scispace - formally typeset

Operating point

About: Operating point is a(n) research topic. Over the lifetime, 8086 publication(s) have been published within this topic receiving 114895 citation(s). more


Journal ArticleDOI: 10.1109/TPEL.2005.850975
Abstract: Maximum power point tracking (MPPT) techniques are used in photovoltaic (PV) systems to maximize the PV array output power by tracking continuously the maximum power point (MPP) which depends on panels temperature and on irradiance conditions. The issue of MPPT has been addressed in different ways in the literature but, especially for low-cost implementations, the perturb and observe (PO moreover, it is well known that the P&O algorithm can be confused during those time intervals characterized by rapidly changing atmospheric conditions. In this paper it is shown that, in order to limit the negative effects associated to the above drawbacks, the P&O MPPT parameters must be customized to the dynamic behavior of the specific converter adopted. A theoretical analysis allowing the optimal choice of such parameters is also carried out. Results of experimental measurements are in agreement with the predictions of theoretical analysis. more

Topics: Maximum power point tracking (65%), Maximum power principle (55%), Operating point (53%) more

2,474 Citations

Journal ArticleDOI: 10.1109/TPEL.2006.890003
Abstract: The analysis of the small-signal stability of conventional power systems is well established, but for inverter based microgrids there is a need to establish how circuit and control features give rise to particular oscillatory modes and which of these have poor damping. This paper develops the modeling and analysis of autonomous operation of inverter-based microgrids. Each sub-module is modeled in state-space form and all are combined together on a common reference frame. The model captures the detail of the control loops of the inverter but not the switching action. Some inverter modes are found at relatively high frequency and so a full dynamic model of the network (rather than an algebraic impedance model) is used. The complete model is linearized around an operating point and the resulting system matrix is used to derive the eigenvalues. The eigenvalues (termed "modes") indicate the frequency and damping of oscillatory components in the transient response. A sensitivity analysis is also presented which helps identifying the origin of each of the modes and identify possible feedback signals for design of controllers to improve the system stability. With experience it is possible to simplify the model (reduce the order) if particular modes are not of interest as is the case with synchronous machine models. Experimental results from a microgrid of three 10-kW inverters are used to verify the results obtained from the model more

Topics: Inverter (56%), Microgrid (54%), Operating point (52%) more

2,071 Citations

Open accessJournal ArticleDOI: 10.1109/TPAS.1974.293972
O. Alsac1, B. Stott1Institutions (1)
Abstract: The Dommel-Tinney approach to the calculation of optimal power-system load flows has proved to be very powerful and general. This paper extends the problem formulation and solution scheme by incorporating exact outage-contingency constraints into the method, to give an optimal steady-state-secure system operating point. The controllable system quantities in the base-case problem (e.g. generated MW, controlled voltage magnitudes, transformer taps) are optimised within their limits according to some defined objective, so that no limit-violations on other quantities (e. g. generator MVAR and current loadings, transmission-circuit loadings, load-bus voltage magnitudes, angular displacements) occur in either the base-case or contingency-case system operating conditions. more

Topics: Voltage regulation (56%), Operating point (55%), Optimal control (53%)

1,382 Citations

Open accessProceedings ArticleDOI: 10.1109/IAS.1994.345440
02 Oct 1994-
Abstract: This paper presents a viable transducerless rotor position and velocity estimation scheme for PWM inverter driven induction, synchronous, and reluctance machines with the capability of providing robust and accurate dynamic estimation independent of operating point, including zero and very high speeds, light and heavy loading. The injection of a balanced three-phase high frequency signal (500 to 2 kHz) generated by the inverter, followed by appropriate signal demodulation and processing combined with a closed-loop observer, enable the tracking of rotor magnetic saliencies from the machine terminals. Although rotor magnetic saliency is inherent within reluctance machines, and most synchronous machines, saliency in the induction machine is introduced via a modulation of the rotor slot leakage with minimal detrimental effects on the machine performance. Experimental verification for the induction machine is included. > more

Topics: Induction generator (54%), Machine control (54%), Magnetic reluctance (53%) more

833 Citations

Open accessBook
01 Oct 1973-
Abstract: If you really want to be smarter, reading can be one of the lots ways to evoke and realize. Many people who like reading will have more knowledge and experiences. Reading can be a way to gain information from economics, politics, science, fiction, literature, religion, and many others. As one of the part of book categories, operating systems theory always becomes the most wanted book. Many people are absolutely searching for this book. It means that many love to read this kind of book. more

655 Citations

No. of papers in the topic in previous years

Top Attributes

Show by:

Topic's top 5 most impactful authors

Serge Pierfederici

9 papers, 267 citations

Henry Shu-Hung Chung

7 papers, 249 citations

Pierluigi Siano

6 papers, 37 citations

Konstantin Turitsyn

6 papers, 80 citations

Masoud Abbaszadeh

6 papers, 7 citations

Network Information
Related Topics (5)

22.4K papers, 387.3K citations

90% related
Voltage regulation

35.3K papers, 472.9K citations

89% related
Control theory

299.6K papers, 3.1M citations

89% related

80.7K papers, 733.2K citations

89% related

25.7K papers, 395.3K citations

88% related