The Experts below are selected from a list of 6141 Experts worldwide ranked by ideXlab platform

Luo Wang - One of the best experts on this subject based on the ideXlab platform.

  • diagnosis of inter turn short circuit of synchronous generator rotor winding based on volterra kernel identification
    Energies, 2018
    Co-Authors: Luo Wang
    Abstract:

    The inter-turn short circuit is a common fault in the synchronous generator. This fault is not easily detected at early stage. However, with the development of the fault, it will pose a threat to the safe operation of the generator. To detect the inter-turn short circuit of rotor winding, the feasibility of identifying the stator Branch characteristics of synchronous generator during inter-turn short circuit was analyzed. In this paper, an on-line fault identification method based on Volterra kernel identification is presented. This method uses the stator Branch Voltage and stator unbalance Branch current collected from the generator as input and output signals of the series model. Recursive batch least squares method is applied to calculate the three kernels of Volterra series. When the generator is in normal state or fault state, the Volterra kernel will change accordingly. Through the identification of the time-domain kernel of the nonlinear transfer model, the inter-turn short circuit fault of the synchronous generator is diagnosed. The correctness and effectiveness of this method is verified by using the data of fault experimental synchronous generator.

G A Cordero - One of the best experts on this subject based on the ideXlab platform.

  • quasi coupled three phase radial load flow
    IEEE Transactions on Power Systems, 2004
    Co-Authors: Esther Romero Ramos, A G Exposito, G A Cordero
    Abstract:

    Ignoring mutual coupling in three-phase load-flow computations saves a lot of computational effort but provides inaccurate results for many applications. In this paper, the effect of mutual coupling is taken into account through equivalent Branch Voltage sources or bus current injections. This simple idea allows accurate enough solutions to be obtained, while much of the computational saving associated with decoupled load flows is retained. Experiments on several unbalanced networks are reported showing the performance of the proposed idea when applied to distribution load flows based on the forward/backward tree sweeps.

Esther Romero Ramos - One of the best experts on this subject based on the ideXlab platform.

  • quasi coupled three phase radial load flow
    IEEE Transactions on Power Systems, 2004
    Co-Authors: Esther Romero Ramos, A G Exposito, G A Cordero
    Abstract:

    Ignoring mutual coupling in three-phase load-flow computations saves a lot of computational effort but provides inaccurate results for many applications. In this paper, the effect of mutual coupling is taken into account through equivalent Branch Voltage sources or bus current injections. This simple idea allows accurate enough solutions to be obtained, while much of the computational saving associated with decoupled load flows is retained. Experiments on several unbalanced networks are reported showing the performance of the proposed idea when applied to distribution load flows based on the forward/backward tree sweeps.

Yanjun Shi - One of the best experts on this subject based on the ideXlab platform.

  • short circuit protection of 1200v sic mosfet t type module in pv inverter application
    European Conference on Cognitive Ergonomics, 2016
    Co-Authors: Yuxiang Shi, Ren Xie, Lu Wang, Yanjun Shi
    Abstract:

    A de-sat based short-circuit protection scheme using commercial driver for SiC MOSFETs is presented and experimentally verified on 1200V 3-level T-type SiC MOSFET module in this paper. Response time is very critical for the short-circuit protection of SiC MOSFETs due to the limited short-circuit withstand time (SCWT). Soft turn-off is required to avoid high Voltage spike during the turn-off of the fault current. With the presented circuit, 600 ns response time is realized, and a two-stage soft turn-off circuit with gate Voltage clamping is implemented. A gate Voltage stabilizing circuit without affecting the switching loss is also proposed to prevent false trigger. Since de-sat protection scheme is not applicable for the neutral Branch of T-type module due to polarity changes of Branch Voltage, the short-circuit protection of neutral Branch is realized with the half-bridge device protection. Detail circuit design for the 1200 V T-type SiC module in 1 kV PV application is described, and experimental results demonstrate the effectiveness of the circuit.

A G Exposito - One of the best experts on this subject based on the ideXlab platform.

  • quasi coupled three phase radial load flow
    IEEE Transactions on Power Systems, 2004
    Co-Authors: Esther Romero Ramos, A G Exposito, G A Cordero
    Abstract:

    Ignoring mutual coupling in three-phase load-flow computations saves a lot of computational effort but provides inaccurate results for many applications. In this paper, the effect of mutual coupling is taken into account through equivalent Branch Voltage sources or bus current injections. This simple idea allows accurate enough solutions to be obtained, while much of the computational saving associated with decoupled load flows is retained. Experiments on several unbalanced networks are reported showing the performance of the proposed idea when applied to distribution load flows based on the forward/backward tree sweeps.