| 引用本文: | 王晓宇,张 涛,刘 树,操丰梅,刘志超,杨奇逊.火电厂辅机变频器低电压穿越电源[J].电力自动化设备,2015,35(5): |
| WANG Xiaoyu,ZHANG Tao,LIU Shu,CAO Fengmei,LIU Zhichao,YANG Qixun.Power source with low-voltage ride-through capability for auxiliary equipment inverter of thermal power plant[J].Electric Power Automation Equipment,2015,35(5): |
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| 摘要: |
| 母线电压跌落会引起火电厂变频器低压保护动作，导致火电厂辅机停转，进而致使机组非计划停机。针对该问题，设计了一种基于电力电子器件的无源变频器低电压穿越电源（ILP），其主电路拓扑由基于三重并联交错Boost电路的直流变换电路、高可靠性的旁路通道和控制电源构成，其中，基于三重并联交错Boost的直流变换电路减小了ILP电感电流和电容电压的纹波。根据所设计的拓扑结构，提出了电网电压跌落快速识别方法和装置多元化运行模式。针对装置现场控制参数整定困难、调试周期长的问题，采用了以输出误差二次方为性能指标的单神经元自适应PI控制方法。电磁暂态仿真、现场试验与实际应用表明，所设计的ILP具备良好的动、静态输出特性，可以有效地提高变频器的低电压穿越能力。 |
| 关键词: 火电厂 变频器 低电压穿越 电源 电网电压跌落 单神经元PI 神经网络 |
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| Power source with low-voltage ride-through capability for auxiliary equipment inverter of thermal power plant |
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WANG Xiaoyu1, ZHANG Tao2, LIU Shu2, CAO Fengmei2, LIU Zhichao2, YANG Qixun1,2
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1.State Key Lab of New Energy Power System，North China Electric Power University，Beijing 102206，China;2.Beijing Sifang Automation Co.，Ltd.，Beijing 100085，China
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| Abstract: |
| Since the low-voltage protection of auxiliary equipment inverter may trip the equipment due to bus voltage sag，leading to the unscheduled unit shutdown of thermal power plant，a power source with low-voltage ride-through capability based on the power electronic devices is designed for the passive inverter. Its main circuit consists of an AC-DC converter based on the triple parallel interleaving Boost circuit with reduced inductor current and capacitor voltage ripple，a three-phase AC bypass channel with high reliability and a single-phase AC power source for control. A method of fast grid-voltage-sag detection and multiple operating modes are proposed according to its topology. A strategy of single-neuron adaptive PI control with the square output error as its performance index is adopted to facilitate the control parameter setting and site commissioning. The results of electromagnetic transient simulation，field test and actual application show that，the designed device has better dynamic and static output characteristics and effective low-voltage ride-through capability. |
| Key words: thermal power plant electric inverters low-voltage ride-through electric power supplies to apparatus grid voltage sag single-neuron PI neural networks |
