In an ac/dc hybrid distribution grid (ac/dc HDG), different ac grids are connected through a voltage source converter (VSC)-based dc to operate the entire system in secure and economic manner. This paper presents decentralized optimal operation approach for running HDG which can either work individually or collaborate with each other. Using analytical target cascading approach, three-level hierarchy consisting of grids, VSC stations is formulated decompose problem HDG. The obtained...

Photovoltaic (PV) generation is increasingly popular in power systems. The nonlinear dependence associated with a large number of distributed PV sources adds the complexity to construct an accurate probability model and negatively affects confidence levels reliability, thereby resulting more challenging operation Most models have many restrictions when constructing multiple complex dependence. This paper proposes versatile on basis pair copula construction. In order tackle computational...

As a clean energy, wind power has been extensively exploited in the past few years. However, oscillations turbines, particularly those from controllers, could severely affect stability of systems. Therefore, oscillation suppression is recent research focus. Based on small-signal model eigenvalues and participation factors, this paper detects sub-synchronous interactions (SSI) mainly determined by converters' PI parameters grid-connected doubly fed induction generator (DFIG). With aim...

This paper proposes a novel decentralized control strategy for multiparallel grid-forming distributed generations (DGs) in an islanded microgrid. Different from most existing droop-based hierarchical methods, the proposed scheme imposes fixed system frequency that is independent of load conditions. Additionally, proper point common coupling (PCC) voltage amplitude maintaining and proportional power sharing can be simultaneously achieved when dealing with variations DGs plug in/off. The...

A new internal STATCOM control based on feedback linearization is proposed. The controller developed without any simplifying assumptions to the model. proposed validated IEEE 118-bus system with full-order generator and network models as opposed a small test system. Furthermore, benchmarked against published results. Lastly controllability issues associated singularity in (FBLC) coordinate transformation identified, solution provided avoid instability.

This paper summarizes numerical methods for Stochastic Differential Algebraic Equations (SDAEs) with which power system are modeled. The loads modeled as random variables appear in algebraic equations. properties of (DAE) and (SDE) reviewed the first-order backward euler method is proposed SDAE transient stability simulation. Illustration examples given on a single-machine-infinite-bus (SMIB) system.

This paper presents an analysis of the evolution probability density function dynamic trajectories a single machine infinite bus power system. The can be used to determine impact random (stochastic) load perturbations on system stability. state over time leads several interesting observations regarding stability regions as damping parameter. Fokker-Planck equation (FPE) is describe states. FPE solved numerically using PDE solvers (such finite difference method). Based results, qualitative...

Power converters in the system-level real-time simulation are usually emulated by L/C-based associated discrete circuit (L/C-ADC). However, L/C-ADC approaches may suffer from two issues: How to mitigate unacceptable virtual power loss especially high-frequency applications, and how tune LC parameters setting which is affected external circuit. This paper proposes a novel generalized (G-ADC) model with parameterized history current sources. By utilizing stability region of feasible parameter...

The switching frequency of power electronic devices has become much higher than before, which brings great challenges to real-time simulators. small time step in high simulations remarkably increases the difficulty satisfy requirement. This article realizes accurate simulation a solid-state transformer (SST) with 50 kHz at 250 ns on field-programmable gate array (FPGA)-based platform. hybrid companion circuit modeling method and compact-electromagnetic transient program (EMTP) algorithm are...

Multi-energy generation grids (MEGGs) provide a promising solution for reliable operations of cooperative various distributed energy resources (DERs), supply environmentally friendly to remote/off-grid areas, and improve overall system performance in terms efficiency, reliability, flexibility, resiliency. However, with the penetration presence DERs unpredictable renewables-based power intermittent loads, operational coordination supervision tasks become more complex. The communication-based...

Probabilistic load flow (PLF) is a powerful and widely used tool to address the random nature of renewable energy resources for planning operation power systems. In this study, new approach using combination multiple integral method (MIM) cumulant (CM) proposed PLF studies. The problem with high dimensionality decomposed into bi-level solved by MIM CM reduce computational burden significantly while achieving satisfactory accuracy. applied IEEE 118-bus system compared point estimate method....

In this paper, a Lyapunov function-based decentralized control scheme is proposed for single-phase parallel-connected inverters system within islanded micro-grid. With novel method, proper voltage regulation (e.g., amplitude and waveform quality) excellent power current sharing performance can be well ensured even in the presence of unknown line impedance unbalanced LC filter parameters. addition, high reliability robustness guaranteed since no inter-communication among as centralized...

This paper presents the design of a filtered tracking error based robust current controller for three-phase grid-tied inverters interfacing distributed renewable resources into grid. An uncertainty and disturbance modeling control law is developed achieving robustness against non-ideal grid conditions, including impedance variations, voltage harmonics, fluctuations in magnitude (symmetrical/asymmetrical), frequency, phase. The proposed shown to have superior performance directly injected...

The real-time simulation based on the field programmable gate array (FPGA) is receiving more and attention. However, up to now, scale for power electronic system not so satisfactory due requirement FPGA resource limitation. This paper proposes a sub-microsecond level method microgrids. converters are modeled with fixed-admittance models simulated compact electromagnetic transients program (EMTP) algorithm. In meanwhile, distribution lines/cables π-circuit distributed circuit solution method,...

Abstract Globally abundant wave energy for power generation attracts ever increasing attention. Because of non-linear dynamics and potential uncertainties in ocean conversion systems, productivity needs to be increased by applying robust control algorithms. This paper focuses on strategies a small system based direct driven permanent magnet synchronous generator (PMSG). It evaluates the performance two kinds strategies, i.e., traditional field-oriented (FOC) adaptive control. The proposed...

Renewable energy resources (RESs) have been considered to be a promising solution for providing clear and economical power in isolated islands. Due the low predictive nature, conventional unit commitment with deterministic optimization algorithm is no long suitable grids high RES scale. This paper proposes coordinated multi-time scale robust scheduling framework system storage units. The decomposes adjustable dispatch process into three stages specifies operational policy of thermal...

Abstract The aggregation models of renewable energy power stations are difficult to apply the stability research fault inside station or oscillation analysis between and grid‐side system, high dimensional characteristics their detailed model will pose an enormous challenge simulation efficiency. To alleviate contradiction accuracy efficiency, this paper proposes a state‐variable‐preserving method efficiently inverter‐based resources node tearing realize parallel consisting resources. uses...

Parallel operation of inverter modules is the solution to increase reliability, efficiency, and redundancy inverters in microgrids. Load sharing among distributed generators (DGs) a key issue. This study investigates feasibility power-sharing parallel DGs using dual control strategy islanded mode microgrid. PQ droop techniques are established microgrid operation. P-f Q-E used attain real reactive power sharing. The frequency variation caused by load change an issue whereas tracking error...

As wind energy is increasingly exploited worldwide, optimisation of farm layout becomes more crucial. To guarantee the economic efficiency and profit a farm, deployment turbines has to be optimised before operation. Traditional methods usually assume that identical type are utilised in design. In this study, multiple types considered complex terrain, namely mixed‐installation. By utilising different power generation characteristics, hub heights rotor diameters, cost models turbines, can...

To effectively capture interactions of large-scale ac-dc systems integrating line commutated converter (LCC) and modular multilevel (MMC) based multiterminal dc grids, a numerically accurate efficient simulation method is desirable. achieve this objective, cosimulation proposed in article, where the target system decoupled into shifted-frequency phasor (SFP) subsystem, dynamic (DP) electromagnetic transient (EMT) respectively. The MMCs are included SFP subsystem implemented on massively...