Stability Analysis and Stabilization Methods of DC Microgrid With Multiple Parallel-Connected DC–DC Converters Loaded by CPLs

Su, Mei; Liu, Zhangjie; Sun, Yang; Han, Hua; Hou, Xiaochao

doi:10.1109/tsg.2016.2546551

Cited by 206 publications

(120 citation statements)

References 31 publications

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“…As reported in the literature [2], [11]- [24], the inclusion of active loads such as CPLs is a very challenging scenario in which originally stable controllers (set-up under pure resistive conditions) do not work in general. In this case, the controllers obtained in both approaches fall also into instability.…”

Section: Behavior When Swapping Resistances By Active Cplsmentioning

confidence: 99%

“…Although [27] contains a truly remarkable contribution, capable to control non-trivial interconnections, it is actually acknowledged by the Authors that boundedness in the original traces is required, which is parametrized by a Lipschitz condition (see the paragraph right before equation (4), on page 560 of [27]). Unfortunately, this is not possible when the converter exhibits high amplitude oscillations as reported by [2], [11]- [24] for LVDC networks; since such transients violate the Lipschitz condition. Take for example the current i induced by a load that demands constant power P , i.e.…”

Section: E Main Advantages Of the Present Workmentioning

confidence: 99%

“…Since this task is difficult enough when using models, as shown in an extensive list of recent contributions, e.g. [2], [11]- [24], it is increasingly more challenging when full models are simply not available and controllers are set-up purely from data.…”

Section: Introductionmentioning

confidence: 99%

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Data-Driven Control of LVDC Network Converters: Active Load Stabilization

Ruiz-Martinez

Mayo-Maldonado

Escobar

et al. 2020

IEEE Trans. Smart Grid

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This paper addresses the (model-free) data-driven control of power converters, acting as distributed generators, in low voltage direct current (LVDC) networks (e.g. DC microgrids, DC distributed power systems, DC buses wit multiple sources and loads, etc.). Since traditional stand-alone control design, cannot guarantee stability when converters are connected to a network, it is proposed a deterministic solution that does not require the network model-an approach purely based on measurement data. This is a suitable way to overcome common issues when using a model-based approach, e.g. the use of an excessive number of variables and equations, the presence of un-modeled dynamics, unknown parameters and/or the lack of first principle model equations. To corroborate the advantages of the proposed approach, the present work addresses an extreme but also realistic scenario: weak networks with active loads, such as constant power loads (CPLs). It is also shown that the proposed scheme guarantees stability in a rigorous deterministic way-using a Lyapunov approach based on coefficient matrices directly constructed from data. Simulation results using a multibus LVDC distribution network, based on PSCAD/EMTDC, are provided as proof of concept. Index Terms-Data-driven control, distributed generators, LVDC networks, DC microgrids, DC buses, oscillations, stability, constant power loads. Recent contributions of model-based approaches include: [11]-[13], where feedback control techniques are proposed to stabilize power converters in the presence of CPLs. In [2],

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Section: Behavior When Swapping Resistances By Active Cplsmentioning

confidence: 99%

Section: E Main Advantages Of the Present Workmentioning

confidence: 99%

See 1 more Smart Citation

Data-Driven Control of LVDC Network Converters: Active Load Stabilization

Ruiz-Martinez

Mayo-Maldonado

Escobar

et al. 2020

IEEE Trans. Smart Grid

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“…To use TL431 and limit the maximum duty cycle, gain of two is applied to both V Pr and V * c . This gain has no effect on control law as same constant is multiplied in numerator and denominator of equation (12). The constraints for the stability in (23) and (26) becomes:…”

Section: Parameterization Of the Controllermentioning

confidence: 99%

Fixed frequency sliding mode control of renewable energy resources in DC micro grid

Yasin

Ashraf

Bhatti

et al. 2019

Asian Journal of Control

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The rising cost of fossil fuels, their high depleting rate and issues regarding environmental pollution have brought the attention of the researchers towards renewable energy technologies. Different renewable energy resources like wind turbines, fuel cells and solar cells are connected to DC micro grid through controllable power electronic converters. In presence of these diverse generation units, robust controllers are required to ensure good power quality and to regulate grid voltage. This paper presents a sliding mode control based methodology to address the above mentioned challenges. The proposed technique keeps the switching frequency constant so that electromagnetic compatibility (EMC) issues can be solved with conventional filter design. Parallel operation of converter in DC micro gird is considered. Chattering reduction and power quality improvement by harmonic cancellation is proposed. A scaled down hardware for unregulated 11.5 V to 17.5 V input and 24V output is designed and tested.The experimental results show good performance of the controller under different loads and uncertain input voltage conditions. Moreover, the results show the robustness of the closed loop system to sudden variations in load conditions. Furthermore, a significant improvement in power quality is achieved by harmonic cancellation of chattering in the output of the converters.

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“…To stabilize the voltage or power of dc loads, many methods have been used [6]- [7]. With the characteristics of fast response and high power density, the supercapacitor is regarded as an effective method to mitigate high frequency variations of loads and sources [8].…”

Section: Introductionmentioning

confidence: 99%