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Ripple current at twice the output frequency exists at dc side in single phase inverter due to the instantaneous power imbalance between input and output power. Neutral-point voltage waveform control method is proposed in this paper to eliminate the ripple current in E-capless full-bridge inverter. With the proposed method, the pulsation power is controlled to only flow through ac capacitors and the...
China Machinery Industry Standard (CMIS) GB/T 12326-2008 prescribed in the islanded operation mode, microgrid inverter (MGI) output voltage dynamic transient range is less than 10% when the resistive load is switched rapidly between 0% and 100%. The three-loop power virtual synchronous generator (VSG) control methods are commonly used in MGI units to share the loads among the parallel MGIs. However,...
PR controller in stationary frame which is equivalent to PI controller in synchronous frame has been widely used in the application of PV inverters. While little attention has been devoted to VR(vector-resonant) controller in the application of PV inverters. VR controller in stationary frame is equivalent to VPI(vector PI) controller in synchronous frame, which takes decoupling into consideration...
The operating characteristics of photovoltaic (PV) cells are essential to the design of steady-state characteristics and control parameters of the interface converter in output voltage regulation (OVR) mode. From the perspective of output voltage closed-loop control stability, the effect of control loops form of the interface converter in OVR mode on the operating characteristics of PV cells is studied...
An improved PID sliding mode control strategy with constant switching frequency for the voltage regulator of doubly salient electro-magnetic generator has been proposed in this paper. Next, operating principle of controller was described in detail and the stable condition of the system was deduced by Lyapunov function based on mathematical model and working principle of generator. Considering improved...
According to the DC bias problem of AC power network, this paper puts forward the new type power transformer based on two-phase magnetic materials, which uses flux of two-phase magnetic materials to counteract flux of DC bias. In order to get variable stable flux of two-phase magnetic materials, intelligent control system is proposed with PWM controlled rectifier and detecting circuit of peak value...
DC voltage control and power distribution are significant requirements for multi-terminal HVDC control system. The common voltage droop control has the drawback of failing to keep the dc voltage at a fixed value if active power is fluctuating, and voltage margin method actually controls dc voltage only by one converter at a time. A novel control strategy-Coordinated DC Voltage Control-is thus proposed...
The scale of a distributed grid-connected solar photovoltaic (PV) generation system keeps growing, which is naturally composed of many subsystems interacting with each other. In this paper, a novel distributed predictive control based on data-driven subspace approach is proposed to design the predictive controller of the grid-connected inverter in the distributed solar PV generation system. The control...
In this paper, an on-board charger for electric vehicle, with two-stage power converter, is designed. Firstly, a single-phase Boost-APFC (Active Power Factor Correction) circuit controlled by a one-cycle controller is designed as the front state converter. Compared to the traditional APFC circuit, the One-cycle controller is constructed without considering the multiplier and AC line voltage sensing...
A three-phase voltage source PWM rectifier(VSR) has some shortcomings that can lead to resonance, resulting in system instability problems. A novel multi-loop control strategy and a design of the control structure in synchronous coordinate system for LCL-VSR is proposed in this paper to solve the problem. The strategy belongs to active damping control, which introduces the filter capacitor current-loop...
This paper aims to analyze the applied hybrid controlled three-phase grid-connected inverter for marine current power generation system used in distributed generation. As inverter is a key part of the grid-based system, grid-connected technology plays an important role in the distributed generation to meet the stricter grid interconnection standards. In order to improve the power quality and strengthen...
The conventional PV systems based on the voltage inverters only inject dispatched power to the utility grid when they work at a grid-connected mode in the hydro-PV hybrid microgrid. Due to the droop method employed for load sharing between generators, as well as the enormous inertia of system. The existence of frequency steady-state error and the slow active power/frequency dynamic response are inevitable...
In order to deal with frequency restoration and protect the energy storage units, this paper analyses the control method of microgrid based on hierarchical control, and proposes an innovative secondary frequency control method which optimize the output of energy storage units in island mode. The simulation results show that the algorithm can make microgrid provide high stability and power quality...
This paper presents a technique to be used for the cellular phone charger. The proposed technique identifies system conditions to control the output voltage, measuring only the primary side voltage and current. The method estimates the load and the coupling coefficient of the circuit by perturbing the operating frequency. The control method, designed in Primary-Series-Secondary-Series (SS) topology...
Multi-Modular Converter System (MMCS) has widely application in power conversion field. Through analyzing previous researches, a hierarchical structure of MMCS is proposed, which includes four layers: application layer, power layer, communication layer and control layer. Based on the structure, MMCS design can be converted into modularized design method, which offers a possibility to the standardization...
This paper introduces a novel multiplex voltage source converter topology based on common DC bus. Except from the excellent characters of traditional VSC, the capacity of the system can be expanded. Dual mode control is proposed to stabilize DC bus voltage, when the superconducting inductor current is between the maximum and the minimum allowable value, chopper control mode is adopted; when the current...
This paper present a study of the isolated DC/DC stage of Bi-directional on-board battery charger module (OBCM) for electric vehicle (EV) and plug-in hybrid electric vehicle (PHEV) application. The modulated dual active bridge (DAB) converter and boost series resonant converter were thoroughly analyzed for this application. The ZVS boundary conditions, power stage optimization compatible to wide output...
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