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                                                            Power electronic control in electrical systems 105

                      (upwards of 50 km). The theory covers the operation at all load levels and considers
                      the reactive power requirements, the voltage profile, and the stability. Compensation
                      methods are identified for improving the performance with respect to all three of
                      these aspects, including both shunt and series compensating elements, and both
                      passive (fixed-value) and active compensators.
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