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VF (Variable Frequency) based motor drive, which occupies a large proportion in total power load, is growing up rapidly these years. It shall affect the load model of power system greatly, for their characteristic is quite different from that of traditional asynchronous motor drive. Firstly, both the simulation and physical experiment on VF motor are carried out with voltage drop disturbs, and the...
This study presents an optimization control strategy to improve the ride-through capability of voltage source converter-based high voltage direct current (VSC-HVDC) systems under unbalanced network conditions. To facilitate simple implementation and flexible operation, the current references are derived and synthesized into one generalized equation that introduces two individually adaptable parameters...
A large number of distributed generations (DGs) in a distribution grid always belong to different operators. Therefore, the exact changes in operation state caused by each single DG, such as the allocation of power loss, should be determined. This study proposes a method combining power flow algorithm, sensitivity analysis, and multi-step integration. The total changes caused by all the DGs can then...
Power electronics based equipment, such as Railway Power Conditioner (RPC), are always used in traction substations for the purpose of negative sequence and reactive power compensation. However RPC use indirect compensation method and is affected by uncertainties in operation, such as unbalanced transformer parameters. Therefore, an Enhanced Railway Power Conditioner (ERPC) is proposed in this paper...
Different risk constraint represents the different decision-making process of decision-makers. This paper use the traditional Mean-Variance, Value at Risk and Conditional Value at Risk which are from financial engineering to establish the optimum order risk decision model under the assumption of normal distribution. In order to illustrate the characteristics of different risk measurement constraint,...
This paper illustrates a study on HVDC light for its enhancement of AC/DC hybrid transmission system and multi-infeed HVDC system. In the sense of the realizing independent controlling of active and reactive power, HVDC light is more effective compared to the conventional HVDC system. An AC/DC parallel transmission system and a three-infeed HVDC system are modeled using PSCAD/EMTDC. Simulations corresponding...
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