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排序方式: 共有286条查询结果,搜索用时 15 毫秒
1.
针对光伏并网逆变器LCL滤波器的大纹波电流和高频谐波损耗问题,分析了电感之和、电感比值和滤波电容值、谐振频率以及入网电流之间的关系,提出了一种LCL滤波器参数最优设计方法.分析了LCL滤波器的传递特性并建立了谐波等效模型,研究了滤波参数对谐振频率以及并网电流的影响,根据LCL滤波器的设计约束条件和光伏并网逆变器实例设计了一组最优参数,并进行了仿真研究.结果表明,提出的优化方案不仅能够有效抑制开关频率的高频纹波,还能减小电感取值和阻尼损耗. 相似文献
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This paper provides design and experimental validation of robust current controllers for three-phase grid-connected converters. The main objectives here are: (i) to show that a simple polytopic model can be used for designing robust controllers for predominately inductive grids; (ii) to help in the choice of the control design parameter, based on a trade-off between an upper bound of the transient settling times and the control gain sizes. Linear matrix inequality based conditions are used to design the robust control gains with lower numerical complexity than similar conditions on literature. It is shown that small values the radius of pole location lead to better bounds for the transient responses, at the price of higher control gains. Good tracking of references for the grid currents is also illustrated in practice, allowing the closed-loop system to inject active and reactive power into the grid. Simulation and experimental results prove that the system connected to the grid can provide three-phase currents complying with requirements of an important international standard. 相似文献
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LCL滤波的PWM整流器新型控制策略 总被引:5,自引:3,他引:5
为了减少PWM整流器开关频率附近高次谐波的含量,采用三次LCL滤波器。但考虑到LCL滤波器存在谐振问题,如果控制策略不合适会导致系统不稳定,且增大输入电网电流的谐波畸变率,提出基于虚拟电阻思想的控制策略。采用控制算法取代阻尼电阻的作用,增加系统的稳定性。此外对LCL滤波的三相电压型PWM整流器的完全和低频数学模型进行了详细分析,并对控制器的设计提出了理论指导。最后的仿真结果证明所提出的控制策略正确可行。 相似文献
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Abstract—Single-phase microgrids are widely used in residential houses. The energy storage system with grid-interactive inverters in these microgrids should operate in both grid-tied and standalone modes. In this article, proportional resonant controller for the single-phase grid-interactive inverter with LCL-filter is designed and implimented in the both operation modes. Also, a novel seamless transfer strategy based on hysteresis current control is proposed when off-grid transfer operation is needed. With the proposed method, the inverter is able to provide voltage support to the local critical loads during the whole transfer process when the grid fails. For the grid-tied transfer process, a phase difference eliminating method based on inverter frequency regulation is introduced in this article to eliminate the phase difference between the grid voltage and the inverter voltage when the grid recovers. Simulation and experiments are carried out and the results verify the effectiveness of the proposed control method. 相似文献