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Fault-Current Limiting Strategy for Grid-Forming Converters With Virtual Impedance From Both Inner CCL and Outer VCL
2023 IEEE 7th Conference on Energy Internet and Energy System Integration (EI2)
Year: 2023 | Conference Paper |
With the improvement of the control strategies of grid-forming converters (GFMCs), the quantity and dimensions of semiconductor components continue to increase, resulting in GFMCs unable to withstand large currents during grid faults like traditional synchronous generators (SGs). Therefore, the fault current limitation of GFMCs during grid faults has become a research priority. This paper proposes...Show More
A Stable Speed Recovery Strategy for DFIG Considering Secondary Frequency Drop
2023 IEEE 7th Conference on Energy Internet and Energy System Integration (EI2)
Year: 2023 | Conference Paper |
Double-fed induction generator (DFIG) can participate in grid frequency regulation by releasing kinetic energy stored in rotating mass and utilizing virtual inertial control (VIC). However, during the recovery phase of rotor speed, there may be a decrease in the secondary frequency of the power grid, which will further worsen the system imbalance. In order to tackle this problem, this paper propos...Show More
The Optimal Ratio of GFM-Converters to GFL-Converters for Transient Voltage Regulation with Weak Grid Condition
2023 IEEE 7th Conference on Energy Internet and Energy System Integration (EI2)
Year: 2023 | Conference Paper |
Cited by: Papers (1)
High proportion of renewable energy connected to the grid has facilitated integration of grid-forming (GFM) and grid-following (GFL) converters in the power system. However, the large-scale integration of converters and renewable energy has greatly changed the operational characteristics of the traditional grid, especially transient voltage characteristics. The grid with proper ratio of GFM-conver...Show More
Harmonic Stability Analysis and Harmonic Suppression Strategy for Grid-Forming Converter with Dual-Loop Control
2023 4th International Conference on Advanced Electrical and Energy Systems (AEES)
Year: 2023 | Conference Paper |
With the increasing proportion of renewable energy in the power grid, the stability of the power system is facing challenges. Compared to grid-following converters, grid-forming (GFM) converters have voltage source characteristics, which can improve the support capability of power electronic equipment and enhance the security level of the power grid. When grid-forming converter adopts vector volta...Show More
Voltage Support Capability Improvement for Grid-connected Converters under LVRT Conditions Considering Grid Impedance Variation
2023 4th International Conference on Advanced Electrical and Energy Systems (AEES)
Year: 2023 | Conference Paper |
With the increasing employment of grid-connected converters (GCCs), the potential voltage support capability of the GCCs is expected to be fully utilized during the low voltage ride through (LVRT) condition. This study proposes a power reference adjustment strategy which improves the voltage support capability of the GCC. To be specific, a security-region-based analysis procedure is first introduc...Show More
Adaptive Control Strategy for Grid-Forming Inverter during Low-voltage Ride-through
2023 4th International Conference on Advanced Electrical and Energy Systems (AEES)
Year: 2023 | Conference Paper |
Cited by: Papers (1)
With the increasing penetration of new energy power stations connected to the grid, it is required that new energy power stations could not operate without the power grid during voltage dips. The requirement could cause overcurrent in the inverters, which would damage the inverters. In order to solve the problem, an adaptive control strategy during low-voltage ride-through(LVRT) is proposed to red...Show More
Improved Frequency Response Model for Power System with Photovoltaic Generation
2022 IEEE 5th International Electrical and Energy Conference (CIEEC)
Year: 2022 | Conference Paper |
With the gradual increase of renewable generation integration, power system with high-penetration photovoltaic(PV) integrated is one of the typical operating scenarios. Large-scale PV entry affects the dynamic frequency characteristics of the power system greatly. Based on the analysis of the insufficiency of the traditional power system frequency response (SFR) model, an improved SFR model of the...Show More
A Generic Small-Signal Stability Criterion of DC Distribution Power System: Bus Node Impedance Criterion (BNIC)
Bangbang He;Wu Chen;Xinbo Ruan;Xin Zhang;Zhixiang Zou;Wu Cao
The dc distribution power system has drawn widespread attention and rapidly developed in recent years; however, its stability issue is one of the urgent challenges, requiring much attention. In previous stability studies, the line impedance network is often overlooked, which is convenient for the geographically centralized systems, but inaccurate for the distributed systems. In this article, the m...Show More
An AC Fault Ride Through Method for MMC-HVDC System in Offshore Applications Including DC Current-Limiting Inductors
Haihan Ye;Wu Cao;Wu Chen;Heng Wu;Guoqing He;Guanghui Li;Yanna Xi;Qingshi Liu
The current-limiting inductors (CLIs) are commonly used to suppress DC fault current to safely trip DC circuit breakers in MMC-HVDC systems, but it significantly jeopardizes DC dynamics and causes instantaneous power mismatch between AC and DC sides of islanded rectifier station (RS), exposing MMC internal states to large disturbance. This paper firstly provides a detailed analysis of the influenc...Show More
Harmonic Stability Criterion for Modular Multilevel Converter based AC System Connected with multi-paralleled Inverters
2021 IEEE Sustainable Power and Energy Conference (iSPEC)
Year: 2021 | Conference Paper |
The system of multi-parallel inverters connected with modular multilevel converter is the very suitable for the transmission and utilization of the renewable energy. The harmonic stability is the foundation for the operation of the modular multilevel converter based AC system connected with multi-paralleled inverters. In this paper the harmonic stability criterion for the modular multilevel conver...Show More
Maximum Capacity Assessment for Multi-paralleled Grid-connected Inverters using Global-Admittance based Harmonic Stability Analysis
2021 IEEE Sustainable Power and Energy Conference (iSPEC)
Year: 2021 | Conference Paper |
Cited by: Papers (2)
With the increasing demand for the renewable energy, the stability of the multi-paralleled grid-connected inverters is the important factor for evaluation the capacity of the inverters connected to power grid. In this paper the maximum capacity assessment for multi-paralleled grid-connected inverters using global-admittance based harmonic stability analysis is proposed. The stability analysis meth...Show More
An AC Fault Ride Through Method for MMC-HVDC Connecting to Renewable Plants Including Large DC Inductors
2021 IEEE Sustainable Power and Energy Conference (iSPEC)
Year: 2021 | Conference Paper |
Cited by: Papers (1)
The current-limiting inductors (CLIs) are commonly used to suppress DC fault current to safely trip DC circuit breakers in MMC-HVDC systems, but it significantly jeopardizes DC dynamics and causes instantaneous power mismatch between AC and DC sides of islanded rectifier station (RS), exposing MMC internal states to large disturbance. This paper provides a detailed analysis of the influence of CLI...Show More
Fast Tracking Phase-Locked Loop Based on Complex Vector Form and Phase Difference Interval Judgment
2021 IEEE 5th Conference on Energy Internet and Energy System Integration (EI2)
Year: 2021 | Conference Paper |
Phase-locked loop guides the current phase angle for the converter. Fast phase angle tracking is important for the converter control effect and system stability. This paper proposes a fast tracking phase-locked loop based on complex vector form and phase difference interval judgment. The phase difference acquisition and loop control all adopt complex vector form. The phase difference interval is j...Show More
Unified Current Control Structure with Complex Vector Form for Both Single- and Three- Phase Grid-Connected Voltage Source Converter
2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)
Year: 2021 | Conference Paper |
With the rapid development of the power grid, more and more single- and three phase grid connected voltage source converters are demanded. This paper proposed a unified current control structure with complex vector form for both single- and three-phase grid-connected voltage source converter. The unified control structure can realize rapid design and convenient analysis of the single-and three pha...Show More
Dual Current Control Loops for Three-Phase Four-Leg Grid-Connected Inverter using Complex-Vector Form
2021 IEEE 1st International Power Electronics and Application Symposium (PEAS)
Year: 2021 | Conference Paper |
Three-phase four-leg inverter is the widely utilized energy conversion structure for power quality control, voltage/reactive power supporting and power transmission. This paper proposes dual current control loops for three-phase four-leg grid-connected inverter using complex-vector form to optimize the control calculation and realize zero steady-state error and fast regulation in the grid conditio...Show More
Unified Frequency Adaptive Filter for Both Single- and Three-Phase Utilization with Multi-Complex Resonators
2021 23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe)
Year: 2021 | Conference Paper |
To fast extract zero-steady-state error of fundamental frequency positive sequence, this paper proposes a unified frequency adaptive filter for single and three phase with multi complex resonators. The structure and principle of this filter are illustrated. The property of proposed filter is analyzed. Simulation results are provided to verify the effectiveness.Show More
An Instantaneous Reactive Current Individual-phase Detection Method and Digital Realization Based on Fourier Transform
2021 4th International Conference on Energy, Electrical and Power Engineering (CEEPE)
Year: 2021 | Conference Paper |
Cited by: Papers (2)
Currently, the frequency-domain detection methods based on Fourier Transform theory are widely used for reactive current detection, but they usually need the voltage phase information by means of phase locked loop (PLL), which will increase the algorithm complexity and may cause the reactive current detection errors. Therefore, this paper introduces an instantaneous reactive current detection meth...Show More
ROGI-PLL and Quasi-PI-Resonant Based Control Strategy for Unified Power Quality Controller
2021 IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia)
Year: 2021 | Conference Paper |
In the background of the power quality issues in the low-voltage distribution network, this paper makes a comprehensive and in-depth study on the three-phase three-wire unified power quality controller (UPQC) based on quasi-PI-resonant(quasi-PIR) controller and ROGI-PLL to improve the quality of power supply at the user’s side. Considering the typical characteristics of both harmonic current and h...Show More
Impedance-Based Stability Analysis Methods for DC Distribution Power System With Multivoltage Levels
Han Mu;Yao Zhang;Xiangqian Tong;Wu Chen;Bangbang He;Liangcai Shu;Xinbo Ruan;Xin Zhang;Fei Gao;Wu Cao;Zhixiang Zou
The stability analysis methods of single-bus dc distribution power systems (DPSs) have been widely studied; however, the multivoltage-level dc DPSs, which have been used in data center, all-electric ship, and so on, its stability analysis methods are rarely reported. The main focus of this article is to study the stability analysis methods, especially the impedance ratio of multivoltage-level dc D...Show More
Admittance Modeling, Analysis, and Reshaping of Harmonic Control Loop for Multiparalleled SAPFs System
Kangli Liu;Wu Cao;Shunyu Wang;Haotian Kang;Jianfeng Zhao;Mumu Wu;Dongchen Fan
Large-scale harmonic current pollution exists widely in power grid due to the massive applications of power electronic equipment, which affects the efficiency and reliable operation of the whole system. Owing to its excellent controllability, dynamic response performance, and compensation precision, the multiparalleled shunt active power filters (SAPFs) is widely used in the past few decades. Howe...Show More
Full Frequency Range Harmonic Suppression Strategy of Grid-connected Inverter Based on Feedforward of Grid Voltage
2020 12th IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)
Year: 2020 | Conference Paper |
The proportion of grid-connect inverter for renewable energy in power grid increases quickly. Using grid-connected inverter for harmonic suppression is necessary and inevitable. And LCL filter and control strategy are the main methods. In this paper the interact of grid-connect inverter with LCL filter and harmonic in grid voltage is analyzed. Then a feedforward function of grid voltage as the har...Show More
Reactive Power Analysis on Emergency DC Power Support Considering Excitation Control of Generators Near Inverter Station
2020 12th IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)
Year: 2020 | Conference Paper |
Cited by: Papers (1)
Emergency DC Power Support can improve the stability of the system voltage after single-circuit DC bipolar blocking. Insufficient reactive power of the inverter station will often cause the drop of bus voltage and DC power to be unable to increase to the specified value, which will reduce the effect of emergency DC power support. Improving excitation voltage of generators that are near the inverte...Show More
Inherent Interaction Analysis for Harmonic Oscillations in the Multi-Paralleled Grid-Connected Inverter System Using a Sum Type Criterion: Global Admittance (GA)
Wu Cao;Shunyu Wang;Haotian Kang;Kangli Liu;Qingsong Wang;Jianfeng Zhao
With the extensive use of power electronics converters, harmonic oscillation issues in the multi-paralleled grid-connected inverter system have drawn much attention. Apart from the stability analysis using the impedance-based stability analysis method, the interaction analysis is aimed at revealing the changing process of the system state under the variation of some parameters such as the grid imp...Show More
Dual-Loop-Based Harmonic Current Control Strategy and Admittance Modeling for a Multimodular Parallel SAPFs System
A large-capacity harmonic current widely exists in low-voltage distribution networks, which seriously affects the operation reliability and the efficiency of power system and related equipment. Due to its excellent controllability and dynamic response performance, the full-controlled semiconductor-device-based multimodular shunt active power filter is considered as the optimal choice to compensate...Show More
Improved Single-Loop Voltage Control with Stability Enhancement Using Second Order Generalized Integrator (SOGI)
2019 9th International Conference on Power and Energy Systems (ICPES)
Year: 2019 | Conference Paper |
Cited by: Papers (2)
Single-loop voltage control of LC-filtered inverters has been investigated for many years because of the low cost and high reliability. However, the conventional single-loop resonant control is only possible if the resonance frequency of LC-filter higher than one-sixth of the sampling frequency. To expand stability region and optimize performance of LC-filtered inverters, a single-loop voltage con...Show More
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