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2016 IEEE 8th International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia)最新文献

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A model predictive current control method of PMSM based on the simultaneous optimization of voltage vector and duty cycle 一种基于电压矢量和占空比同步优化的PMSM模型预测电流控制方法
Yanping Xu, Baocheng Zhang, Qin Zhou
In the traditional duty cycle model predictive current control (MPCC), there are still large current ripples because voltage vector and duty cycle is optimized separately, which cannot ensure the applied voltage vector is global optimization. An MPCC method of permanent magnet synchronous motor (PMSM) based on the simultaneous optimization of voltage vector and duty cycle is proposed in this paper. In the proposed MPCC method, the duration of every active-vector is calculated based on the principle of deadbeat q-axis current control firstly. Then, both voltage vector and voltage vector duration are optimized simultaneously in the cost function. Simulation results show that, compared to the traditional duty cycle MPCC, the proposed MPCC method achieve lower current ripples and less current harmonics.
在传统的占空比模型预测电流控制(MPCC)中,由于电压矢量和占空比分别优化,无法保证施加的电压矢量是全局优化的,因此仍然存在较大的电流纹波。本文提出了一种基于电压矢量和占空比同步优化的永磁同步电动机MPCC方法。在该方法中,首先基于无差拍q轴电流控制原理计算各有源矢量的持续时间。然后,在代价函数中同时优化电压矢量和电压矢量持续时间。仿真结果表明,与传统占空比MPCC相比,该方法实现了更小的电流纹波和更小的电流谐波。
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引用次数: 17
Study on smooth-transforming feed-forward control strategy of the inverter in double operation modes 双工作模式下逆变器平滑变换前馈控制策略研究
Jinyan Zheng, Yu Fang, Pan Xu, Songyin Cao, Yong Xie, P. Wheeler
In this paper, a feed-forward control strategy of the inverter, in which the double operation mode including stand-alone operation and grid-connected operation can be smoothly switched, is proposed. When the inverter is operated under the current-mode grid-connected power generation, the feed-forward control of grid voltage is employed, which can improve the dynamic performance of the inverter and suppress the current impacting to the grid. And when the inverter is in the voltage-mode stand-alone operation, the feed-forward control of off-grid voltage reference is adopted to reduce the switching delay and to restrain the impact of the electricity. With the synchronous switching of the mode switch and the selection switch to select the corresponding feed-forward, the switching of the inverter at any time in double operation modes can be easily realized. Experiments show that the method of feed-forward control in this paper can realize the smooth switching of the inverter in the double operation mode of stand-alone operation and grid-connected operation.
本文提出了一种能够平稳切换单机和并网双运行模式的逆变器前馈控制策略。当逆变器工作在电流型并网发电时,采用电网电压前馈控制,可以改善逆变器的动态性能,抑制电流对电网的冲击。当逆变器处于电压模式单机运行时,采用离网基准电压前馈控制,减少开关延时,抑制电力的影响。通过同步切换模式开关和选择开关选择相应的前馈,可以方便地实现逆变器在双工作模式下的随时切换。实验表明,本文提出的前馈控制方法可以实现逆变器在单机运行和并网运行双运行模式下的平稳切换。
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引用次数: 0
Research on voltage and switching balance control for cascaded power electronic transformer under hybrid PWM modulation 混合PWM调制下级联电力电子变压器电压及开关平衡控制研究
Yuwei Sun, Jiaomin Liu, Yonggang Li, Chao Fu, Hui Wang
A voltage and switching balance control method for cascaded power electronic transformer under hybrid PWM modulation is investigated in this paper. By using switch function rotation strategy among sub-modules as well as a switching allocation scheme between bridge arms to equalize the power and switching distribution, the method is developed. In addition, a voltage feedback-feedforward-based controller for IBDC converters is utilized to further ensure the dc-link voltages are balanced, in case of slight difference of series modules. By utilizing the proposed control method, the properties of the subject investigated including voltage and switching balance, low THD, unity power factor, and reduced switch frequency, are satisfactory. And the validity of the design is verified by the simulation and experimental results.
研究了混合PWM调制下的级联电力电子变压器电压开关平衡控制方法。采用子模块间的开关函数旋转策略和桥臂间的开关分配方案来均衡功率和开关分配。此外,IBDC变换器采用了电压反馈-前馈控制器,进一步保证了在串联模块略有差异的情况下,直流链路电压的平衡。采用所提出的控制方法,所研究的课题具有电压和开关平衡、低THD、统一功率因数和降低开关频率等令人满意的特性。仿真和实验结果验证了设计的有效性。
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引用次数: 5
An improved droop control strategy of energy storage system for unbalanced load in micro-grid 微电网不平衡负荷下储能系统下垂控制的改进策略
Jinhang Hu, Qiong Tao, Bingyu Sang, Pingliang Zeng, Yu Zhang
In micro-grid system, voltage and current can become unbalanced due to unbalanced load, causing power quality and operation security problem. In this paper, an improved droop control strategy based on three-phase independent control is proposed. In this method, the independent droop control curve of each phase is formed by considering three-phase active power, reactive power and voltage respectively. The influence of unbalanced impedance parameters of energy storage system can be eliminated by fine-tuning each independent droop coefficient. The voltage and current imbalance can be solved by adjusting the secondary regulation value of each phase independently. A simulation model and experimental system are set up to verify the feasibility of the algorithm. The results show that the control strategy can improve the power quality of micro-grid with good stability in the unbalanced three-phase system.
在微电网系统中,负载不平衡会导致电压和电流不平衡,从而导致电能质量和运行安全问题。本文提出了一种基于三相独立控制的改进下垂控制策略。该方法分别考虑三相有功功率、无功功率和电压,形成各相独立的下垂控制曲线。通过对各独立下垂系数的微调,可以消除储能系统阻抗参数不平衡的影响。通过单独调节各相的二次调节值,可以解决电压电流不平衡的问题。建立了仿真模型和实验系统,验证了该算法的可行性。结果表明,该控制策略能够提高微电网的电能质量,在三相不平衡系统中具有良好的稳定性。
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引用次数: 1
The harmonic analysis and suppression methods for photovoltaic grid system based on improved LCL filter 基于改进LCL滤波器的光伏电网系统谐波分析与抑制方法
Wenjin Wu, Jianhui Su, Yong Shi, Haining Wang, Du Yan
For the resonance phenomenon in LCL filter interconnection interface of photovoltaic grid system, the mechanism of the interconnection node voltage resonance and the reason for resonance frequency changing are analyzed. In this paper, a control method based on virtual harmonic impedance is proposed. The virtual harmonic impedance is composed of virtual resistance and virtual inductance. It shows the characteristic of resistance and inductance in low frequency band and has good effect of harmonic suppression. It shows the resistance characteristics in high frequency band and suppresses the harmonic amplification. A improved LCL filter is designed based on virtual harmonic impedance control method. The improved method is LC resonance branch paralleled on damping branch and provides low resistance pathway for the harmonic current near carrier frequency. The filtering effect is strengthened and the method reduces power loss of the damping resistor. Finally the simulation experiments show the effectiveness of the proposed method.
针对光伏电网系统LCL滤波器互联界面的谐振现象,分析了互联节点电压谐振的机理和谐振频率变化的原因。本文提出了一种基于虚拟谐波阻抗的控制方法。虚谐波阻抗由虚电阻和虚电感组成。它在低频段表现出电阻和电感的特性,具有良好的谐波抑制效果。它显示了高频电阻特性,抑制了谐波放大。基于虚拟谐波阻抗控制方法,设计了一种改进的LCL滤波器。改进后的方法是在阻尼支路上并联LC谐振支路,为载频附近的谐波电流提供低阻通道。该方法增强了滤波效果,降低了阻尼电阻的功率损耗。最后通过仿真实验验证了该方法的有效性。
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引用次数: 0
Research on control method of T-type three-level topology t型三层拓扑控制方法研究
Bo Peng, Guorong Zhang
A T-type three-level inverter topology is studied in this paper, and a control method based on the topology is presented. For T-type topology, according to the polarity of the load current, the method take a correspondingly control to the switch state of zero level to output the reference voltage, which reduce the switch loss. To solve the problem of neutral-point potential balance, neutral-point charge adjustment algorithm is introduced, which effectively suppress neutral point voltage drift. Finally, T-type three-level model is built under environment of MATLAB and the results of simulation verify the feasibility and effectiveness of the control method.
本文研究了一种t型三电平逆变器的拓扑结构,提出了一种基于该拓扑结构的控制方法。对于t型拓扑,该方法根据负载电流的极性,对零电平的开关状态进行相应的控制,输出参考电压,降低了开关损耗。为了解决中性点电位平衡问题,引入了中性点电荷调整算法,有效地抑制了中性点电压漂移。最后,在MATLAB环境下建立了t型三层模型,仿真结果验证了控制方法的可行性和有效性。
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引用次数: 5
The bidding transaction model of the hour-ahead regulation service market with energy storage system concerned 考虑储能系统的小时前调节服务市场竞价交易模型
Wenqian Yin, Haoming Liu, Bo Yang, Ye Jilei, J. Xue
As the deregulation of electricity market, in addition to grid-connected generators, any other resources capable of providing ancillary service are permitted to participate in the ancillary service market. Energy storage system is of great value due to its quick and accurate response. Regulation service plays an important role in real-time balance. A novel regulation market bidding model is proposed in this paper, with quoted price, regulation performance taken into consideration. Unlike traditional clearing model, up-regulation capacity and down-regulation capacity are differentiated. The regulation performance indices, including accuracy, response time and ramp rate are used to modify the quoted price. Then the clearing model is formulated to minimize the regulation service cost with different regulation requirements satisfied. As for the payments, in reference to two-part payment, on one hand, all the selected regulation resources are paid for the reserve capacity, on the other hand, they can also be paid according to their actual effective power regulation. The numerical example demonstrates that clearing results vary as different regulation performance demands occur. When high quality regulation is needed, high quality resources like energy storage system are of great advantage. It turns out an effective incentive method for resources of good regulation performance like energy storage system to participate in regulation market competition.
随着电力市场的放松管制,除了并网发电机外,任何其他有能力提供辅助服务的资源都可以参与辅助服务市场。储能系统具有快速、准确的响应特性,具有重要的应用价值。监管服务在实时平衡中起着重要的作用。本文提出了一种考虑报价、监管绩效的监管市场竞价模型。与传统的清算模式不同,上调能力和下调能力是有区别的。利用调节性能指标,包括准确性、响应时间和斜坡率来修改报价。在满足不同监管要求的情况下,建立监管服务成本最小化的清算模型。在支付方面,参照两部分支付的方式,一方面对所有选择的调控资源按储备容量支付,另一方面也可以根据其实际有效的电力调节情况支付。数值算例表明,随着调节性能需求的不同,清理结果也不同。当需要高质量的调控时,像储能系统这样的优质资源具有很大的优势。为储能系统等具有良好监管绩效的资源参与监管市场竞争提供了一种有效的激励方法。
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引用次数: 2
Power Talk: A novel power line communication in DC MicroGrid Power Talk:一种新型直流微电网电力线通信
Hongpeng Liu, Yongheng Yang, P. Loh, F. Blaabjerg, Marko Angjelichinoski, Č. Stefanović, P. Popovski
In this paper, a novel communication strategy called Power Talk is introduced to realize the power line communication among the Voltage Source Converters (VSC) of DC MicroGrids (MGs). Each VSC transmits information by changing the control parameters, and receives information by observing the local output power. By using common coding schemes, which transform the DC MGs in some familiar communication channels, some important communication challenges can be addressed, such as random load variations and VSCs switching, as it do not need a separate communication channel. For this purpose, two multiple access strategies are analyzed and the method based on training sequences is presented in this paper. Experiments have been carried out on a MG of two parallel converters. The experimental results presented in this paper are to verify the effectiveness of proposed communication strategy.
为了实现直流微电网中电压源变换器之间的电力线通信,提出了一种新的通信策略——Power Talk。各VSC通过改变控制参数发送信息,通过观察本地输出功率接收信息。通过使用通用编码方案,将直流MGs转换为一些熟悉的通信通道,可以解决一些重要的通信挑战,如随机负载变化和VSCs切换,因为它不需要单独的通信通道。为此,本文分析了两种多址策略,提出了基于训练序列的多址策略。在两个并联变流器的MG上进行了实验。本文的实验结果验证了所提出的通信策略的有效性。
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引用次数: 9
A single-stage LED driver with couple inductor in low input voltage 一种低输入电压下带耦合电感的单级LED驱动器
Tian Liang, Yijie Wang, Yueshi Guan, Dianguo Xu, Wei Wang
A single-stage LED is proposed the paper, the LED driver is made of three parts, the first part is a continuous conduction mode (CCM) boost circuit, which make the circuit have a twice voltage gain; the second part is a double tank LLC circuit, which decreases the peak current and improves the efficiency of the system, and here the couple inductor technique is adopted to increase the power density; the third part is the current balancing circuit, which is used to balance the current of different strings. A 35W prototype is proposed in the laboratory to prove the rightness of the analysis, and the efficiency is as high as 95% in the full load state.
本文提出了一种单级LED, LED驱动器由三部分组成,第一部分是连续导通模式(CCM)升压电路,使电路具有两倍的电压增益;第二部分是双槽LLC电路,该电路降低了峰值电流,提高了系统效率,并采用了耦合电感技术来提高功率密度;第三部分是电流平衡电路,用于平衡不同串的电流。在实验室中提出了35W的样机来验证分析的正确性,在满载状态下效率高达95%。
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引用次数: 1
Research on control strategy of a single-phase inverter with good output voltage quality 输出电压质量好的单相逆变器控制策略研究
Xiangdong Sun, Yong Liu, Biying Ren, Yu Majing
As for the off-grid distributed power generation system, basic working principle of a single-phase inverter composed of the quasi-Z source inverter and the single-phase full-bridge inverter is studied in this paper. In terms of the former Quasi-Z source inverter, direct sample and control method of DC-link peak voltage is discussed. The PWM modulation strategy of the shoot-through duty cycle with no zero state is also analyzed, and make the Quasi-Z source inverter achieve the voltage-boosted function. For the latter single-phase full-bridge inverter, repetitive control and proportional control are combined to control the voltage loop, the THD of output voltage under a nonlinear load may be improved and the inverter has good output voltage quality, in the meanwhile, the quick dynamic response of the system is increased. The experimental results verify that the presented control strategy is valid and feasible.
针对离网分布式发电系统,本文研究了由准z源逆变器和单相全桥逆变器组成的单相逆变器的基本工作原理。针对以往的准z源逆变器,讨论了直流链路峰值电压的直接采样和控制方法。分析了无零状态下透射占空比的PWM调制策略,使准z源逆变器实现升压功能。对于后一种单相全桥逆变器,将重复控制和比例控制相结合来控制电压环,可以提高非线性负载下输出电压的THD,使逆变器具有良好的输出电压质量,同时增加了系统的快速动态响应。实验结果验证了所提控制策略的有效性和可行性。
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引用次数: 3
期刊
2016 IEEE 8th International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia)
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