Synchronous reference frame

In low-cost permanent magnet synchronous motor (PMSM) drive systems, the rotor position is usually estimated based on the back-electromotive force. However, such estimation methods have the common drawback of having large errors in low-speed regions. In order to solve that drawback in the startup phase, the I-f startup method is studied as its compatibility with the FOC control structure. The purpose of such a method is to make the motor accelerate and overcome the low-speed threshold.

8p vialicene 02-07-2024 1 0   Download

Part 1 book "Analysis of synchronous machines" includes contents: Winding distribution in an ideal machine, reference frame theory, the D–Q equations of a synchronous machine, steady state behavior of synchronous machines, transient analysis of synchronous machines.

331p dianmotminh01 14-05-2024 1 0   Download

This paper proposes a dead-time compensation method for 2-level voltage source inverters based on harmonic current controllers. The sixth harmonic of the stator current in the synchronous reference frame originated from the dead-time effect is attenuated by using current resonant controllers. The resonant controllers are connected in parallel with the conventional PI current regulator.

5p viannee 02-08-2023 10 4   Download

This research proposes the dynamic stability improvement of a large-scale power system which consists of a conventional synchronous generator (SG)-based power plant integrated with a doubly-fed induction generator (DFIG)-based wind farm by using a generalized unified power-flow controller (GUPFC). The complete dynamic mathematical equations of the studied system are established in dq-axis reference frame under three-phase balanced conditions.

8p vidoctorstrange 06-05-2023 3 2   Download

Lecture Power system stability - Lesson 7: Stability Overview, Synchronous Machine Modeling provide students with knowledge about symmetric line spacing – 69 kV; returning to the simulation: generator angles on different reference frames; plot designer with new plots with the wscc nine bus case; dynamic load models;...

51p hanthienngao 15-04-2022 16 1   Download

In this paper, a nonlinear control scheme for dynamic voltage restorer (DVR) is proposed to reduce the voltage disturbances for loads under grid voltage sags and nonlinear loads. First, the nonlinear model of the system consisting of LC filter is obtained in the dq0 synchronous reference frame.

7p viaespa2711 31-07-2021 20 1   Download

A novel control scheme for power converters of doubly-fed induction generator (DFIG) wind turbine system has been proposed to mitigate the current oscillations due to grid voltage unbalance. With this proposed scheme, the current controller is designed in the synchronous reference frame and composed of a proportional integral (PI) controller and a repetitive controller. Thus, the proposed controller gives better performance of the DFIG wind turbine system, compared with the existing dual PI one.

10p kequaidan8 02-11-2020 16 1   Download

An updated approach to reference frame analysis of electric machines and drive systems Since the first edition of Analysis of Electric Machinery was published, the reference frame theory that was detailed in the book has become the universally accepted approach for the analysis of both electric machines and electric drive systems. Now in its second edition, Analysis of Electric Machinery and Drive Systems presents, in one resource, the application of this theory to the analysis, simulation, and design of the complete drive system including the machine, converter, and control....

632p nguyenthai_thinh 21-03-2013 136 50   Download

Time is inherently important to the function of routers and networks. It provides the only frame of reference between all devices on the network. This makes synchronized time extremely important. Without synchronized time,accurately correlating information between devices becomes difficult,if not impossible. When it comes to security,if you cannot successfully compare logs between each of your routers and all your network servers,you will find it very hard to develop a reliable picture of an incident.

12p vinhnghi 27-08-2009 96 14   Download