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Battery energy storage system based on modular multilevel converter (MMC-BESS) has many advantages such as easy expansibility and high reliability. With multiple submodules (SM), the corresponding SM fault ride-through method is mandatory to reduce the construction redundancy and improve the operational reliability. This paper proposes a redistributed pulse width modulation (R-PWM) method for MMC-BESS...
This paper proposes a new control method for two stage converters to realize the virtual synchronous generator (VSG) operation, which also can help eliminate circulating power between energy storage (ES) converters. It is proven in this paper that the proposed method shares stronger resemblances with synchronous generators (SGs) than traditional VSG in aspects of power conversion process and mathematical...
By using generalized regression neural network clustering analysis, effective clustering of five kinds of network intrusion behavior modes is carried out. First of all, intrusion data is divided into five categories by making use of fuzzy C means clustering algorithm. Then, the samples that are closet to the center of each class in the clustering results are taken as the clustering training samples...
The resonance problems may arise among multi-connected LCL-filtered inverters and make the system instable. The recently proposed GSPWM can reduce the filter order without reducing other performance in large-scale application, which has potential to avoid the resonance. But GSPWM will introduce specific phase delay to PWM sequences and it may influence the response character in different grid conditions...
Frequency control is significant to maintain the stability and reliability of islanded microgrids. Generation side controls, e.g., virtual synchronous generator control and droop control, have been widely adopted to stabilize the frequency of islanded microgrid. However, this is not ideal method due to the capacity limitation and power fluctuation of distributed generation(DG). Meanwhile, energy storage...
High performance beam scanning is one of the key enabling techniques in various laser applications, where voice coil actuators (VCA) and acousto-optical deflectors (AOD) have been employed to guide the beam deflection. To further improve the deflection angle and accuracy of the beam scanning systems, it is now possible to combine the VCA and AOD actuators as a compound axis servo system, where the...
Learning complex robot manipulation policies for real-world objects is challenging, often requiring significant tuning within controlled environments. In this paper, we learn a manipulation model to execute tasks with multiple stages and variable structure, which typically are not suitable for most robot manipulation approaches. The model is learned from human demonstration using a tactile glove that...
We present a design of an easy-to-replicate glove-based system that can reliably perform simultaneous hand pose and force sensing in real time, for the purpose of collecting human hand data during fine manipulative actions. The design consists of a sensory glove that is capable of jointly collecting data of finger poses, hand poses, as well as forces on palm and each phalanx. Specifically, the sensory...
With more HVDC inverters are located in close proximity, the complicated interaction between each inverter is inevitable. Besides the electrical topology of AC grid connected with inverters, the regulators of DC systems also play a very important role during the dynamic procedure. The conventional index of MIIF presented by CIGRE lacks the consideration of dynamic control in HVDC systems. In this...
With the wide application of multi-system sharing a common base station antenna, influence of 2nd order and 3rd order passive intermodulation distortions(PIM) of inter-2G/3G/4G communication systems is more serious. The problem of transmission PIM introduced by antenna systems used for transmission and processing of GSM and LTE signals is addressed. The low PIM antenna used for reference measurement...
In islanding microgrid, the distributed generation (DG) units should take over the microgrid and meet the power demand of loads. Due to the randomness and capacity limitation of DG units, the islanding microgrid may face overload challenge with load increasing. The islanding microgrid need massive energy storage system for power reserve or load shedding to maintain microgrid stable. However, this...
There is a large risk of sub-synchronous oscillation in the large-scale wind plants connected to the series-compensated transmission system. The sub-synchronous oscillation will cause the wind plants to take off from the grid and damage crowbar circuits, which seriously threatens the safe and stable operation of the power grid. The external impedance characteristic of direct-drive permanent magnet...
This paper presents a novel dual transduction gas sensor providing both resistance and mass modalities for single sensor gas identification. The proposed sensor relies on a configurable dual mode frequency/resistance readout circuit, which enables the use of a single conventional surface acoustic wave (SAW) device. Unlike prior works which all rely on custom-made gas sensors, the proposed sensor is...
In recent years, the number of intelligent network terminal is increasing, and networking technology, cloud computing technology has been widely applied in various fields, thus increasing the amount of data in the Internet, the society entered a new era of big data. But because of the characteristics of big data itself, it is often affected in operation by many factors lead to data leaks, information...
This paper reviews the already published current source converter (CSC) topology solutions for high power applications, discussed their advantages and limitations, and then proposes a cascaded modular H7 current source inverter (CSI), which features the characteristics of classic CSC and combines the unique advantages of shunt-connected switch in H7 CSI. A compatible modulation strategy with its operational...
An in-fiber acoustic wave induced tunable Mach-Zehnder interferometer based on a sandwich-structured single mode fiber was demonstrated. The proposed configuration gains advantage of simple structure and fast tuning speed.
A single-longitudinal-mode ring laser of 3.3 kHz linewidth stabilized by a microsphere resonator was demonstrated, and its wavelength could be linearly and continuously tuned within 0.15 nm by changing the pump power.
Based on a vivid simulation training environment, substation secondary circuit simulation system can improve the training effect for substation operation. During practical training, some virtual measurement instruments have to be used. It is necessary to discuss the technology implementation of virtual measurement system of substation secondary simulation circuit. The model of virtual digital multimeter...
With the recent advancement of the Internet of Things (IoT), it is now possible to process a large number of sensor data streams using different large-scale IoT platforms. These IoT frameworks are used to collect, process and analyse data streams in real-time and facilitate provision of smart solutions designed to provide decision support. Existing IoT-based solutions are mainly domain-dependent,...
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