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Analysis on the Non-minimum Phase Behavior of the Weak Grids Connected VSC
2024 3rd Asian Conference on Frontiers of Power and Energy (ACFPE)
Year: 2024 | Conference Paper |
The non-minimum-phase behavior of the weak grids connected VSCs is studied with transfer function-based methods. The model of the the weak grids connected VSC is firstly built with reduced-order multi-input multi-output (MIMO) representation. Then, the single-input single-output (SISO) model is further derived, without changing the structure and parameters of the studied system. The routh criterio...Show More
Analysis of Transmission Distance of the MMC-HVDC Connecting Islanded Renewable Energy Generation System
Lin Yu;Bing Zhao;Shanshan Wang;Zhida Su;Guanglu Wu;Tiezhu Wang
2024 6th Asia Energy and Electrical Engineering Symposium (AEEES)
Year: 2024 | Conference Paper |
Unlike the conventional Line-Commuted Converter High Voltage Direct Current (LCC-HVDC) system, the Modular Multilevel Converter High Voltage Direct Current (MMC-HVDC) system experiences no commutation failures. It enables the transmission of islanded renewable energy generations (REGs) to the power grid. The Short-Circuit Ratio (SCR) is traditionally used to evaluate the strength of power systems ...Show More
Analysis and Suppression of AC Faults in Receiving-End of Hybrid Cascaded Multi-Terminal HVDC
Yonghao Ren;Shanshan Wang;Tingwei Liu;Jianyun Liu;Huadong Sun
2024 IEEE 3rd International Conference on Electrical Engineering, Big Data and Algorithms (EEBDA)
Year: 2024 | Conference Paper |
Hybrid Cascaded Multi-Terminal HVDC (HC-MTDC) combines the advantages of Line Commutated Converters (LCC) and Modular Multilevel Converters (MMC). However, the coupling between LCC and MMC on the AC/DC side also brings new challenges. Additionally, the transient recovery characteristics after receiving-end AC grid faults adversely affect the DC fault clearance capability. Therefore, this paper ana...Show More
Research on the Active Power Control Stability of the Renewable Energy Connected to Weak Grids
Guanglu Wu;Shanshan Wang;Bing Zhao;Dongwei Wang;Chao Yuan;Quan Ma;Shuaifei Zheng;MingJian Fan
2023 6th International Conference on Power and Energy Applications (ICPEA)
Year: 2023 | Conference Paper |
This paper proposes a novel method to analyze the stability of grids-connected VSC based on its single-input single-output (SISO) open-loop transfer function model. Unlike the traditional eigenvalue analysis, impedance analysis or complex torque analysis, the transfer function based analysis is applied. And the multi-input multi-output (MIMO) model of grids-connected VSC is derived firstly and sim...Show More
Research on Digital Analog Real-Time Simulation of Security Control Strategies for Large Scale New Energy Through Multi-Terminal VSC-HVDC Transmission Systems
Weibo Huang;Yiying Zhu;Limin Yang;Shanshan Wang;Shaobo Lin;Xiao Lei
2023 International Conference on Power System Technology (PowerCon)
Year: 2023 | Conference Paper |
With the increasing of installed capacity of new energy, the operational characteristics of large-scale new energy diverting systems with VSC-HVDC grid connection are becoming increasingly complex. It poses a huge challenge to safe and stable operation of the system. The principles of safety and stability control strategies for large-scale new energy transmission systems through VSC-HVDC transmiss...Show More
Research on the AC voltage control stability of the renewable energy connected to weak grids
G. Wu;D. Wang;Y. Feng;B. Wang;P. Wu;S. Wang;B. Zhao;Q. Ma;Y. Zou;Z. Zhang
12th International Conference on Renewable Power Generation (RPG 2023)
Year: 2023 | Conference Paper |
To achieve the carbon peak and neutrality goals, the power system is developing towards a power system with higher penetration of renewable power generations. The characteristics of the power electronic converters are different from the traditional synchronous generators which decreases the voltage support cap ability and brings a big challenge to the voltage control stability. Firstly the outer l...Show More
Research on the DC Overvoltage Mechanism of MTDC System When Switching from Point to Point Mode to Three Terminal Operation Mode
Yanbo Feng;Shanshan Wang;Guanglu Wu;Bing Zhao;Peng Zi;Hongying Peng
2023 6th International Conference on Energy, Electrical and Power Engineering (CEEPE)
Year: 2023 | Conference Paper |
The simulation results show that in the process of switching the true bipolar MTDC system from point-to-point operation mode to the three-terminal operation mode, there is a high risk of oscillation overvoltage during the charging process of the unloaded DC transmission line. Firstly, the equivalent model that describes the charging process of the unloaded DC transmission line is built. And the ci...Show More
Modal Analysis-Based Analytical Method for Frequency Estimation During Inertia Response Stage of Power Systems
Tiezhu Wang;Shicong Ma;Shanshan Wang;Weilin Hou;Juncheng Gao;Jianbo Guo;Xiaoxin Zhou
With the increasing adoption of renewable energy and HVDC transmission systems, the power system may experience large power fluctuations due to HVDC faults, potentially causing the rate of change of frequency (RoCoF) or frequency deviation limit to be exceeded during the inertia response phase. The system’s ability to withstand these disturbances primarily depends on the amount of system inertia, ...Show More
Non-Minimum Phase Behavior Analysis of the Weak Grid-Tied VSC's Q-Axis Current Control Dynamics
Rui Yin;Huadong Sun;Yuanyuan Sun;Bing Zhao;Shanshan Wang;Guanglu Wu;Kaiqi Sun
In this letter, the phenomenon is found that there are non-minimum phase and “undershoot” behavior in grid-tied VSC, even if the outer loop is not applied. Based on the small-signal model, the mechanism that q-axis-related non-minimum phase behavior reduces VSC's stability and the “undershoot” behavior are analyzed in the letter. It is found that the q-axis current control dynamics of weak grid-ti...Show More
Analysis of AC Failure of New Energy Transmission System via Flexible DC Grid under Island and Grid-connected Operation Mode
Zhongjian Kang;Anqi Zhang;Bing Zhao;Shanshan Wang;Guanglu Wu;Quan Ma
2022 7th Asia Conference on Power and Electrical Engineering (ACPEE)
Year: 2022 | Conference Paper |
The new energy transmission system through flexible DC grid needs to have two operation modes–island mode and parallel operation conditions with the AC grid. Therefore, it is necessary to study the similarities and differences of the failure mechanism of the system under the two operation modes. Analyzing the risk of overvoltage and overcurrent during failure is also of vital importance. This stud...Show More
A New Adaptive DC Voltage Droop Control for Hybrid Cascaded HVDC Transmission System
2022 4th Asia Energy and Electrical Engineering Symposium (AEEES)
Year: 2022 | Conference Paper |
Cited by: Papers (1)
Hybrid cascaded multi-terminal HVDC transmission technology is a research hotspot in the field of DC transmission. The system topology adopts line commutated converter (LCC) converters at the sending end and high-end LCC converters at the receiving end in series with multiple low-end MMC converters. When the modular multilevel converter (MMC) occur an AC side failure or a blocking failure, the sur...Show More
Stability Analysis of the Grid-Tied VSC Considering the Influence of Short Circuit Ratio and X/R
The grid impedance ratio X/R (GIR) and the short circuit ratio (SCR) are the indexes that widely applied to the stability analysis of power systems integrated with voltage source converters (VSC). Based on the assumption that GIR is large enough, the impacts of grid resistances are neglected in most studies. In this brief, the impact mechanisms of grid impedance are analyzed by single-input and si...Show More
Converter-Driven Low-Frequency Stability Analysis and Compensation in Weak-Grid-Tied VSCs
Guanglu Wu;Shanshan Wang;Bing Zhao;Hong Hu;Jianhua Li;Lu Cao;Haoyin Ding;Lin Yu;Quan Ma
2021 International Conference on Power System Technology (POWERCON)
Year: 2021 | Conference Paper |
Cited by: Papers (1)
This paper analyzes converter-driven low- frequency oscillations of current controlled weak-grid-tied voltage-source converters (VSCs) and proposes an effective method to improve the dynamic behavior. First, the specific single-input single-output (SISO) open-loop transfer function from the active power to the active power reference is obtained. From the SISO transfer function, it is revealed that...Show More
Low-Frequency Converter-Driven Oscillations in Weak Grids: Explanation and Damping Improvement
Guanglu Wu;Huadong Sun;Bing Zhao;Shiyun Xu;Xi Zhang;Agustí Egea-Àlvarez;Shanshan Wang;Gen Li;Yingbiao Li;Xiaoxin Zhou
Low-frequency oscillations have been reported in several weak-grids-connected voltage-source-converter(VSC) systems. Although efforts have been devoted to understanding the parametric and sensitivity impact of the VSC controller gains, a general formulation of the oscillation mechanism is still missing. Using transfer function dynamic modelling approach, we find that the outer loop active power co...Show More
Grid Impedance Impact Analysis of the Weak Grid-Tied VSC
Hong Hu;Rui Yin;Shanshan Wang;Yuanyuan Sun;Guanglu Wu;Bing Zhao;Jianhua Li;Haoyin Ding;Lu Cao;Lin Yu
2021 IEEE Green Technologies Conference (GreenTech)
Year: 2021 | Conference Paper |
Cited by: Papers (1)
The grid impedance is widely recognized as the key factor to the stability of the grid-tied power electronic devices. However, the influence of the grid impedance ratio is always neglected due to the assumption that grid reactance is much large than grid resistance. In this paper, it is found that the grid impedance has a different impact on the stability with the reduction of grid impedance ratio...Show More
BPA based Selection Method for MMC Reactive Power Control Mode
2021 3rd Asia Energy and Electrical Engineering Symposium (AEEES)
Year: 2021 | Conference Paper |
Cited by: Papers (1)
Modular multilevel converter (MMC) usually adopt direct current control, which can be divided into inner loop current controller and outer loop power controller. The control modes of the outer loop power controller can be divided into active power control and reactive power control. When MMC is connected to AC system, it is necessary to select control mode and control setting values for MMC. This ...Show More
Analysis of the Hybrid-MMC-HVDC Short-Circuit Current under MMC AC System Symmetrical Fault
Shengya Sun;Shanshan Wang;Yuanyuan Sun;Xiao Yu;Rui Yin;Hong Hu;Haoyin Ding;Jianhua Li;Lu Cao
2021 3rd Asia Energy and Electrical Engineering Symposium (AEEES)
Year: 2021 | Conference Paper |
Cited by: Papers (5)
The characteristics of short-circuit current provided by modular multilevel converter (MMC) is analyzed after three-phase short-circuit fault occurs at PCC (Point of Common Coupling) of AC system, based on the operation control principle and short-circuit grounding modes of the converter in this paper. First of all, this paper introduced the structure and control principle of MMC. Furthermore, the...Show More
ADPSS Based Short-circuit Current Calculation Method of MMC
Xiao Yu;Shanshan Wang;Bing Zhao;Zhida Su;Hongfu Wang;Hongying Peng
2021 11th International Conference on Power, Energy and Electrical Engineering (CPEEE)
Year: 2021 | Conference Paper |
Modular multilevel converter (MMC) has broad application prospects in new energy transmission. When a MMC is connected to an active AC grid, it is necessary to calculate the three-phase symmetrical short-circuit current contribution of MMC to ensure the safety of power system. The existing method used in actual engineering projects consider MMC as a current source of which the amplitude is the cur...Show More
Impact of Non-Minimum-Phase Zeros on the Weak-Grid-Tied VSC
Guanglu Wu;Bing Zhao;Xi Zhang;Shanshan Wang;Agustí Egea-Àlvarez;Yuanyuan Sun;Yingbiao Li;Deyang Guo;Xiaoxin Zhou
Right-half-plain (RHP) zeros can significantly deteriorate a control system's dynamic performances as it exhibits non-minimum-phase behaviors. In this paper, we investigate the occurrence mechanism of RHP zeros in weak-grid-tied VSCs as well as provide guidance for minimizing their effects. A reduced-order multi-input multi-output (MIMO) transfer function of the weak-grid-tied VSC is firstly obtai...Show More
PLL Synchronization Stability Analysis of MMC-Connected Wind Farms Under High-Impedance AC Faults
Yingbiao Li;Xiongfei Wang;Jianbo Guo;Heng Wu;Bing Zhao;Shanshan Wang;Guanglu Wu;Tiezhu Wang
This article analyzes the transient stability of an offshore wind farm connected via modular multilevel converter (MMC)-based high-voltage direct-current transmission system. The wind farm is composed by full-scale type-4 wind turbines, whereas short-circuit faults occurring in between the MMC and wind farm are considered. The MMC tends to be switched to the current limiting mode or the overmodula...Show More
Parameter Design Oriented Analysis of the Current Control Stability of the Weak-Grid-Tied VSC
Guanglu Wu;Huadong Sun;Xi Zhang;Agustí Egea-Àlvarez;Bing Zhao;Shiyun Xu;Shanshan Wang;Xiaoxin Zhou
This paper studies the dynamic behaviors of weak-grid-tied VSCs with simplified transfer functions, which provides an accurate stability analysis and useful indications for tuning system parameters. A reduced-order multi-input multi-output (MIMO) transfer function that contains four single-input single-output (SISO) transfer functions for the weak-grid-tied VSC is first presented. It is found that...Show More
Comparison of Dynamic Behaviour between Average Model and Switch Function Based Model VSC-HVDC Converters
Salehe S. Malamla;Shanshan Wang;Guanglu Wu;Shanmeng Qin;Yuanyuan Sun;Bing Zhao;Rui Yin;Qingshen Xu
2020 IEEE/IAS Industrial and Commercial Power System Asia (I&CPS Asia)
Year: 2020 | Conference Paper |
Cited by: Papers (4)
One of the qualities of a good high voltage direct current (HVDC) system is robustness. The system should produce the output with very minimum harmonics distortion, and it should be stable against both small and large disturbances. In this paper, to determine the better model configuration of voltage source converter (VSC) that has both minimum harmonic distortion at the output and strong resistan...Show More
An Improved NLM Strategy for MMC Emergency Power Control
Yang Xing;Hui Wang;Tao Zhang;Shanshan Wang;Bing Zhao;Tiezhu Wang
2020 IEEE/IAS Industrial and Commercial Power System Asia (I&CPS Asia)
Year: 2020 | Conference Paper |
Cited by: Papers (3)
This paper proposes an improved nearest level modulation (NLM) strategy for the modular multilevel converter (MMC) station to realize emergency power control. The sending-end MMC station whose ac side is connected to the islanded renewable power plant must control the ac voltage amplitude and frequency. The power flowing into the MMC station is uncontrolled. Power surplus situation (ac input power...Show More
Analysis on the Low-Frequency Bifurcation Phenomena of Weak-Grid-Tied VSCs
Guanglu Wu;Shanshan Wang;Xi Zhang;Bing Zhao;Yingbiao Li;Tiezhu Wang
2020 IEEE International Symposium on Circuits and Systems (ISCAS)
Year: 2020 | Conference Paper |
Voltage source converters (VSCs) have been increasingly applied in power systems for the past decade, whose interactions with the grid give rise to a variety of complex behaviors. In this paper, we study the low-frequency bifurcation phenomena of weak-grid-tied VSCs considering the phase-locked loop (PLL). The linearized state-space representation of the weak-grid-tied VSC system is firstly obtain...Show More
A Control Strategy for Suppressing the DC Overvoltage under the Fault of DC Power Grid
Shanshan Wang;Yuetong Zhao;Bing Zhao;Tiezhu Wang;Yuanyuan Sun;Rui Yin
2020 4th International Conference on Green Energy and Applications (ICGEA)
Year: 2020 | Conference Paper |
Unbalanced power in DC power grid causes DC overvoltage, which damages the capacitors, IGBT and other devices, so it is essentially important to suppress the DC overvoltage. Aiming at the problem of DC overvoltage suppression, this paper proposes a new control strategy to suppress the rise of DC voltage by adding DC voltage signal to traditional constant AC voltage controller. Firstly, the mechani...Show More
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