The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The medium power rating two-level three phase voltage source inverter is among the most popular power conversion systems. The typical switching frequency of the commercial medium power rating inverter, however, is limited to tens of kHz. By increasing the switching frequency and using emerging gallium-nitride devices, the size of the overall system can be greatly reduced. This paper begins by reviewing...
To address the instability issue in renewable systems of a radial-line structure with multiple current-controlled interface inverters, this paper proposes a practical stability criterion to easily analyze the system stability and a controller parameter design method to guarantee stable system operation with good oscillation damping performance. The proposed impedance-based sufficient stability criterion...
The conventional droop control method, which does not require communication lines, is an effective control scheme to dispatch power among inverters in the microgrid. However, this method has inherent tradeoffs: frequency vs. active power accuracy and amplitude regulation vs. reactive power sharing accuracy. To cope with this problem, this paper presents a novel active power control strategy to improve...
Droop control and some improved droop control methods are adopted to control microgrid inverters not only in island mode, but also in grid-connected mode. This paper presents a state space model of three phase paralleled inverters in grid-connected microgrid based on droop control to facilitate the control design and stability analysis. This model is established in rotation framework based on modern...
This paper presents a decoupled and adaptive droop strategy to coordinate parallel operation of inverters. This strategy neatly combines a novel decouple method and an adaptive power sharing strategy. The decouple method guarantees the system stability by defining a pair of virtual power and utilizing a low pass filter to achieve dynamic decoupling. And the adaptive power sharing method is included...
This paper presents a small-signal model of parallel inverters based on the droop control method for power sharing in a stand-alone micro-grid. The control method for parallel inverters is based on the frequency-active power and amplitude-reactive power droops, which only depends on the local variable measurements. The small-signal stability is analyzed and some root locus plots are provided with...
This paper presents a novel wireless load-sharing control strategy, active droop positioning, for islanding parallel inverters in an ac-distributed system. Normally, the microgrid is intended to operate in islanded mode when the disconnection from the upstream MV network occurs. In this condition, the inverter-interfaced microsources acts as a voltage source, with the magnitude and frequency of the...
A 3-stage current-starved ring oscillator with 65.1% reduction in process variation in a 90 nm CMOS process is presented. The low variation is achieved without degrading the mean operating frequency through the implementation of an addition-based current source to replace a single transistor current source in each inverter stage. No post-fabrication trimming or calibration is required. Circuit simulations...
A 3-stage current-starved ring oscillator with 65.1% reduction in process variation in a 90 nm CMOS process is presented. The low variation is achieved without degrading the mean operating frequency through the implementation of an addition-based current source to replace a single transistor current source in each inverter stage. No post-fabrication trimming or calibration is required. Circuit simulations...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.