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The central objective of this paper is to investigate the harmonic behavior of 110-kV overhead lines. For this purpose, a method to describe the frequency-dependent series impedance and shunt admittance per unit length has been developed using the symmetrical components. The developed method uses input data that has been generated using the simulation software PSCAD. This paper begins by presenting...
The virtual power method can effectively decouple the inverter output active and reactive power. However, in case of parallel operation the output powers may not be shared very well because of the line impedances mismatching. Therefore, if the system impedances are set to be equal through the virtual impedance loop, then the virtual power loop can successfully share the power. This simply means unifying...
To fully incarnate the characteristic of the high luminous efficacy of the low pressure sodium lamp (LPS) and to optimize the efficiency of the system which is made up of the LPS and the electronic ballast, a detailed research on the system has been done. Theoretically, the luminous efficacy of the LPS and the efficiency of the electronic ballast are both vary obviously with the work frequency of...
The subsynchronous oscillation (SSO) phenomenon may occur in a modular multilevel converter-based high-voltage dc (MMC-HVDC) transmission system for wind farm integration, which has already been observed in the real world. In this paper, the generation mechanism of the SSO phenomenon in the interconnected system is revealed by means of impedance-based analysis. On this base, from the HVDC converter...
This paper presents an adaptive proportional resonant (PR) controller for single phase grid connected inverter that adapts its control parameters to grid impedance variations. Forth order band bass filter is designed and then integrated with the adaptive scheme for on-line detection of any variations in the resonance frequency. The estimated frequency is then processed by statistical signal processing...
this paper presents the comparative analysis of power converters topologies with impedance source. The analysis consist in the comparison between two power converter topologies: the first topology is a current source inverter (CSI) that incorporates SiC devices with Quasi-Z source impedance; the second topology is CSI power converter built using SiC devices that incorporates Trans-Z source impedance...
The “More Electrical Aircraft” concept involves a significant increase of power demand in modern aircrafts. In this context, a new high voltage DC distribution system has been proposed. This makes it necessary to develop a new generation of DC-DC converters to supply the 28VDC loads. These converters must comply with stringent requirements in terms of power density and electromagnetic compatibility...
This paper presents a Lyapunov-function based control approach with cascaded proportional-resonant (PR) controller for single-phase grid-tied LCL-filtered quasi-Z-source inverter (qZSI). The proposed control approach guarantees the global stability of the closed-loop system and zero steady-state error in the grid current. The reference values for the inverter current and capacitor voltage are generated...
Single-phase inverter suffers from double-frequency power ripples in the input side transferred there from the ac-side. To mitigate this ripple, two types of power decoupling approaches can be applied: passive power decoupling and active power decoupling. We present a technique of passive power decoupling realized by modifying the control strategy. The main idea is to produce the time-varying shoot-through...
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