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Due to the continuous demands for highly reliable and cost-effective power conversion, the quantified reliability performances of the power electronics converter are becoming emerging needs. The existing reliability modelling approaches for the power electronics converter mainly focuses on the predictions of lifetime, accumulated damage, constant failure rate or Mean-Time-To-Failure (MTTF), while...
Static Synchronous Compensators (STATCOMs) are being applied for offshore wind power plants to satisfy the grid codes under both normal operation and grid fault conditions. This paper investigates the performances of Modular Multilevel Cascade Converters (MMCC) for the STATCOM application, with special focus is on asymmetrical Low-Voltage-Ride-Through (LVRT) operation under grid faults. The design...
Due to the adverse temperature swings which normally occur in the power semiconductor devices during the start-up and deceleration periods of the motor drive system, the thermal design and control, as well as the reliability analysis of the power devices becomes crucial. In order to facilitate testing and access the loading and lifetime performances, a novel stress emulator for power semiconductor...
Water, a valuable resource, is usually distributed through urban environments by buried pipes. These pipes are difficult to access for inspection, maintenance and repair. This makes in-pipe robots an appealing technology for inspecting water pipes and localising damage prior to repair from above ground. Accurate localisation of damage is of critical importance because of the costs associated with...
Static Synchronous Compensators (STATCOMs) have been applied for offshore wind power plants to satisfy the grid codes under both normal operation and grid fault conditions. This paper investigates the performances of two types of Modular Multilevel Cascade Converters (MMCC) for STATCOM applications, with the special focus on asymmetrical Low-Voltage-Ride-Through (LVRT) operation under grid faults...
Water is a highly valuable resource so asset management of associated infrastructure is of critical importance. Water distribution pipe networks are usually buried, and so are difficult to access. Robots are therefore appealing for performing inspection and detecting damage to target repairs. However, robot mapping and localisation of buried water pipes has not been widely investigated to date, and...
In this paper, the lifetime prediction of power device modules based on the linear damage accumulation in conjunction with real mission profile assessment is studied. Four tests are performed under two superimposed power cycling conditions using an advanced power cycling test setup with 600 V, 30 A, 3-phase molded IGBT modules. The superimposed power cycling conditions are made based on a new lifetime...
The thermal loading of power electronics devices is determined by many factors and has being a crucial design consideration because it is closely related to the reliability and cost of the converter system. In this paper the impacts of the ripple current to the loss and thermal loading, as well as reliability performances of power devices are comprehensively investigated and tested. It is concluded...
One of the major factors that affects the overall efficiency and reliability of power electronics systems is the dynamical variation of the thermal stress which occurs in the power semiconductor devices. Therefore, the main objective of this paper consists of designing and implementing a series of active thermal control methods for the power devices of a motor drive application. The motor drive system...
The existent problem of the weather radar data lies in its too large data which is not conducive to its storage and transmission. This paper put forward a hybrid compression algorithm of the weather radar data that consists of three steps including pre-compression, lossy compression and lossless compression. Firstly, the paper introduced the radar data's types and characteristics, analyzing the pre-compression...
In order to meet the higher requirements of the future information warfare on the electronic RF system of tank armored platform, this paper presents that the integrated RF system should be applied to the new armored platform. The system is designed with the method of synthetic aperture; it can complete the functions such as airborne target search, precise tracking, threat assessment, electronic warfare,...
It is well known that the dynamical change of the thermal stress in the power devices is one of the major factors that have influences on the overall efficiency and reliability of power electronics. The main objective of this paper consists of identifying the main parameters that affect the thermal cycling of power devices in a motor drive application and modelling their impact on the thermal stress...
It is well known that one of the main causes of failure in wind power applications is due to the power converter and its semiconductor devices. Consequently, the main objective of this paper consists of analyzing the impact of converter derating on the lifetime of the power devices by means of advanced reliability models and tools. The wind power system together with the thermal cycling in the power...
This paper introduces an advanced gate driver used as thermal swing control method for the reduction of AC load current-related ΔTj in Insulated-Gate Bipolar Transistors (IGBTs). A switchable gate resistor network is applied to the advanced gate driver, so that the switching power losses can be changed according to the amplitude of AC current. Accordingly, a closed-loop thermal control method including...
Modular Multilevel Converter (MMC) has been becoming a very important solution for high power and medium power applications, where the efficiency and reliability performance are crucial design considerations. In this paper, three widely used modulation methods for MMC, Phase Shift PWM (PSPWM), Phase Disposition PWM (PDPWM) and Nearest Level Modulation (NLM), are comprehensively investigated to uncover...
Mode-division-multiplexing (MDM) technology has attracted much attention because of the potential to enhance the capacity of an optical-interconnect link for a single wavelength carrier. In this case, one should consider not only the fundamental mode but also the higher-order modes for the design of photonic integrated devices, and thus some novel devices are required. As silicon photonics has become...
In many important energy conversion systems, the power electronic converters are proven to have high failure rates. At the same time, the failures of the power electronics systems are becoming more and more unacceptable because of the high cost of failures. As a consequence, an appropriate assessment of reliability performance for the power electronics is a crucial and emerging need, because it is...
Security in cloud computing is getting more and more important recently. Besides passive defense such as encryption, it is necessary to implement real-time active monitoring, detection and defense in the cloud. According to the published researches, DPI (deep packet inspection) is the most effective technology to realize active inspection and defense. However, most recent works of DPI aim at space...
According to the security policy research in distributed data and information storage, considered from the data access patterns, this paper designs a system with new storage model and query mechanism for distributed platform and big data. This system can provide data sharing integrity check, while giving a hot backup solution, to improve the safety and maintainability of the cluster, and take a viable...
Accurate thermal dynamics modeling of high power Insulated Gate Bipolar Transistor (IGBT) modules is important information for the reliability analysis and thermal design of power electronic systems. However, the existing thermal models have their limits to correctly predict these complicated thermal behaviors in the IGBTs. In this paper, a new three-dimensional (3D) lumped thermal model is proposed,...
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