变频调速系统电压暂降耐受特性测试方法研究
发布时间：2018-12-26 07:24
【摘要】：敏感设备对电压暂降的耐受特性研究是分析电压暂降影响严重性、提出缓解措施的重要基础。本文首先利用能量守恒关系、直流侧动态方程、异步电机动态方程,详细揭示变频调速系统受电压暂降的影响状况,分析了变频调速系统电压暂降耐受特性受接口影响因素(保护阈值、控制策略负荷特性)、负荷侧影响因素(负荷特性)以及源侧影响因素(电压暂降类型、电暂降前/后电压幅值、暂降形状)影响的机理。在机理分析的基础上,为完善并标准化变频调速系统电压暂降耐受特性的测试,根据变频调速系统自身的特点,提出了一套完整而系统的测试方法,并给出了具体的试验方案。测试方法主要包括运行故障判据选择、测试项目的设计、测试平台的搭建、测试步骤等。根据试验方案并结合实验室设备条件对变频调速系统电压暂降耐受特性进行了试验研究,考虑影响因素包括直流低电压保护、过电流保护、转矩、转速、电压暂降类型、暂降起始点、相位跳变、谐波、暂降前/后电压幅值、多重电压暂降等;通过对记录的试验数据进行分析,得到了不同状况下的电压暂降敏感度曲线,验证了机理分析的正确性以及测试方法的有效性。为了准确表征实际设备电压暂降耐受特性的不确定性,本文基于10716组试验数据的分析,提取了变频调速系统的通用敏感度曲线,并进一步细化模糊区域,基于统计结果建立了模糊区域的概率模型。试验结果证明,变频调速系统电压暂降耐受特性测试方法是可行、有效的。本文研究结果可以为变频调速系统标准测试方法以及评估电压暂降对含有变频调速系统的工业流程影响提供必要的依据。
[Abstract]:The study on the tolerance of sensitive equipment to voltage sag is an important basis for analyzing the severity of voltage sag and putting forward mitigation measures. In this paper, the energy conservation relation, the DC side dynamic equation and the asynchronous motor dynamic equation are used to reveal in detail the influence of voltage sag on the variable-frequency speed regulation system. This paper analyzes the influence factors (protection threshold, control strategy load characteristic), load side factor (load characteristic) and source side factor (voltage sag type) on voltage sag tolerance characteristic of frequency conversion system. The mechanism of the effect of voltage amplitude and shape before and after electric swoop. On the basis of mechanism analysis, in order to perfect and standardize the test of voltage sag tolerance characteristics of variable-frequency speed regulating system, a set of complete and systematic test method is put forward according to the characteristics of frequency conversion speed regulating system itself, and the concrete test scheme is given. The test method mainly includes the selection of running fault criterion, the design of test project, the construction of test platform, the test steps and so on. According to the test scheme and combined with the condition of laboratory equipment, the characteristics of voltage sag tolerance of variable-frequency speed regulating system are studied. The influence factors including DC low-voltage protection, over-current protection, torque, speed, voltage sag type are considered. Starting point of sag, phase jump, harmonic, voltage amplitude before / after sag, multiple voltage sag and so on; By analyzing the recorded test data, the sensitivity curves of voltage sag under different conditions are obtained, and the correctness of the mechanism analysis and the validity of the test method are verified. In order to accurately characterize the uncertainty of voltage sag tolerance characteristics of practical equipment, based on the analysis of 10716 sets of test data, the general sensitivity curve of variable-frequency speed regulating system is extracted, and the fuzzy region is further refined. The probability model of fuzzy region is established based on the statistical results. The test results show that the test method of voltage sag tolerance is feasible and effective. The results of this paper can provide the necessary basis for the standard test method of frequency conversion speed regulation system and the evaluation of the influence of voltage sag on the industrial process with frequency conversion speed regulation system.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM714.2
本文编号：2391731
[Abstract]:The study on the tolerance of sensitive equipment to voltage sag is an important basis for analyzing the severity of voltage sag and putting forward mitigation measures. In this paper, the energy conservation relation, the DC side dynamic equation and the asynchronous motor dynamic equation are used to reveal in detail the influence of voltage sag on the variable-frequency speed regulation system. This paper analyzes the influence factors (protection threshold, control strategy load characteristic), load side factor (load characteristic) and source side factor (voltage sag type) on voltage sag tolerance characteristic of frequency conversion system. The mechanism of the effect of voltage amplitude and shape before and after electric swoop. On the basis of mechanism analysis, in order to perfect and standardize the test of voltage sag tolerance characteristics of variable-frequency speed regulating system, a set of complete and systematic test method is put forward according to the characteristics of frequency conversion speed regulating system itself, and the concrete test scheme is given. The test method mainly includes the selection of running fault criterion, the design of test project, the construction of test platform, the test steps and so on. According to the test scheme and combined with the condition of laboratory equipment, the characteristics of voltage sag tolerance of variable-frequency speed regulating system are studied. The influence factors including DC low-voltage protection, over-current protection, torque, speed, voltage sag type are considered. Starting point of sag, phase jump, harmonic, voltage amplitude before / after sag, multiple voltage sag and so on; By analyzing the recorded test data, the sensitivity curves of voltage sag under different conditions are obtained, and the correctness of the mechanism analysis and the validity of the test method are verified. In order to accurately characterize the uncertainty of voltage sag tolerance characteristics of practical equipment, based on the analysis of 10716 sets of test data, the general sensitivity curve of variable-frequency speed regulating system is extracted, and the fuzzy region is further refined. The probability model of fuzzy region is established based on the statistical results. The test results show that the test method of voltage sag tolerance is feasible and effective. The results of this paper can provide the necessary basis for the standard test method of frequency conversion speed regulation system and the evaluation of the influence of voltage sag on the industrial process with frequency conversion speed regulation system.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM714.2
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