This paper presents a robust deadbeat predictive power control (DPPC) for pulsewidth modulation (PWM) rectifiers with the consideration of parameter mismatches under unbalanced grid conditions. First, conventional DPPC is modified to extend its application both ideal and Second, tracking error inaccurate grid-side impedance analyzed. Third, discrete-time disturbance observer (DPDO) designed achieve accurate mismatched parameters. The DPDO can predict complex at next sampling instant estimate...

Direct power control with space vector modulation (DPC-SVM) features simple structure, fast dynamic performance, and little tuning work. However, the conventional DPC-SVM cannot achieve accurate under unbalanced grid conditions. A modified is thus proposed for both ideal Though accuracy improved when compared DPC-SVM, it still suffers highly distorted current dc voltage oscillations an network. Therefore, a compensation method subsequently derived aiming at following targets: eliminating...

The sensors in a three-phase pulse width modulation (PWM) rectifier control system are the basis of high-performance methods. Line voltage utilized to obtain information about grid amplitude and phase. To eliminate decrease cost PWM systems, various grid-voltage sensorless methods have been developed. In this article, virtual-flux-based estimation method is model predictive (MPC) rectifier. extended reactive power introduced proposed MPC method; then able realize targets eliminating...

Three-phase voltage source pulsewidth modulation (PWM) rectifiers can achieve constant dc and sinusoidal grid currents under ideal voltages. However, unbalanced conditions, there are ripples at twice the frequency in voltage, become highly distorted. To address aforementioned problems, control methods developed conditions should be modified. Various techniques have been proposed literature to calculate new current reference or power reference. most use conventional pq theory only consider...

In the conventional direct power control (DPC) methods, grid currents are highly distorted, and substantial ripple is present in dc-bus voltage under unbalanced distorted conditions. Various improved DPC methods have been proposed to address these problems, but generally complicated not easy use because of complex controlling structures, need for considerable tuning, so on. This paper proposes an method obtained by simply adding a compensation term original references. The analyzing input...

Deadbeat control (DBC) has been investigated for decades because of its simple concept and satisfactory performance. Recently, finite set-model predictive (FCS-MPC) attracted wide attention in the power converters. Unlike DBC, FCS-MPC does not employ a modulator directly manipulate switching states by minimizing cost function. To improve steady-state performance, some improved FCS-MPCs introducing two or three vectors during one period were proposed existing literature. This paper proposes...

Direct power control (DPC) works well under ideal grid voltage conditions with accurate parameters. However, unbalanced and distorted network conditions, significant ripples current harmonics arise in conventional DPC if no special measures are taken. Furthermore, the system performance further deteriorates inductance value differs from actual value. To cope problems above, this article proposes an online identification method for of a PWM rectifier conditions. It is shown that proposed can...

This article presents a closed-loop virtual-flux (VF) estimator for grid voltage sensorless control of pulsewidth modulation (PWM) rectifier under unbalanced network. Compared with the prior open-loop VF estimator, proposed method shows better filtering capability and improved robustness against load variation. Considering frequency may deviate from nominal value in practical application, an adaptive is further developed online estimation. Additionally, finite set-model predictive power...

The anti-islanding control of the PV grid-connected inverter has long been a concern both utilities and generating equipment owners because potential for safety hazards damage. So islanding effect must be prevented in application system .In this paper, theory passive active detection methods is analyzed compared. Then, according to two kinds conventional course inverter, paper proposes new method namely positive feedback frequency drift, designs test circuit IEEE Std. 2000-929 tests function...

Model predictive current control (MPCC) has been proposed for the of a pulse width modulation (PWM) rectifier due to its simple principle and quick response. MPCC achieves good performance ideal grid voltages when an accurate inductance value is known. However, actual are usually unbalanced distorted, may vary with working condition. In these conditions, PWM deteriorates significantly harmonics power ripples. To cope distorted variations, this paper proposes model-free (MFPCC) rectifier,...

The grid-connected photovoltaic system is the trend of system. On basis analysis equal circuit about solar cell and character curve, for two-stage inverter, provide maximum power point tracking (MPPT) methods, design a inverter based on DSP which controls point. Trough testing old designed has many unstable questions when point, after experiments analysis, providing an improved way. experiment proves runs stably reliably.

Photovoltaic (PV) grid-connected system is the development trend of photovoltaic systems. According to PV characteristics, analyzes maximum power point tracking(MPPT) control strategy based on two-stage conversion architecture, proposed a novel MPPT algorithm, it can achieve tracking by only detect one parameter-the inverter output current. In Matlab/Simulink simulation environment, building model and scheme, find quickly steadily, compared with widely used algorithm result, proved...

Direct power control (DPC) is an attractive method for three-phase pulse-width modulation (PWM) rectifiers, due to the merits of simple structure, quick dynamic response and little tuning work. However, conventional switching table based DPC presents relatively high ripples current harmonics, which especially serious when grid voltages are unbalanced. Introducing space vector (SVM) into can obtain improved steady state performance with fixed frequency. it still highly distorted oscillations...

With the wide application of sensors, people's behavior in life has been transformed into data resources. The emergence big can more effectively deal with a large amount information generated. Network is increasingly applied to analysis economic problems. By analyzing common phenomenon price discrimination life, we better solve differences between buyers and sellers. Because both businesses care about number vested interests, it necessary find way balance two psychologically. Sellers feel...

With the development of fluorescence molecular tomography (FMT), it has become an important tool for life science research. Many methods were developed to improve reconstruction performance FMT. However, these only focus on accuracy and speed reconstruction, while ignoring morphological information tumor. In this paper, modified L_2,1-norm method adopted reconstruct morphology mouse orthotopic glioma. To verify method, we carried out simulation experiment in vivo glioma experiment....

Voltage controlled oscillators (VCOs) have been shown to be a critical block of single-event transient (SET) response in mixed-signal circuits used for satellite communication such as the phase-locked loop (PLL). After analyzing mechanism frequency drifted, novel structure VCO consisting SET hardened bias generator and two cross coupled ring oscillator (RO) cell was designed. This designed 130-nm process which had proposed minimize drift caused by pulse, thus improve stability circuit. Spice...

Quasi-Z-source inverter (QZSI) is a new topology, which has been proposed to be simple and realize the single stage energy conversion in recent years. Due unique impedance network structure, it characteristic of shoot-through. In this paper voltage-source QZSI applied grid-connected photovoltaic system. Firstly operating principle deep analyzed, then system using proposed. order conform requirement grid-connection, decoupling control thought active current reactive by d-q rotating coordinate...

Abstract In this paper a voltage-source Quasi-Z-source inverter(QZSI) is applied to grid-connected photovoltaic system. Firstly the operating principle of QZSI analyzed, and then system using proposed. For meeting requirement grid-connection, decoupling control thought active current reactive by d-q rotating coordinate modified PWM strategy are studied. The rationality feasibility proposed verified through MATLAB/Simulink.

Abstract Based on the transient planar pitching method, dynamic derivative calculation function is implemented an unstructured computational fluid (CFD) software NNW-FlowStar. Then pitch-damping derivatives of standard model ANF missile at zero angles attack and different Mach numbers (0.5∼4.5) are calculated. The influence various numerical physical parameters results studied in detail. It found that pitch damping independent values amplitude (0.125° ≤ A 1°) reduction frequency (0.025 k...