Shipboard Microgrids: A Novel Approach to Load Frequency Control

Khooban, Mohammad‐Hassan; Dragičević, Tomislav; Blaabjerg, Frede; Delimar, Marko

doi:10.1109/tste.2017.2763605

Cited by 174 publications

(97 citation statements)

References 36 publications

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“…is work proposes a novel backstepping control law which is proposed for the marine power systems (1)- (7). ese dynamics are not in the form of the conventional strict-feedback forms as the virtual inputs P H 2 and P O 2 are not affine in (2) and the overall dynamics comprise three control inputs. So, the conventional backstepping design procedure [32] is not applicable.…”

Section: Remark 1 (Difficulties Of the Design Of The Proposed Controlmentioning

confidence: 99%

“…According to the International Maritime Organization (IMO), the massive marine transport system streaming through oceans and seas accounts for 2% of the global world CO 2 emission. Nevertheless, vessels play a signi cant role in the international trading system, providing occupations and transportation as well as supporting o shore businesses like shing [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

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Tracking Control for Hydrogen Fuel Cell Systems in Zero‐Emission Ferry Ships

2019

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For more than a century, conventional marine vessels spatter the atmosphere with CO2 emissions and detrimental particles when operated by diesel motors/generators. Fuel cells have recently emerged as one of the most promising emission-free technologies for the electrification of ship propulsion systems. In fuel cell-based ship electrification, the entire marine power system is viewed as a direct current (DC) microgrid (MG) with constant power loads (CPLs). A challenge of such settings is how to stabilize the voltages and currents of the ship’s grid. In this paper, we propose a new modified backstepping controller to stabilize the MG voltage and currents. Finally, to study the performance and efficiency of our proposal, we run an experiment simulation using dSPACE real-time emulator.

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Section: Remark 1 (Difficulties Of the Design Of The Proposed Controlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tracking Control for Hydrogen Fuel Cell Systems in Zero‐Emission Ferry Ships

2019

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“…owadays, driven by environmental benefits, improving systems' performance and the high price of fossil fuels, renewable energies have attracted significant research interest. Advancement of power electronic systems has also caused a trend toward the realization of more efficient electric aircrafts [1], electric ships [2], and electric vehicles [3], which are all power electronics intensive technologies. Conventional aircrafts were driven by electrical, mechanical, pneumatic, and hydraulic systems [4].…”

Section: Introductionmentioning

confidence: 99%

Tracking Control for a DC Microgrid Feeding Uncertain Loads in More Electric Aircraft: Adaptive Backstepping Approach

Yousefizadeh

Bendtsen

Vafamand

et al. 2019

IEEE Trans. Ind. Electron.

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More electric aircrafts (MEAs) comprise a vast amount of power electronic loads, which usually behave as constant power loads (CPLs). The incremental negative impedance of CPLs threatens system stability. To ensure an effective control of power flow in MEAs, eliminating the undesired behavior of CPLs is a necessity. This aim requires spontaneous power estimation of the time-varying uncertain loads. In this paper, an adaptive backstepping controller, which is interconnected to a 3 rd degree cubature Kalman filter (CKF), is developed for a DC MG feeding non-ideal CPLs. At first, the load power is considered as an artificial state and augmented into the system states, which enables estimation of not only the DC MG states but also the unknown value of the load power. The estimated load power is then forwarded to a backstepping controller. The systematic approach of this controller allows obtaining the control signal, which is the duty ratio of the switch, to not only system stabilizing but also tracking a desired voltage of the DC bus under the load power variations. The proposed adaptive controller is tested on a DC MG that has one CPL. The conducted experimental results verify the proposed nonlinear control in tracking the desired voltage of the DC bus under slow and fast variations of the load power.Index Terms-More electric aircraft power system, DC microgrid (MG), Constant power load (CPL), Cubature Kalman filter (CKF), Adaptive backstepping controller.

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“…The complexity of the microgrid increases when more sources and loads are replaced by the power electronics interfaces. Microgrids based solely on power electronic converters can be already found on ships, airplanes and tractions systems [1][2][3]. To reach power system with 100 percent renewable energy generation, the power system should rely on grid-forming converters to regulate AC voltage and frequency [4].…”

Section: Introductionmentioning

confidence: 99%

Using High-Bandwidth Voltage Amplifier to Emulate Grid-Following Inverter for AC Microgrid Dynamics Studies

et al. 2019

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AC microgrid is an attractive way to energize local loads due to remotely located renewable generation. The AC microgrid can conceptually comprise several grid-forming and grid-following power converters, renewable energy sources, energy storage and local loads. To study the microgrid dynamics, power-hardware-in-the-loop (PHIL)-based test setups are commonly used since they provide high flexibility and enable testing the performance of real converters. In a standard PHIL setup, different components of the AC microgrid exist as real commercial devices or electrical emulators or, alternatively, can be simulated using real-time simulators. For accurate, reliable and repeatable results, the PHIL-setup should be able to capture the dynamics of the microgrid loads and sources as accurately as possible. Several studies have shown how electrical machines, dynamic RLC loads, battery storages and photovoltaic and wind generators can be emulated in a PHIL setup. However, there are no studies discussing how a three-phase grid-following power converter with its internal control functions should be emulated, regardless of the fact that grid-following converters (e.g., photovoltaic and battery storage inverters) are the basic building blocks of AC microgrids. One could naturally use a real converter to represent such dynamic load. However, practical implementation of a real three-phase converter is much more challenging and requires special knowledge. To simplify the practical implementation of microgrid PHIL-studies, this paper demonstrates the use of a commercial high-bandwidth voltage amplifier as a dynamic three-phase power converter emulator. The dynamic performance of the PHIL setup is evaluated by identifying the small-signal impedance of the emulator with various control parameters and by time-domain step tests. The emulator is shown to yield the same impedance behavior as real three-phase converters. Thus, dynamic phenomena such as harmonic resonance in the AC microgrid can be studied in the presence of grid-following converters.

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Shipboard Microgrids: A Novel Approach to Load Frequency Control

Cited by 174 publications

References 36 publications

Tracking Control for Hydrogen Fuel Cell Systems in Zero‐Emission Ferry Ships

Tracking Control for Hydrogen Fuel Cell Systems in Zero‐Emission Ferry Ships

Tracking Control for a DC Microgrid Feeding Uncertain Loads in More Electric Aircraft: Adaptive Backstepping Approach

Using High-Bandwidth Voltage Amplifier to Emulate Grid-Following Inverter for AC Microgrid Dynamics Studies

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