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62 results on '"Fang, Tianzhi"'

1. Droop Control Strategy Without Interconnection Lines for Input-Parallel Output-Series Grid-Connected Inverter System

Author

Liu, Hao, Fang, Tianzhi, Lin, Zhiheng, Wang, Peng, Huang, Xinze, and Li, Yunwei

Abstract

The input-parallel output-series (IPOS) grid-connected inverter system is suitable for low input voltage and high output voltage occasions, such as solar energy based distributed power generation systems. This letter explores to select least number of control variables to realize multiple control objectives of IPOS grid-connected inverter system, including good system stability, high power factor, and power balance. Then, to avoid interconnection lines among modules to obtain better disturbance-rejection performance, a droop control strategy without interconnection lines is derived based on the duality of input-parallel output-parallel system. Even if the modules hardware parameters are unmatched, the power balance among the modules can also be ensured by increasing the droop coefficient. Finally, the experimental results based on a two-module IPOS grid-connected inverter prototype and simulation results based on three-modulate system are provided to verify the effectiveness of the proposed method.

Published
2024
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2. Input Voltage Sharing Control Strategy for ISOP Systems Under Extreme Load Conditions

Author

Ruan, Xinbo, Chen, Wu, Fang, Tianzhi, Zhuang, Kai, Zhang, Tao, Yan, Hong, Chen, Wei, Series Editor, Chen, Yongzheng, Series Editor, He, Xiangning, Series Editor, Li, Yongdong, Series Editor, Liu, Jingjun, Series Editor, Luo, An, Series Editor, Ma, Xikui, Series Editor, Ruan, Xinbo, Series Editor, Shen, Kuang, Series Editor, Xu, Dianguo, Series Editor, Xu, Jianping, Series Editor, Xu, Mark Dehong, Series Editor, Zha, Xiaoming, Series Editor, Zhang, Bo, Series Editor, Zhang, Lei, Series Editor, Zhang, Xin, Series Editor, Zhao, Zhengming, Series Editor, Zheng, Qionglin, Series Editor, Zhou, Luowei, Series Editor, Chen, Wu, Fang, Tianzhi, Zhuang, Kai, Zhang, Tao, and Yan, Hong

Published
2019
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3. An Improved Average Current Control Strategy for DC–AC Input-Parallel-Output-Parallel Systems

Author

Ruan, Xinbo, Chen, Wu, Fang, Tianzhi, Zhuang, Kai, Zhang, Tao, Yan, Hong, Chen, Wei, Series Editor, Chen, Yongzheng, Series Editor, He, Xiangning, Series Editor, Li, Yongdong, Series Editor, Liu, Jingjun, Series Editor, Luo, An, Series Editor, Ma, Xikui, Series Editor, Ruan, Xinbo, Series Editor, Shen, Kuang, Series Editor, Xu, Dianguo, Series Editor, Xu, Jianping, Series Editor, Xu, Mark Dehong, Series Editor, Zha, Xiaoming, Series Editor, Zhang, Bo, Series Editor, Zhang, Lei, Series Editor, Zhang, Xin, Series Editor, Zhao, Zhengming, Series Editor, Zheng, Qionglin, Series Editor, Zhou, Luowei, Series Editor, Chen, Wu, Fang, Tianzhi, Zhuang, Kai, Zhang, Tao, and Yan, Hong

Published
2019
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4. A General Control Strategy for DC–DC Series–Parallel Power Conversion Systems

Author

Ruan, Xinbo, Chen, Wu, Fang, Tianzhi, Zhuang, Kai, Zhang, Tao, Yan, Hong, Chen, Wei, Series Editor, Chen, Yongzheng, Series Editor, He, Xiangning, Series Editor, Li, Yongdong, Series Editor, Liu, Jingjun, Series Editor, Luo, An, Series Editor, Ma, Xikui, Series Editor, Ruan, Xinbo, Series Editor, Shen, Kuang, Series Editor, Xu, Dianguo, Series Editor, Xu, Jianping, Series Editor, Xu, Mark Dehong, Series Editor, Zha, Xiaoming, Series Editor, Zhang, Bo, Series Editor, Zhang, Lei, Series Editor, Zhang, Xin, Series Editor, Zhao, Zhengming, Series Editor, Zheng, Qionglin, Series Editor, Zhou, Luowei, Series Editor, Chen, Wu, Fang, Tianzhi, Zhuang, Kai, Zhang, Tao, and Yan, Hong

Published
2019
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5. Compound Balanced Control Strategy for DC–AC Input-Series-Output-Series Systems

Author

Ruan, Xinbo, Chen, Wu, Fang, Tianzhi, Zhuang, Kai, Zhang, Tao, Yan, Hong, Chen, Wei, Series Editor, Chen, Yongzheng, Series Editor, He, Xiangning, Series Editor, Li, Yongdong, Series Editor, Liu, Jingjun, Series Editor, Luo, An, Series Editor, Ma, Xikui, Series Editor, Ruan, Xinbo, Series Editor, Shen, Kuang, Series Editor, Xu, Dianguo, Series Editor, Xu, Jianping, Series Editor, Xu, Mark Dehong, Series Editor, Zha, Xiaoming, Series Editor, Zhang, Bo, Series Editor, Zhang, Lei, Series Editor, Zhang, Xin, Series Editor, Zhao, Zhengming, Series Editor, Zheng, Qionglin, Series Editor, Zhou, Luowei, Series Editor, Chen, Wu, Fang, Tianzhi, Zhuang, Kai, Zhang, Tao, and Yan, Hong

Published
2019
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6. Compound Balanced Control Strategy for DC–AC Input-Series Output-Parallel Systems

Author

Ruan, Xinbo, Chen, Wu, Fang, Tianzhi, Zhuang, Kai, Zhang, Tao, Yan, Hong, Chen, Wei, Series Editor, Chen, Yongzheng, Series Editor, He, Xiangning, Series Editor, Li, Yongdong, Series Editor, Liu, Jingjun, Series Editor, Luo, An, Series Editor, Ma, Xikui, Series Editor, Ruan, Xinbo, Series Editor, Shen, Kuang, Series Editor, Xu, Dianguo, Series Editor, Xu, Jianping, Series Editor, Xu, Mark Dehong, Series Editor, Zha, Xiaoming, Series Editor, Zhang, Bo, Series Editor, Zhang, Lei, Series Editor, Zhang, Xin, Series Editor, Zhao, Zhengming, Series Editor, Zheng, Qionglin, Series Editor, Zhou, Luowei, Series Editor, Chen, Wu, Fang, Tianzhi, Zhuang, Kai, Zhang, Tao, and Yan, Hong

Published
2019
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7. A General Control Strategy for DC–AC Series–Parallel Power Conversion Systems

Author

Ruan, Xinbo, Chen, Wu, Fang, Tianzhi, Zhuang, Kai, Zhang, Tao, Yan, Hong, Chen, Wei, Series Editor, Chen, Yongzheng, Series Editor, He, Xiangning, Series Editor, Li, Yongdong, Series Editor, Liu, Jingjun, Series Editor, Luo, An, Series Editor, Ma, Xikui, Series Editor, Ruan, Xinbo, Series Editor, Shen, Kuang, Series Editor, Xu, Dianguo, Series Editor, Xu, Jianping, Series Editor, Xu, Mark Dehong, Series Editor, Zha, Xiaoming, Series Editor, Zhang, Bo, Series Editor, Zhang, Lei, Series Editor, Zhang, Xin, Series Editor, Zhao, Zhengming, Series Editor, Zheng, Qionglin, Series Editor, Zhou, Luowei, Series Editor, Chen, Wu, Fang, Tianzhi, Zhuang, Kai, Zhang, Tao, and Yan, Hong

Published
2019
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8. Wireless IVS Control Strategies for Input-Series-Connected Systems Based on Positive Output Voltage Gradient Method

Author

Ruan, Xinbo, Chen, Wu, Fang, Tianzhi, Zhuang, Kai, Zhang, Tao, Yan, Hong, Chen, Wei, Series Editor, Chen, Yongzheng, Series Editor, He, Xiangning, Series Editor, Li, Yongdong, Series Editor, Liu, Jingjun, Series Editor, Luo, An, Series Editor, Ma, Xikui, Series Editor, Ruan, Xinbo, Series Editor, Shen, Kuang, Series Editor, Xu, Dianguo, Series Editor, Xu, Jianping, Series Editor, Xu, Mark Dehong, Series Editor, Zha, Xiaoming, Series Editor, Zhang, Bo, Series Editor, Zhang, Lei, Series Editor, Zhang, Xin, Series Editor, Zhao, Zhengming, Series Editor, Zheng, Qionglin, Series Editor, Zhou, Luowei, Series Editor, Chen, Wu, Fang, Tianzhi, Zhuang, Kai, Zhang, Tao, and Yan, Hong

Published
2019
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9. Introduction

Author

Ruan, Xinbo, Chen, Wu, Fang, Tianzhi, Zhuang, Kai, Zhang, Tao, Yan, Hong, Chen, Wei, Series Editor, Chen, Yongzheng, Series Editor, He, Xiangning, Series Editor, Li, Yongdong, Series Editor, Liu, Jingjun, Series Editor, Luo, An, Series Editor, Ma, Xikui, Series Editor, Ruan, Xinbo, Series Editor, Shen, Kuang, Series Editor, Xu, Dianguo, Series Editor, Xu, Jianping, Series Editor, Xu, Mark Dehong, Series Editor, Zha, Xiaoming, Series Editor, Zhang, Bo, Series Editor, Zhang, Lei, Series Editor, Zhang, Xin, Series Editor, Zhao, Zhengming, Series Editor, Zheng, Qionglin, Series Editor, Zhou, Luowei, Series Editor, Chen, Wu, Fang, Tianzhi, Zhuang, Kai, Zhang, Tao, and Yan, Hong

Published
2019
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10. Mathematical Model and Closed-Loop Parameters Design for DC–DC ISOP System

Author

Ruan, Xinbo, Chen, Wu, Fang, Tianzhi, Zhuang, Kai, Zhang, Tao, Yan, Hong, Chen, Wei, Series Editor, Chen, Yongzheng, Series Editor, He, Xiangning, Series Editor, Li, Yongdong, Series Editor, Liu, Jingjun, Series Editor, Luo, An, Series Editor, Ma, Xikui, Series Editor, Ruan, Xinbo, Series Editor, Shen, Kuang, Series Editor, Xu, Dianguo, Series Editor, Xu, Jianping, Series Editor, Xu, Mark Dehong, Series Editor, Zha, Xiaoming, Series Editor, Zhang, Bo, Series Editor, Zhang, Lei, Series Editor, Zhang, Xin, Series Editor, Zhao, Zhengming, Series Editor, Zheng, Qionglin, Series Editor, Zhou, Luowei, Series Editor, Chen, Wu, Fang, Tianzhi, Zhuang, Kai, Zhang, Tao, and Yan, Hong

Published
2019
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14. Introduction

Author

Ruan, Xinbo, primary, Chen, Wu, additional, Fang, Tianzhi, additional, Zhuang, Kai, additional, Zhang, Tao, additional, and Yan, Hong, additional

Published
2018
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22. Robust Technique Using the Optimized Grid Voltage Feedforward to Conquer the Impact Induced by Dual Factors for Grid-Connected Inverter in Weak Grid

Author

Fang, Tianzhi, Liu, Hao, Zhang, Huili, and Liu, Chengyi

Abstract

For grid-connected inverter, phase-locked loop (PLL) is generally adopted to obtain the voltage phase information in order to make the grid current synchronized with the grid voltage. In the meantime, the grid voltage feedforward (GVF) is usually employed to improve the grid current quality. While, both of them may deteriorate the system stability in weak grid. This article focuses on the single-phase LCL-type grid-connected inverter, and aims to put forward the optimizing scheme of dealing with the instability caused by these dual factors. In view of this, the weighted GVF is adopted to make a tradeoff between the system stability and harmonics rejection ability. Because the GVF in weak grid will introduce a grid current branch, the bandwidth of the current loop will be improved, which is conducive to reducing the coupling effect of PLL and the current loop. Therefore, the weighted coefficient will also affect the PLL issue. Considering the limited effect of the weighted coefficient on enhancing the system stability, a voltage feedforward path is further added to improve the output admittance phase. The results show that the inverter with the improved feedforward path can maintain good robustness against the wide grid impedance variation.

Published
2024
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23. Robustness Enhancement of Coping With Dual Factors for Grid-Connected Inverter in Weak Grid Based on Synthesis-Admittance- Phasor Scheme

Author

Fang, Tianzhi, Zhang, Huili, Wu, Hao, and Zhang, Yu

Abstract

For the grid-connected inverter, phase-locked loop is generally adopted to obtain the voltage phase information in order to make the grid current be synchronized with the grid voltage. In the meantime, the grid-voltage-feedforward scheme is usually employed to improve the grid current quality. However, both of these two factors may cause negative impacts on the stability in weak grid. In this article, we focus on the LCL-type grid-connected inverter and aim to investigate the reasons for instability and optimize. In view of the existence of dual unstable factors, a synthesis-admittance-phasor scheme is proposed to analyze the influence mechanism of multiple admittances. And considering the attenuation effect of the bandpass link, the design goal of the bandpass link is determined according to the phase margin requirements, and the design process is further given. The results show that the grid-connected inverter with the optimally designed bandpass link can still work stably even against the wide grid-impedance variation.

Published
2023
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49. Distributed voltage sharing control strategy for input-series-output-series inverters system.

Author

Hengwei Zhu, Fang, Tianzhi, and Ruan, Xinbo

Abstract

This paper explores a configuration for modular inverter system, namely, input-series-output-series (ISOS) connected inverter system, which is suitable for high-input-voltage and high-output-voltage applications. The control objective of this configuration is to realize input voltage sharing and output voltage sharing. On the basis of existing centralized control method, a novel distributed voltage sharing control strategy is proposed. Compared with the centralized control strategy, the distributed control strategy makes each module in the system work independently and fully modularity is achieved. The principle of the control method is elaborated and the experimental results are presented to verify the theoretical analysis. [ABSTRACT FROM PUBLISHER]

Published
2013
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50. Compound control strategy for distributed input-series-output-parallel inverter system.

Author

Jian Wang, Fang, Tianzhi, and Ruan, Xinbo

Abstract

Input-series-output-parallel (ISOP) inverter system is very suitable for high input voltage and high output current power conversion applications. The objective of the system is input voltage sharing (IVS) and output current sharing (OCS). This paper put forward two specific implementations of compound control strategy which can realize IVS and OCS. One of two approaches is IVS control combined with the same inductor current phase angle and the other is IVS control combined with the same inductor current amplitude. In the meanwhile, a new solution dedicated to distributed configuration is proposed to achieve fully modularity and communications among the modules are realized through three buses. The experimental results validate the effectiveness of the above two methods and the distributed configuration. [ABSTRACT FROM PUBLISHER]

Published
2013
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