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A stepless-power-reconfigurable converter for a constant current underwater observatory Research Article

Yujia Zang, Yanhu Chen, Canjun Yang, Haoyu Zhang, Zhiyong Duan, Gul Muhammad,yanhuchen@zju.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 12,   Pages 1551-1684 doi: 10.1631/FITEE.2100259

Abstract: The conversion from constant current (CC) to constant voltage (CV) is one of the key technologies of CC systems. A with high stability and high reliability is usually used. Applications, however, are limited by high heat dissipation and low efficiency. In this paper, with an improved shunt regulation method, a novel concept of stepless power reconfiguration (SPR) for the CC/CV module is proposed. In cases with stable or slowly changing load, two modes of CC/CV conversion are proposed to reduce unnecessary power loss of the while being able to retain any operator-preset power margin in the system: (1) the manual SPR (MSPR) method based on single-loop control method; (2) the automatic SPR (ASPR) method based on inner-outer loop control method. The efficiency of the system is analyzed. How to select some key parameters of the system is discussed. Experimental results show that MSPR and ASPR are both effective and practical methods to reduce heat dissipation and improve the efficiency of the CC/CV module, while the high stability of the remains.

Keywords： 恒流/恒压转换；并联稳压器；无级功率重构；水下观测网    

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Development and Experiment Research of the Postprocessor for Parallel Kinematic Machine Tools

Li Tiemin,Ye Peiqing,Wang Jinsong

Strategic Study of CAE 2003, Volume 5, Issue 12,   Pages 80-86

Abstract:

Based on the structure of 6 - TPS parallel kinematic machine tools (PKMTs) with 6 degrees of freedom (DOF), the theory and procedure to generate control data is introduced. On the basis of above analysis, the functions and framework of a postprocessor for this type of machine tools is designed. Some important methods for carrying out the postprocessing of the machine are researched and demonstrated, including inner data transfer protocol by parameterized binary data, interpolating algorithm in Descartes coordinate system, planar and spatial tool radius compensation, preprocessing of cutter location data, and word and syntax check of machining codes. Finally, a real machining experiment on the system mentioned above is introduced. The result shows that it can be successfully used in real manufacturing environment.

Keywords： parallel kinematic machine tools     postprocessing algorithm     postprocessor    

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Study on Semi-active Control of Multi-dim Damping Platform Based on Parallel Mechanism and MR Damper

Zhu Wei,Ma Lüzhong,Chen Xiuxiang,Wu Weiguang,Xie Jun

Strategic Study of CAE 2007, Volume 9, Issue 11,   Pages 63-67

Abstract:

MR damper is analyzed on its mechanical characteristic, and is applied in multi-dimension damping in this paper.  A kind of three-translation parallel mechanism is used as main mechanism of multi-dim damping,  whose position and dynamics formula are deduced.  The input signal of controller is from the result of equation of kinematics,  and LQR is used as the semi-active control arithmetic.  Considering complexity of the dynamics equation in dynamic process,  a way is used in control progress when the mechanism is in a steady state through which the entire flat roof is limited adjacent to an equilibrium position.  The result of emulation confirms that the controller is effective.

Keywords： parallel mechanism     multi-dim damping     MR damper     semi-active control    

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A multi-modular shunt active power filter system and its novel fault-tolerant strategy based on split-phase control and real-time bus communication None

Qun-wei XU, Jin-xiang ZHAN, Long XIAO, Guo-zhu CHEN

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 9,   Pages 1166-1179 doi: 10.1631/FITEE.1601296

Abstract:

We first present a new multi-modular shunt active power filter system suitable for large-capacity compensation. Each module in the system has the same circuit topology, system functionality, and controller design, to achieve coordination control among the modules. The module’s reference signals are obtained by multiplying the total reference signal by the respective distribution coefficient. Next, a novel fault-tolerant approach is proposed based on split-phase control in the a-b-c frame and real-time bus communication. When a phase fault occurs, instead of halting the whole module, the proposed strategy isolates only the faulted bridge arm, and then recalculates the distribution coefficients and transfers the compensation capacity to the same phases of the other normal modules, resulting in a continuous operation of the faulted module and optimization of the remaining usable power devices. Through steady-state analysis of the post-fault circuit, the system stability and control reliability are proven to be high enough to guarantee its engineering application value. Finally, a prototype is established and experimental results show the validity and feasibility of the proposed multi-modular system and its fault-tolerant control strategy.

Keywords： Shunt active power filter     Fault-tolerant topology     Split-phase control     Bus communication    

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Active Control of Ocean Vehicle Multidimension Vibration and Motion

Chen Xiuxiang,Ma Lüzhong,Wu Weiguang,Zhu Wei

Strategic Study of CAE 2007, Volume 9, Issue 8,   Pages 52-56

Abstract:

Active control multi-dimension vibration device based on parallel mechanisms and electromagnetic actuator is used to realize the multidimensional low-frequency vibration damping of the shipping under sail.  With the vibration control device,  structural design, system control model analysis and control algorithm research,  as well as prototyping testing are carried out.  The results of prototyping testing indicate that with the active control multi-dimension vibration damping the multi-dimensional low-frequency vibration active controled of shipping under sail can be achieved.

Keywords： electromagnetic actuator     active control     multi-dimension vibration     parallel mechanisms    

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Research of an Interleaved Low-Voltage/High-Current DC-DC Converter

Wang Ping,Sun Xu,Song Liangyu

Strategic Study of CAE 2005, Volume 7, Issue 4,   Pages 59-63

Abstract:

In the recent years, the operating voltages of most high-performance microprocessors were lower than that of the previous ones and the research of low-voltage/high-current DC-DC converter was enhanced. Among all topologies, the current-doublers topology is optional. In the current-doublers topology, the ripple current of the output filter capacitor is reduced because the ripple current of the two inductors partially cancel each other and the required value of the filter inductance is significantly decreased. To further decrease the ripple current of output filter capacitor, this paper introduce a new method that a few of current-doublers are interleaved. This paper gives the switch signal waveforms and simulation model of the circuit. PSpice is used, which is a simulation tool for electronic system. The result of simulation achieves the ideal effect. Finally, the design is tested by an experiment.

Keywords： low-voltage/high-current DC-DC converter     current-doublers     interleaved    

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Research and Development in the Field of Parallel Kinematic Machines

Wang Jinsong,Li Tiemin,Duan Guanghong

Strategic Study of CAE 2002, Volume 4, Issue 6,   Pages 63-70

Abstract:

Parallel kinematic machines are in the process of industrialization. In this paper, research and development of parallel kinematic machines is investigated from various aspects including machine structures, application fields, drive principles and controllers. Some important research projects are introduced. Several key techniques and possible development directions are put forward.

Keywords： parallel manipulator     parallel kinematic machines(PKM)     drive     control system    

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A new variable-mode control strategy for LLC resonant converters operating in a wide input voltage range Article

Hui-pin LIN,Xiao-guang JIN,Liang XIE,Jin HU,Zheng-yu LU

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 3,   Pages 410-422 doi: 10.1631/FITEE.1600029

Abstract: This paper proposes a new variable-mode control strategy that is applicable for LLC resonant converters operating in a wide input voltage range. This control strategy incorporates advantages from full-bridge LLC resonant converters, half-bridge LLC resonant converters, variable-frequency control mode, and phase-shift control mode. Under this control strategy, different input voltages determine the different operating modes of the circuit. When the input voltage is very low, it works in a full-bridge circuit and variable frequency mode (FB_VF mode). When the input voltage rises to a certain level, it shifts to a full-bridge circuit and phase-shifting control mode (FB_PS mode). When the input voltage further increases, it shifts into a half-bridge circuit and variable frequency mode (HB_VF mode). Such shifts are enabled by the digital signal processor (DSP), which means that no auxiliary circuit is needed, just a modification of the software. From light load to heavy load, the primary MOSFET for the LLC resonant converter can realize zero-voltage switching (ZVS), and the secondary rectifier diode can realize zero-current switching (ZCS). With an LLC resonant converter prototype with a 300 W rated power and a 450 V output voltage, as well as a resonant converter with 20–120 V input voltage, the experiments verified the proposed control strategy. Experimental results showed that under this control strategy, the maximum converter efficiency reaches 95.7% and the range of the input voltage expands threefold.

Keywords： LLC     Full bridge     Half bridge     Variable frequency     Phase shift     Wide input voltage range    

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Posture control of a 3-RPS pneumatic parallel platform with parameter initialization and an adaptive robustmethod Article

Guo-liang TAO,Ce SHANG,De-yuan MENG,Chao-chao ZHOU

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 3,   Pages 303-316 doi: 10.1631/FITEE.1500353

Abstract: A control algorithm for a 3-RPS parallel platform driven by pneumatic cylinders is discussed. All cylinders are controlled by proportional directional valves while the kinematic and dynamic properties of the system are modeled. The method of adaptive robust control is applied to the controller using a back-stepping approach and online parameter estimation. To compensate for the uncertainty and the influence caused by estimations, a fast dynamic compensator is integrated in the controller design. To prevent any influence caused by the load applied to the moving platform changing in a practical working situation, the identification of parameters is taken as the initialization of unknown parameters in the controller, which can improve the adaptability of the algorithm. Using these methods, the response rate of the parameter estimation and control performance were improved significantly. The adverse effects of load and restriction forces were eliminated by the initialization and online estimation. Experiments under different situations illustrated the effectiveness of the adaptive robust controller with parameter initialization, approaching average tracking errors of less than 1%.

Keywords： Parameter initialization     Adaptive robust control     Parallel mechanism     Pneumatic cylinders    

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Analysis of Characteristics and CMAC Neural Networks Controller of Electrohydraulic Servo System of the 6-DOF Paralle Platform

Zhai Chuanrun,ZhanXingqun,Zhang Yanhua,Ran Xianglai,Zhao Keding

Strategic Study of CAE 2001, Volume 3, Issue 10,   Pages 36-40

Abstract:

This paper analyzed the kinematics and dynamics of the 6-DOF platform, and adopted CMAC Neural Networks as controller to realize tailing track. Simulation results showed that the analysis of kinematics and dynamics was correct and the controller had the capabilities of resisting disturbance and good robustness.

Keywords： 6-DOF in-parallel platform     CMAC neural network     kinematics     kinetics    

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Hierarchical control for parallel bidirectional power converters of a grid-connected DC microgrid Article

Hui-yong HU, Yong-gang PENG, Yang-hong XIA, Xiao-ming WANG, Wei WEI, Miao YU

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 12,   Pages 2046-2057 doi: 10.1631/FITEE.1601497

Abstract: The DC microgrid is connected to the AC utility by parallel bidirectional power converters (BPCs) to import/export large power, whose control directly affects the performance of the grid-connected DC microgrid. Much work has focused on the hierarchical control of the DC, AC, and hybrid microgrids, but little has considered the hierarchical control of multiple parallel BPCs that directly connect the DC microgrid to the AC utility. In this paper, we propose a hierarchical control for parallel BPCs of a grid-connected DC microgrid. To suppress the potential zero-sequence circulating current in the AC side among the parallel BPCs and realize feedback linearization of the voltage control, a - -0 control scheme instead of a conventional - control scheme is proposed in the inner current loop, and the square of the DC voltage is adopted in the inner voltage loop. DC side droop control is applied to realize DC current sharing among multiple BPCs at the primary control level, and this induces DC bus voltage deviation. The quantified relationship between the current sharing error and DC voltage deviation is derived, indicating that there is a trade-off between the DC voltage deviation and current sharing error. To eliminate the current sharing error and DC voltage deviation simultaneously, slope-adjusting and voltage-shifting approaches are adopted at the secondary control level. The proposed tertiary control realizes precise active and reactive power exchange through parallel BPCs for economical operation. The proposed hierarchical control is applied for parallel BPCs of a grid-connected DC microgrid and can operate coordinately with the control for controllable/uncontrollable distributional generation. The effectiveness of the proposed control method is verified by corresponding simulation tests based on Matlab/Simulink, and the performance of the hierarchical control is evaluated for practical applications.

Keywords： Parallel bidirectional power converters     Hierarchical control     DC microgrid    

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An Algorithm of Evacuation Time Which Simulates the Evacuation Course

Zhu Jiaying,Zhang Heping

Strategic Study of CAE 2006, Volume 8, Issue 8,   Pages 73-76

Abstract:

In practice, if available safety egress time is longer than required safety egress time, people can evacuate the building in urgency successfully. In this paper, the evacuation facilities such as doors were abstracted as units of the net, and the evacuation course was simplified as series-wound net, shunt-wound net or their built-up system. The expressions of the algorithms for the four different systems were presented.

Keywords： evacuation arithmetic     room unit     series-wound model     shunt-wound model    

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Design on system reliability optimi-zation based on the spare parts’ cost of life cycle

Shao Songshi,Li Qingmin and Li Hua

Strategic Study of CAE 2015, Volume 17, Issue 5,   Pages 25-30

Abstract:

There are problems in the previous system reliability optimization study because of system cost only including system price and without considering the system operation cost during the life cycles. We employ a simple calculation method of the spare parts’cost based on the estimation for spare parts demand during the whole life cycle， in the condition of two kinds of nonlinear reliability-price function， system composition units being not repaired and units’life time obeying exponential distribution， research system reliability allocation optimization as the goal of minimizing the sum of system price and spare parts cost. The simulation results show that the method is simple， convenient and feasible， and can effectively avoid over optimization when only pursuing the lowest system price at the expense of the whole life cycle cost. The system reliability optimization scheme， which based on the spare parts’cost of life cycle， can efficaciously reduce system operation cost during the life cycles.

Keywords： life cycle；the cost of spare parts；reliability optimization；series-parallel system；genetic algorithm    

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Optimal Scheduling of Variable-pressure Variable-flow Operation of Inverter-drive Pumps Connected in Parallel

Li Hongbin,Zhang Chenghui,Song Jun

Strategic Study of CAE 2001, Volume 3, Issue 9,   Pages 52-57

Abstract:

The paper analyzes common methods for the optimal scheduling modeling problem of variable-pressure variable-flow operation of inverter-drive pumps connected in parallel and compares the merits and defects of them. In the common method, the objective function is the shaft horsepower of the pumps and the constrained conditions are water supply target and high-efficiency area of pumps. In another method, the objective function is the square of the difference between the actual and needed flow when satisfying the lift target and the constrained conditions are high-efficiency areas of pumps. The paper proposes a new modeling method, which is compatible with the actual operation and has higher precision and satisfies the engineering requirement on lower switching frequency. Simulation results have proved its validity.

Keywords： optimal scheduling     nonlinear bounded programming     speed regulation of pumps    

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Intelligent Manufacturing of Special Equipment Based on Intelligent Connection

Liu Sanjiang, Chen Zuzhi, Shi Kun, Li Guanghai

Strategic Study of CAE 2020, Volume 22, Issue 6,   Pages 143-150 doi: 10.15302/J-SSCAE-2020.06.019

Abstract:

Special equipment are important for the economic and societal development of a country. Implementing intelligent manufacturing in the special equipment field could facilitate the transformation and upgrades of the special equipment manufacturing industry of China, and it is also an essential component for the China Manufacturing 2025 plan. In this article, we first analyze the characteristics and current status of special equipment in China and summarize the demand for intelligent manufacturing of special equipment. Then we propose some measures and development ideas for promoting the special equipment manufacturing industry from big to strong. We propose that the guiding ideology should be parallel development; the Industry 2.0, Industry 3.0, and Industry 4.0 should be promoted in parallel in the special equipment industry. The development of intelligent manufacturing of special equipment should focus on product traceability, intelligent quality management, and real-time monitoring of dynamic risks. Based on this, intelligent connection is introduced as a technology path for developing intelligent manufacturing of special equipment, and the concept of intelligent connection is further analyzed. Furthermore, the key tasks for future development are building an intelligent connection network of special equipment and developing intelligent applications. 

Keywords： special equipment     intelligent manufacturing     intelligent connection     parallel development    

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Title Author Date Type Operation

A stepless-power-reconfigurable converter for a constant current underwater observatory

Yujia Zang, Yanhu Chen, Canjun Yang, Haoyu Zhang, Zhiyong Duan, Gul Muhammad,yanhuchen@zju.edu.cn

Journal Article

Development and Experiment Research of the Postprocessor for Parallel Kinematic Machine Tools

Li Tiemin,Ye Peiqing,Wang Jinsong

Journal Article

Study on Semi-active Control of Multi-dim Damping Platform Based on Parallel Mechanism and MR Damper

Zhu Wei,Ma Lüzhong,Chen Xiuxiang,Wu Weiguang,Xie Jun

Journal Article

A multi-modular shunt active power filter system and its novel fault-tolerant strategy based on split-phase control and real-time bus communication

Qun-wei XU, Jin-xiang ZHAN, Long XIAO, Guo-zhu CHEN

Journal Article

Active Control of Ocean Vehicle Multidimension Vibration and Motion

Chen Xiuxiang,Ma Lüzhong,Wu Weiguang,Zhu Wei

Journal Article

Research of an Interleaved Low-Voltage/High-Current DC-DC Converter

Wang Ping,Sun Xu,Song Liangyu

Journal Article

Research and Development in the Field of Parallel Kinematic Machines

Wang Jinsong,Li Tiemin,Duan Guanghong

Journal Article

A new variable-mode control strategy for LLC resonant converters operating in a wide input voltage range

Hui-pin LIN,Xiao-guang JIN,Liang XIE,Jin HU,Zheng-yu LU

Journal Article

Posture control of a 3-RPS pneumatic parallel platform with parameter initialization and an adaptive robustmethod

Guo-liang TAO,Ce SHANG,De-yuan MENG,Chao-chao ZHOU

Journal Article

Analysis of Characteristics and CMAC Neural Networks Controller of Electrohydraulic Servo System of the 6-DOF Paralle Platform

Zhai Chuanrun,ZhanXingqun,Zhang Yanhua,Ran Xianglai,Zhao Keding

Journal Article

Hierarchical control for parallel bidirectional power converters of a grid-connected DC microgrid

Hui-yong HU, Yong-gang PENG, Yang-hong XIA, Xiao-ming WANG, Wei WEI, Miao YU

Journal Article

An Algorithm of Evacuation Time Which Simulates the Evacuation Course

Zhu Jiaying,Zhang Heping

Journal Article

Design on system reliability optimi-zation based on the spare parts’ cost of life cycle

Shao Songshi,Li Qingmin and Li Hua

Journal Article

Optimal Scheduling of Variable-pressure Variable-flow Operation of Inverter-drive Pumps Connected in Parallel

Li Hongbin,Zhang Chenghui,Song Jun

Journal Article

Intelligent Manufacturing of Special Equipment Based on Intelligent Connection

Liu Sanjiang, Chen Zuzhi, Shi Kun, Li Guanghai

Journal Article