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Digital-analog hybrid simulation method combines the advantages of both real-time digital simulation and physical simulation, and will be an effective means for the simulation and analysis of future power system. However, the ideal transformer model (ITM), as the most widely used interface algorithm, is easy to encounter instability issues. A novel impedance compensation algorithm based on ITM is...
In this paper, a low-profile microstrip monopole antenna with an ultrawide bandwidth (UWB) is proposed. Via holes, rectangular patches, and a tune stub connecting ground plate are employed to improve the gain and impedance bandwidth of the antenna. Meanwhile, the antenna is etched on a single-layer substrate lowering the cost and complexity of manufacturing process. HFSS software is used to design...
In this paper, a compact bandpass filter (BPF) with improved stopband characteristics using novel stepped impedance resonators (SIRs) is proposed. The conventional low-impedance stub of SIR is replaced by radial stubs, owing to its intrinsic wide stopband characteristics; the stopband rejection can be widened. A new BPF centered at 1.57 GHz has been designed and fabricated to verify the validity of...
A compact third-order bandpass filter (BPF) with enhanced stopband characteristics is proposed in this paper. The filter consists of two stepped impedance resonators (SIRs) and a new resonator named closed loop SIR. The closed loop SIR which is embedded into the other two resonators for compact size is not the real structure of SIR, but it is similar to the conventional λ/4 SIR in some characters...
A compact third-order bandpass filter (BPF) with enhanced stopband characteristics is proposed in this paper. The filter consists of two stepped impedance resonators (SIRs) and a new resonator named closed loop SIR. The closed loop SIR which is embedded into the other two resonators for compact size is not the real structure of SIR, but it is similar to the conventional λ/4 SIR in some characters...
In this paper, a compact bandpass filter (BPF) with improved stopband characteristics using novel stepped impedance resonators (SIRs) is proposed. The conventional low-impedance stub of SIR is replaced by radial stubs, owing to its intrinsic wide stopband characteristics; the stopband rejection can be widened. A new BPF centered at 1.57 GHz has been designed and fabricated to verify the validity of...
The small impedance branch may result in the divergence of Newton power flow both in rectangular form and in polar form. Analysis indicates the configuration of the Jacobian matrix counts for much to the convergence of Newton power flow in rectangular form when it is employed in systems with small impedance branches. The divergence problem can be avoided by modifying the Jacobian matrix, so a constructing...
The small impedance branch has a great significant effect on the convergence of the power flow methods. Whether the power flow converges or not when it used for systems with small impedance branches not only depends on the power flow methods but also the representation of the network elements. The backward forward sweep (BFS) method which is widely used for distribution networks is discussed in the...
Small impedance branches may lead to divergence of power flow. The convergence of power flow can be improved by some methods, such as improving voltage start, improving the Jacobian matrix, and using fast decoupled power flow. This paper investigates these methods, and finds out that when these methods are applied to systems with small impedance branches, they possess same characteristic, that is...
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