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Tianhao Tang
The Institute of Power Drive and Control, Shanghai Maritime University, 1550 Haigang Ave., Shanghai 201306, China

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Journal article
Published: 16 July 2021 in Entropy
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Organic Rankine Cycle (ORC) is an effective way to recycle waste heat sources of a marine diesel engine. The aim of the present paper is to analyze and optimize the thermoeconomic performance of a Series Heat Exchangers ORC (SHEORC) for recovering energy from jacket water, scavenge air, and exhaust gas. The three sources are combined into three groups of jacket water (JW)→exhaust gas (EG), scavenge air (SA)→exhaust gas, and jacket water→scavenge air→exhaust gas. The influence of fluid mass flow rate, evaporation pressure, and heat source recovery proportion on the thermal performance and economic performance of SHEORC was studied. A single-objective optimization with power output as the objective and multi-objective optimization with exergy efficiency and levelized cost of energy (LCOE) as the objectives are carried out. The analysis results show that in jacket water→exhaust gas and jacket water→scavenge air→exhaust gas source combination, there is an optimal heat recovery proportion through which the SHEORC could obtain the best performance. The optimization results showed that R245ca has the best performance in thermoeconomic performance in all three source combinations. With scavenge air→exhaust, the power output, exergy efficiency, and LCOE are 354.19 kW, 59.02%, and 0.1150 $/kWh, respectively. Integrating the jacket water into the SA→EG group would not increase the power output, but would decrease the LCOE.

ACS Style

Youyi Li; Tianhao Tang. Performance Analysis and Optimization of a Series Heat Exchangers Organic Rankine Cycle Utilizing Multi-Heat Sources from a Marine Diesel Engine. Entropy 2021, 23, 906 .

AMA Style

Youyi Li, Tianhao Tang. Performance Analysis and Optimization of a Series Heat Exchangers Organic Rankine Cycle Utilizing Multi-Heat Sources from a Marine Diesel Engine. Entropy. 2021; 23 (7):906.

Chicago/Turabian Style

Youyi Li; Tianhao Tang. 2021. "Performance Analysis and Optimization of a Series Heat Exchangers Organic Rankine Cycle Utilizing Multi-Heat Sources from a Marine Diesel Engine." Entropy 23, no. 7: 906.

Journal article
Published: 17 June 2021 in Journal of Marine Science and Engineering
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With the rapid development of renewable energy technology, marine current energy is treated as the most desirable form of ocean energies. Due to the nature of marine current energy, simple structure, high reliability, and good control performance are the primary consideration for the energy management strategy. This paper proposes an energy management control strategy based on rules to compensate for the fluctuating power caused by tidal motion. The hybrid energy storage system composed of vanadium redox flow battery (VRB) is applied to reallocate power. Supercapacitor banks (SCBs) are applied as the auxiliary power source to absorb or release the required power according to energy management strategy based on control rules in the marine current power system. SCB makes the grid-connected power track the grid command power and also improves the operational efficiency of the vanadium redox flow battery (VRB). VRB compensates for the low-frequency fluctuating power caused by tidal motion and plays an important role in compensating for the difference in power between the grid-connected power and the grid command power to ensure the reliability of the marine current power system. A simulation model of a 3 MW marine current power system is built to verify the effectiveness of the energy management strategy based on the real marine current velocity data.

ACS Style

Jingang Han; Xu Li; Tianhao Tang. Energy Management Using a Rule-Based Control Strategy of Marine Current Power System with Energy Storage System. Journal of Marine Science and Engineering 2021, 9, 669 .

AMA Style

Jingang Han, Xu Li, Tianhao Tang. Energy Management Using a Rule-Based Control Strategy of Marine Current Power System with Energy Storage System. Journal of Marine Science and Engineering. 2021; 9 (6):669.

Chicago/Turabian Style

Jingang Han; Xu Li; Tianhao Tang. 2021. "Energy Management Using a Rule-Based Control Strategy of Marine Current Power System with Energy Storage System." Journal of Marine Science and Engineering 9, no. 6: 669.

Journal article
Published: 26 May 2021 in Journal of Marine Science and Engineering
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This paper firstly adopts a fault accommodation structure, a five-phase permanent magnet synchronous generator (PMSG) with trapezoidal back-electromagnetic forces, in order to enhance the fault tolerance of tidal current energy conversion systems. Meanwhile, a fault-tolerant control (FTC) method is proposed using multiple second-order generalized integrators (multiple SOGIs) to further improve the systematic fault tolerance. Then, additional harmonic disturbances from phase current or back-electromagnetic forces in original and Park’s frames are characterized under a single-phase open condition. Relying on a classical field-oriented vector control scheme, fault-tolerant composite controllers are then reconfigured using multiple SOGIs by compensating q-axis control commands. Finally, a real power-scale simulation setup with a gearless back-to-back tidal current energy conversion chain and a small power-scale laboratory prototype in machine side are established to comprehensively validate feasibility and fault tolerance of the proposed method. Simulation results show that the proposed method is able to suppress the main harmonic disturbances and maintain a satisfactory fault tolerance when third harmonic flux varies. Experimental results reveal that the proposed model-free fault-tolerant design is simple to implement, which contributes to better fault-tolerant behaviors, higher power quality and lower copper losses. The main advantage of the multiple SOGIs lies in convenient online implementation and efficient multi-harmonic extractions, without considering system’s model parameters. The proposed FTC design provides a model-free fault-tolerant solution to the energy harvested process of actual tidal current energy conversion systems under different working conditions.

ACS Style

Zhuo Liu; Tianhao Tang; Azeddine Houari; Mohamed Machmoum; Mohamed Benkhoris. An FTC Design via Multiple SOGIs with Suppression of Harmonic Disturbances for Five-Phase PMSG-Based Tidal Current Applications. Journal of Marine Science and Engineering 2021, 9, 574 .

AMA Style

Zhuo Liu, Tianhao Tang, Azeddine Houari, Mohamed Machmoum, Mohamed Benkhoris. An FTC Design via Multiple SOGIs with Suppression of Harmonic Disturbances for Five-Phase PMSG-Based Tidal Current Applications. Journal of Marine Science and Engineering. 2021; 9 (6):574.

Chicago/Turabian Style

Zhuo Liu; Tianhao Tang; Azeddine Houari; Mohamed Machmoum; Mohamed Benkhoris. 2021. "An FTC Design via Multiple SOGIs with Suppression of Harmonic Disturbances for Five-Phase PMSG-Based Tidal Current Applications." Journal of Marine Science and Engineering 9, no. 6: 574.

Journal article
Published: 16 December 2020 in Energies
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In recent years, multi-phase permanent magnet synchronous generators (PMSGs) have become attractive in the field of tidal current energy conversion systems (TCECS) due to their high-power density, reliability, and availability. However, external disturbances and malfunctions in power conversion chains will bring challenges to achieving stable and continuous tidal current energy harnessing. Using generalized proportional integral observers, an active fault-tolerant control (AFTC) strategy is therefore proposed for a five-phase PMSG based TCECS that is subjected to an open switch fault (OSF) in the generator side converter. This proposed AFTC strategy is applied into q-axis current control loops, which contain fault detection and compensation. The fault compensator will be smoothly activated using a sigmoid function once the OSF is detected. Finally, a small-scale power experimental platform emulating the TCECS is established in order to verify the feasibility and efficiency of the proposed FTC strategy. Experiment results show that this AFTC strategy can detect faults rapidly and effectively attenuate torque ripples in the post-fault operation mode.

ACS Style

Zhuo Liu; Azeddine Houari; Mohamed Machmoum; Mohamed-Fouad Benkhoris; Tianhao Tang. An Active FTC Strategy Using Generalized Proportional Integral Observers Applied to Five-Phase PMSG based Tidal Current Energy Conversion Systems. Energies 2020, 13, 6645 .

AMA Style

Zhuo Liu, Azeddine Houari, Mohamed Machmoum, Mohamed-Fouad Benkhoris, Tianhao Tang. An Active FTC Strategy Using Generalized Proportional Integral Observers Applied to Five-Phase PMSG based Tidal Current Energy Conversion Systems. Energies. 2020; 13 (24):6645.

Chicago/Turabian Style

Zhuo Liu; Azeddine Houari; Mohamed Machmoum; Mohamed-Fouad Benkhoris; Tianhao Tang. 2020. "An Active FTC Strategy Using Generalized Proportional Integral Observers Applied to Five-Phase PMSG based Tidal Current Energy Conversion Systems." Energies 13, no. 24: 6645.

Journal article
Published: 21 October 2020 in Electronics
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With the increasing importance of power accumulator batteries in electric vehicles, the accurate characteristics of power accumulator batteries have an important role. In order to evaluate the power accumulator battery, battery charging and discharging is indispensable. In this article, a H-bridge bidirectional DC-DC converter is presented which can charge and discharge the battery with different voltage levels and one of the merits of this topology is that a wide output voltage range can be easily achieved. In the control part, a proportional-integral (PI) control strategy is adopted to ensure a stable and reliable operation of the converter. Furthermore, compared with the PI control strategy, a duty ratio feedforward control is utilized to obtain the rapid current dynamic response. In this article, firstly, the system configuration for battery charging and discharging is introduced, then the operating principles and mathematical model of the DC-DC converter are analyzed and derived. Secondly, for bidirectional DC-DC converters, the PI control method and duty ratio feedforward control method are put forward and designed. Finally, the simulation model is established based on PSIM software and the experiment platform is also built in lab. The results of the simulation and experiment research show that the H-bridge bidirectional DC-DC converter can operate reliably and stably during the charging, discharging and power flow reverse modes. In addition, the dynamic response of the charging and discharging current can also be further improved by introducing the duty ratio feedforward control method.

ACS Style

Jingang Han; Xin Gu; Yi Yang; Tianhao Tang. Dynamic Improvement with a Feedforward Control Strategy of Bidirectional DC-DC Converter for Battery Charging and Discharging. Electronics 2020, 9, 1738 .

AMA Style

Jingang Han, Xin Gu, Yi Yang, Tianhao Tang. Dynamic Improvement with a Feedforward Control Strategy of Bidirectional DC-DC Converter for Battery Charging and Discharging. Electronics. 2020; 9 (10):1738.

Chicago/Turabian Style

Jingang Han; Xin Gu; Yi Yang; Tianhao Tang. 2020. "Dynamic Improvement with a Feedforward Control Strategy of Bidirectional DC-DC Converter for Battery Charging and Discharging." Electronics 9, no. 10: 1738.

Journal article
Published: 28 April 2020 in Journal of Marine Science and Engineering
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This study mainly investigates the current and speed control strategies of a doubly-fed induction generator (DFIG), which is applied to a tidal stream turbine (TST). Indeed, DFIG using integer-order PI (IOPI) controller has been widely proposed in the applications with a similar system, especially in wind energy conversion system (WECS). However, these conventional controllers cannot deal with the problems caused by the parameter variations satisfactorily under complex and harsh operation conditions, and may even deteriorate the performance. As a result, a fractional-order PI (FOPI) controller is considered to improve the efficiency and performance of DFIG-based TST in this paper. The FOPI controller, developed from the traditional IOPI controller and the fractional calculus theory, has a lot of prominent merits in many aspects, such as robustness, stability, and dynamic performance. In this paper, the proposed control strategies are embedded into the whole TST model which contains the tidal stream turbine, and the generator. The obtained simulation results demonstrate the prominent effectiveness and advantages of the proposed strategies compared with the conventional IOPI controller in terms of overshoot, static error, adjustment time, and robustness. It implies that FOPI controller could be a good candidate in TST applications.

ACS Style

Hao Chen; Wei Xie; Xiyang Chen; Jingang Han; Nadia Aït-Ahmed; Zhibin Zhou; Tianhao Tang; Mohamed Benbouzid. Fractional-Order PI Control of DFIG-Based Tidal Stream Turbine. Journal of Marine Science and Engineering 2020, 8, 309 .

AMA Style

Hao Chen, Wei Xie, Xiyang Chen, Jingang Han, Nadia Aït-Ahmed, Zhibin Zhou, Tianhao Tang, Mohamed Benbouzid. Fractional-Order PI Control of DFIG-Based Tidal Stream Turbine. Journal of Marine Science and Engineering. 2020; 8 (5):309.

Chicago/Turabian Style

Hao Chen; Wei Xie; Xiyang Chen; Jingang Han; Nadia Aït-Ahmed; Zhibin Zhou; Tianhao Tang; Mohamed Benbouzid. 2020. "Fractional-Order PI Control of DFIG-Based Tidal Stream Turbine." Journal of Marine Science and Engineering 8, no. 5: 309.

Journal article
Published: 03 June 2019 in Energies
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Affected by high density, non-uniform, and unstructured seawater environment, fault detection of Marine Current Turbine (MCT) faces various fault features and strong interferences. To solve these problems, a harmonic analysis strategy based on zero-crossing estimation and Empirical Mode Decomposition (EMD) filter banks is proposed. First, the detection problems of rotor imbalance fault under strong interference conditions are described through an analysis of the fault mechanism and operation environment of MCT. Therefore, against various fault features, a zero-crossing estimation is proposed to calculate instantaneous frequency. Last, and in order to solve the problem that the frequency and amplitude of the operating parameters are partially or completely covered by interference, a band-pass filter based on EMD is used, together with a characteristic frequency selected by a Pearson correlation coefficient. This strategy can accurately detect the multiplicative faults under strong interference conditions, and can be applied to the MCT fault detection system. Theoretical and experimental results verify the effectiveness of the proposed strategy.

ACS Style

Milu Zhang; Tianzhen Wang; Tianhao Tang; Zhuo Liu; Christophe Claramunt. A Synchronous Sampling Based Harmonic Analysis Strategy for Marine Current Turbine Monitoring System under Strong Interference Conditions. Energies 2019, 12, 2117 .

AMA Style

Milu Zhang, Tianzhen Wang, Tianhao Tang, Zhuo Liu, Christophe Claramunt. A Synchronous Sampling Based Harmonic Analysis Strategy for Marine Current Turbine Monitoring System under Strong Interference Conditions. Energies. 2019; 12 (11):2117.

Chicago/Turabian Style

Milu Zhang; Tianzhen Wang; Tianhao Tang; Zhuo Liu; Christophe Claramunt. 2019. "A Synchronous Sampling Based Harmonic Analysis Strategy for Marine Current Turbine Monitoring System under Strong Interference Conditions." Energies 12, no. 11: 2117.

Journal article
Published: 26 August 2017 in Energies
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Cascaded H-bridge Multilevel Inverter (CHMI) is widely used in industrial applications thanks to its many advantages. However, the reliability of a CHMI is decreased with the increase of its levels. Fault diagnosis techniques play a key role in ensuring the reliability of a CHMI. The performance of a fault diagnosis method depends on the characteristics of the extracted features. In practice, some extracted features may be very similar to ensure a good diagnosis performance at some H-bridges of CHMI. The situation becomes even worse in the presence of noise. To fix these problems, in this paper, signal denoising and data preprocessing techniques are firstly developed. Then, a Principal Components Rearrangement method (PCR) is proposed to represent the different features sufficiently distinct from each other. Finally, a PCR-based fault diagnosis strategy is designed. The performance of the proposed strategy is compared with other fault diagnosis strategies, based on a 7-level CHMI hardware platform.

ACS Style

Zhuo Liu; Tianzhen Wang; Tianhao Tang; Yide Wang. A Principal Components Rearrangement Method for Feature Representation and Its Application to the Fault Diagnosis of CHMI. Energies 2017, 10, 1273 .

AMA Style

Zhuo Liu, Tianzhen Wang, Tianhao Tang, Yide Wang. A Principal Components Rearrangement Method for Feature Representation and Its Application to the Fault Diagnosis of CHMI. Energies. 2017; 10 (9):1273.

Chicago/Turabian Style

Zhuo Liu; Tianzhen Wang; Tianhao Tang; Yide Wang. 2017. "A Principal Components Rearrangement Method for Feature Representation and Its Application to the Fault Diagnosis of CHMI." Energies 10, no. 9: 1273.

Journal article
Published: 01 May 2017 in ISA Transactions
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This paper proposes an imbalance fault detection method based on data normalization and Empirical Mode Decomposition (EMD) for variable speed direct-drive Marine Current Turbine (MCT) system. The method is based on the MCT stator current under the condition of wave and turbulence. The goal of this method is to extract blade imbalance fault feature, which is concealed by the supply frequency and the environment noise. First, a Generalized Likelihood Ratio Test (GLRT) detector is developed and the monitoring variable is selected by analyzing the relationship between the variables. Then, the selected monitoring variable is converted into a time series through data normalization, which makes the imbalance fault characteristic frequency into a constant. At the end, the monitoring variable is filtered out by EMD method to eliminate the effect of turbulence. The experiments show that the proposed method is robust against turbulence through comparing the different fault severities and the different turbulence intensities. Comparison with other methods, the experimental results indicate the feasibility and efficacy of the proposed method.

ACS Style

Milu Zhang; Tianzhen Wang; Tianhao Tang; Mohamed Benbouzid; Demba Diallo. An imbalance fault detection method based on data normalization and EMD for marine current turbines. ISA Transactions 2017, 68, 302 -312.

AMA Style

Milu Zhang, Tianzhen Wang, Tianhao Tang, Mohamed Benbouzid, Demba Diallo. An imbalance fault detection method based on data normalization and EMD for marine current turbines. ISA Transactions. 2017; 68 ():302-312.

Chicago/Turabian Style

Milu Zhang; Tianzhen Wang; Tianhao Tang; Mohamed Benbouzid; Demba Diallo. 2017. "An imbalance fault detection method based on data normalization and EMD for marine current turbines." ISA Transactions 68, no. : 302-312.

Journal article
Published: 28 April 2014 in Energies
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All-electric ships are now a standard offering for energy/propulsion systems in boats. In this context, integrating fuel cells (FCs) as power sources in hybrid energy systems can be an interesting solution because of their high efficiency and low emission. The energy management strategy for different power sources has a great influence on the fuel consumption, dynamic performance and service life of these power sources. This paper presents a hybrid FC/battery power system for a low power boat. The hybrid system consists of the association of a proton exchange membrane fuel cell (PEMFC) and battery bank. The mathematical models for the components of the hybrid system are presented. These models are implemented in Matlab/Simulink environment. Simulations allow analyzing the dynamic performance and power allocation according to a typical driving cycle. In this system, an efficient energy management system (EMS) based on operation states is proposed. This EMS strategy determines the operating point of each component of the system in order to maximize the system efficiency. Simulation results validate the adequacy of the hybrid power system and the proposed EMS for real ship driving cycles.

ACS Style

Jingang Han; Jean-Frederic Charpentier; Tianhao Tang. An Energy Management System of a Fuel Cell/Battery Hybrid Boat. Energies 2014, 7, 2799 -2820.

AMA Style

Jingang Han, Jean-Frederic Charpentier, Tianhao Tang. An Energy Management System of a Fuel Cell/Battery Hybrid Boat. Energies. 2014; 7 (5):2799-2820.

Chicago/Turabian Style

Jingang Han; Jean-Frederic Charpentier; Tianhao Tang. 2014. "An Energy Management System of a Fuel Cell/Battery Hybrid Boat." Energies 7, no. 5: 2799-2820.