MODELING OF THE HYDRO-QUEBEC - NEW-ENGLAND HVDC SYSTEM AND DIGITAL CONTROLS WITH EMTP

The commissioning of the Quebec - New England multiterminal dc transmi ssion system underscores the increasing need to develop numerical mode ls for simulation purposes. The modern microprocessor-based HVDC conve rter controls used in this scheme make the modeling a real challenge s ince Electro-Magnetic Transient Program (EMTP) usually employed for si mulation purposes and its Transient Analysis of Control Systems (TACS) was designed to simulate analog, not digital controls. This paper giv es details about the modeling of digital controls with a modified EMTP version and presents some comparisons with HVDC simulator results whi ch show good agreement between the two power system analysis tools. A case of validation with field test result is also included in the pape r.