of the system requires the design of reduced-order observer to reconstruct the unavailable part of the state variable vector. The non linear system is first linearized,...
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