Yao Sun

Yao Sun

Central South University

H-index: 40

Asia-China

About Yao Sun

Yao Sun, With an exceptional h-index of 40 and a recent h-index of 35 (since 2020), a distinguished researcher at Central South University, specializes in the field of matrix converter, microgrid, wind energy..

His recent articles reflect a diverse array of research interests and contributions to the field:

Frequency-Divided Resistance-Emulating Control of Grid-Connected Voltage Source Rectifiers Under Unbalanced Grids

A Communication-free Economic Dispatch Control Scheme of Cascaded-type Microgrids for Operating Cost Minimization

Modulated-Coupled-Inductor-Based ISOP Phase-Shifted Full-Bridge Converter with Wide ZVS Range and Reduced Duty Cycle Loss

Implementation and Stability Analysis of An Improved V/f Induction Motor Control Scheme based on Constant Rotor Flux

High-efficiency Modulation Scheme for Three-Level Buck Four-Leg Current-Source Inverter

Algebraic Modulation Strategy for Direct Matrix Converter With Adaptation to Unbalanced Grids

Fuzzy Granulation Interval-Based Fault Diagnosis Method for Ring-Type DC Microgrid

A First-Order PLL-Synchronized Voltage-Supporting Control Method for Parallel Inverters with Near-Zero Line Impedance

Yao Sun Information

University

Central South University

Position

___

Citations(all)

6352

Citations(since 2020)

4992

Cited By

2888

hIndex(all)

40

hIndex(since 2020)

35

i10Index(all)

130

i10Index(since 2020)

114

Email

University Profile Page

Central South University

Yao Sun Skills & Research Interests

matrix converter

microgrid

wind energy.

Top articles of Yao Sun

Frequency-Divided Resistance-Emulating Control of Grid-Connected Voltage Source Rectifiers Under Unbalanced Grids

Authors

Wenjing Xiong,Weihao Yuan,Jianheng Lin,Zhengmei Lu,Shiming Xie,Yonglu Liu,Yao Sun,Mei Su

Journal

IEEE Transactions on Power Electronics

Published Date

2024/1/17

DC-link voltage pulsation is a technical challenge for grid-connected three-phase voltage source rectifiersunder unbalanced grids. To suppress dc-link voltage ripples arising from unbalanced grids, a frequency-divided resistance-emulating control strategy is proposed in this letter. According to the frequency-divided idea, the dc-link voltage control loop consists of two parts: one dedicated to regulating the average voltage and the other focused on suppressing pulsating voltage. The inner loop is synchronized based on the resistance-emulating approach. The frequency-divided resistance-emulating control offers the following advantages: grid voltage sensors are eliminated, detailed information about circuit parameters is not required, and easy to implement because only one proportional–integral controller, one quasi-proportional–resonantcontroller, and two bandpass filters are used. To sum up, the proposed …

A Communication-free Economic Dispatch Control Scheme of Cascaded-type Microgrids for Operating Cost Minimization

Authors

Lang Li,Yao Sun,Zhangjie Liu,Mei Su

Journal

IEEE Journal of Emerging and Selected Topics in Power Electronics

Published Date

2024/3/4

This article addresses the economic dispatch problem in cascaded-type microgrids (CMGs), aiming to minimize operating costs while accounting for capacity constraints, frequency restoration, and load voltage quality. To solve the problem, we propose a communication-free economic dispatch control scheme. In the proposed method, the frequency term is based on the local transmission line current to ensure the power factor angle consistency and achieve frequency restoration. The output voltages of distributed generators (DGs) are regulated using an optimal economic optimization function to minimize the total active operating costs (TAOCs) and ensure the load voltage quality of CMGs. The proposed control scheme offers several key advantages: 1) the construction of the proposed scheme only requires local voltage and current measurements, eliminating the need for communication and making it a fully …

Modulated-Coupled-Inductor-Based ISOP Phase-Shifted Full-Bridge Converter with Wide ZVS Range and Reduced Duty Cycle Loss

Authors

Kang Hong,Guo Xu,Yonglu Liu,Yao Sun,Mei Su

Journal

IEEE Transactions on Power Electronics

Published Date

2024/1/16

This paper proposes a modulated-coupledinductor-based input-serial-output-parallel (ISOP) phase- shifted full-bridge (PSFB) converter. Instead of using the variable saturation inductor in conventional method, the adoption of modulated-coupled-inductor simplifies the control complexity without additional auxiliary circuits. The equivalent leakage inductance of the converter is determined by the operating phases of the two modules. Therefore, it can be easily changed by modulating the phase difference between the two modules to achieve zero-voltage switching (ZVS) at light load condition and reduce duty cycle loss at heavy load condition. The propose d topology, operating principle, and the characteristics are analyzed in this paper. Finally, the experimental results have verified the realization of ZVS, and the comparison with the traditional converter have verified the wide load regulation range

Implementation and Stability Analysis of An Improved V/f Induction Motor Control Scheme based on Constant Rotor Flux

Authors

Hanbing Dan,Mengchao Qian,Hui Wang,Yonglu Liu,Yao Sun,Mei Su

Journal

IEEE Transactions on Energy Conversion

Published Date

2024/3/4

An improved volts per hertz ( V/f ) control scheme based on constant rotor flux for induction motors is proposed in this paper to improve the low-speed performance and solve the problem of speed droop when loaded. A voltage drop compensation method is adopted to ensure correct excitation and a slip compensation method is proposed to decrease speed error. Different from adopting ideal excitation voltage in most previous research, the actual excitation voltage calculated from induction motor model is applied. Meanwhile, an oscillation suppression method is incorporated to mitigate current oscillation and ensure stability. And system's stability is proved with the small signal model analysis method. Finally, the effectiveness and correctness of the proposed scheme is verified by the experimental results on 5.5kW induction motor experimental platform.

High-efficiency Modulation Scheme for Three-Level Buck Four-Leg Current-Source Inverter

Authors

Baoxuan Chen,Yao Sun,Shiming Xie,Yonglu Liu,Mei Su

Journal

IEEE Transactions on Power Electronics

Published Date

2024/3/4

Four-leg current source inverter (4L-CSI) has abilities of zero-sequence current handling, voltage boosting, and output short-circuit protection, but it also has the drawbacks of bulkiness and low efficiency. To address these drawbacks, a three-level buck 4L-CSI (3L-Buck-4L-CSI) topology and a simple and high-efficiency modulation scheme are proposed. Due to the multilevel characteristics of 3L-Buck-4L-CSI, the volume of its dc inductor can be reduced greatly and the dc-link current could respond quickly. The proposed modulation scheme is an algebraic modulation scheme, in which the duty cycles are obtained by solving algebraic equations simply and directly. In addition, it reduces the dc-link current and the average switching frequency compared with conventional modulation schemes, which improves the efficiency of the converter. The experimental results validate the effectiveness of the proposed topology …

Algebraic Modulation Strategy for Direct Matrix Converter With Adaptation to Unbalanced Grids

Authors

Wenjing Xiong,Qiwei Xie,Jianheng Lin,Weihao Yuan,Hanbing Dan,Yao Sun,Mei Su

Journal

IEEE Transactions on Power Electronics

Published Date

2024/2/26

Owing to the direct coupling between the input and output, the input/output currents of the direct matrix converter (DMC) are sensitive to grid disturbances, especially unbalanced grids. To mitigate the adverse effects caused by unbalanced grids, an algebraic modulation strategy is developed for the DMC in this paper. Based on the algebraic theory, the general solution of the modulation vector is first derived. By utilizing the free variables, sinusoidal input/output currents are ensured despite whether the grid is balanced or not. The impact of offset variables is analyzed and they are designed to realize three-level output characteristics. Furthermore, the switching sequence is arranged without bipolar operating mode. The presented algebraic modulation strategy has the following features: 1) easy to implement; 2) three-level output voltage synthesis; 3) effective under either balanced or unbalanced grids. The …

Fuzzy Granulation Interval-Based Fault Diagnosis Method for Ring-Type DC Microgrid

Authors

Hongyi Liu,Hua Han,Xinlong Zheng,Yao Sun,Mei Su,Tao Ling,Xubin Liu

Journal

IEEE Transactions on Smart Grid

Published Date

2024/1/29

The lack of relevant protection schemes and standards brings significant challenges to the promotion of direct current microgrid (DCMG) technologies. The existing line fault diagnosis methods usually require additional measuring devices to obtain fault signals. Although reducing the number of sensors can lower the system costs, it also increases the difficulty of diagnosis. Pole-to-pole (PP) and positive pole-to-ground (PPG) fault classification under unknown fault resistance, and negative-to-ground (NPG) fault detection under unobvious positive pole current characteristics are two major difficulties. To solve the above issues, a fuzzy granulation interval (FGI) theory-based line fault diagnosis method is proposed in this paper. Only locally measured bus-side voltage and positive pole current signals shared with the converter controller inputs are required. Firstly, the fault characteristics and diagnosis difficulties are …

A First-Order PLL-Synchronized Voltage-Supporting Control Method for Parallel Inverters with Near-Zero Line Impedance

Authors

Shimiao Chen,Yao Sun,Xiaochao Hou,Xinlong Zheng,Mei Su,Kai Sun

Journal

IEEE Transactions on Power Electronics

Published Date

2024/4/9

Synchronization and power-sharing control are essential for islanded parallel inverters. Traditionally, droop control and other grid-forming control are the typical methods with voltage-supporting abilities. However, those methods only apply to systems with a certain line impedance. For the application of uninterruptible power supply (UPS) systems with near-zero line impedance, droop-controlled inverters are prone to loss of stability. To address this issue, this letter introduces a new first-order phase-lock-loop (PLL)-synchronized voltagesupporting control method for the islanded operation of parallel inverters in UPS systems. It is found that the first-order PLL is employed for frequency synchronization in islanded operation. Meanwhile, voltage support and power sharing can be guaranteed with modified current control. Experimental results validate the feasibility of the proposed method

A modified VSG control scheme with virtual resistance to enhance both small-signal stability and transient synchronization stability

Authors

Shimiao Chen,Yao Sun,Hua Han,Siqi Fu,Shihan Luo,Guangze Shi

Journal

IEEE Transactions on Power Electronics

Published Date

2023/2/7

The existing studies show that the virtual resistance scheme has positive effects on synchronous resonance suppression but negative effects on transient synchronization stability of virtual synchronous generator (VSG). To address this contradiction, this article proposes a modified VSG control scheme. The basic idea is that the virtual active power at virtual PCC, instead of real active power, is introduced as the power feedback into the control loop. Then, the effect of virtual resistance on transient stability can be equivalent to that of grid resistance, which improves transient stability. Besides, a proportion–integral controller is added at the forward loop to control the real active power to track the power reference. Compared with the existing VSG control methods, the modified VSG control scheme can well solve the conflict caused by virtual resistance between small-signal stability and transient stability. The effectiveness …

A Novel Method for Estimating the Region of Attraction for DC Microgrids via Brayton-Moser’s Mixed Potential Theory

Authors

Zhenxi Wu,Hua Han,Zhangjie Liu,Mei Su,Yao Sun,Xin Zhang,Peng Wang

Journal

IEEE Transactions on Smart Grid

Published Date

2023/3/27

To avoid instability caused by abrupt load changes or contingencies, the region of attraction (ROA) estimation is significant for large-signal stability analysis of the power system. This letter proposes a novel method to estimate ROA of DC microgrids containing constant power loads (CPLs). Compared with the existing methods, an obvious advantage of the proposed method can reduce computations greatly, which is applicable to large-scale DC power grids. Finally, the feasibility of the proposed method is verified by case studies.

Large-Signal Stability Analysis of AC Network under Quadratic Droop Control

Authors

Zhangjie Liu,Liya Huang,Ziqing Xia,Xubin Liu,Hua Han,Yao Sun,Mei Su

Journal

IEEE Transactions on Smart Grid

Published Date

2023/5/29

Quadratic droop control is an innovative control strategy for power network, aiming to respect the inherently quadratic nature of reactive power flow. However, the system stability under quadratic droop control has not been addressed completely so far. This paper mainly focuses on the large-signal stability analysis of the AC network under quadratic droop control. We firstly analyze the stability of each equilibrium, it is concluded that the high-voltage equilibrium is stable as long as it exists while all low-voltage equilibria are unstable. Secondly, an analytical energy function for the system under quadratic droop control is established. It is proved that the high-voltage equilibrium is the local minimum of the proposed energy function while all the low-voltage equilibria are saddle points. Thirdly, to estimate the region of attraction (ROA) of the high-voltage equilibrium, an innovative method based on the analytical energy …

Filippov-based Stability Analysis Method for Digitally Controlled DC-DC Converters

Authors

Jian Ning,Yao Sun,Jianheng Lin,Guo Xu,Mei Su

Journal

IEEE Transactions on Transportation Electrification

Published Date

2023/7/18

In contrast to Poincaré map, Filippov’s method is an approach allowing an explicit representation of the Jacobian matrix (the so-called monodromy matrix) which determines the stability of the periodic orbit. However, the existing Filippov’s method was derived for the switching manifold under analog control, which limits its applications to digitally controlled power converters. To fill this gap, Filippov’s method is extended for digitally controlled DC-DC power converters in this paper. The analytical expressions of the saltation matrix for digitally controlled power converters with k +1 switching states are derived and the corresponding monodromy matrix is established. Once the steady-state trajectory of the system has been obtained, it is easy to determine both the fast-scale and slow-scale stability of the power converter by calculating the eigenvalues of the monodromy matrix. Finally, a digitally controlled dual active …

Recursive Admittance Matrix for Virtual Synchronous Generators with Asymmetric Loads

Authors

Ying Jiang,Yao Sun,Yangguang Sun

Published Date

2023/11/10

With more and more distributed energy connect to the power system, the inverter needs to adopt a suitable control scheme to ensure the safety and stability of the system. Virtual synchronous generator (VSG) control algorithm can improve the stability of weak grid system to some extent by mimicking the dynamic characteristics of traditional rotary synchronous generator. However, when considering the frequency coupling effect, the impedance model of VSG needs to be established through complex matrix operation, which is inconvenient for system analysis and design, especially when the VSG system connect with asymmetric loads. In this paper, a recursive admittance matrix model for VSG system is proposed, which avoids complex matrix operations and convolution operations. At last, the accuracy of the recursive admittance matrix model and the correctness of the recursive modeling method are verified through …

A Decentralized Master-slave Method for Three-Phase Cascaded H-bridge System

Authors

Guangze Shi,Hua Han,Yao Sun,Junlan Ou,Abderezak Lashab,Josep M Guerrero

Journal

IEEE Journal of Emerging and Selected Topics in Industrial Electronics

Published Date

2023/9/1

For the cascaded H-bridge system, the existing decentralized methods are mainly focused on single-phase systems. Designing a decentralized method for the three-phase cascaded H-bridge system is more challenging, particularly, for achieving phase-to-phase frequency synchronization and three-phase voltage balance without real-time communication among each distributed generation (DG). To achieve this, this article proposes a decentralized master-slave method for three-phase cascaded H-bridge systems, where no communication is required for each local control unit of DGs. The overall control is divided into two parts. One part is for the master DG to realize phase synchronization among phases A, B, and C, which is designed by modifying the power factor angle through droop control. The other part is for slave DGs to achieve frequency synchronization of the modules in each phase, which adopts the …

Common-mode circuit analysis of current-source photovoltaic inverter for leakage current and EMI

Authors

Xin Li,Yao Sun,Li Jiang,Hui Wang,Yonglu Liu,Mei Su

Journal

IEEE Transactions on Power Electronics

Published Date

2023/1/31

Leakage current and electromagnetic interference (EMI) are closely related to the common-mode (CM) circuit in transformerless photovoltaic inverter systems. However, the correlation between them is elusive, as they are always studied independently because of the different frequency bands involved. This article establishes the CM circuit models of the current-source inverter, and the inherent relationship and the affecting factors between leakage current and CM EMI are revealed. Based on the established models, the leakage current and conducted EMI are accurately predicted with a reduced computational burden. In addition, some suppression measures for leakage current and CM EMI are derived, including the effectiveness of connecting a neutral wire. Finally, through simulations and experiments, the correctness of the theoretical analysis is verified.

Review of dual active bridge converters with topological modifications

Authors

Liting Li,Guo Xu,Deshang Sha,Yonglu Liu,Yao Sun,Mei Su

Published Date

2023/3/17

The dual-active-bridge (DAB) converters inherit favorite features including zero-voltage switching (ZVS) capability, wide voltage range, and natural bidirectional power flow. Facing different applications and high market requirements, conventional DAB topologies with various modulations are gradually inadequate, so topological modifications are emerged in the literature to deal with these situations. Based on their characteristics of these modified DAB topologies, in this article, we provide a comprehensive review and classification, and the methodology to modify DAB topologies is proposed. First, basic cells including input/output types, active bridges, transformers, and auxiliary high-frequency networks are introduced. Next, by combining these cells flexibly, modified DAB converters are derived, and they are classified in terms of structural characteristics and discussed in detail. Finally, the characteristics, merits, and …

Correction to: Advanced Control and Protection of Modular Uninterruptible Power Supply Systems

Authors

Jinghang Lu,Baoze Wei,Xiaochao Hou,Yao Sun

Published Date

2023/5/4

The updated versions of the chapters can be found at: https://doi. org/10.1007/978-3-031-22178-1_8 https://doi. org/10.1007/978-3-031-22178-1_9 https://doi. org/10.1007/978-3-031-22178-1_10

A Modulation Scheme to Reduce Leakage Current of Split-Capacitor Four-Wire Current Source Inverter

Authors

Xin Li,Yao Sun,Li Jiang,Shiming Xie,Yonglu Liu,Mei Su

Journal

IEEE Transactions on Power Electronics

Published Date

2023/7/18

The transformer-less split-capacitor four-wire current source inverter is effective to reduce leakage current, but its effect is closely related to the impedance of the neutral wire and common mode voltage. The leakage current can be almost eliminated when the impedance of the neutral wire is zero, but the zero impedance condition does not hold in practice. To further suppress the leakage current, a new carrier-based modulation scheme with reduced common mode (CM) voltage is proposed in this article. The resulting CM voltage (peak-to-peak) is half that of the conventional modulation scheme. Moreover, the conducted interference is also effectively reduced. The experimental results validate the effectiveness of the proposed modulation scheme.

Distributed Control Strategy Based on Line Impedance Identification for Reactive Power Sharing in Microgrid

Authors

Yuxin Cheng,Hua Han,Hongfei Wang,Shujin Chen,Yao Sun,Linxiang Fei

Published Date

2023/10/29

In microgrids (MGs), general distributed control schemes cannot achieve both accurate power sharing and voltage recovery under the unknown and difference of line impedances. To solve this problem, a new two-level scheme based on line impedance identifications and distributed communication is proposed for AC microgrids with any line impedances. Firstly, a distributed estimator is designed to identify the bus voltage and line impedance parameters. Secondly, a unified droop control based on line impedance estimation is proposed to achieve reactive power sharing without considering line impedances mismatching. Finally, a distributed compensation protocol based on bus voltage identification is presented, and accurate voltage recovery and reactive power sharing for AC microgrids are obtained. Small signal stability analysis and simulation results verify the effectiveness of the proposed strategy.

Control, Operating Limitations and Stability Analysis for Single-Phase Quasi-Z-Source Inverters with Reduced Capacitance

Authors

Xin Li,Yao Sun,Yonglu Liu,Li Jiang,Mei Su

Journal

IEEE Journal of Emerging and Selected Topics in Industrial Electronics

Published Date

2023/8/16

The inherent twice frequency ripple power (TFRP) in single-phase quasi-Z source inverters (qZSI) should be handled well to avoid its adverse effects. The existing solutions often require additional hardware devices, which increases costs and power losses inevitably, and even tightens operation constraints. This paper proposes a control method to buffer the TFRP without any additional hardware. The operation principle analysis is provided in detail. And the controller design and stability analysis based on the principle of time-scale separation and feedback linearization are presented. In addition, operating limitations of the inverter is found, which provides a guide for system design and normal operation. Experimental results verified the effectiveness of the proposed control method.

See List of Professors in Yao Sun University(Central South University)

Yao Sun FAQs

What is Yao Sun's h-index at Central South University?

The h-index of Yao Sun has been 35 since 2020 and 40 in total.

What are Yao Sun's top articles?

The articles with the titles of

Frequency-Divided Resistance-Emulating Control of Grid-Connected Voltage Source Rectifiers Under Unbalanced Grids

A Communication-free Economic Dispatch Control Scheme of Cascaded-type Microgrids for Operating Cost Minimization

Modulated-Coupled-Inductor-Based ISOP Phase-Shifted Full-Bridge Converter with Wide ZVS Range and Reduced Duty Cycle Loss

Implementation and Stability Analysis of An Improved V/f Induction Motor Control Scheme based on Constant Rotor Flux

High-efficiency Modulation Scheme for Three-Level Buck Four-Leg Current-Source Inverter

Algebraic Modulation Strategy for Direct Matrix Converter With Adaptation to Unbalanced Grids

Fuzzy Granulation Interval-Based Fault Diagnosis Method for Ring-Type DC Microgrid

A First-Order PLL-Synchronized Voltage-Supporting Control Method for Parallel Inverters with Near-Zero Line Impedance

...

are the top articles of Yao Sun at Central South University.

What are Yao Sun's research interests?

The research interests of Yao Sun are: matrix converter, microgrid, wind energy.

What is Yao Sun's total number of citations?

Yao Sun has 6,352 citations in total.

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