Results 191 to 200 of about 5,995,861 (234)

Zero-sequence current injection based power flow control strategy for grid inverter interfaced renewable energy systems

Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020
This paper deals with an energy management issue for the grid-connected renewable energy sources connected with unbalanced loads. In the grid-connected energy systems, conventional energy management methods are used to manage balanced active power ...
M. S. Aygen, Mustafa Inci
semanticscholar   +1 more source

Minimal zero-sum sequences over 〚 − m,n〛

Journal of Number Theory, 2019
Let \(G\) be an abelian group and let \(X\subset G\) be a nonempty finite subset. A sequence over \(X\) is a finite unordered sequence with terms from \(X\) and repetition is allowed. We say \(S\) is zero-sum if all terms of \(S\) sums zero. If \(S\) is a zero-sum sequence but any nonempty proper subsequence of \(S\) is not a zero-sum sequence, \(S ...
Zeng, Xiangneng, Deng, Guixin
openaire   +2 more sources

Signal processing of zero sequence voltage technique

2007 European Conference on Power Electronics and Applications, 2007
This paper deals with the implementation of the zero sequence voltage (ZSV) technique [4,7], which was exploited to determine the rotor position of the surface permanent magnet synchronous motor (SMPMSM). The method is based on the zero sequence voltage measurement, performed between the neutral point of AC machines and the mid-point of the inverter DC
STULRAJTER, M, SCELBA, G, C, CARUANA, VITTEK,J   +3 more
openaire   +1 more source

Research on Power Equalization of Three-Phase Cascaded H-Bridge Photovoltaic Inverter Based on the Combination of Hybrid Modulation Strategy and Zero-Sequence Injection Methods

IEEE transactions on industrial electronics (1982. Print), 2020
Due to the nonuniform solar irradiance, unequal ambient temperatures, or inconsistent degradation of photovoltaic (PV) modules in three-phase cascaded H-bridge (CHB) PV inverter, the unbalanced output power among PV modules will lead to the imbalanced ...
W. Mao, Xing Zhang, Tao Zhao, Yuhua Hu, Fusheng Wang, Zhiqiang Dai, R. Cao   +6 more
semanticscholar   +1 more source

Ternary sequence with zero correlation

Proceedings of the IEEE, 1967
A method of generating ternary sequences with zero cyclic correlation except for the spike for zero lag is described. The sequences are of length given by (3n-1)/2 where n is odd. A method of generating uncorrelated sequences derived from the ternary sequence modified by a Hadamard matrix is indicated.
openaire   +1 more source

Zeros of linear recurrence sequences

Publicationes Mathematicae Debrecen, 2000
A sequence \(U=\{u_n\}_{n\in \mathbb Z}\) of complex numbers is called a linear recurrence sequence if it satisfies a relation \(u_n=c_1u_{n-1}+\dots+c_t u_{n-t}\) with \(c_i\in \mathbb C\) and \(c_t\neq 0\). There is only one such relation for which \(t\) is minimal.
openaire   +1 more source

The Zero-Age Main Sequence

2012
We consider here a sequence of chemically homogeneous models in complete (mechanical and thermal) equilibrium with central hydrogen burning. All of them are composed of the same hydrogen-rich mixture, while the stellar mass M varies from model to model along the sequence.
Rudolf Kippenhahn, Alfred Weigert, Achim Weiss   +2 more
openaire   +1 more source

Zero-Sequence Current Suppression Strategy With Reduced Switching Frequency for Open-End Winding PMSM Drives With Common DC BUS

IEEE transactions on industrial electronics (1982. Print), 2019
Zero-sequence current (ZSC) is inevitable in the structure of an open-end winding permanent-magnet synchronous machine (OW-PMSM) system with a common dc bus due to the simultaneous existence of the ZSC loop and the zero-sequence voltage (ZSV) caused by ...
Wei Hu, H. Nian, Dan Sun
semanticscholar   +1 more source

A Zero-Sequence Component Injection Modulation Method With Compensation for Current Harmonic Mitigation of a Vienna Rectifier

IEEE transactions on power electronics, 2019
Owing to the operational characteristic of a Vienna rectifier, it is found that the traditional modulation method would result in the current distortion.
Wenlong Ding, Chenghui Zhang, F. Gao, Bin Duan, H. Qiu   +4 more
semanticscholar   +1 more source

Mitigation of Half-Cycle Saturation of Adjacent Transformers During HVDC Monopolar Operation—Part II: Detecting Zero-Sequence Fault Currents

IEEE Transactions on Power Delivery, 2020
This two-part paper presents a method to mitigate half-cycle saturation of transformers caused by monopolar operation of neighboring HVDC transmission lines while keeping the ability to detect the zero-sequence fault currents (ZSFC) when ground faults ...
Ming Yang, Digvijay Deswal, Francisco de Leόn   +2 more
semanticscholar   +1 more source