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This paper discusses the applicability of a Full-Bridge MMC and a Half-bridge MMC to tap an LCC-HVDC. The suitability of the two types of converters has been evaluated by considering the performance of the LCC-HVDC system under AC and DC fault conditions. The energization sequences control and protection modifications to the LCC-HVDC system, equipment requirements associated with each converter technology...
This paper applies frequency scanning techniques to the calculation of multi-infeed interaction factor (MIIF) at harmonic frequencies as a screening method for harmonic interactions of HVDC systems. The frequency scan technique is compared with the EMT simulations based current injection method, which is commonly used for MIIF calculations, for a set of test cases and is shown to be a faster, convenient...
This paper introduces a new method of controlling the arm currents in a VSC called direct current control. This method is a viable alternative to the commonly used decoupled control technique. The main advantages of this method are the simplicity and ease of tuning. It also makes it easy to apply a limit on the arm current orders. Although only the application of the method to a STATCOM controller...
This paper presents the application of a Full-bridge modular multi-level converter (FB-MMC) to tap an existing LCC-HVdc system. During faults, the dc voltage of the FB-MMC is controlled to reduce the fault current instead of blocking the converters. Electromagnetic Transient Simulations performed with PSCAD has been used to demonstrate the performance of the proposed system. Control strategies have...
Manitoba Hydro is currently making plans for the development of Bipole III (BPIII), a 2300MW, +/-500kV HVdc Bipole that will run from Northern Manitoba to the Load centre in the south over a length of approximately 1300km. Both LCC and VSC options are considered for the new BPIII HVdc scheme [1]-[2]. One of the features being investigated is the option to parallel the new Bipole III converters with...
Due to the fast-growing presence of VSC technology on the market and advancements including reduced losses, ability to operate at higher currents and using overhead lines, preliminary studies were undertaken to evaluate the feasibility of using VSC technology for the third HVdc Bipole III planned for Manitoba. Manitoba currently has two conventional LCC HVdc Bipoles I and II. Studies showed a VSC...
The grid power flow controller (GPFC) is a new concept in system technology within the FACTS family of devices that provides an economic solution for the purpose of power transmission between two or more adjacent AC systems. The AC systems can be either synchronous or nonsynchronous. The most proper power rating is between 10 MW and 300 MW, although higher ratings are also achievable.
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