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Power-flow initialization of fixed-speed pump as turbines from their characteristic curves using unified Newton-Raphson approach
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机译：Power-flow initialization of fixed-speed pump as turbines from their characteristic curves using unified Newton-Raphson approach
ABSTR A C T Fixed-speed pump-as-turbine (FSPAT) generators have been more utilized in grid-linked small hydro power plants for several years. Since an increased integration of FSPATs affects power-system dynamic behavior, an accurate dynamic assessment of power systems, including the FSPAT, is essential. In order to perform a dynamic simulation, an appropriate initialization is required to get correct initial conditions. However, initializing FSPAT using a conventional power-flow method for the dynamic simulation is not straightforward due to an un-avoidable reactive-power mismatch between the power-flow result and generator model. To overcome this problem, this paper proposes a precise dynamic initialization of the FSPAT using a unified Newton-Raphson (NR) power-flow approach where variables of pump-as-turbine characteristics and networks are fully solved together. Accurate steady-state solutions of the power network, including FSPATs, are demonstrated and compared with those taken from the conventional method. Moreover, convergent characteristics of the extended algorithm are investigated using IEEE 69-bus and 118-bus networks with a large group of FSPATs. The studied results show that the proposed algorithm not only yields a correct steady-state initialization without the problem of reactive-power mismatch but also retains a good quadratic convergence characteristic.
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