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High penetrations of distributed renewables can dramatically increase uncertainty in the transmission system, making small-signal stability verification far more challenging. In this paper, we examine the impact of generating 30% of the power in the IEEE 118 bus test network with 118 distributed renewable sources, and show the inadequacy of sampling approaches to stability analysis. We show that multipoint...
The uptake of high penetrations of renewable energy in microgrids is curtailed by concerns that their intermittency may cause the system to become unstable. The classic approach of small-signal stability analysis may lead to overly optimistic conclusions, because it implicitly assumes that the intermittency is small-signal in nature. Instead, LMI techniques from robust controls can be used to provide...
We describe an adapted robust control technique for analyzing microgrid stability under the uncertainty of renewable sources and loads. Two realistic case studies are presented to demonstrate the method's effectiveness as a tool for system design and analysis. Results show that the method is able to provide a non-trivial lower bound for the minimum damping ratio of the system, and can find the unstable...
Many modern transmission systems suffer from electromechanical oscillations due to the large size of interconnected electrical networks. High Voltage Direct Current (HVDC) lines offer the potential to help with power oscillation damping (POD) for stability improvement purposes. In this study, a methodology is developed to assess potential POD controller designs. This methodology accounts not only...
This paper presents the worldwide developments of superconducting magnetic energy storage (SMES) devices. The application solutions of SMES technology for future smart grids are further discussed. The application topologies and advantages of SMES for micro grids, transmission and distribution systems are briefly described. The application scheme of hybrid energy storage systems (ESSs) and distributed...
A systematic methodology for placement and integration of wide-area measurements in high-voltage direct current (HVDC) damping modulation is developed for large-scale AC/DC power system. A concept observed centre of inertia (OCOI) of power grid is described. For an interconnected AC/DC power network, the frequency difference between the OCOI of the sub-grids can be used as the input signal for HVDC...
An approach for coordinated control of adaptive network-based fuzzy power system stabilizers and HVDC modulation controller is presented in this paper. Their parameters are tuning online by a back-propagation method to minimize a cost function. The object of the cost function is to eliminate the differences in speed between every two generators so that the controllers can track power angle changing...
This paper presents a decentralized mu-synthesis approach for the coordinated control of power system stabilizers and additive HVDC damping controllers. Conventional mu-synthesis is used for initialization of a decentralized controller, then the system model is reduced to a bilinear matrix inequality (BMI) and solved using the Homotopy method. Simulation results show that the control law designed...
An artificial neural network (ANN), trained as an inverse of the controlled plant, to function as a multi-input power system stabilizer (PSS) is presented. Generator speed deviation and electrical power deviation are used as the inputs of the PSS. The proposed multi-input ANN PSS using a multilayer neural network with an error back-propagation training method was trained over the full working range...
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