基于功率下垂的UPS无内联线并联及网络控制逆变器并联研究
发布时间：2018-11-12 09:33
【摘要】：随着信息化技术,新能源技术的不断发展,逆变器并联成为一个重要的研究领域。用户对电源的要求越来越高,用电设备的增多,大功率多机并联成为趋势。因此,实现逆变器的稳定并联运行研究工作显得尤为重要。 本文主要研究了基于PQ下垂的逆变器并联运行策略。根据在线式UPS的运行特点,提出了一种兼顾市电锁相,同时实现无内联线并联的解决方案。为了实现更好的控制效果,在已有网络控制基础上,研究了总线拓扑网络控制多机逆变器并联系统,并对网络控制的数学模型及信号时延进行了深入分析。 首先本文基于UPS的单机控制,提出幅值外环电压内环的控制方法,并通过加入虚拟阻抗改变逆变器的输出阻抗,有利于更好的实现逆变器并联控制。实验结果表明UPS单机在阻性负载和非线性负载的情况下有比较好的稳态动态效果,为UPS无内联线并联奠定了比较好的基础。 无内联线并联P-ω,Q-V下垂方法与市电锁相会同时调节ω量,存在一定矛盾。为了解决逆变器并联且兼顾市电锁相,本文提出基于阻性下垂并跟踪市电锁相的控制方法,实现了在线式UPS无内联线并联。阻性和非线性负载并联实验良好的均流效果验证了方案的正确性。 基于PQ下垂的无内联线并联逆变系统不易实现更高的稳态均流度,且逆变器智能化控制成为趋势。基于电力电子网络控制技术,本文研究了多台三相逆变器并联网络控制,详细分析了网络控制逆变器并联的数学模型,并分析了系统所能接受的最大时延,最后利用网络控制实现了多台逆变器并联运行。实验结果表明采用网络控制策略的逆变器并联输出电流均流度更高,具有良好的稳态动态性能,验证了方案的有效性。
[Abstract]:With the development of information technology and new energy technology, parallel inverter becomes an important research field. The demand of power supply is higher and higher, and the increase of electric equipment, high power and multi-machine parallel connection become the trend. Therefore, it is very important to realize the stable parallel operation of inverter. This paper mainly studies the parallel operation strategy of inverter based on PQ droop. According to the running characteristics of on-line UPS, this paper presents a solution to realize parallel connection without internal wire. In order to achieve better control effect, based on the existing network control, the bus topology network control multi-machine inverter parallel system is studied, and the mathematical model of network control and signal delay are deeply analyzed. Firstly, based on the single machine control of UPS, this paper presents the control method of the voltage inner loop of the amplitude outer loop, and changes the output impedance of the inverter by adding the virtual impedance, which is helpful to realize the parallel control of the inverter better. The experimental results show that the UPS single machine has better steady dynamic effect in the case of resistive load and nonlinear load, which lays a good foundation for the parallel connection of UPS without internal connection. The parallel P- 蠅, Q-V sag method without inner connection can adjust omega at the same time as the electric lock, and there are some contradictions. In order to solve the problem of parallel inverter and power phase lock, this paper presents a control method based on resistive droop and tracking the phase lock, and realizes the parallel connection of on-line UPS without inner connection. The correctness of the scheme is verified by the good current-sharing effect of resistive and nonlinear load parallel experiments. It is difficult to achieve higher steady-state average fluidity of parallel inverter system without internal wire based on PQ droop, and intelligent control of inverter becomes a trend. Based on the power electronic network control technology, this paper studies the parallel network control of several three-phase inverters, analyzes the mathematical model of the parallel network control inverter in detail, and analyzes the maximum time delay that the system can accept. Finally, the parallel operation of several inverters is realized by network control. The experimental results show that the parallel output current of the inverter with network control strategy has higher average current and better steady-state dynamic performance. The effectiveness of the proposed scheme is verified.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464
本文编号：2326729
[Abstract]:With the development of information technology and new energy technology, parallel inverter becomes an important research field. The demand of power supply is higher and higher, and the increase of electric equipment, high power and multi-machine parallel connection become the trend. Therefore, it is very important to realize the stable parallel operation of inverter. This paper mainly studies the parallel operation strategy of inverter based on PQ droop. According to the running characteristics of on-line UPS, this paper presents a solution to realize parallel connection without internal wire. In order to achieve better control effect, based on the existing network control, the bus topology network control multi-machine inverter parallel system is studied, and the mathematical model of network control and signal delay are deeply analyzed. Firstly, based on the single machine control of UPS, this paper presents the control method of the voltage inner loop of the amplitude outer loop, and changes the output impedance of the inverter by adding the virtual impedance, which is helpful to realize the parallel control of the inverter better. The experimental results show that the UPS single machine has better steady dynamic effect in the case of resistive load and nonlinear load, which lays a good foundation for the parallel connection of UPS without internal connection. The parallel P- 蠅, Q-V sag method without inner connection can adjust omega at the same time as the electric lock, and there are some contradictions. In order to solve the problem of parallel inverter and power phase lock, this paper presents a control method based on resistive droop and tracking the phase lock, and realizes the parallel connection of on-line UPS without inner connection. The correctness of the scheme is verified by the good current-sharing effect of resistive and nonlinear load parallel experiments. It is difficult to achieve higher steady-state average fluidity of parallel inverter system without internal wire based on PQ droop, and intelligent control of inverter becomes a trend. Based on the power electronic network control technology, this paper studies the parallel network control of several three-phase inverters, analyzes the mathematical model of the parallel network control inverter in detail, and analyzes the maximum time delay that the system can accept. Finally, the parallel operation of several inverters is realized by network control. The experimental results show that the parallel output current of the inverter with network control strategy has higher average current and better steady-state dynamic performance. The effectiveness of the proposed scheme is verified.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464
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