A5088076549- Microgrid Control and Optimization
- Smart Grid Energy Management
- Frequency Control in Power Systems
- Real-time simulation and control systems
- Smart Grid Security and Resilience
- Power System Optimization and Stability
- Optimal Power Flow Distribution
- Control Systems and Identification
- HVDC Systems and Fault Protection
- Islanding Detection in Power Systems
- Power Systems and Renewable Energy
- Machine Fault Diagnosis Techniques
- Advanced Battery Technologies Research
- Photovoltaic System Optimization Techniques
- Nuclear reactor physics and engineering
- Molten salt chemistry and electrochemical processes
- Network Security and Intrusion Detection
- Wind Turbine Control Systems
National Renewable Energy Laboratory
2023-2024
Idaho National Laboratory
2022-2023
Lehigh University
2017-2022
Aalborg University
2021
In dc microgrids, load power sharing and bus voltage regulation are two common control objectives. this article, a consensus-based algorithm is presented to achieve proportional of weighted geometric mean voltages in microgrids with ZIP (constant impedance, constant current, power) loads simultaneously. By using the virtue Laplacian matrices undirected connected graphs, lemma derived assist stability analysis microgrids. Thus, sufficient condition that stabilizes system established....
In modern control systems, most algorithms, especially system-level ones, are implemented in discretetime (DT) with digital controllers and communications. this paper, a distributed DT algorithm is developed to achieve proportional load current sharing average bus voltage regulation DC microgrids. order reduce the communication requirement among controllers, periodic event-triggered (PET) proposed by introducing novel PET condition. Since condition detected periodically, Zeno phenomenon...
In conventional DC microgrid control schemes, optimization and real-time are usually performed at different time scales. It is hard for such schemes to achieve optimization. Even a small disturbance can result in deviations of bus voltages output currents from their optimal operating points. addition, most controllers cannot guarantee the satisfaction pre-defined constraints on individual due disconnection between steady-state control. this paper, distributed scheme presented microgrid. The...
A dc microgrid needs to be well controlled fully unlock its potential. This article presents a distributed event-triggered control algorithm for accurate load current sharing and voltage profile regulation of microgrid. According the design, subsystem controller only communicates with neighboring controller(s) when certain condition evaluated using local measurements is triggered. Thereafter, signals are updated such events triggered locally or at subsystem(s). Since can significantly lower...
A single-bus DC microgrid can represent a wide range of applications. Control objectives such systems include high-performance bus voltage regulation and proper load sharing among multiple distributed generators (DGs) under various operating conditions. This paper presents novel decentralized control algorithm that guarantee both the transient performance realize predefined percentages. First, output-constrained problem is transformed into an equivalent unconstrained one. Second, two-step...
DC microgrids are growing in popularity due to their advantages terms of simplicity and energy efficiency while connecting dc sources loads. In traditional hierarchical schemes, optimization control implemented at different time scales. The loose integration lowers its makes it hard achieve real-time optimization. Even a slight disturbance can result deviations bus voltages output currents from optimal operating points. Additionally, most schemes cannot guarantee the boundedness individual...
A microgrid is hard to control due its reduced inertia and increased uncertainties. To overcome the challenges of control, advanced controllers need be developed. In this paper, a distributed, two-level, communication-economic scheme presented for multiple-bus microgrids with each bus having multiple distributed generators (DGs) connected in parallel. The objective upper level calculate voltage references one-bus subsystems. objectives lower are make subsystems' voltages track enhance load...
This article presents a distributed periodic event-triggered (PET) optimal control scheme to achieve generation cost minimization and average bus voltage regulation in DC microgrids. In order accommodate the constraints of generators (DGs), virtual incremental is firstly designed, based on which an optimality condition derived facilitate design. To meet discrete-time (DT) nature modern systems, controller directly developed DT domain. Afterward, reduce communication requirement among...
In this paper, a novel discrete-time self-triggered (DTST) distributed controller is developed for DC microgrids with data dropouts and communication delays. To meet the (DT) nature of digital systems, DT first proposed to achieve load current sharing average voltage regulation simultaneously in microgrids. further relax restrictions, mechanism integrated along controller, where local proactively estimates next instant ahead time. Since can only be triggered at instants, Zeno phenomenon...
Steady-state optimization and real-time controls are conventionally achieved by separate controllers acting at different timescales in dc microgrids. The separation between them not only lowers the overall energy efficiency but also can cause line currents output of distributed generators (DGs) to exceed their limits. Targeting these issues, an optimal controller for microgrids is proposed this article simultaneously achieve minimization operating losses (converter losses) regulation DG...
In a multibus dc microgrid, both the constant power loads (CPLs) and discrete-time (DT) sampling of digital controllers tend to destabilize system. To address these issues, novel distributed DT control scheme is presented in this article achieve proportional load current sharing weighted average bus voltage regulation microgrids with impedance loads, CPLs (ZIP loads). First, microgrid model ZIP established domain, based on which controller developed. A sparse communication network then...
Pulsed power loads (PPLs) consume a huge amount of energy within short time. An storage system (ESS) is usually installed in shipboard (SPS) for PPL accommodation. Online accommodation strategies, where the connected to SPS through ESS all time, have great advantages reducing hardware cost and increasing deployment frequency. But there lack online solutions deal with operational requirements. This article presents barrier-Lyapunov-function-based optimal control solution dc SPSs. By...
This article presents a distributed consensus-based controller for dc microgrids to achieve proportional current sharing and weighted average voltage regulation in the presence of ZIP [constant impedance (Z), constant (I), power (P)] loads. The proposed algorithm allows global manner. precondition on initial bus voltages is relaxed. Furthermore, this study investigates negative conductance introduced by Based properties Laplacian matrices, positive definiteness requirement matrix A...
Abstract Traditionally, nuclear power plants in the U.S. provide baseload to grid because they have less flexibility for ramping their output than natural gas peaking plants. However, achieving climate goals reduce consumption of fossil‐based places pressure on and other generators ramp up balance generation with demand. This paper presents modelling performance analysis a reactor system (NRS) coupled liquid‐metal battery (LMB) improve its dynamic response enable black start capability. The...
With the increasing integration of inverter-based resources into power grid, there has been a notable reduction in system inertia, potentially compromising frequency stability. To assess suitability existing area inertia estimation techniques for real-world systems, this paper presents rigorous comparative analysis identification, measurement reconstruction, and electromechanical oscillation-based methodologies, specifically applied to large-scale multi-area WECC 240-bus system....
The emergence of grid-forming (GFM) inverter technology and the increasing role machine learning in power systems highlight need for evaluating latest dynamic simulators. Open-source simulators offer distinct advantages this field, being both free highly customizable, which makes them well-suited scientific research validation models methods. This paper provides a comprehensive survey comparison open-source that support GFM, with focus on their capabilities performance machine-learning applications.
As renewable energy penetration increases and the traditional generators retire in power grids, system inertia decreases exhibits significant daily fluctuations. Furthermore, fast frequency responses (FFRs) provided by inverter-based resources (IBRs) begin to playa very critical role bring new challenges real-time monitoring due difficulties of quantifying its artificial contribution. Thus, necessitating an accurate estimation tool will not only benefit secure grid operations, but also...
Abstract For pulsed power load (PPL) accommodation in a medium‐voltage DC (MVDC) shipboard system (SPS), the charging control of energy storage systems (ESSs) and generation distributed generators (DGs) need to be properly coordinated. Targeting important but not well‐studied problem, an optimal output‐constrained algorithm for offline PPL strategy is presented. Three objectives including realising references, maintaining bus supercapacitor voltages within safe operating ranges, minimising...
The power system is a crucial infrastructure which supports computer systems that affect many aspects of our daily lives, and thus constant target hackers' malicious attacks. An unidentifiable attack new type bad data injection on confuses the control center software by manipulating measurement so there exist multiple feasible solutions for state estimation no deterministic solution can be produced. To reveal defend against this attacks, these must solved in advance. This paper proposes fast...