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级联H桥SVG直流侧电压均衡控制策略
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作者 叶宗彬 葛程科 邓先明 《实验室研究与探索》 CAS 北大核心 2023年第2期52-56,102,共6页
传统的级联H桥静止无功补偿器相间电压均衡控制策略分析计算较为复杂,且需要调节PI参数,为此提出了一种无需参数调节的相间电压均衡控制策略。只需排序比较大小,通过查表法即可求出待注入的零序分量,简化了相间电压平衡算法;针对相内电... 传统的级联H桥静止无功补偿器相间电压均衡控制策略分析计算较为复杂,且需要调节PI参数,为此提出了一种无需参数调节的相间电压均衡控制策略。只需排序比较大小,通过查表法即可求出待注入的零序分量,简化了相间电压平衡算法;针对相内电压均衡控制策略,基于伏秒平衡控制原理提出了一种H桥模块作用时间直接修正法,与基于时间计算的载波水平移相调制策略相配合,即使在电压不平衡的暂态过程中也能够完全实现与上层控制的解耦,并且这种方法能够容易地扩展到级联度更高的SVG系统中。最后,通过在Simulink仿真平台与实验室条件下搭建的小功率实验平台验证了算法的有效性与可行性。 展开更多
关键词 级联H桥静止无功补偿器 电压均衡控制 载波水平移相调制策略
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气动电磁阀动态特性优化 被引量:7
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作者 郭大勇 司国雷 +1 位作者 陈君辉 王嘉磊 《机床与液压》 北大核心 2023年第20期199-204,共6页
动态特性是衡量电磁阀性能的重要指标,同时也是最难解决的问题之一。通过建立某型号气动电磁阀的AMESim模型并进行动态特性优化仿真研究,分析不同控制方法对其动态特性的影响。通过仿真发现,当采用12 V和24 V单电压控制时,随着控制电压... 动态特性是衡量电磁阀性能的重要指标,同时也是最难解决的问题之一。通过建立某型号气动电磁阀的AMESim模型并进行动态特性优化仿真研究,分析不同控制方法对其动态特性的影响。通过仿真发现,当采用12 V和24 V单电压控制时,随着控制电压的升高,气动电磁阀打开时间缩短,关闭时间延长,达不到提高动态特性的目的;在分析原因后,提出24 V加4 V双电压控制方式,气动电磁阀打开时间和关闭时间均有所降低,但降低幅度不大,效果不明显;在分析本质原因后,提出三电压控制方式,最终气动电磁阀的打开时间由16 ms降低到9 ms,关闭时间由61 ms降低到11 ms,有效提高了气动电磁阀的动态特性。并通过试验验证了仿真的有效性。 展开更多
关键词 气动电磁阀 动态特性 电压控制 电压控制 三电压控制
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Sliding mode control of solid state transformer using a three-level hysteresis function
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作者 刘宝龙 査亚兵 张涛 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第8期2063-2074,共12页
The solid state transformer(SST) can be viewed as an energy router in energy internet. This work presents sliding mode control(SMC) to improve dynamic state and steady state performance of a three-stage(rectifier stag... The solid state transformer(SST) can be viewed as an energy router in energy internet. This work presents sliding mode control(SMC) to improve dynamic state and steady state performance of a three-stage(rectifier stage, isolated stage and inverter stage) SST for energy internet. SMC with three-level hysteresis sliding functions is presented to control the input current of rectifier stage and output voltage of inverter stage to improve the robustness under external disturbance and parametric uncertainties and reduce the switching frequency. A modified feedback linearization technique using isolated stage simplified model is presented to achieve satisfactory regulation of output voltage of the isolated stage. The system is tested for steady state operation, reactive power control, dynamic load change and voltage sag simulations, respectively. The switching model of SST is implemented in Matlab/ Simulink to verify the SST control algorithms. 展开更多
关键词 solid state transformer(SST) energy internet sliding mode control(SMC) feedback linearization three-level hysteresis
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A novel digital control strategy of three-phase shunt active power filter under non-ideal mains voltages 被引量:1
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作者 胡志坤 陈志文 +2 位作者 华长春 王会海 丁家峰 《Journal of Central South University》 SCIE EI CAS 2011年第6期2021-2030,共10页
A novel control strategy for three-phase shunt active power filter (SAPF) was proposed to improve its performance under non-ideal mains voltages. The approach was inspired by our finding that the classic instantaneous... A novel control strategy for three-phase shunt active power filter (SAPF) was proposed to improve its performance under non-ideal mains voltages. The approach was inspired by our finding that the classic instantaneous reactive power theory based algorithm was unsatisfactory in terms of isolating positive sequence fundamental active components exactly under non-ideal mains voltages. So, a modified ip-iq reference current calculation method was presented. With usage of the new method, not only the positive sequence but also the fundamental active current components can be accurately isolated from load current. A deadbeat closed-loop control model is built in order to eliminate both delay error and tracking error between reference voltages and compensation voltages under unbalanced and distorted mains voltages. Computer simulation results show that the proposed strategy is effective with better tracking ability and lower total harmonic distortion (THD). The strategy is also applied to a 10 kV substation with a local electrolysis manganese plant injecting a large amount of harmonics into the power system, and is proved to be more practical and efficient. 展开更多
关键词 non-ideal mains voltage deadbeat control fundamental positive sequence active current shunt active power filter
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