Stability Criterion for Cascaded System With Constant Power Load

Wei, Du; Zhang, Junming; Zhang, Yang; Qian, Zhaoming

doi:10.1109/tpel.2012.2211619

Cited by 224 publications

(101 citation statements)

References 29 publications

(36 reference statements)

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“…, c) represents all the independent capacitor voltages; and γ jk is the inner connection between i j and v k , which can be 1, −1, or 0. The detailed derivation process is described in [27][28][29]. Several theorems on the stability of circuits have been derived and Theorem 5 will be used to analyze the stability of the LLC resonant converter.…”

Section: Stability Analysis Of Llc Resonant Convertermentioning

confidence: 99%

Stability Analysis and Trigger Control of LLC Resonant Converter for a Wide Operational Range

et al. 2017

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Abstract:The gain of a LLC resonant converter can vary with the loads that can be used to improve the efficiency and power density for some special applications, where the maximum gain does not apply at the heaviest loads. However, nonlinear gain characteristics can make the converters unstable during a major disturbance. In this paper, the stability of an LLC resonant converter during a major disturbance is studied and a trigger control scheme is proposed to improve the converter's stability by extending the converter's operational range. Through in-depth analysis of the gain curve of the LLC resonant converter, we find that the switching frequency range is one of the key factors determining the system's stability performance. The same result is also obtained from a mathematical point of view by utilizing the mixed potential function method. Then a trigger control method is proposed to make the LLC resonant converter stable even during a major disturbance, which can be used to extend the converter's operational range. Finally, experimental results are given to verify the analysis and proposed control scheme.

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Section: Stability Analysis Of Llc Resonant Convertermentioning

confidence: 99%

Stability Analysis and Trigger Control of LLC Resonant Converter for a Wide Operational Range

et al. 2017

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“…Moreover, the coupling effect and interactions between the PLL itself and the system impedance lead to a potential instability issue [25]. Therefore, studying microgrid stability considering CPLs is very important [26][27][28][29][30][31]. Large-signal study is used to explore the microgrid stability with CPL [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, studying microgrid stability considering CPLs is very important [26][27][28][29][30][31]. Large-signal study is used to explore the microgrid stability with CPL [29][30][31]. A traditional Proportional Integral (PI) controller has been extensively used to control the DG inverters [29].…”

Section: Introductionmentioning

confidence: 99%

“…A traditional Proportional Integral (PI) controller has been extensively used to control the DG inverters [29]. Many studies show that fixed-gain PI controllers cannot easily acclimate to load changes and disturbances, especially in large microgrids [30]. Many trial-and-error-based studies have significant drawbacks such as optimal settings difficulties and being time-consuming [12,32,33].…”

Section: Introductionmentioning

confidence: 99%

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Optimal Design and Real Time Implementation of Autonomous Microgrid Including Active Load

2018

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Abstract:Controller gains and power-sharing parameters are the main parameters affect the dynamic performance of the microgrid. Considering an active load to the autonomous microgrid, the stability problem will be more involved. In this paper, the active load effect on microgrid dynamic stability is explored. An autonomous microgrid including three inverter-based distributed generations (DGs) with an active load is modeled and the associated controllers are designed. Controller gains of the inverters and active load as well as Phase Locked Loop (PLL) parameters are optimally tuned to guarantee overall system stability. A weighted objective function is proposed to minimize the error in both measured active power and DC voltage based on time-domain simulations. Different AC and DC disturbances are applied to verify and assess the effectiveness of the proposed control strategy. The results demonstrate the potential of the proposed controller to enhance the microgrid stability and to provide efficient damping characteristics. Additionally, the proposed controller is compared with the literature to demonstrate its superiority. Finally, the microgrid considered has been established and implemented on real time digital simulator (RTDS). The experimental results validate the simulation results and approve the effectiveness of the proposed controllers to enrich the stability of the considered microgrid.

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“…generators, switching power converters, loads, etc.). Each subsystem is designed separately and its stability is thus assured by design; however, their interaction with each other in the overall system can display unstable behaviors (see [2], [20], [22]). In some cases, such interactions can be accurately modelled assuming that some components behave as constant power loads, leading to negative-impedance instability [3].…”

Section: Introductionmentioning

confidence: 99%