共查询到20条相似文献,搜索用时 140 毫秒
1.
2.
UPS无互联线并联的一种均流技术方案 总被引:1,自引:0,他引:1
本文针对UPS逆变器无互连线并联系统,结合均流的基本原理提出了均流的一种方案,并通过理论分析和仿真结果与原有PQ法进行了比较.结果表明,该方案在线性负载均流性能良好的情况下,能较好地解决非线性负载的不均流问题. 相似文献
3.
4.
5.
范璟 《计算机测量与控制》2022,30(1):114-119
并联DC-DC升压变换器之间的负载电流分配关系到系统可靠性;针对并联DC-DC升压变换器,提出了一种基于主电流控制的改进下垂方法;该方法利用并联DC-DC升压变换器的算法,根据下垂法的负载调节特性自适应地调整每个变换器的参考电压;与传统的下垂法不同,在所有变换器的内环控制器中使用其中一个并联变换器的电流反馈信号,以避免并联变换器控制回路的时延差异;研究结果显示,该算法保证了负载均流与下垂法的负载调节特性一致,在并联变换器参数失配的情况下对该算法进行了测试,通过Matlab/Simulink仿真验证了该算法的有效性。 相似文献
6.
介绍一种基于DSP的高频链软开关逆变器并联控制系统.该控制系统主电路采用高频链软开关拓扑结构,控制部分采用改进的PQ控制和基于电流分解的无连线并联控制相结合,从而有效的解决在非线性负载时均流效果差的缺陷.仿真波形表明该并联逆变器具有良好的性能. 相似文献
7.
并联机器人基于滑模理论的模糊控制 总被引:2,自引:0,他引:2
根据并联机器人控制的特点,运用一种基于滑模理论的模糊控制方法对它进行控制。这种控制算法简单,具有很强的鲁棒性,还能够保证系统的稳定性。仿真结果表明,它对并联机器人的控制具有良好的效果。 相似文献
8.
9.
10.
提出一种基于SOC的改进电流负荷分配方法,该方法采用均流环、电流环、电压环的三闭环结构,其中,均流控制器的电流基准由理想输出功率和储能单元电池荷电状态(state of charge, SOC)共同决定。搭建了MATLAB/Simulink仿真模型和基于TMS320F28335的并联储能系统半实物仿真平台,对比仿真了不同参数影响下系统的性能。并联储能系统中母线电压能够稳定在理想值,电流负荷能够按SOC合理分配,且各储能单元SOC能够快速收敛到均衡状态,验证了所提改进电流负荷分配方法的可行性和合理性。 相似文献
11.
12.
针对负载为超级电容的并联DC-DC变换器系统,为了在固定时间内实现电流输出均衡目标,提出固定时间分布式协同控制方法.将耦合子系统之间的通信拓扑,利用无向图进行刻画.借助输入输出反馈线性化技术,将并联DC-DC变换器系统的电流均衡控制设计难题转化为固定时间内一阶多智能体系统的一致性跟踪问题.借助符号函数、拉普拉斯矩阵、牵制增益矩阵,基于最近邻原则,设计参数可调的固定时间电流均衡分布式协同控制律.利用李亚谱诺夫函数严格证明整个闭环系统的稳定性,并推导出收敛时间的上界.所提出的固定时间电流均衡分布式协同控制方法,可以克服有限时间协同控制方法对初始状态依赖性强的缺点,同时改善了系统的收敛性.借助仿真,验证了所提出方法的有效性和可行性. 相似文献
13.
Logic and logic-based control 总被引:2,自引:2,他引:0
14.
This paper is concerned with one problem in creating intellectual control systems: methods and design tools of fuzzy logical devices for building modern efficient and reliable control systems in poorly formalized problems and ill-structured problem domains. Flaws of the available microprocessor devices for fuzzy information processing are indicated and alternative design principles of fuzzy logic control systems based on high-speed spatially distributed wave guide optical structures are considered based on an example of an opto-electronic dephaser. High-speed spatially distributed wave guide optical structures are shown as being advantageous for solving the scientific and engineering problems for developing new design methods of fuzzy logical devices with enhanced technical characteristics for implementation of fuzzy logical control. 相似文献
15.
用继电自整定实现模糊PID智能控制 总被引:7,自引:0,他引:7
从提高控制器的智能化水平出发,文中提出了模糊PID自适应控制与继电自整定相结合构成PID双模智能控制器的方法。即用继电自整定法整定出PID控制的初始参数,然后切换到模糊PID自适应控制,完成模糊PID智能控制。将该算法应用于一温控系统中,得到了令人满意的效果。 相似文献
16.
一种软件项目的风险评估模型及应用 总被引:7,自引:1,他引:7
赵冬梅 《计算机工程与应用》2006,42(23):192-194
文章提出了一种软件项目风险评估模型。采用AHP方法与模糊逻辑法相结合的方法进行风险评估,并根据软件项目管理的实际情况对AHP方法与模糊逻辑法进行了改造。最后确定出软件项目各风险的权重。在确定了项目的风险,并做出了评估和排序后,对这些风险采取适当的方法进行有效的风险控制。通过实例分析可知,利用该方法可以方便地求出软件项目风险权重,实验结果符合实际。 相似文献
17.
18.
19.
并联混合动力汽车模糊逻辑控制策略的建模和仿真 总被引:3,自引:1,他引:2
提出了基于模糊逻辑控制扭矩分配策略,建立了各功能组件模型.并利用ADVIS0R2002仿真平台,完成了该模糊逻辑扭矩控制策略和电气辅助控制策略仿真比较.结果表明,本文提出的模糊逻辑控制策略对提高混合动力汽车的动力性和燃油经济性,改善尾气的排放有明显的作用. 相似文献
20.
Kai-Yuan Cai Lei Zhang 《Fuzzy Systems, IEEE Transactions on》2008,16(3):600-614
Different from the dominant view of treating fuzzy reasoning as generalization of classical logical inference, in this paper fuzzy reasoning is treated as a control problem. A new fuzzy reasoning method is proposed that employs an explicit feedback mechanism to improve the robustness of fuzzy reasoning. The fuzzy rule base given a priori serves as a controlled object, and the fuzzy reasoning method serves as the corresponding controller. The fuzzy rule base and the fuzzy reasoning method constitute a control system that may be open loop or closed loop, depending on the underlying reasoning goals/constraints. The fuzzy rule base, the fuzzy reasoning method, and the corresponding reasoning goals/constraints define the three distinct ingredients of fuzzy reasoning. While various existing fuzzy reasoning methods are essentially a static mapping from the universe of single fuzzy premises to the universe of single fuzzy consequences, the new fuzzy reasoning method maps sequences of fuzzy premises to sequences of fuzzy consequences and is a function of the underlying reasoning goals/constraints. The Monte Carlo simulation shows that the new fuzzy reasoning method is much more robust than the optimal fuzzy reasoning method proposed in our previous work. The explicit feedback mechanism embedded in the fuzzy reasoning method does significantly improve the robustness of fuzzy reasoning, which is concerned with the effects of perturbations associated with given fuzzy rule bases and/or fuzzy premises on fuzzy consequences. The work presented in this paper sets a new starting point for various principles of feedback control and optimization to be applied in fuzzy reasoning or logical inference and to explore new forms of reasoning including robust reasoning and adaptive reasoning. It can be also expected that the new fuzzy reasoning method presented in this paper can be used for modeling and control of complex systems and for decision-making under complex environments. 相似文献