APF直流侧电压的控制与软启动研究
发布时间：2018-10-14 11:35
【摘要】：随着社会的发展,各种电力电子设备广泛地应用于工业和日常生活中,给人们带来便利的同时也引入了谐波污染等电能质量问题。有源电力滤波器(Active Power Filter,APF)作为治理谐波的有效手段,能够有效抑制谐波、补偿无功。APF直流侧电压的稳定直接影响到APF的输出谐波能力和功率损耗,另外APF并网启动时直流侧电压会产生较大冲击,对直流侧电容和IGBT产生损害,而此时传统的PI控制等不再适用,故本文对APF直流侧电压稳定控制和软启动进行重点研究。本文主要工作如下:本文首先分析了直流侧电压基准设定值与功率损耗、补偿能力的关系,并针对电网电压波动使直流侧电压基准设定值不能同时兼顾APF的输出谐波能力和功率损耗的问题,提出了直流侧电压基准设定值的优化选取方案,保证了在较低功率损耗的同时仍满足补偿精度要求。其次从能量守恒角度分析了直流侧电压波动的原因,阐明了APF在不同工作状态时直流侧电压波动原理;建立了电压电流双环控制系统和直流侧电压的控制数学模型。在此基础上,研究了直流侧电压的模糊控制方法,给出了模糊控制器设计方法和步骤,并针对目前已有的模糊+PI复合控制的缺点,提出了两种改进型的模糊+PI双通控制方法,具有更好的稳定性能,使直流侧电压在负载突变时波动更小。在理论研究基础上,设计了满足直流侧电压稳定的相关器件参数。针对启动时直流侧电压难以控制的问题,分析了软启动的必要性,研究了外加软启动电阻法;给出了软启动电阻的参数选择方法和切除软启动电阻后的升压控制策略,分析了利用桥臂自身组成Boost电路的软启动法。最后通过仿真和实验对本文提出的直流侧电压控制方法和软启动方法进行了验证。结果表明本文所提改进型模糊+PI控制具有很好的控制效果,有效抑制了负载突变时的直流侧电压波动,同时外加软启动电阻法实现了APF较小冲击的并网目标。
[Abstract]:With the development of society, all kinds of power electronic equipments are widely used in industry and daily life, which bring convenience to people and bring about power quality problems such as harmonic pollution. Active Power filter (Active Power Filter,APF), as an effective means to control harmonics, can effectively suppress harmonics and compensate reactive power. The stability of DC side voltage of APF has a direct impact on the output harmonic capacity and power loss of APF. In addition, the DC side voltage of APF will be greatly impacted when it is connected to the grid, which will damage the DC side capacitance and IGBT, but the traditional PI control is no longer applicable, so this paper focuses on the APF DC side voltage stability control and soft start. The main work of this paper is as follows: firstly, the relationship between DC voltage reference setting value and power loss, compensation ability is analyzed. Aiming at the problem that DC side voltage reference setting value can not take into account the output harmonic ability and power loss of APF due to the voltage fluctuation of the power network, the optimal selection scheme of DC side voltage reference setting value is put forward. At the same time, it can satisfy the requirement of compensation precision. Secondly, the reason of DC side voltage fluctuation is analyzed from the angle of energy conservation, the principle of DC side voltage fluctuation in different working state of APF is expounded, and the control mathematical model of voltage and current double loop control system and DC side voltage is established. On this basis, the fuzzy control method of DC side voltage is studied, the design method and steps of fuzzy controller are given, and the shortcomings of fuzzy PI compound control are pointed out. Two improved fuzzy PI double pass control methods are proposed, which have better stability and make DC side voltage fluctuate less when load changes. On the basis of theoretical research, the related device parameters are designed to meet DC side voltage stability. In view of the difficulty of controlling DC side voltage during startup, the necessity of soft start is analyzed, the method of soft starting resistance is studied, the parameter selection method of soft starting resistance and the boost control strategy after removing soft starting resistance are given. The soft start method of Boost circuit composed of the bridge arm itself is analyzed. Finally, the DC side voltage control method and soft start method proposed in this paper are verified by simulation and experiment. The results show that the improved fuzzy PI control has a good control effect and can effectively restrain the DC side voltage fluctuation when the load changes. Meanwhile, the soft start resistance method is applied to realize the grid-connected target with small impact of APF.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM761
本文编号：2270339
[Abstract]:With the development of society, all kinds of power electronic equipments are widely used in industry and daily life, which bring convenience to people and bring about power quality problems such as harmonic pollution. Active Power filter (Active Power Filter,APF), as an effective means to control harmonics, can effectively suppress harmonics and compensate reactive power. The stability of DC side voltage of APF has a direct impact on the output harmonic capacity and power loss of APF. In addition, the DC side voltage of APF will be greatly impacted when it is connected to the grid, which will damage the DC side capacitance and IGBT, but the traditional PI control is no longer applicable, so this paper focuses on the APF DC side voltage stability control and soft start. The main work of this paper is as follows: firstly, the relationship between DC voltage reference setting value and power loss, compensation ability is analyzed. Aiming at the problem that DC side voltage reference setting value can not take into account the output harmonic ability and power loss of APF due to the voltage fluctuation of the power network, the optimal selection scheme of DC side voltage reference setting value is put forward. At the same time, it can satisfy the requirement of compensation precision. Secondly, the reason of DC side voltage fluctuation is analyzed from the angle of energy conservation, the principle of DC side voltage fluctuation in different working state of APF is expounded, and the control mathematical model of voltage and current double loop control system and DC side voltage is established. On this basis, the fuzzy control method of DC side voltage is studied, the design method and steps of fuzzy controller are given, and the shortcomings of fuzzy PI compound control are pointed out. Two improved fuzzy PI double pass control methods are proposed, which have better stability and make DC side voltage fluctuate less when load changes. On the basis of theoretical research, the related device parameters are designed to meet DC side voltage stability. In view of the difficulty of controlling DC side voltage during startup, the necessity of soft start is analyzed, the method of soft starting resistance is studied, the parameter selection method of soft starting resistance and the boost control strategy after removing soft starting resistance are given. The soft start method of Boost circuit composed of the bridge arm itself is analyzed. Finally, the DC side voltage control method and soft start method proposed in this paper are verified by simulation and experiment. The results show that the improved fuzzy PI control has a good control effect and can effectively restrain the DC side voltage fluctuation when the load changes. Meanwhile, the soft start resistance method is applied to realize the grid-connected target with small impact of APF.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM761
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