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This paper examines the problem of generating testing actions for electronic industry test systems designed for verification of electronic packages of UHF band. This paper shows complex problems of setting amplitude and time parameters of multichannel generators of test signals. The problems of multichannel wide range signal generation and frequency control, rise and fall time control, pulse time...
In the event of a large blackout in the smart distribution system with distributed generators, a power supply restoration plan for the non-fault blackout regions must be devised quickly. According to the actual operation of the smart distribution network with DG after fault and the prin-ciple of islanding, this paper determines the running range of the island, maintains the power supply of the important...
The paper deals with a high efficiency boost rectifier for high rotational speed Gen-Set applications. It is tailored around a permanent magnet synchronous generator (PMSG) featuring an open end winding configuration. According to such a configuration the generator stator windings are connected on one side to a three level T-type unidirectional rectifier, and on the other side, to an auxiliary two-level...
In this paper, a non-overlap clock (NVC) generator for high accuracy fully differential Switched Capacitor (SC) readout circuit which is applied in Micro-Electro Mechanical System (MEMS) differential sensor is proposed. Compared with traditional generator, generating a set of non-overlap clock, this circuit generates a new set of clocks which are being nested inside the primary non-overlap clocks,...
This paper presents a complete analysis, design and implementation of an enhanced space vector pulse width modulation (SVPWM) control for six-phase to three-phase grid connected matrix converter. The matrix converter (MC) is designed based on 18 bidirectional switches in order to interface a high performance fault tolerant multiphase permanent magnet synchronous generator (PMSG) to the main utility...
The photovoltaic (PV) source simulators are widely used to test solar inverters, evaluate their control algorithms and study their grid integration issues in the laboratory settings. Many commercial programmable dc power supplies can be re-programed to be PV simulators. Due to the bulky output dc capacitors, the dynamic response and the bandwidth of these PV simulators are significantly limited, which,...
This work introduces a general formulation of the reconfiguration problem for untimed discrete-event systems (DES), which can be treated directly by supervisory control theory (SCT). To model the reconfiguration requirements we introduce the concept of reconfiguration specification (RS); here reconfiguration events (RE) are introduced to force a transition from one system configuration to another...
This paper proposes a method of variable switching frequency pulse-width-modulation (PWM) to suppress current ripple when aircraft start generator (SG) operates in the starting mode. Compared with the widely used constant switching frequency PWM, the method can work evidently, especially in the range of low speed. Based on analysis of dead-time effects in the two-level voltage source inverter, relationship...
We applied test automation in the style of Behavior-Driven Development (BDD), an agile software development technique. In applying BDD, the problem is that a large amount of similar configurations of network switches have to be written in the BDD test specification files. To solve this problem, parameterization of configurations is considered effective. However, Gherkin, the BDD test specification...
The paper considers the events flow generated with the ergodic semi-Markov processes which are rather adequate formalisms to describe informational-measuring systems under the Von Neumann computer control. Pearson's regression and correlation criteria for estimation of the proximity events flow to the Poisson flow are investigated. It is shown that the procedure used for such criteria calculation...
As the demand for data increase and the need for higher density network load, greater resiliency and efficiency a need for a reliable power distribution and back up is required. Currently our −48VDC distribution has limitation in size (kW), length of cable run and large battery reserves. Higher Voltage DC offers a number of benefits for Telstra from reduced cable size, simplified distribution set...
Vacuum as switching medium has been established widely in the distribution systems for more than 30 years. Well known for its outstanding and reliable interrupting capability of fault and load currents of all possible nature, the vacuum switching technology is now dominating the medium voltage level up to 52 kV. Technical advancements in the field of vacuum physics in last decades made it possible...
This paper investigates the event-triggered and self-triggered state feedback control for networked control systems (NCSs) with short network-induced delays and packet loss. First, we use a switched system model to describe such a system, which is prior to describe the uncertainty and the time-varying characteristics of the network-induced delays. Based on the switched system model, the co-design...
The rapid proliferation of devices of the Internet of Things requires a vast network of heterogeneous devices to maintain the ability to communicate rapidly and seamlessly. The transition to delay sensitive Tactile Internet applications would demand on a new information and communications infrastructure. In our previous work, we have proposed a fast Location basEd Source Switching (LESS) mechanism...
This paper concerns the application of three-level neutral point clamped (NPC) voltage source inverter (VSI) to electrical energy conversion of the photovoltaic (PV) power plant. The grid-connected 3-phase NPC inverter is powered via the split DC-link composed of the capacitive divider (Fig. 1). It enables the usage of two DC-buses independently which can be supplied by the separated boost-type DC-DC...
For Dual Active Bridge (DAB) converters a large number of modulation schemes exist, which allow to operate the converter in a wide voltage/power range at a very high efficiency. However, the implementation of these modulation schemes and the transition between the schemes during transient conditions is relatively complicated. Therefore, a simple and flexible concept for generating the PWM signals...
High electric field pulse sterilization is one of nonheat sterilization, and is a new sterilization technique for liquid food. In this sterilization method, we apply high voltage pulses to liquid food. The general impulse generator is the Marx circuit. The impulse generator with the spark gap switch has two disadvantages; the charge time is long and the rise rate of applied voltage is slow. In this...
In digital logic circuits, unconstrained scan tests are known to evoke much higher switching activity than functional modes. To create test conditions which are as similar as possible to functional modes, today's ATPG tools have knobs to constrain the switching activity of the generated test to a user-defined functional (= lower) level. Two-dimensional system chips (SoCs) and three-dimensional stacked...
At microgrids, classical grid-regulating generators are replaced by converter-interfaced distributed generation (DG) or energy storage systems (ESSs). This causes a reduction of the total inertia of the system and hence the microgrid voltage and frequency become more susceptible under power variations. DC microgrids are specially affected by this phenomena as systems with rotating inertia can not...
To ensure the reliability of insulation systems of Type-II inverter-fed motors driven by power electronics, endurance tests should be performed at sinusoidal or repetitive impulsive voltage higher than the partial discharge inception voltage (PDIV) on insulation systems/models according to the standards released by the International Electrotechnical Commission (IEC). When repetitive impulsive voltages...
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