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A State Variables Elimination-Based EMTP-Type Constant Admittance Equivalent Modeling Method for Power Electronic Converters
Mingwang Xu;Wei Gu;Yang Cao;Shuaixian Chen;Fei Zhang;Wei Liu
Currently, a multitude of power electronic devices are connected to the grid, and the safe and stable operation of the grid depends on the analysis of electromagnetic transient (EMT) simulation technology. This paper proposes a state variables elimination-based EMTP-type constant admittance equivalent modeling method for power electronic converters. The method employs a three-layer architecture co...Show More
Improving Accuracy of Interpolation Algorithm in EMT Simulation: A Padé Approximation and Switching Theorem Based Approach
Yang Cao;Wei Gu;Mingwang Xu;Fei Zhang;Shuaixian Chen;Wei Liu
As renewable sources and power electronic devices become more prevalent in the power system, the characteristics of power system are now shaped by power electronics, which presents new challenges for the acceleration algorithm used in electromagnetic transient (EMT) simulation. In this context, this paper refines five key technical points of interpolation algorithms and proposes an improved interp...Show More
NGnet-Based Sequential Optimization Technique of Variable Flux Memory Machines Considering Multimagnetization State Ripple Suppression
Since the existence of multiple magnetization states (MSs), variable flux memory machines (VFMMs) are difficult to optimize, especially their torque ripples under multiple states fail to be suppressed simultaneously. This article proposes a novel NGnet-based sequential (NGBS) optimization technique, which can significantly improve the optimization efficiency and topological freedom of the machine....Show More
Design and Optimization of a Novel Permanent Magnet Linear Motor With the Same Number of Poles and Slots
Jiutong Yang;Jinhua Chen;Ziyi Cai;Wenyuan Yan;Wei Liu;Jie Zhang;Jijun Qiao;Guilin Yang;Chi Zhang
Aiming at the problem of fixed pole-slot combinations of traditional permanent magnet linear motors (PMLMs), this paper proposes a novel PMLM with the same number of poles and slots, which is combined with several unit motors with different numbers of poles and slots. Firstly, the design principle of this type of motor is analyzed based on the slot electromotive force star diagram. The four possib...Show More
Magnetic Circuit Number Improvement of Novel Multiseries Magnetic Circuit Variable Flux Memory Machines With Reduced Magnetizing Current
Variable flux memory machines (VFMMs) have attracted wide interest in the field of electric vehicles due to their flexible flux variation (FV) capability. Nevertheless, the existing VFMMs still suffer from excessive remagnetizing or demagnetizing currents and limited FV range, which seriously hinder their potential for widening the speed range and high-efficiency region of VFMM. Addressing this is...Show More
Research on Torque Characteristics of the PMSM With the Same Number of Poles and Slots
Permanent magnet synchronous machines (PMSMs) with the same number of poles and slots have the advantages of high efficiency and high torque density. However, the asymmetric winding distribution introduces abundant magnetomotive force (MMF) harmonics, which cannot be neglected for torque ripple. Therefore, this article analyzes the torque characteristics of this type of machine by converting the e...Show More
Low-Dimensional Equivalent Models and Multithreading-Based Parallel EMT Simulation Method for Multi-Converter Systems
Mingwang Xu;Wei Gu;Yang Cao;Shuaixian Chen;Fei Zhang;Wei Liu
As the proportion of renewable energy generation in the grid increases, the number of voltage source converters (VSCs) has grown significantly. It is therefore of great importance to study the multi-VSC systems using electromagnetic transient (EMT) simulation. This paper presents a novel approach to modeling multi-VSC circuits, comprising EMT low-dimensional equivalent models and a multithreading-...Show More
A Novel Asymmetric Multi-Magnetic-Circuit Variable Flux Memory Machine With Magnetic-Field-Shifting Effect for Electric Vehicle Applications
Conventional variable flux memory machines (VFMMs) suffer from narrow flux adjustment (FA) range and low torque at the flux-weakened state, which significantly limit their merits in terms of overall efficiency improvement. Besides, excessive magnetization current requirements significantly restrict the application of such machines. To address this issue, this article proposes a novel asymmetric mu...Show More
A Hybrid Analytical Method for Yokeless and Segmented Armature Machine Considering Rotor Shifting and Eccentricity
Chi Zhang;Feng Yi;Shuheng Qiu;Jinhua Chen;Silu Chen;Wei Liu;Guilin Yang
This article proposes a hybrid analytical method (AM) to analyze rotor shifting and eccentricity in the yokeless and segmented armature (YASA) machine. The quasi-3-D subdomain (SD) method is utilized to calculate the magnetic field distribution accounting for the rotor shifting. The multilayer YASA machine is divided into five SDs considering the bilateral permanent magnet (PM) distribution and st...Show More
Neural Preassigned Performance Control for State-Constrained Nonlinear Systems Subject to Disturbances
Wei Liu;Jianhang Zhao;Huanyu Zhao;Qian Ma;Shengyuan Xu;Ju H. Park
This article addresses the finite-time neural predefined performance control (PPC) issue for state-constrained nonlinear systems (NSs) with exogenous disturbances. By integrating the predefined-time performance function (PTPF) and the conventional barrier Lyapunov function (BLF), a new set of time-varying BLFs is designed to constrain the error variables. This establishes conditions for satisfying...Show More
Distributed Coordinated Optimal Dispatch of Multiple Virtual Power Plants under Non-cooperative Game Theory
Xi Chen;Wei Liu;Xinran Xing;Yufei Wang;Xuechun Wang;Xintong Lu
2024 IEEE PES 16th Asia-Pacific Power and Energy Engineering Conference (APPEEC)
Year: 2024 | Conference Paper |
Aiming at the problem of multiple virtual power plants with many power regulation resources and high computational difficulty, as well as the power interaction and competition between different virtual power plants, this study proposes a distributed coordinated optimal dispatch strategy for multiple virtual power plants under non-cooperative game theory. The strategy considers the power fluctuatio...Show More
Fixed-admittance model and parameter optimization of multiple converters considering steady-state space and error correction
2024 8th International Conference on Electrical, Mechanical and Computer Engineering (ICEMCE)
Year: 2024 | Conference Paper |
The multi-converter is a common and critical equipment in modern power systems, and its dynamic response has a significant impact on the stability of simulation for new grid systems. However, the traditional modeling methods have the disadvantages of not considering the coupling branch and the large transient response error when dealing with the grid-connected simulation of multi-converter. To add...Show More
Disturbance Observer Based Fixed-Time HOSM Controller Design
2024 IEEE International Conference on Unmanned Systems (ICUS)
Year: 2024 | Conference Paper |
This paper investigates high-order sliding mode (HOSM) control for nonlinear systems affected by mismatched disturbances and output constraint. A new control strategy is introduced, incorporating a fixed-time disturbance observer (DO) and a fixed-time HOSM controller. Initially, the fixed-time DO is utilized to assess the mismatched disturbances. Subsequently, to address output constraint, the Bar...Show More
Coordinated Tracking Control of Fractional-Order Multi-Manipulator System Based on State Observer
2024 IEEE International Conference on Unmanned Systems (ICUS)
Year: 2024 | Conference Paper |
In this paper, the problem that it is difficult to measure the state components of the follower manipulator in the fractional-order multi-manipulator system is studied. A nonlin-ear state observer is designed to estimate the state components of the follower manipulator by using the system output. LMIs are used to solve the parameters of the observer and control al-gorithm. The sufficient condition...Show More
Dynamic partitioning and evaluation of autonomous regions based on stochastic model predictive control under chance constraints
2024 6th International Conference on Energy, Power and Grid (ICEPG)
Year: 2024 | Conference Paper |
In order to obtain a reliable autonomous region partitioning scheme while taking into account the uncertainty of distributed energy output, this paper proposes a stochastic model predictive control-based dynamic partitioning and evaluation method for autonomous regions under chance constraints. First, the autoregressive integrated moving average (ARIMA) model is applied to forecast wind and PV pow...Show More
Digital Twin Based Distributed Cooperative Frequency Control of Islanded Microgrids
2024 China International Conference on Electricity Distribution (CICED)
Year: 2024 | Conference Paper |
Due to the intricate operational mechanisms of various renewable energy sources within existing microgrid systems, fluctuations in output or load power and frequency instability are prone to occur, this study proposes a collaborative frequency control strategy based on digital twin strategy with depth deterministic strategy gradient (DDPG). Firstly, the utilization of the DDPG algorithm in microgr...Show More
Fault Location Method of Active Distribution Networks Based on Graph Attention V2 Network
2024 China International Conference on Electricity Distribution (CICED)
Year: 2024 | Conference Paper |
This paper develops a fault location method for active distribution networks fault location method based on the graph attention v2 network (GATV2). The GATV2 introduces the concept of dynamic attention and improves the performance of the model by adjusting the order of operation of the network layer of the graph attention network (GAT) to achieve the calculation of the dynamic attention value. The...Show More
Finite-Time Fuzzy Preassigned-Performance Control for Nonlinear Systems Subject to Asymmetric State-Constraints Based on Command Filter
This article presents a novel command-filter-based finite-time fuzzy preassigned performance adaptive control approach for nonlinear systems with exogenous disturbances and asymmetric time-varying constraints. Combining the asymmetric barrier Lyapunov function (ABLF) with preassigned performance control (PPC), it is ensured that the state x_{1} satisfies the required asymmetric time-varying st...Show More
Double-layer Game Optimization Strategy for Virtual Power Plants Considering Free Trading of Energy Storage Systems
Zhuangzhuang Li;Wei Liu;Junfang Zhang;Xinran Xing;Xi Chen;Yantao Li;Jinqi Lang;Fan Hua
2024 7th International Conference on Energy, Electrical and Power Engineering (CEEPE)
Year: 2024 | Conference Paper |
Cited by: Papers (1)
With the vigorous promotion of new energy and energy storage technology, virtual power plants (VPP), an important energy aggregation subject of smart grid construction and global energy interconnection, have broad development space. However, the traditional centralized control method makes it difficult to meet the scheduling requirements of multi-VPPs. Hence, we propose a double-layer game optimiz...Show More
Multiobjective Optimization of the PMSM With the Same Number of Poles and Slots Considering Dynamic Response and Torque Performance
Jiutong Yang;Jinhua Chen;Wei Liu;Shuheng Qiu;Guilin Yang;Chi Zhang
For several applications, such as robotic joints, it is necessary to simultaneously optimize the torque density, torque ripple, and dynamic response capability of permanent magnet synchronous machines (PMSMs). However, the method for evaluating the dynamic response capability based on the structural parameters of the machine and its co-optimization with the torque performance is not clear. Therefo...Show More
Command-Filter-Based Predefined-Time Control for State-Constrained Nonlinear Systems Subject to Preassigned Performance Metrics
This article tackles the predefined-time control problem for nonlinear systems subject to preassigned performance metrics (PPMs) and state constraints. To meet the PPMs and state constraints, the preassigned performance control-based barrier Lyapunov functions are designated to acquire the performance metrics and the satisfaction of state constraints. The proposed control approach combines the pre...Show More
An Improved Observer-Based Current Decoupling Method for Mitigating Speed Fluctuation of Variable Flux Memory Machines
Yuxiang Zhong;Heyun Lin;Jiyao Wang;Wei Liu;Hui Yang;Xiping Liu
Variable flux memory machines (VFMMs) usually need to inject d-axis current pulses in the stator windings to conduct magnetization state (MS) manipulations, which inevitably causes large torque pulsation and speed fluctuation especially under load condition. In this article, an improved observer-based current decoupling method is proposed to calculate the q-axis current (iq) reference for speed fl...Show More
Design Method of Hybrid Magnet Arrangement in Variable Flux Memory Machines Based on Elementary-Unit-Combined Concept
Wei Liu;Hui Yang;Heyun Lin;Chi Zhang;Jinhua Chen;Shuheng Qiu;Rong Li;Xindong Shu;Ya Li
Benefiting from the distinct capability enabling flexible flux regulation, variable flux memory machines (VFMMs) are considered as an excellent candidate for electric vehicles to achieve overall high efficiency. However, the structural connections and evolutionary laws between different VFMMs remain unrevealed, resulting in the lack of a comprehensive design method for VFMMs. This article investig...Show More
Q-axis Current Reverse Control of Variable Flux Memory Machines With High Salient Ratio During Magnetization Process for Speed Fluctuation Reduction
For variable flux memory machine (VFMM) with high salient ratio, a negative torque occurs when applying a positive d-axis current (id) pulse to magnetize the machine under positive q-axis current (iq), causing a large speed drop. Since traditional speed controllers tend to increase iq at this point to increase the speed, unfortunately the higher iq will generate stronger negative torque and furthe...Show More
A Multi-Period Analysis Method for Dispatch Potential of Electric Buses
2023 IEEE 7th Conference on Energy Internet and Energy System Integration (EI2)
Year: 2023 | Conference Paper |
In this study, we propose a multi-period analysis method for dispatch potential of electric buses in response to the shortage of dispatch resources on the generation side. The approach aims to explore the dispatch potential of electric buses as a demand-side load resource, alleviating the inadequacy of generation-side dispatch capacity resulting from the integration of a large amount of new energy...Show More
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