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The common-mode current casued by the parasitic parameters in the transformerless multilevel converters degrades the performance of converters and brings security issues. This paper presents a new zero common-mode voltage space vector modulation for common-mode voltage suppression in the five-level modular composited converter. Firstly, the common-mode equivalent circuit model of five-level modular...
Multi-level converters are widely employed in medium voltage grid-connected PV systems, since they feature better power quality and higher conversion efficiency compared with two-level converters. The conventional two-stage PV converter configuration with additional high step-up elements can satisfy the wide input voltage requirements, but results in reduced conversion efficiency and increased cost...
Single-phase transformerless inverters are widely employed in grid-connected photovoltaic systems, because they are light, inexpensive and most importantly, have high conversion efficiencies. The highly efficient and reliable inverter concept (HERIC) is a well-known topology for transformerless inverters. Theses inverters, however, suffer from high-frequency leakage current generated by parasitic...
The transformerless inverters are widely employed in grid-tied PV systems, since they feature higher efficiency and lower cost compared with the transformer based inverters. One of the critical problems for transformerless inverters is the common-mode leakage current issue, which leads to serious safety and EMI problems. This paper proposed an enhanced HERIC based single-phase transformerless inverter...
A new ultracapacitor-battery HESS based on bidirectional Z-Source topology is proposed in previous research for better energy and space utilization. By controlling the power of UCs and machine, the steady average battery current get controlled indirectly. However, for safety consideration, the dynamic performance of proposed HESS should be considered, so small signal model based on state-space average...
Leakage current is a critical issue in transformerless PV systems, which creates safety and EMI problems. The traditional full-bridge inverter using unipolar sinusoidal pulse-width modulation suffers from high-frequency leakage currents. To solve the problem, this paper proposes a singlephase inverter for transformerless PV generation systems. The proposed topology significantly reduces the leakage...
Large-scale freezing weather has various negative effects on power system reliability. This paper presents a method that can consider multiple factors to calculate the power system operational reliability in freezing weather. In the paper, wind speed, icing, power line flow and the hidden failure rate are included in the operational reliability analysis of freezing weather. To consider the stochastic...
In this paper, an optimization model based on Prony analysis is proposed for the parameter optimization of FACTS devices, so as to damp the inter-area low frequency oscillation in the power system. The dominant mode damping ratio derived from Prony analysis as the optimization objective is introduced and an amplify ratio constraint is also included. To handle the nonlinearity of the optimization model,...
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