Fuzzy Control of Supercapacitor Current in Hybrid Diesel Generator/Fuel Cell Marine Power System

2015 ◽  
Vol 12 (2) ◽  
Author(s):  
Amin Hajizadeh ◽  
Amir Hossein Shahirinia ◽  
David C. Yu
Keyword(s):  
Fuel Cell ◽  
Fuzzy Control ◽  
Power System ◽  
Control Strategy ◽  
Current Control ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Diesel Generator ◽  
Storage Unit ◽  
Power Sources

This paper presents a power control strategy for a marine power system made up of a hybrid diesel generator, a fuel cell, and an energy storage unit. For this purpose, a self-tuning fuzzy control is designed to manage the power generation between power sources during different maneuverings and voltage disturbances (both balanced and unbalanced) in an AC system. As a solution, a current control strategy using a voltage source converter is presented. Simulation results show the response of the whole system under a test driving cycle and this variety of voltage disturbance conditions. They illustrate the performance, including power flow control and voltage disturbance ride-through capability, of the proposed control strategy.

Incorporation of a Redox Flow Battery in a Wind-Diesel Power System for Simultaneous Frequency and Voltage Control

2008 ◽  
Vol 32 (2) ◽  
pp. 179-195 ◽  
Author(s):  
Shameem Ahmad Lone ◽  
Mairajud-Din Mufti ◽  
Shiekh Javed Iqbal
Keyword(s):  
Power System ◽  
Reactive Power ◽  
Current Control ◽  
Voltage Source ◽  
Frequency Regulation ◽  
Voltage Source Converter ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Energy Storage Devices ◽  
Battery System

Energy storage devices are required for power quality maintenance in stand alone power systems like wind-diesel ones. A redox flow battery system has many virtues which make its integration with a wind-diesel power system attractive. This paper proposes the integration of a redox flow battery system with a typical multi-machine wind-diesel power system for simultaneous voltage and frequency regulation. The redox flow battery is connected to wind park bus through a current controlled voltage source converter based on hysterisis current control. Keeping in view the non-linear and time varying nature of the hybrid wind-diesel-redox flow battery system, neuro-adaptive control is proposed for active/reactive power modulation of the redox flow battery.

scholarly journals An Interaction Less Duo Control Strategy for Bi-polar Voltage Source Converter in Renewables Integrated Multi-Terminal HVDC (MTDC) Grids

2022 ◽  
Author(s):  
Satish Kumar Ancha
Keyword(s):  
Power System ◽  
New England ◽  
Case Studies ◽  
Control Strategy ◽  
Control Technique ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Droop Control ◽  
Dc Voltage ◽  
Test Systems

The PVF or PV<sup>2</sup>F<sup> </sup>double droop control is commended for its ability to regulate both the dc voltage and frequency in a decentralized approach. However, a convincing response is not achieved due to an interaction between the droop characteristics of dc voltage and frequency. This interaction affects the dc voltage and frequency support of the AC system surrounded Multi-Terminal HVDC (AC-MTDC) grid. To overcome this effect, a Duo control strategy is proposed in this paper, which takes advantage of a Bi-polar Voltage Source Converter (B-VSC) topology in the MTDC grid. The virtue of proposed control technique is emphasized by comparing it with the existing $ PV<sup>2</sup>F double droop control along with three case studies and two test systems. The validation of interaction less Duo control strategy is carried out on five terminal CIGRE DC grid benchmark model integrated into two area power system (AC-MTDC grid-1) and New England IEEE 39 bus system (AC-MTDC grid-2). These test systems are simulated in PSCAD/EMTDC software.

Stabilization of Power System Including Wind Farm by PWM Voltage Source Converter and Chopper Controlled SMES

2012 ◽  
Author(s):  
Md. Shamim Anower ◽  
Md. Rafiqul Islam Sheikh
Keyword(s):  
Energy Storage ◽  
Power System ◽  
Control Strategy ◽  
Wind Farm ◽  
Magnetic Energy ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Superconducting Magnetic Energy Storage ◽  
Terminal Voltage ◽  
Magnetic Energy Storage

This paper presents a dynamic model of Superconducting Magnetic Energy Storage (SMES) device developed, which can significantly decrease the voltage and power fluctuations of grid connected fixed speed wind generators. The SMES system with a voltage–source IGBT converter and two–quadrant DC–DC chopper is analyzed as a controllable energy source. The objective of the proposed SMES control strategy is to smooth the wind farm output by absorbing or providing real power. Moreover, its reactive power output can also be controlled to keep the wind farm terminal voltage constant. The control methodology of SMES system is suitable for the two objectives stated above. The performance of the proposed system is evaluated by dynamic simulations using a test power system. Real wind speed data is used in the simulation analyses, which validates the effectiveness of the proposed control strategy. Simulation results clearly show that the proposed control strategy can smooth well the wind generator output power and also maintain the terminal voltage at rated level. Key words: Minimization of fluctuations; superconducting magnetic energy storage (SMES); wind generator stabilization; voltage source converter (VSC); DC–DC chopper

scholarly journals Improved Operation Strategy with Alternative Control Targets for Voltage Source Converter under Harmonically Distorted Grid Considering Inter-Harmonics

Energies ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1236 ◽  
Author(s):  
Bo Pang ◽  
Heng Nian
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Control Object ◽  
Current Control ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Pass Filter ◽  
Control Gain ◽  
Distorted Grid ◽  
The Stability

This paper proposed an improved control method for grid-connected voltage source converter (VSC), when the grid voltage consisted of the integer harmonics and inter-harmonics. Control object of the proposed control can be alternated to achieve the sinusoidal current or smooth output power, which enhances the operation adaption of VSC under the harmonically distorted grid. On the basis of a PI regulator in the fundamental current control loop, the novel control strategy was proposed with a supplementary controller which consisted of a prepositive high-pass filter and a modified proportional-derivative controller. In the proposed control, the inter-harmonics could be suppressed without detecting frequency, while the traditional resonator was effective in the premise of knowing the harmonics frequency. Also, the influence of control gain on the steady performance and the stability of VSC was analyzed, and the influences on the fundamental control caused by the proposed controller were also analyzed to verify the practicability of the proposed control strategy. Finally, the effectiveness of the proposed strategy was verified by the experiments.

scholarly journals Design of Res Based Pv-Wind Generation System for Microgrid System

2019 ◽  
Vol 9 (2) ◽  
pp. 4567-4571
Keyword(s):  
Storage System ◽  
Energy Storage System ◽  
Voltage Source ◽  
Small Scale ◽  
Voltage Source Converter ◽  
Diesel Generator ◽  
Power Sources ◽  
Renewable Power ◽  
Battery Energy ◽  
Wind Generation System

Power expansions of network to disconnected areas are related with specialized and affordable issues. To examine the power Renewable Power Sources (RES) are used. In this paper, the design of RES based PV based wind generator is proposed. Here voltage source converter is used in the autonomous small scale applications. The both battery energy storage system and the diesel generator will produce the operation as fast as possible compared to other blocks. The main advantage of this system is control the system without any interpretations. AC source is obtained because of the proposed Distributed Generation set acts as an AC source. By utilizing fluffy rationale controller in this framework, to decrease the deviations in the waveforms. A wide assortment of matlab/simulink reproduction results is introduced to exhibit every one of the highlights of the proposed framework.

scholarly journals Fuel Cell Application for Investigating the Quality of Electricity from Ship Hybrid Power Sources

2019 ◽  
Vol 7 (8) ◽  
pp. 241 ◽  
Author(s):  
Hyeonmin Jeon ◽  
Seongwan Kim ◽  
Kyoungkuk Yoon
Keyword(s):  
Fuel Cell ◽  
Power System ◽  
Power Quality ◽  
Molten Carbonate Fuel Cell ◽  
Molten Carbonate ◽  
Test Bed ◽  
Diesel Generator ◽  
Combined System ◽  
Power Sources

Since recent marine application of fuel cell systems has been due largely limited to small-sized ships, this paper was aimed to investigate the technical applicability of molten carbonate fuel cell (MCFC) for medium and large-sized ships, using a 180 kW class hybrid test bed with combined power sources: A 100 kW MCFC, a 30 kW battery and a 50 kW diesel generator. This study focused primarily on determining whether the combined system designed in consideration of actual marine power system configuration could function properly. A case study was conducted with a 5500 Twenty-foot Equivalent Unit (TEU) container vessel. The operation profile was collected and analyzed in order to develop electric load scenarios applicable to the power system. Throughout the experiment, we evaluated the power quality of the voltage and frequency in the process of synchronization and de-synchronization across the power sources. Therefore, research results revealed that power quality continued to be excellent. This outcome provides insight into the technical reliability of MCFC application on large marine vessels.

scholarly journals An Interaction Less Duo Control Strategy for Bi-polar Voltage Source Converter in Renewables Integrated Multi-Terminal HVDC (MTDC) Grids

2022 ◽  
Author(s):  
Satish Kumar Ancha
Keyword(s):  
Power System ◽  
New England ◽  
Case Studies ◽  
Control Strategy ◽  
Control Technique ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Droop Control ◽  
Dc Voltage ◽  
Test Systems

The PVF or PV<sup>2</sup>F<sup> </sup>double droop control is commended for its ability to regulate both the dc voltage and frequency in a decentralized approach. However, a convincing response is not achieved due to an interaction between the droop characteristics of dc voltage and frequency. This interaction affects the dc voltage and frequency support of the AC system surrounded Multi-Terminal HVDC (AC-MTDC) grid. To overcome this effect, a Duo control strategy is proposed in this paper, which takes advantage of a Bi-polar Voltage Source Converter (B-VSC) topology in the MTDC grid. The virtue of proposed control technique is emphasized by comparing it with the existing $ PV<sup>2</sup>F double droop control along with three case studies and two test systems. The validation of interaction less Duo control strategy is carried out on five terminal CIGRE DC grid benchmark model integrated into two area power system (AC-MTDC grid-1) and New England IEEE 39 bus system (AC-MTDC grid-2). These test systems are simulated in PSCAD/EMTDC software.

Inductor Saturation Compensation in Three-Phase Three-Wire Voltage-Source Converters via Inverse System Dynamics-I

2020 ◽  
Author(s):  
Ziya Özkan ◽  
Ahmet Masum Hava
Keyword(s):  
Dynamic Model ◽  
Dynamic Performance ◽  
Current Control ◽  
Inverse System ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Two Phase ◽  
Inverse Dynamic ◽  
Three Phase ◽  
Steady State Current

In three-phase three-wire (3P3W) voltage-source converter (VSC) systems, utilization of filter inductors with deep saturation characteristics is often advantageous due to the improved size, cost, and efficiency. However, with the use of conventional synchronous frame current control (CSCC) methods, the inductor saturation results in significant dynamic performance loss and poor steady-state current waveform quality. This paper proposes an inverse dynamic model based compensation (IDMBC) method to overcome these performance issues. Accordingly, a review of inductor saturation and core materials is performed, and the motivation on the use of saturable inductors is clarified. Then, two-phase exact modelling of the 3P3W VSC control system is obtained and the drawbacks of CSCC have been demonstrated analytically. Based on the exact modelling, the inverse system dynamic model of the nonlinear system is obtained and employed such that the nonlinear plant is converted to a fictitious linear inductor system for linear current regulators to perform satisfactorily.

Real power regulation design for multi-terminal VSC-HVDC systems

2013 ◽  
Vol 3 (2) ◽  
Author(s):  
Guo-Jie Li ◽  
Si-Ye Ruan ◽  
Tek Lie
Keyword(s):  
Control Strategy ◽  
Control Mode ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Real Power ◽  
The Real ◽  
Hvdc System ◽  
High Voltage Direct Current ◽  
Power Regulation ◽  
Regulation Functions

AbstractA multi-terminal voltage-source-converter (VSC) based high voltage direct current (HVDC) system is concerned for its flexibility and reliability. In this study, a control strategy for multiple VSCs is proposed to auto-share the real power variation without changing control mode, which is based on “dc voltage droop” power regulation functions. With the proposed power regulation design, the multiple VSCs automatically share the real power change and the VSC-HVDC system is stable even under loss of any one converter while there is no overloading for any individual converter. Simulation results show that it is effective to balance real power for power disturbance and thus improves operation reliability for the multi-terminal VSC-HVDC system by the proposed control strategy.

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