Topic
Voltage regulator
About: Voltage regulator is a research topic. Over the lifetime, 33536 publications have been published within this topic receiving 350859 citations.
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TL;DR: In this paper, the authors derived the ac-side impedance matrices (IMs) of the MMC with the open-loop and closed-loop voltage control and their relationship is also explicitly given.
Abstract: This paper addresses the small-signal stability of voltage-controlled modular multilevel converters (MMCs) feeding linear ac systems. By using the harmonic state-space (HSS) modeling method, the ac-side impedance matrices (IMs) of the MMC with the open-loop and closed-loop voltage control are derived and their relationship is also explicitly given. It is revealed that the ac voltage regulator has the same effect on the centered diagonal element of the IM of the MMC as that of two-level voltage-source converters (VSCs). Moreover, when the MMC is feeding linear ac loads, the return-ratio matrix of the cascaded system has an eigenvalue that is equal to the ratio between the centered diagonal element of the IM of the MMC and the load impedance, which, consequently, facilitates the stability evaluation by checking that single-input single-output impedance ratio as a necessary condition. These findings also provide physical insights into the subsynchronous oscillation (SSO) of the voltage-controlled MMC with the proportional-resonant (PR) regulator, and a proportional-integral-resonant (PIR) regulator is further introduced to mitigate the SSO. Finally, time-domain simulations verify the effectiveness of the theoretical analysis.
63 citations
Patent•
04 Feb 2000
TL;DR: A voltage regulator with an input terminal and an output terminal has a printed circuit board, a substrate mounted on the printed circuit boards, and a first flip-chip type integrated circuit chip mounted on a substrate as mentioned in this paper.
Abstract: A voltage regulator with an input terminal and an output terminal has a printed circuit board, a substrate mounted on the printed circuit board, and a first flip-chip type integrated circuit chip mounted on the substrate. The first integrated circuit chip includes a first power switch fabricated therein to alternately couple and decouple the input terminal to the output terminal. A filter is disposed to provide a substantially DC voltage at the output terminal, and a control circuit controls the power switch to maintain the DC voltage substantially constant.
63 citations
Patent•
IBM1
TL;DR: In this paper, a buck/boost circuit was proposed for achieving a DC voltage from an AC input voltage signal line without developing an inrush current from the AC input input voltage line, and a DC/DC converter circuit coupled to the buck-boost circuit for converting the DC voltage to a desired voltage level.
Abstract: Aspects for a power converter with power factor correction (PFC) circuit are described. The aspects include a buck/boost circuit for achieving a DC voltage from an AC input voltage signal line without developing an inrush current from the AC input voltage line, and a DC/DC converter circuit coupled to the buck/boost circuit for converting the DC voltage to a desired voltage level. The aspects are achieved in a straightforward, cost effective, and adaptable manner.
63 citations
Patent•
30 Mar 2000TL;DR: In this paper, a method for voltage detection and lockout is proposed, where a reference voltage is compared to a supply voltage to determine whether the voltage supply voltage is greater than the reference voltage.
Abstract: A method for voltage detection and lockout. The method of one embodiment first compares a reference voltage to a supply voltage to determine whether the voltage supply voltage is greater than the reference voltage. The reference voltage is validated by determining whether the reference voltage is at least a valid voltage potential. An unlock signal is generated if the supply voltage is greater than the reference voltage and if the reference voltage is valid.
63 citations
TL;DR: In this article, the authors present an overview on the various on-load tap changer (OLTC) voltage control schemes which are used to control the voltage in distribution networks containing renewable energy (RE) sources.
Abstract: Voltage control is an important method for regulating the feeder voltages in a distribution network. Various voltage control methods are used by distribution network operators (DNOs) in order to maintain the network voltages to be within an acceptable voltage level. Traditionally, on-load tap changer (OLTC) and automatic voltage control (AVC) relays are often employed in regulating the network voltages. However, the traditional voltage control techniques are no longer suitable when renewable energy (RE) sources are connected to the network because of the possibility of bidirectional power flows. The presence of reverse power flow will affect the feeder voltage profiles and influence the voltage control scheme practiced in the distribution system. This paper presents an overview on the various OLTC voltage control schemes which are used to control the voltage in distribution networks containing RE sources.
63 citations