With the increasing capacity of grid connected wind farms, influence power to stable operation an electric system is becoming more and important. In order analyze active output characteristics farm, a multimachine representation dynamic equivalent method based on fuzzy clustering algorithm proposed. First, indicators which can characterize performance doubly fed induction generator (DFIG) are researched. Second, C-means (FCM) first applied modeling farm. DFIGs divided into groups by...

This article proposes a Bayesian method to acquire the estimation of human impedance and motion intention in human–robot collaborative task. Combining with prior knowledge stiffness, estimated stiffness obeying Gaussian distribution is obtained by estimation, can be also estimated. An adaptive control strategy employed track target model neural networks are used compensate for uncertainties robotic dynamics. Comparative simulation results carried out verify effectiveness emphasize advantages...

For LCL-type grid-connected inverters, inverter-side current, grid-side capacitor current and voltage are four commonly used variables in the control serving as different roles, such objective, active damping, synchronization, etc. This article builds a general admittance model, which total output is decomposed into paralleled subadmittance corresponding to above law, facilitate passivity-based stability assessment controller parameter optimization for objectives schemes. Based on passivity...

The dual-dc-port dc–ac converter-connected photovoltaic (PV)–battery hybrid systems present high-efficiency and low-cost features with single-stage power conversion as the PV unit battery are connected to grid directly. However, it is challenging achieve flexible distribution in this configuration due its coupled grid-side current tracking distribution. To deal issue, article proposes a zero-vector-regulation-based closed-loop strategy for PV–battery systems. By modeling converter an...

The frequency-domain passivity theory offers an effective way to assess the stability of inverters connecting complex grid conditions, e.g., inductive grid, capacitive and system comprising multiple inverters. In this article, admittance model for grid-side current-controlled LCL-type inverter with capacitor voltage feedforward active damping (CVF-AD) is built facilitate passivity-based assessment controller parameter design. Especially, it found that if antiresonance frequency inverter-side...

Single-stage multiport inverter (SSMI)-fed motor drives are promising solutions for multisource hybrid electric vehicles (HEVs) since the dc–dc converter is removed and all active power delivered within a single conversion stage. However, this topology presents inherent coupled issues in controller design because distribution should be achieved simultaneously addition to stator current control. To address issue, an equivalent two-level model proposed achieve decoupled control of SSMI, where...

The single-stage multiport inverter (SSMI) directly connects the hybrid energy storage system (HESS) to ac side, which presents merits of low cost and high efficiency due removal dc-dc converter. existing space vector modulation (SVM) schemes transplanted from corresponding multilevel inverters cannot achieve bidirectional active power flow for both dc ports limited degree freedom. To this end, article proposes an opposite release extra freedom allocation in SSMI. A novel two-level model...

Resonant controllers (RSCs) are widely adopted for controlling power converters, since they can track ac signals of both positive and negative sequences without steady-state error. However, the performance RSCs has not been fully exploited due to improper phase compensation angle insufficient controller gain. In this paper, a novel parameters' design method, which is based on system error transfer function, proposed further explore potential high RSCs. Comparing with conventional methods,...

Determination of genome-wide DNA methylation is significant for both basic research and drug development. As a key epigenetic modification, this biochemical process can modulate gene expression to influence the cell differentiation which possibly lead cancer. Due involuted mechanism methylation, obtaining precise prediction considerably tough challenge. Existing approaches have yielded good predictions, but methods either need combine plenty features prerequisites or deal with only...

The main contribution of this paper is the proposal a novel finite control set model predictive (MPC)-based zero-sequence circulating current (ZSCC) elimination strategy for parallel operating three-level inverters without any modification or extra hardware on inverters. An equivalent ZSCC first developed, and voltage differences common-mode voltages (CMVs) among paralleled as well those neutral point potentials (NPPs) are proved to be exciting sources ZSCC. With analysis, an MPC-based zero...

The frequency-domain passivity theory offers an effective way to assess the stability of inverters in a complex grid. In this article, unified impedance model, suitable for either inverter current control (ICC) or grid (GCC) <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCL</i> -type grid-connected with observer-based capacitor feedback active damping, is built facilitate passivity-based assessment and controller parameter design. With...

Single-stage multiport inverters (SSMIs) have been increasingly adopted in multisource systems, such as hybrid electric vehicles and renewable energy due to their salient advantages of fewer power losses, passive filters, higher system efficiency. Nowadays, SSMI topologies are mainly obtained by reforming existing multilevel converter without dedicated derivation methods, potentially leading redundant components additional which hinder the further development SSMIs. To deal with this issue,...

The frequency-domain passivity theory suggests that incorporating passive output admittance in grid-connected inverters (GCIs) can effectively mitigate system instability issues. This has been widely recognized and applied design guidelines for active damping (AD) (PD) methods tailored explicitly <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCL</i> -type GCIs. However, AD have a limitation they only reshape the of GCIs to be (with...

The multisource inverter (MSI) is a high-efficiency topology for hybrid electric vehicles due to its advanced merits of single-stage power conversion without employing dc–dc converters. However, the control scheme MSI challenging because asymmetrically distributed voltage vectors and extra objective distribution between energy sources. In view this, this article proposed modulated model predictive (M <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...