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The modular multilevel converter (MMC) is a competitive candidate for VSC-HVDC systems. However, the conventional HB-MMC can't block dc link fault current because of the freewheeling effect of diodes. To solve this problem, researchers proposed an account of sub-modules (SMs) with DC-fault current clearing capability. This paper summarizes the 2 basic criteria and provides a comprehensive review of...
We develop a general notion of rearrangement for certain metric groups, and prove a Hardy-Littlewood type inequality. Combining this with a characterization of the extreme points of the set of probability measures with bounded densities with respect to a reference measure, we establish a general min-entropy inequality for convolutions. Special attention is paid to the integers where a min-entropy...
With the widespread use of solar energy, the grid-connected photovoltaic (PV) systems based on solid state transformer (SST) have considerable prospect. This paper presents the design and demonstration of a three-phase 800-V/10-kV 1-MW SST for grid-connected PV system. The topology of the 10-kV/1-MW SST is designed as a modular structure containing the dual active bridge (DAB) converter and full bridge...
The neutral point (NP) potential self-balancing of five-level full bridge inverters with conventional modulation strategy is related to the modulation index. Both the voltages of two split-capacitors should be sampled and controlled, when the inverter operates with the low modulation index. Therefore, an improved modulation strategy is proposed to realize the NP potential self-balancing for five-level...
Multiport dc/dc converters are widely employed in renewable energy generation systems to provide stable power to key loads. A novel three-port converter topology that interfaces one source port, one bidirectional storage port, and one isolated load port is proposed based on a modified version of two interleaved half-bridge converters. An interleaved bidirectional buck-boost converter parasitized on...
PSS/E is a power system simulation and analysis software commonly used by operational department, which is mostly applied to analyze single case based on artificial operation mode model. PSS/E application mode that API secondary development is used to simulate and control full physical model is proposed in this paper. Full model of power grid is automatically created based on CIM/E model file that...
Sensor nodes carry limited, generally irreplaceable, power sources. Therefore, sensor network must focus on power conservation. It is possible to extend the lifetime of a network by controlling its topology through clustering. Overlapping Clustering find its wide applications such as inter-cluster routing, topology discovery, node localization, and recovery from cluster head failure and so on. Topology...
Target tracking in wireless sensor networks with limited recourses is a challenging problem. Thus, deployment of sensor nodes must focus on power conservation. It is possible to extend the lifetime of a network by controlling its topology through clustering. Topology control target tracking-oriented in wireless sensor network is proposed in this paper. When a target move to the sensing filed, cluster...
One of the most important constraints on wireless sensor network is the low power consumption. Therefore, topology of wireless sensor network must focus on power conservation. It is possible to extend the lifetime of a network by controlling its topology through clustering. Topology control target tracking-oriented based on overlapping clustering in wireless sensor network is proposed in this paper...
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