The droop control is an advantageous approach for stand-alone supply systems consisting of multiple batteries, allowing among various inverters without intercommunication. coefficients batteries always vary with their state-of-charge (SoC) and charge/discharge mode, resulting in small-signal instability. Nevertheless, the existing impedance-based approaches can only assess stability point, but not region. Therefore, this article proposes a region analysis approach. First, SoC-based...

The zero-sequence loop inherently exists in the structure of three-phase open-end winding permanent-magnet synchronous machine (OW-PMSM) system with common dc bus, which provides circulating path for current (ZSC) and consequently causes torque ripple extra loss. Besides, common-mode voltage (CMV), can cause many negative effects, such as bearing failure motor bearing, is another concern driving system. However, simultaneous suppression ZSC CMV control devices investigated mainly application...

Torque ripple caused by zero-sequence current (ZSC) and relatively high switching frequency severely worsens the operating performance of an open-winding permanent-magnet synchronous machine (OW-PMSM) system with common dc bus. In this paper, a novel q-axis injection method based on angle-shift-based voltage distribution is proposed for OW-PMSM With method, torque ZSC can be counteracted component generated injected current. Meanwhile, corresponding modulation range analyzed to investigate...

Zero-sequence current (ZSC) is inevitable in the structure of an open-end winding permanent-magnet synchronous machine (OW-PMSM) system with a common dc bus due to simultaneous existence ZSC loop and zero-sequence voltage (ZSV) caused by inverters third electromotive force. To suppress ZSC, novel strategy reduced switching frequency proposed this paper. The main contribution method that suppressed totally frequency. duration time active vectors redistributed generate reference loop, which...

This letter proposes a simplified modulation strategy for the open-end winding permanent-magnet synchronous motor (OW-PMSM) system with common dc bus under open-phase fault condition, suppression of circulating current. Based on analysis voltage distribution OW-PMSM fault, phase-shifted stationary coordinate is proposed and applied to synthesize reference voltage. In process, duration time two selected orthogonal vectors directly obtained both sector identification calculation trigonometric...

Inter-turn short circuit (ITSC) is a common fault in electrical machines, which may result further devastation to the whole winding and magnets. In this article, method for real-time residual insulation capacity monitoring of ITSC permanent magnet synchronous machines (PMSMs) proposed, robust speed/torque variation independent machine parameters extra sensors. It based on theory that initiates as an deterioration among adjacent turns severity can be described by being relevant 2nd harmonic...

Due to the application of dual inverters in structure open-end winding permanent-magnet synchronous machine system with isolated dc bus, double number switching devices are employed and thus actions within one pulsewidth modulation (PWM) period relatively high. To reduce actions, an improved technique is proposed this letter. In technique, reference voltages coordinate transferred three-phase stationary frame through Park transformation duration time corresponding windings can be directly...

Distributed renewable energy source is an advisable solution for dc microgrids to reduce fuel consumption and CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> emission. In such microgrids, the installation of two or more battery storage (BES) units utilized compensate power imbalance between sources loads. Nevertheless, management with numerous BES does not simultaneously consider impacts distributed generators (DGs) constant loads...

A novel sensorless drive strategy with lower switching frequency for open-end winding permanent magnet synchronous machine (OW-PMSM) common dc voltage is proposed. The reference of two inverters distributed into voltages same amplitude and 120° electrical angle shift so that the disturbance converters on zero-sequence current (ZSC) can be avoided. Based that, position information extracted by proposed method extraction. Meanwhile, a torque controller introduced to suppress ripple component...

Accurate topological connectivity is critical for the safe operation and management of low-voltage distribution grids (LVDGs). However, due to complexity structure lack measurement equipment, obtaining maintaining these connections has become a challenge. This paper proposes topology identification strategy LVDGs based on feature-enhanced graph attention network (F-GAT). First, LVDG represented as using data collected from intelligent terminals, with feature matrix encoding basic information...

The high penetration of renewable energy sources always leads to the fluctuation droop coefficients which are designed in inverse proportion their rated capacity, and power electronics devices prone static instability. Although impedance-based approaches have been widely studied deal with this problem, stability-oriented region identification due is not provided. Thus, article proposes an approach assess stability system consisting numerous distributed generators (DGs). First, modified phase...

Since one phase of discontinuous space vector pulsewidth modulation (DSVPWM) is always clamped, the inverter nonlinearity induces obvious third and sixth harmonics in <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">dq</i> -axis currents voltages. Besides, there are non-negligible spiky switching permanent magnet synchronous machine (PMSM) drives PWM-controlled with fixed frequency. To solve these issues, an harmonic suppression strategy for...

In view of the difficulties in optimal dispatch caused by diverse energy and various types equipment regional integrated system(RIES), this paper established a generalized storage model extracting flexibility characteristics cooling, heat, electrical load based on abstract equivalence. Instead reducing accuracy regulation, modeling method can greatly simplify information interaction between dispatching center consumers, thus cutting down time collaborative analysis calculations. With...

We propose a novel linear discriminant analysis (LDA) approach for the classification of high-dimensional matrix-valued data that commonly arises from imaging studies. Motivated by equivalence conventional LDA and ordinary least squares, we consider an efficient nuclear norm penalized regression encourages low-rank structure. Theoretical properties including nonasymptotic risk bound rank consistency result are established. Simulation studies application to electroencephalography show...

With the rapid development of renewable energy, microgrids are becoming more and essential in distribution networks. However, uncertainties brought by new energy sources have posed great challenges to safety stability networks, especially process fault restoration. To address these issues, this paper investigates an emergency power supply recovery strategy for networks considering support capability high-dimensional dynamic correlations uncertainty. Firstly, structure including is analyzed....