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Improved autonomous converter control for multi-terminal HVDC networks considering line impedance effect in long-distance interconnections 12

Improved autonomous converter control for multi-terminal HVD...

引用

12th IET International Conference on AC and DC Power Transmission, ACDC 2016

作者： Zheng, Wanning Hu, Jiabing Zhang, Meiqing Miao, Miao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China Qinghai Electric Power Corporation Economic and Technology Research Institute China

ISBN: (纸本)9781785612268

Multi-terminal high voltage direct current (HVDC) networks with long-distance interconnections across the region has extensive demands all over the world, particularly for integrating large-scale renewable generations in China. Autonomous converter control based on voltage-droop strategy, widely accepted in DC Microgrid, is however flawed in multi-terminal HVDC networks with long-distance interconnections. That is because DC line impedance makes converters not be able to accurately reach the active power reference value given by the secondary control. This paper proposes an improved autonomous converter control method to reduce the steady-state error of active power in multiterminal HVDC networks. It first illustrates the real operating condition of each converter with traditional autonomous converter control in a multi-terminal HVDC network, and further investigates the relationship between the error of DC current and the steady-error of active power. Then the effects of DC line impedance and the slope of voltage-droop control on the steady-state error of active power flow is analyzed. Based on the analysis, an improved autonomous converter control method is presented to ensure each converter accurately tracking the reference of DC current point calculated from the active power reference and ideal DC voltage. Comparisons between the traditional and presented methods are studied, and eventually simulation tests in PSCAD verify the availability of the proposed methed.

关键词： Errors

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Research on a novel power control method of distributed generators in the micro grid 8th

Research on a novel power control method of distributed gene...

引用

8th Asia-Pacific Power and Energy engineering Conference, APPEEC 2016

作者： Peng, L. Su, S. Zhang, Z.Y. Lin, X.N. Li, X.S. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China College of Electrical Engineering and New Energy China Three Gorges University Yichang China

ISBN: (纸本)9781138028463

When the Distributed Generators (DG) connect to the large power grid, the stability of the power output and the effects on the grid become quite important. The conventional power control methods show many drawbacks while facing this problem. This paper proposes a nonlinear control method that can control the power output of DG in micro grid. The nonlinear problem is transferred to a normal linear problem by using a specific nonlinear transformation. Through this method, we get final control over the whole nonlinear system. To prove the superiorities of this control method, we simulate examples on the electromagnetic simulating platform PSCAD/EMTDC. © 2016 Taylor & Francis Group, London.

关键词： Power control

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A comprehensive accessibility evaluation method for power network planning 8th

A comprehensive accessibility evaluation method for power ne...

引用

8th Asia-Pacific Power and Energy engineering Conference, APPEEC 2016

作者： Xu, J.Y. Yan, J. Wei, C. Qiao, L. Zhuo, Y.X. Wang, Z.C. Zhou, X. Chen, C. Lin, X.N. State Grid Hubei Economic Research Institute Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781138028463

To evaluate the optimum power network design, traditionally, the decision is made mainly depending on the expert's experience, which is somehow subjective. To solve this problem, an accessibility index based on power flow tracing for network evaluation is proposed, which is able to present the inner connectivity and power transfer ability of a power network. Then, a comprehensive evaluation including traditional short circuit, load flow, N-1, economic calculations, and the accessibility index is conducted on the power grid planning of a high-tech industrial park in China. The effectiveness of the proposed accessibility index is validated and network design comparisons are made from the viewpoint of reliability, accessibility and economy. © 2016 Taylor & Francis Group, London.

关键词： Electric power transmission networks

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Damping Control Design for Pulse Width Modulation Series Compensator Using GrHDP

Damping Control Design for Pulse Width Modulation Series Com...

引用

IEEE Power and Energy Society General Meeting

作者： Lingkang Zeng Wei Yao Yu Shen Jinyu Wen Haibo He Cheng Luo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science & Technology Wuhan 430074 China Department of Electrical Computer and Biomedical Engineering University of Rhode Island Kingston RI 02881 USA Northern Indiana Public Service Company (NIPSCO) Merrillville Indiana 46410 USA

ISBN: (纸本)9781538622131;9781538622124

This paper presents an adaptive damping controller for the pulse width modulation series compensator (PWM-SC) to suppress the low frequency oscillation. The adaptive damping controller is designed by using goal representation heuristic dynamic programming (GrHDP), which can facilitate the mapping relationship between input and output signals and improve the control characteristics significantly compared with the conventional heuristic dynamic programming (HDP). Moreover, the adaptive damping controller does not need the system model and has strong learning ability. Simulations results of IEEE 16-machine 68-bus power system show that the proposed GrHDP damping controller can suppress oscillation quickly and has better damping performance than the conventional lead-lag damping controller and HDP based damping controller under different operating conditions and disturbances.

关键词： Damping Control systems Oscillators Frequency control Circuit faults Pulse width modulation Power systems

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Analysis and control of hybrid modular multilevel converter with scheduled DC voltage reducing in A HVDC system 12

Analysis and control of hybrid modular multilevel converter ...

引用

12th IET International Conference on AC and DC Power Transmission, ACDC 2016

作者： Xu, Kecheng Hu, Jiabing Miao, Miao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of since and Technology Wuhan430074 China Qinghai Electric Power Corporation Economic and Technology Research Institute China

ISBN: (纸本)9781785612268

Modular multilevel converter (MMC)-based high voltage direct current (HVDC) technique has made a great achievement in China, such that three-and five-terminal MMC HVDC systems have been constructed in NanAo and ZhouShan, respectively. Reduced DC voltage operation of HVDC systems under extreme weather conditions is a common practice used in most engineering applications, in particular for the applications using overhead transmission lines. In this paper, the control method of the HVDC systems based on hybrid MMC which is composed of halfbridge sub-modules (HBSMs) and full-bridge sub-modules (FBSMs) under reduced DC voltage is illustrated. Because the system has the ability to continue operating with controllable active power and adjustable reactive power under extreme low DC voltage, the operating region of the system has also been analysed with the consideration of the maximum capacity of the connecting transformer at the AC side, the maximum current-through capability of IGBTs in the converter arms, the limit of the modulation ratio of the converter's output voltage and the capacitor voltage balance in SMs. Finally, a method aims to extend the operation region under a certain DC voltage by injecting circular current into the arms is presented and the feasibility of it is verified in PSCAD/EMTDC.

关键词： Power converters

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An improved calculation method for direct transient stability assessment with detailed generator model 8th

An improved calculation method for direct transient stabilit...

引用

8th Asia-Pacific Power and Energy engineering Conference, APPEEC 2016

作者： Wang, Y. Sun, H.S. Pan, X.J. Xu, Y.P. Xi, J.H. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Central China Branch of State Grid Corporation of China Wuhan China

ISBN: (纸本)9781138028463

In direct methods for transient stability analysis, the system transient energy at the end of the disturbance is compared with critical energy and the difference is used as an indication of stability. The transient energy function with a detailed model is always a tough question for direct method research. When the generator model is represented with its Thevenin equivalent circuit in detail, the expression of the transient energy function is similar to that of the classical model. Theoretical analysis and simulations show that generator equivalent internal impedance has a great influence on the computational results of critical energy. A computational method of the generator equivalent internal impedance is proposed and then an improved calculation method for the direct transient stability assessment with a detailed generator model has been developed. Case studies on a three-machine nine-bus system and Central-China power grid equivalent system are given to verify the effectiveness of the presented method in improving the precision. © 2016 Taylor & Francis Group, London.

关键词： Equivalent circuits

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A method for online relay coordination verification using setting comparison

A method for online relay coordination verification using se...

引用

2016 IEEE PES Asia Pacific Power and Energy engineering Conference, APPEEC 2016

作者： Lin, Zhu Dongyuan, Shi Dept. of Electrical Engineering and Computer Science The University of Tennessee Knoxville United States State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology HUST Wuhan China

ISBN: (纸本)9781509054183

The distance backup relays configured with fixed settings may lose their pre-determined coordination, and even form a significant threat to system security due to the variety of system operation condition. There are many special temporary operation conditions in the developing power grids of China, which may be not anticipated in the offline relay coordination. Therefore, periodical online verification of relay coordination is highly desirable to detect improper or incorrect settings under the current system state. However, the verification method is also required to perform verification correctly and efficiently in large-scale power grids, whose importance is similar to that of equal-area criterion for transient stability analysis, and eigenvalue methodology for low frequency oscillation analysis. A new verification method using setting comparison is presented, which performs verification more conveniently and efficiently than conventional method using reach point comparison. The application in large-scale power grids demonstrates the availability of the proposed method. © 2016 IEEE.

关键词： Electric power transmission networks

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Commutation failure analysis considering direct current dynamics in LCC-HVDC systems 12

Commutation failure analysis considering direct current dyna...

引用

12th IET International Conference on AC and DC Power Transmission, ACDC 2016

作者： Hu, Yaping Lu, Jun Zhou, Huafeng CSG Power Dispatching and Control Center Guangzhou510623 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781785612268

This paper presents the mechanism of LCC-HVDC system's commutation failures arising from ac faults. The theoretical analysis of commutation failure is developed by considering direct current dynamics. On the basis of the theoretical analysis, the impacts of ac fault level and fault occurring time on commutation failure are quantified. Moreover, this paper provides a more precise commutation failure criterion. Compared with the conventional, the proposed criterion reveals the relationship between commutation failure and fault occurring time and proves that commutation failure is not probabilistic events. Eventually, the analytical results are verified by the time-domain simulation based on the CIGRE BENCHMARK model in PSCAD/EMTDC.

关键词： Time domain analysis

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The study on CT saturation caused by the circulating current in the delta-winding of converter transformer and its impact on the protection in HVDC system 12

The study on CT saturation caused by the circulating current...

引用

12th IET International Conference on AC and DC Power Transmission, ACDC 2016

作者： Zhang, Kanjun Qi, Xuanwei Yin, Xianggen Chen, Kun Hu, Wei Zhang, Shiyun State Grid Hubei Electric Power Research Institute Wuhan430077 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9781785612268

In the typical HVDC power system, the current transformers (CTs) between the Y-delta converter transformer and the converter bridge is located in the delta-winding of the transformer. Under such condition, the measuring current of these CTs includes the zero-sequence circulating current of the deltawinding. In the case of the adjacent transformer energization or the fault of AC system, the zero-sequence circulating current in the delta-winding maybe very large containing a great amount of dc component. Thus the CTs will be saturated, resulting in the misoperation of the relevant protection in HVDC system, such as the bridge current differential protection. This sort of misoperation seriously threatens the safe and sound operation of the HVDC power system. In this paper, the misoperation cause is analysed in detail via the PSCAD/EMTDC-based simulation. Based on this, a method is proposed to prevent this sort of misoperation by utilizing the zero-sequence circulating current as the restraint quantity.

关键词： Electric instrument transformers

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The study on sympathetic inrush current of converter transformers in HVDC system and its identification method 12

The study on sympathetic inrush current of converter transfo...

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12th IET International Conference on AC and DC Power Transmission, ACDC 2016

作者： Zhang, Kanjun Qi, Xuanwei Zhang, Shiyun Cao, Wenbin Yang, Fan Yin, Xianggen State Grid Hubei Electric Power Research Institute Wuhan430077 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9781785612268

This paper analyses the mechanism of the sympathetic inrush current of the converter transformer of the HVDC transmission system. The impacting factors of the sympathetic inrush current, including the system impedance, the closing angle and the initial remnant flux of the incoming transformer, and the operating condition of the HVDC system and so on, are analysed utilizing on the PSCAD/EMTDC soft. Based on this, this paper proposed two identification methods for the sympathetic inrush current and the simulation proofs the validity of these methods.

关键词： HVDC power transmission

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