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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Jiansheng Kong Chunguang Ren Xinwei Wei Yue Qin Dongxin Guo Baifu Zhang Yifan Wang Xuejin Li Guanfei Hao Shanxi Key Lab. of Power System Operation and Control Taiyuan Unversity of Technology Taiyuan China

ISBN: (纸本)9781665434263

Under unbalanced AC microgrid voltage conditions in hybrid microgrids, DC microgrid bus will generate double frequency ripple voltage pulsation, which damages the voltage stability. In order to suppress the double-frequency pulsation, a control strategy suitable for CLLLC DC transformers is proposed in this paper. First, an equivalent model is established by first harmonic approximation to describe the fundamental wave of CLLLC DC transformers. On the basis, its voltage gain characteristics and input impedance characteristics can be analyzed. Then, considering the feature of the input voltage pulsation of the DC transformer under unbalanced voltage conditions, the parameters of the DC transformer are optimized according to the design index. Therefore, a control strategy based on the double frequency ripple voltage pulsation feed-forward is proposed and the PR controller is adopted to effectively suppress the DC bus voltage fluctuation when the input voltage is pulsing. Finally, the proposed voltage feedforward control strategy and parameter optimization de-sign are verified by the Matlab.Simulink results.

关键词： Voltage fluctuations Microgrids Transformers Mathematical models Indexes Impedance Voltage control

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Virtual flux based direct power control for three-level PWM rectifier 17

Virtual flux based direct power control for three-level PWM ...

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2014 17th International Conference on Electrical Machines and systems, ICEMS 2014

作者： Yingchao, Zhang Liping, Jin Yongchang, Zhang Ting, Lu Zhengming, Zhao Key Lab. of Special Power Supply of PLA Chongqing Communication Institute China North China University of Technology Power Electronics and Motor Drive Engineering Research Center China State Key Lab. of Control and Simulation of Power System and Generation Equipments Tsinghua University China

ISBN: (纸本)9781479951611

This paper presents a new control strategy for three-level neutral point clamped (NPC) pulse width modulated (PWM) rectifier without power source voltage sensors. The relationship between instantaneous power and voltage vectors is derived mathematically. Virtual flux is estimated and used to calculate the phase of the power source voltage and instantaneous power. On these bases, a direct power control (DPC) scheme for three-level PWM rectifier is presented. An optimal switching table is established, vector switching scheme and balance strategy for the neutral point potential are discussed. Variable switching frequency and dynamic process of the startup are also analyzed. Experimental results have verified the theoretical approach and the three-level PWM rectifier with proposed DPC based on virtual flux exhibits several advantages, such as simple algorithm, low costs and excellent dynamic performance. © 2014 IEEE.

关键词： Electric rectifiers

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Research on the dispatch proportion of battery capacity in photovoltaic primary frequency control 3

Research on the dispatch proportion of battery capacity in p...

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3rd IEEE Conference on Energy Internet and Energy system Integration, EI2 2019

作者： Han, Zhijun Luo, Gang Song, Xinrui Yang, Caiming Zhang, Lizong Jia, Yanbing Zhao, Zhou Jin, Yuanwen State Grid Zhejiang Power Co. Ltd. Hangzhou China State Grid Shaoxing Power Supply Company Shaoxing China Taiyuan University of Technology Shanxi Key Lab. of Power System Operation and Control Taiyuan China Shaoxing Jianyuan Power Group Co. Ltd. Shaoxing China

ISBN: (纸本)9781728131375

It is an inevitable problem of frequency control with the increasing capacity of PV connected into large-scale grid. In order to resolve the problem of the contradiction between the increasing demand and dressing supply capacity of frequency control, the requirement of relevant technical for PV to take part in primary frequency control is put forward. The battery-assisted frequency control system is introduced, and the primary frequency control effect can be improved by using its fast response characteristic. In this paper, the ratio of battery output to all power output is used to analyze the primary frequency control gain of the battery participating in the frequency control of the PV plant. The simulation results show that the larger proportion of energy storage system output can bring better frequency control capacity, reduce frequency fluctuations and improve system stability. © 2019 IEEE.

关键词： system stability

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Regional optimal scheduling of distribution network based on soft open point

Regional optimal scheduling of distribution network based on...

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International Conference on power Electronics and Motion control (IPEMC)

作者： Jiamei Zhang Kai Sun State Key Lab of Power System Operation and Control Tsinghua University Beijing

ISBN: (数字)9798350351330

ISBN: (纸本)9798350351347

The proliferation of distributed photovoltaics and electric vehicles in distribution network (DN) has led to differentiation of the same region, which may result in voltage exceeding the limits and unbalanced branch flow. At the same time, soft open point (SOP) is replacing traditional interconnect switches with greater flexibility and controllab.lity. This paper proposes a SOP based regional balanced optimization scheduling method for distribution networks. In the optimal model, the distribution network division method is proposed based on the sensitivity analysis and system general controllab.e capability index. An optimization model is constructed to minimize the operation costs within the region while the voltage is within the safe range based on the active and reactive power control of SOPs. The nonlinear factors are converted into linearized based on piecewise linearization and second-order cone optimization methods. The superiority of the proposed method is proved through comparative case analysis.

关键词： Photovoltaic systems Reactive power control Sensitivity analysis Distribution networks Optimal scheduling Electric vehicles power electronics

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An Advanced control Strategy for Bidirectional Isolated Three Phase AC/DC Dual-Active-Bridge Converter in Hybrid Microgrid 5

An Advanced Control Strategy for Bidirectional Isolated Thre...

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5th IEEE Conference on Energy Internet and Energy system Integration, EI2 2021

作者： Guo, Dongxin Wang, Panbao Kong, Jiansheng Tian, Jinjie Ren, Chunguang Meng, Xiangqi Jia, Yanbing Qin, Yue Wang, Zeqi Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China Department of Electrical Engineering Harbin Institute ofTechnology Harbin China Datong Power Supply Company State Grid Shanxi Electric Power Company Datong China School of Electrical and Power Engineering Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434256

This paper proposes an advanced control strategy consisting of current stress optimization based on triple-phase-shifting (TPS) modulation for front-end DAB converter and 33% PWM method for back-end three-phase full bridge inverter. Compared with the traditional phase shift control, the control strategy proposed for the front-end DAB converter achieves linear control and significantly reduces current stress. In addition, it reduces the DC-Link capacitance, which improves the safety of the equipment. The 33% modulation method adopted by the full bridge inverter at the back-end reduces the switching loss of semiconductor devices. The principle, derivation and realization of the proposed control strategy are described in detail. Simulation results are presented to validate the effectiveness of the proposed strategy. © 2021 IEEE

关键词： Pulse width modulation

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Flow transferring identification algorithm for multi-branches removal event with consideration of transient phenomena

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2007年第16期27卷 24-30页

作者： Xu, Hui-Ming Bi, Tian-Shu Huang, Shao-Feng Yang, Qi-Xun Key Lab. of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

Cascading trips caused by flow transferring are the crucial causation of a lot of well-known blackouts. It severely threatens the security and reliability of power systems. Flow transferring relativity factor (FTRF) is extended from single branch removal event to multi-branches removal event. According to refraction and reflection process of flow transferring, the calculation formula of FTRF for multi-branches chain removal event is deduced. Moreover, by using the relationship of node injection currents and branch currents, a method of post-fault branch current estimation and a flow transferring identification algorithm based on WAMS to distinguish flow transferring in transient period is presented. The simulation results of 10-generator 39-bus New England system show that the proposed estimation method and the identification algorithm work well.

关键词： Electric power systems

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Multi-swing stability assessment approach based on variation rate of transient energy for power systems

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2007年第16期27卷 13-18页

作者： Song, Fang-Fang Bi, Tian-Shu Yang, Qi-Xun Key Lab. of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

The lack of quantitative stability analysis software for power system is one of the main reasons for losing good chance to implement the emergency control and even finally resulting in the large outage. Recently, the rapidly developing wide area measurement system (WAMS) gives a new way for quick on-line quantitative transient stability assessment. Starting with the single machine energy function, the relationship between the variation rate of transient unbalance energy and multi-swing stability was analyzed in detail, and the corresponding characteristic of the variation rate of transient energy was proved. Then, a new multi-swing stability assessment criterion based on WAMS was proposed. Numerical simulations were conducted on 6-machine 22-bus system of China electric power research institute to demonstrate the effectiveness of this criterion.

关键词： Electric power systems

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An Application of Auxiliary operation of power Dispatching based on Semantic Analysis 12

An Application of Auxiliary Operation of Power Dispatching b...

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12th IEEE PES Asia-Pacific power and Energy Engineering Conference, APPEEC 2020

作者： Zhang, Tao Li, Hao Lu, Jixiang Jun, Lu Jin Li, Hong Xie, Feng Technology Research Center Nari Group Corporation Nanjing China State Key Lab. of Intelligent Power Grid Protection and Operation Control Nari Group Corporation Technology Research Center Nanjing China

ISBN: (数字)9781728157481

ISBN: (纸本)9781728157481

power dispatching plays quite an important role in power grid operation in terms of safety and stability. Structured data has been well managed in the real-time power dispatching and controlling system. However, the management of unstructured data such as text data has not received enough attention. In this paper, we accomplish an application of auxiliary operation of power dispatching by doing semantic analysis on operation procedures, which belong to an important category of power dispatching text data for fault disposal. The method that we proposed in our application is achieved based on Natural Language Processing (NLP) technologies. Our contributions are mainly two-fold: 1) we accurately extract key information from text data through our proposed method, and 2) we help power dispatching operators reduce their work and improve efficiency by providing auxiliary operation advice. © 2020 IEEE.

关键词： Semantics

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A Stochastic Resource Management Scheme for Multi-Energy Group control system 3

A Stochastic Resource Management Scheme for Multi-Energy Gro...

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3rd IEEE International Conference on power, Electronics and Computer Applications, ICPECA 2023

作者： Ding, Ran Sun, Rongfu Geng, Yan Yao, Yiming Zhao, Ergang Xu, Lina State Grid Jibei Electric Power Company Limited Beijing China Tsinghua University State Key Lab. of Control and Simulation of Power System and Generation Equipment Dept. of Electrical Engineering Beijing China

ISBN: (纸本)9781665472784

The interaction between various energy supply systems (cold, heat, electricity, gas, etc.) is becoming more tightly coupled as social economy and technology advance. Multi-energy systems are ineffective because different types of energy systems run independently. In order to protect the data privacy of each sub-system, this research suggests an ideal resource management framework for a multi-energy group control system. The energy hub (EH) paradigm is first suggested. When deploying EHs, the physical constraints of various energy systems are taken into account. Through scenario-based stochastic programming, the uncertainties of renewable energy are considered. According to the leader-follower relationship between multi-energy group control system operators and energy hub operators (EHOs), Benders decomposition is applied to decentralize the decision-making process. Finally, an example is given to illustrate the effectiveness of the proposed model and algorithm. © 2023 IEEE.

关键词： Data privacy

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Optimization of CRM Totem Pole PFC Based on Inductor Current Zero-Crossing Prediction Strategy

Optimization of CRM Totem Pole PFC Based on Inductor Current...

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IEEE International Conference on power and Energy Applications (ICPEA)

作者： Xin Liu Chunguang Ren Shanxi Key Lab of Power System Operation and Control Taiyuan University of Technology Taiyuan China

ISBN: (数字)9798350356113

ISBN: (纸本)9798350356120

The totem-pole bridgeless PFC circuit based on GaN devices is currently a research hotspot. To achieve full-range ZVS (Zero Voltage Switching), it is necessary to select a reasonable ZCD (Zero Current Detection) sampling scheme and dead time for the inductor current in CRM (Critical Conduction Mode). Addressing the issues of large computational burden and poor reliability in current inductor current zero-crossing prediction strategies, this paper proposes optimizing the turn-off time of the freewheeling diode and the adaptive dead time to improve the reliability of inductor current zero-crossing prediction and the realization of full-range ZVS. Finally, leveraging the powerful computational capability of a high-performance DSP, the proposed method was validated through reasonable software design and the establishment of an experimental platform.

关键词： Software design Zero voltage switching Software reliability Inductors Optimization

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