Design of insulator automated cleaning end-effector based on current feedback control

In September 2020, the Chinese government pledged at the 75th United Nations General Assembly to achieve peak carbon emissions before 2030 and carbon neutrality before 2060. As the nation advances its carbon peaking and carbon neutrality goals, the demand for technologies supporting green and low-carbon transitions has surged, particularly in high-energy-consuming sectors like power inspection. Traditional manual inspection methods are struggling to meet the operational and maintenance demands of modern smart grids due to limitations such as low efficiency, high operational risks, and incomplete inspection coverage. While unmanned aerial vehicle (UAV) inspection offers significant advantages, its limited flight time remains a major challenge to its widespread adoption. This paper focuses on analyzing and optimizing the endurance of UAVs in power line inspection based on wireless power transfer (WPT) technology. The aim is to provide a more efficient charging solution for UAVs by proposing strategies to maximize channel gain, thereby overcoming endurance limitations and promoting the extensive application of UAV technology in smart grid inspection to support the national strategy for green and low-carbon transition.

This paper comprehensively investigates and compares different multiloop linear control schemes for single-phase pulsewidth modulation inverters, both in stationary and synchronous (d -q) frames, by focusing on their steady-state error under different loading conditions. Specifically, it is shown how proportional plus resonant (P + R) control and load current feedback (LCF) control can, respectively, improve the steady-state and transient performance of the inverter, leading to the proposal of a PID + R + LCF control scheme. Furthermore, the LCF control and capacitive current feedback control schemes are shown to be subject to stability issues under second and higher order filter loads. Additionally, the equivalence between the stationary frame and d -q frame controllers is discussed depending on the orthogonal term generation method, and a d-q frame voltage control strategy is proposed eliminating the need for the generation of this orthogonal component. This is achieved while retaining all the advantages of operating in the synchronous d-q frame, i.e., zero steady-state error and ease of implementation. All theoretical findings are validated experimentally using a 1.5 kW laboratory prototype.

Optics swing mirror is a core module with special requirements of high precision and fast response in target simulator of infrared interference.In order to achieve theses pecial requirements,a design method of servo control system is proposed.The high-precision control system which adopts angle feedback and velocity feedback by PID algorithm is built with DSP,brushless resolvers and limited angle brushless torque motor.The experimental result indicates that the system can make the swing mirror achieve precise movement control and fast response.The design method of the servo control system can be widely used in the area of high-precision scanning control systems and has good application prospect in engineering.

Research on resonance mechanism and damping method of grid-connected inverter with LCL filter for battery energy storage system

This paper proposes a current harmonic suppression strategy that combines harmonic synchronous rotating frame (HSRF) current feedback control and back-electromotive force harmonic (BEMFH) feedforward compensation to suppress the fifth and seventh current harmonics of a six-phase permanent magnet synchronous motor (PMSM). The current harmonics of six-phase PMSMs vary with the current due to manufacturing imperfections and the inverter nonlinearity effect. Using fixed-parameter BEMFH feedforward compensation cannot completely eliminate current harmonics. This paper integrates a closed-loop harmonic current control strategy, using HSRF in the differential mode of the six-phase PMSM rotor rotating frame to effectively mitigate current harmonic variations caused by load changes. The controller adapts a Texas Instrument microcontroller featuring encoder interfaces, complementary pulse width modulation (PWM), and analog–digital converters (ADC) to simplify the board design. The rotor angle feedback is provided by a 12-pole resolver in conjunction with an Analog Device resolver-to-digital converter (RDC). The specifications of the six-phase PMSM are as follows: 12 poles, 1200 rpm, 200 A (rms), and 600 V DC bus. The total harmonic distortion (THD) of the phase current for harmonics below the 21st order was reduced from 31.71% to 4.84% under the test conditions of 1200 rpm rotor speed and 200 A peak phase current. Specifically, the fifth and seventh harmonics were reduced from 29.98% and 9.72% to 2.74% and 1.21%, respectively. These results validate the feasibility of the proposed current harmonic suppression strategy.

The book is examined in the context of its suitability for a first engineering course in feedback control. The text covers several topics normally included in the most current introductory feedback control texts, including: transfer functions and state-space descriptions; Routh-Hurwitz and Nyquist stability criteria; and state-feedback and linear-quadratic regulator theory. It also includes more contemporary topics, such as: robust stability and performance for unstructured perturbations; strong stabilization and Youla parameterization; generalized plants and H/sub/spl infin// design; and H/sub/spl infin// optimization by model matching and interpolation theory. Short appendices are included on normed linear spaces, matrix and abstract algebra, and state-space system manipulations. The material is well presented, with careful proofs of key results. Each chapter includes numerical examples, together with a good list of homework exercises. Some Matlab functions for computing numerical solution are mentioned, but the discussion of software is limited. Unfortunately, the mathematical level of the test is too high, at least for most programs in the United States. The book also omits several standard topics associated with engineering course on feedback control, such as modeling of physical systems, root-locus analysis, digital control, and an introduction to nonlinear systems. As it is, the book would make a very good test for a graduate engineering course in linear feedback control. It could also be a valuable reference for graduate engineering students or applied mathematics students interested in research in the control area.

A control and stabilizing approach for chaotic behavior of converter is introduced in this paper for the removal of harmonic caused by chaotic behavior in current converter. For this work, a TDFC control Method for stability chaotic behavior of boost converter for switching courses in current control mode is presented. For analyze equations in converter the behavior converter presents by discrete equations. This behavior is demonstrated by presenting a piecewise linear discrete map for this converter and then combining the feedback equation (that is contain current control equation and Time delay feedback control equation) to obtain the overall equation of the converter. A simple time-delay feedback control method is applied to stabilize the unstable periodic orbits (UPOs). By using the time-delayed feedback control method, the stability limit and gain range of the system are increased

A method of computing the reference currents for current tracking feedback control, called a balanced commutator, is presented. For a given motor, this commutator reduces the peaks and the rates of change of the reference currents. Although primarily intended for lower-speed direct-drive applications, the commutator design allows accurate current tracking, and therefore reduced torque ripple, over a reasonably wide range of operating speeds. Three motor models, (analytical, numerical, and measured) are considered. Issues relating commutation schemes to amplifier requirements are addressed by simulating simple analytical models of the electrical dynamics. To reveal the interplay between motor design and commutator output, torque models produced by numerical field calculations are considered. To demonstrate the practical benefits and limitations of the method, a balanced commutator based on measured motor data is implemented, and torque ripple reduction is quantified in a laboratory experiment.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

This Paper Present here with an aim to analyze, simulate and examine the Operation of non-isolated interleaved Cuk/Chook (step up mode) Converter. Here, Input Voltage of proposed Converter was maintaining below the 50 V to keep the cost of our operation low and moderate. Existing Traditional Cuk converter (TCC) has the Continuous Current at input as well as output side. This proclivity of Converter is taken for our performance Observation to analyse the behaviour of proposed Structure. In Accordance with that, non-isolated interleaved Cuk/Chook Converter(ICC) is to be schemed/overtures and simulated here, to inspect the reduction in the ripple content on input and output waveform and it also enhances the Settling time of system. These unwanted ripple content is diminished or almost eliminated by implementing the Interleaved structure to existing converter topology with the current and voltage feedback control loop. Cuk Converter topology (TCC and ICC) gives output voltage with negative Polarity as compared to input voltage polarity. This interleaved configuration of converter is useful to achieve high gain and efficiency with limited duty cycle and wide load variation range.

Dynamic Voltage Restorer (DVR) is a practicable and economical way to ensure the energy quality of power system. Under the study of the control strategy that combine grid voltage feed-forward control with the load voltage and capacitor current double closed-loop feedback control, the traditional Proportion Integration (PI) controller in feedback control is analyzed, and a novel control strategy combining adaptive fuzzy-PI control with repetitive control is proposed. The theoretical analysis and the simulation results show that the proposed control strategy has excellent dynamic and static performance as well as good anti-jamming capability.

In this paper, a variable frequency soft-switching control for a three-level half bridge (TLHB) buck converter is proposed to achieve wide-range output battery charging function without losing zero voltage switching (ZVS) or high efficiency. The adopted variable frequency triangle-current-modulation (TCM) is based on dc measurement and average-model calculation, thus able to realize ZVS operation fully digitally without current zero-crossing-detection (ZCD) circuits. A top-level average current or output voltage feedback controller further ensures the desired power or output voltage regulation. Experimental results from a GaN based TLHB prototype have shown the reliable TCM control and smooth transition of ZVS operation through the charging procedure.

Photovoltaic solar electrodialysis with bipolar membranes

Plasma Current and Shape Control in the Iter Tokamak under Actuator Saturation

Permanent magnetic-electromagnetic hybrid suspension system can effectively reduce energy consumption and heat release of the system, but also increase the difficulty of suspension control because of the existence of permanent magnets. The traditional current feedback control method is not conducive to the stability of the system and is difficult to debug. In this paper, the models of permanent magnetic-electromagnetic hybrid suspension system based on current feedback and magnetic flux density feedback are established. The effects of current feedback and magnetic flux density feedback on the stability of the system are analyzed in theory and the advantages of flux density feedback are pointed out. The model of magnet flux feedback is simple and it can overcome the disadvantages of current feedback, which is beneficial to the stability of the system. The magnetic flux density feedback control of permanent magnetic-electromagnetic hybrid suspension system is realized by simulation and experiment. Control system performs well and is easy to debug.

In the application of LCL-filter based converters, the structure and parameters of current-controller is very important for the system stability and output current quality. This paper presents a filter-capacitor current feedback control scheme for grid-connected converter. The controller is consisted of a proportional-resonance regulator and a proportional regulator. Unlike the existing control strategy with unit capacitor current feedback, the proposed method applies the proportional regulator to the feedback path, which can decouple these two regulators, and simplify the tuning process. Controller parameters are tuned with the aid of root-locus of system close-loop transfer function, which can provide better grasp of the influence of individual parameters and make the design process visible and holistic without any simplification and assumption. The validity, reasonability and feasibility of the control strategy and the proposed current controller design method are verified by the simulation results of a 50kVA grid-connected inverter.