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The neutral-point potential control is very difficult for the NPC three-level converter. This paper proposes an accurate model of the NPC three-level converter with parametric perturbation. The developed model mathematically describes that the basic reason for the neutral-point potential drift is the unbalanced distribution of active power caused by parametric perturbation. By injecting zero-sequence...
The traditional identifier locator split network has many issues such as inflexibility, hard to innovate and difficult to deploy. SDN (Software Defined Network) provides a new direction for designing flexible identifier locator split network. The recent identifier locator split network based on SDN use the OpenFlow swicth directly via rewritting the address, which lacks the scalability and utilizes...
In a DC microgrid (MG) with droop control system only, there exists an inherent deviation between DC bus voltage and its rated value during the steady-state operations. In order to eliminate the inherent deviation, a secondary voltage regulation system (SVRS) based on vanadium redox battery (VRB) storages is proposed in this paper. It adopts double closed loop control strategy coordinating with the...
The stochastic nature of wind speed, time-varying of system parameters, system lagging and nonlinearities can lead to instability of the power generated by wind turbines. In order to improve the dynamic performance in the operation region of constant power output, multivariable control strategy using a sliding mode control technique is proposed based on analysis of the pitch-controlled system research...
This paper presents a low harmonic 12 pulse rectifier. Then in order to investigate the influence of leakage inductance on 12 pulse rectifier. A set of improved switching function method is proposed. To obtain the mechanism that input current harmonics can be suppressed by circulating current of DC side, this paper analyzes the relationship between input current, output current and circulating current...
In this paper, cascaded H-bridge multilevel inverter (CHBMLI) based distribution static compensator (DSTATCOM) has been proposed. Synchronous reference frame theory (SRFT) based indirect current control is employed to extract the reference current. The instantaneous error in between the reference current and output current is processed through multiband hysteresis current controller (MHCC) for inner...
Interleaved double dual boost (IDDB) DC-DC converters are widely used in high-power renewable energy conversion applications, which can provide both high step-up ratio and low current ripple. This paper is focused on the nonlinear modeling and control of non-ideal IDDB converter. A sliding mode controller is design based on the model with parasitics considered. Some key issues on the control design...
Single-phase grid-connected inverter (GCI) is a kind of single-phase voltage source converter (VSC), and as the indispensable tie unit between different power supplies, it is widely used in the fields of wind generation and solar PV generation. In the paper, as first, on the basis of the concept of the discontinuous pulse-width modulation (DPWM) for three-phase VSI, a new DPWM of single-phase GCI...
Bidirectional DC-DC converter (BDC), is being widely used in all kinds of fields as both charger and discharger which can greatly lessen the volume and weight of the whole applied system. This paper analyzes mainstream topological structures of BDC and then proposes a bidirectional half-bridge converter with Micro Control Unit (MCU) in control of three working modes: buck charging mode, boost discharging...
In the past, street lamps were turned on or off by a simple Timer or switch. When a street lamp did not light due to fault or electric leakage, it would not be found until it was reported by somebody or found by patrol men. In addition, sometimes the wires for street lamps were stolen, and because the street lamps were extensively distributed, they could not be completely protected by laborers. Street...
As the development of control theory in power electronics, kinds of control methods are used in high-voltage power supply's design. Simulation is one of the keys to verify the control method accuracy when designing a supply system. In this paper, a phase shifted control method is utilized in parallel resonant circuit, and the condition of the power electronic switch devices during the process of phase...
The effect on harmonic performance for a three-level active neutral point clamp (ANPC) converter with small change in Selective Harmonic Elimination Pulse Width Modulation (SHEPWM) switch angles is researched. A small change in the SHEPWM switching angles is used to balance the neutral point voltage for the three-level ANPC converter. But this strategy may result in bad harmonic performance of the...
Traditional IGBT turn-on loss evaluation methods are curve fitting of double pulse test data without insight of IGBT turn-on process. This paper proposed an analytical evaluation method of IGBT turn-on loss. In the proposed method, a qualitative IGBT switching waveform and an IGBT switching trajectory in output characteristics are used to analyze IGBT turn-on process. The detailed expressions for...
A novel direct ac-ac converter based on the switched-capacitor and series resonant principle, featuring with soft switching characteristic and bidirectional power flow, is proposed in this paper. The converter consists of a LC resonant tank, switched-capacitors and reverse blocking IGBTs (RB-IGBT), resulting in small size and light weight; high efficiency is achieved by adopting soft switching technology...
An adaptive modified dynamic surface tracking controller for a nonholonomic wheeled mobile robot (WMR) with parametric uncertainties is proposed. The dynamic surface control (DSC), with Levant's differentiator instead of the commonly adopted first-order filter, is incorporated to alleviate the so-called explosion of complexity problem. The major advantage is its finite-time convergence which in turn...
Due to the inherent DC fault handling ability and small transformer size, isolated modular multilevel DC-DC converter (IMMDCC) is attractive for medium- and high-voltage DC-DC conversion applications. However, with increasing of the operation frequency at the AC stage, the voltage balancing of the floating cell capacitors is a new challenge because the existing modulation and voltage balancing strategies...
In this paper, a new solar battery charger is proposed. The solar battery charger is composed of two solar modules and a dual-input DC-DC power converter. The two solar modules are connected to the dual input ports of dual-input DC-DC power converter, and the output of dual-input DC-DC power converter is connected to a battery set. The operation of dual-input DC-DC power converter is divided into...
Based on the theoretical model of three-level converters, a mathematical model of the predictive active power and reactive power control is deduced. Relationship of both active power and reactive power with voltage vectors is analyzed from an instantaneous power perspective. Influence and tendency caused by voltage space vectors on the active power and reactive power are described in detail. Because...
Nowadays, the requirement of reliability and fault-tolerance for measurement and control systems become more and more significant. A design of high-availability hot-swap based on compact PCI(CPCI) bus is proposed to solve the problems in applying and testing the modular redundancy and fault-tolerance in the systems. And a semi-physical simulation platform would be designed that could test the hot-swap...
An improved genetic algorithm based on fuzzy inference theory is proposed in this paper, which is applied in faulty location of distribution network. This algorithm improves the problem of faulty operation caused by the distorted signal transmission in traditional faulty location method and the problem of premature convergence and slow convergence speed of standard genetic algorithm. Firstly, a mathematical...
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