低功耗防孤岛保护测试装置控制技术的研究

发布时间：2018-03-26 12:13

本文选题：低功耗　切入点：防孤岛保护测试装置　出处：《邵阳学院》2015年硕士论文

【摘要】：论文以检测并网逆变器防孤岛保护功能为目标,对防孤岛保护测试装置的拓扑结构和控制技术进行了研究。论文研制的低功耗防孤岛保护测试装置在实际应用中具有良好的效果,具有较高的工程应用价值。针对传统防孤岛保护测试装置测试过程中消耗大量电能,并存在体积庞大、需要手动匹配、操作复杂、耗时长等问题,论文提出以基于LC滤波器的电压型PWM(脉冲宽度调制)AC/DC/AC变换器作为低功耗防孤岛保护测试装置的主电路拓扑结构。该拓扑由负载模拟变换器和并网变换器组成,负载模拟变换器模拟孤岛负载,并网变换器向电网回馈测试电能实现低功耗。对低功耗防孤岛保护测试装置的控制技术进行了研究。针对两相静止αβ坐标系下的数学模型,论文提出了负载模拟变换器的重复PI控制策略。其中,重复控制保证了负载模拟变换器的稳态精度,PI控制提供了良好的动态响应。针对并网变换器,论文提出了电流内环PR控制与电压外环PI控制的双闭环控制策略,提高了并网变换器控制系统的稳态性能和抗干扰能力。通过Matlab仿真验证了所提控制策略的有效性。研制了一套50k W的低功耗防孤岛保护测试装置,并对其主电路及其控制系统的软硬件电路进行了详细介绍。通过对同一台光伏逆变器进行防孤岛保护测试实验,与传统RLC测试装置相比较,分析对比实验数据,得出利用低功耗防孤岛保护测试装置进行防孤岛保护测试实验与传统RLC负载效果一致,证明了论文提出的主电路拓扑和控制技术的有效性。
[Abstract]:The purpose of this paper is to detect the islanding protection function of grid-connected inverter. The topology structure and control technology of the anti-islanding protection test device are studied in this paper. The low power anti-islanding protection test device developed in this paper has a good effect in practical application. It has high engineering application value. In view of the problems such as large volume, manual matching, complicated operation, long time consuming and so on, the traditional anti-insular protection test device consumes a lot of electric energy in the testing process. This paper presents the main circuit topology of AC / DC / AC converter based on LC filter, which is composed of load analog converter and grid-connected converter. The load analog converter simulates the isolated island load, and the grid-connected converter gives feedback to the grid to test the electric energy to achieve low power consumption. The control technology of the low-power anti-islanding protection testing device is studied. The mathematical model of the two-phase static 伪尾 coordinate system is studied. The repetitive Pi control strategy of the load analog converter is proposed in this paper. The repetitive control provides a good dynamic response to the steady state precision of the load analog converter. In this paper, a double closed loop control strategy for current inner loop PR control and voltage outer loop Pi control is proposed. The steady-state performance and anti-jamming ability of grid-connected converter control system are improved. The effectiveness of the proposed control strategy is verified by Matlab simulation. A 50kW low-power anti-islanding protection test device is developed. The hardware and software circuits of its main circuit and its control system are introduced in detail. The test data of the same photovoltaic inverter are analyzed and compared with the traditional RLC test device through the test of anti-islanding protection of the same photovoltaic inverter. It is concluded that the test results of anti-islanding protection by using low-power anti-islanding protection test device are consistent with the traditional RLC load, and the effectiveness of the main circuit topology and control technology proposed in this paper is proved.
【学位授予单位】：邵阳学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM46

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