Testing of a hydro power plant’s stability and performance using PMU and control system data in closed loop
Journal article, Peer reviewed
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In response to recent concerns regarding deteriorating frequency quality in the Nordic power system, the Nordic transmission system operators (TSOs) have developed draft requirements for the provision of frequency containment reserves (FCR). These requirements outline extensive tests, which the power plant owners must perform to qualify to deliver FCR. In this paper we demonstrate that one can check these requirements by standard system identification techniques while the plant is in normal operation and by using measurements readily available from the plants control system or from a phasor measurement unit (PMU). The validity of the proposed method is demonstrated using Monte Carlo Simulation (MCS), where we investigate the effects of the main assumption and potential nonlinearities affecting the approach. Data from real power system operation is used to demonstrate the performance of the method.