Abstract
In this paper, a method for sizing the reactive power compensation in a non-interconnected island power system is presented and applied to determine the necessary inductive reactive power compensation for the autonomous power system of Rhodes Island, Greece. The Rhodes power system is often confronted with an excess of reactive power, as a result—inter alia—of underground high-voltage (HV) cable lines and distributed generation penetration. Reactive power compensation is typically a local issue in power systems, usually aiming at maintaining an acceptable voltage profile on specific transmission segments, e.g., long underground or submarine cables. In autonomous systems, however, where network lengths are relatively short, reactive power compensation is meant to address the overall reactive power equilibrium of the system. The proposed method follows a three-step approach. First, power flow analysis is conducted to determine the size of the maximum compensation that may be necessary, i.e., the compensation size that practically allows unit commitment to be conducted without being constrained by reactive power considerations. Then, a unit commitment and economic dispatch model is executed over the course of a year to determine the optimal compensation size, using the output of the power flow analysis to formulate reactive power balance constraints. Finally, the results of the economic optimization are assessed in terms of dynamic security to verify the feasibility of the optimal solution.
Highlights
The autonomous power system of Rhodes Island, Greece, has recently undergone a major transformation, including the implementation of a new thermal power plant (TPP), the reinforcement and upgrade of the HV network transmission system from 66 kV to 150 kV, and the installation of a new GIS HV/MV substation fed by underground HV cable lines to supply the city of Rhodes
Reactive Power Consumption Requirements in Rhodes Power System In order to investigate whether reactive power compensation is justified, the amounts of reactive power that need to be consumed by the generators in the system of Rhodes are first calculated by means of power flow analysis
This paper addresses the problem of appropriate dimensioning of the reactive compensation in the autonomous power system of Rhodes Island in Greece, which faces excessive reactive power system generation during low load periods, after major upgrades in its HV network
Summary
The autonomous power system of Rhodes Island, Greece, has recently undergone a major transformation, including the implementation of a new thermal power plant (TPP), the reinforcement and upgrade of the HV network transmission system from 66 kV to 150 kV, and the installation of a new GIS HV/MV substation fed by underground HV cable lines to supply the city of Rhodes. The implementation of the right capacity of reactive power compensation facilities, as needed to minimize negative effects of increased reactive power absorption requirements from online generators for the autonomous power system of Rhodes, is the topic addressed in this paper Both an investment-oriented and an operational approach are evaluated to derive the optimal size of shunt reactors needed for alleviating the reactive power equilibrium-based distortions introduced in the power system of Rhodes after reinforcement of its HV network. The objective and contribution of this work is to optimally size reactive compensation in real-world island systems by concurrently evaluating several indices, including RES curtailment levels, system economics, constraints of thermal units, and operating security criteria. Appendix A sets out further assumptions regarding the management principles of Rhodes Island, while Abbreviations presents the notation used for the UC-ED model
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