Lennart Petersen

Alternative parameter determination methods for a PMSG

One of the fundamental requirements for testing and analysing a Permanent Magnet Synchronous Generator (PMSG) is to obtain its electrical and mechanical parameters. This paper describes the test set up and the procedure for obtaining them. Stator resistance and flux linkage measurements follow IEEE standards. In the other hand a new approach for an alternative stator inductance and inertia measurement is analysed. More precisely, the former is obtained through laboratory work based on the locked rotor test, and the latter through a CAD software based on a 3D model. In order to assess and validate the obtained values, an electromechanical model is derived for validation and contribution of the whole project. Finally, small relative errors between measured and simulated values indicate the functionality of the used methods and of the machine.

Practical Considerations regarding Implementation of Wind Power Applications into Real-Time Hardware-In-The-Loop Framework

This paper addresses the system implementation of voltage control architecture in wind power plants into aReal-Time Hardware-In-The-Loop framework. The increasing amount of wind power penetration into the power systems has engaged the wind power plants to take over the responsibility for adequate control of the node voltages, which has previously been accomplished by conventional generation. Voltage support at the point of common coupling is realized by an overallwind power plant controller which requires high-performance and robust control solution. In most cases the system including all controls is reproduced in continuous-time domain using Laplace transform, while in practical implementation digital control systems are employed. The scope of this paper is to elaborate on the practical implementation of the voltage control architecture into aReal-Time Hardware-In-The-Loop framework, where the focus is laid on the model development in a real-time simulator. It enables to verify the functionality of developed controls, which is one of the research priorities due to the increased complexity of large wind power plants requiring high level of communication between plant control and a large number of assets such as wind turbines and FACTS devices.

On the Impact of using Public Network Communication Infrastructure for Voltage Control Coordination in Smart Grid Scenario

This paper focuses on the impact of using the existing public network communication infrastructure for online voltage control support and coordination of renewable generation (ReGen) plants in medium voltage distribution systems. The communication network infrastructure and related communication protocols have introduced several test scenarios and cases that are evaluated with respect to the related latencies and validity of the signals being exchanged between a control center and the ReGen plants. An exemplary benchmark grid area in Denmark, including flexible ReGen plants, is used as a base case for evaluating the network performance in terms of latency. The main outcome of this study is to provide a generic overview of the aspects and their effects related to the use of existing public network communication infrastructure for online coordination of voltage control in a distributed system, considering the huge ReGen penetration, in order to ensure a resilient voltage controlled distributed systems.