This paper presents a controller hardware-in-the-loop (CHIL) setup for a two-stage converter that integrates a Fuel Cell (FC) as a storage system within an isolated microgrid. The first stage employs a Three-Leg Inter...
详细信息
With the proliferation of power electronics, dc-based power distribution systems can be realized; however, dc electrical protection remains a significant barrier to mass implementation dc power distribution. Controlle...
详细信息
With the proliferation of power electronics, dc-based power distribution systems can be realized; however, dc electrical protection remains a significant barrier to mass implementation dc power distribution. controller hardware-in-the-loop (CHiL) simulation enables moving up technology readiness levels (TRL) quickly. This work presents an end-to-end solution for dc protection CHiL for early design exploration and verification for dc protection, allowing for the rapid development of dc protection schemes for both Line-to-Line (LL) and Line-to-Ground (LG) faults. The approach combines using Latency Based Linear Multistep Compound (LB-LMC), a real-time simulation method for power electronic, and National Instruments (NI) FPGA hardware to enable dc protection design with CHiL. A case study is performed for a 1.5 MW Voltage Source Rectifier (VSR) under LL and LG faults in an ungrounded system. The deficiency in real-time simulation resolution of Commercial-off-the-Shelf (COTS) for dc fault transients is shown, and addressed by using LB-LMC RT solver inside NI FPGA hardware to achieve 50 ns resolution of dc fault transients.
Grid-forming converters are attracting attention for their significant advantages in terms of stability in a weak grid and simulated inertia. However, while they offer great flexibility due to the use of power semicon...
详细信息
Grid-forming converters are attracting attention for their significant advantages in terms of stability in a weak grid and simulated inertia. However, while they offer great flexibility due to the use of power semiconductors, they are also affected by their low current-carrying capacity. This means that during a fault, instead of the usual voltage control, a current limiting control is active, which changes the dynamic performance of the converter and influences transient stability. This manuscript focuses on the dynamic performance of grid-forming converters during the restart phase at the post-fault period, and proposes an initial phase threshold to prevent the converter from going into current saturation. Based on this, the manuscript proposes several restart strategies during the post-fault period, by using some fast resynchronization methods in order to meet the requirements of the converter's stable operation and fast active power restoration. Finally, the above findings and the proposed strategies are validated by a joint control hardware-in-the-loop system.
Energy Management for microgrids with various compositions and sizes is challenging for conventional optimization-based approach which requires complex problem formulation and high computing power. A microgrid control...
详细信息
Energy Management for microgrids with various compositions and sizes is challenging for conventional optimization-based approach which requires complex problem formulation and high computing power. A microgrid controller with general rule-based dispatch adaptive to different microgrid compositions and operating modes is presented in this article. Several basic dispatch rules are designed with objectives of balancing the total power, tracking grid power import/export reference, mitigating renewable generation fluctuation and reducing energy storage losses. Mathematical formulation and graphical solutions for rules design are described. The basic rules are then combined to form generalized dispatch strategies capable of operating in different scenarios. Four types of dispatch strategies and their variants in terms of dispatchable generator control are introduced. Recommendation of the dispatch types for different microgrid configurations and the adaptivity to microgrid composition variation are also given. The microgrid controller is validated with comprehensive testing and comparative study under various operating points and modes on a controller hardware-in-the-loop (CHIL) testbed.
The use of distributed control systems for microgrid control has gained traction in recent years for their reliability and modularity. As part of microgrid control core functions, islanding is implemented to enhance p...
详细信息
The use of distributed control systems for microgrid control has gained traction in recent years for their reliability and modularity. As part of microgrid control core functions, islanding is implemented to enhance power supply reliability during outages. This paper proposes a distributed multi-agent control system architecture for the management of microgrid assets. Specifically, it addresses the islanding problem, whereas three agent categories are designed to control distributed energy resources, loads and other assets. The proposed control approach is unique as it centrally sources critical commands while keeping the commands execution local and based on distributed coordination. Post-islanding transients are minimized and system stability is retained by implementing two distributed load shedding and load curtailment algorithms for unplanned and planned islanding events, respectively. A controllerhardware-in-the loop real-time simulation on a modified CIGRE North American medium voltage distribution benchmark has been developed and used to demonstrate the effectiveness of the approach.
暂无评论