With the increase of various loads connected to low-voltage distribution system, difficulty identifying series fault arcs has greatly increased, which seriously threatens electricity safety. Aiming at such problems, a neural network algorithm based on multi-feature fusion is proposed. The current characteristics randomness, high frequency noise, and singularity. A GA-BP model built, wavelet analysis method (based singularity), Fourier transform noise), cycle difference randomness),...

To combat energy shortage, the multi-energy system has gained increasing interest in contemporary society. In order to fully utilize adjustable resources on demand side and reduce interactive compensation, this paper presents an integrated response (IDR) model consideration of conventional load-shedding novel resource-shifting, due fact that participants IDR can use more abundant consumption energy. proposed IDR, cooling, heating, electricity, gas so forth are considered, which takes...

When a single-phase grounding fault occurs in resonant system, the determination of location remains significant challenge due to small current and instability arc. In order solve problem low protection sensitivity when high-resistance this paper proposes method based on combination dynamic time warping (DTW) distance fuzzy C-means (FCM) clustering. By analyzing characteristics zero-sequence upstream downstream point it is concluded that waveform similarity both sides low. DTW can be used...

Direct current (DC) bus voltage stability is essential for the stable and reliable operation of a DC system. If an oscillation source can be quickly accurately localized, adequately eliminated. We propose method based on power spectral density identifying source. Specifically, distribution network model combined with component connection developed, separated into multiple modules. Compared conventional method, proposed does not require determining parameters entire grid, which typically...

Accurate estimations of the temperature and state-of-charge (SOC) are extreme importance for safety lithium-ion battery operation. Traditional SOC estimation methods often omit relation between SOC, which may lead to significant errors in estimations. This study presents a coupled electrothermal model coestimation method simultaneously estimating batteries. The is performed by model-based dual extended Kalman filter (DEKF). estimators utilizing electrochemical impedance spectroscopy (EIS)...

The power distribution network business gradually extends from the grid domain to social service domain, and new keeps expanding. edge device uses microservice architecture container technology realize processing of different services by one physical device. Although IoT with cloud-edge has good scalability, scenarios insufficient resources for devices may occur. In order support scheduling collaborative tasks under resource-constrained scenario device, this paper proposes a online method...

Abstract Neutral non‐effectively grounded mode is widely used in medium‐voltage distribution networks China. When a single‐phase grounding fault occurs networks, abundant transient signals will be generated. Here, location method based on improved Hausdorff distance proposed with zero‐sequence current and voltage of bus. First, according to the impedance characteristic analysis network, selected frequency band (SFB) determined, SFB are extracted by digital filter. Second, projection...

This article proposes a state‐of‐charge (SOC) estimation method to eliminate the influence of hysteresis effect and ambient temperature. First, an improved dual‐polarization (DP) model considering temperature is established. A voltage source connected in series with couple resistance–capacitance pairs DP model, all parameters which are related depict characteristics battery. Second, forgetting factor recursive least squares utilized identify under battery dynamic test data at different...

ABSTRACTThe machining quality of workpieces is greatly influenced by the performance an equipment. Furthermore, it difficult to establish error tracing model with high accuracy using a mathematical method. In this study, gear hubs for automobile synchronizer produced on intelligent manufacturing line was evaluated. The main sources errors were analyzed, and hub established through back propagation (BP) neural network. To improve model, weights thresholds BP network optimized mind...

Abstract When a high impedance fault (HIF) occurs in resonant grounding system, the electrical signal is weak and current distinction between faulty feeder non-faulty inconspicuous. To address this issue, paper proposes selection method based on discrete Fréchet distance (DFD). Firstly, instantaneous value of zero-sequence flowing through each sampling point, along with values at its previous moment, accumulated to enhance signal, furthermore magnify amplitude waveforms feeder. Then, DFD for...

Abstract Addressing the issue of misoperation in traditional three-zone current protection caused by assisted, drawdown, or reverse due to large-scale integration distributed generation (DG) into distribution networks (DNs), an adaptive short-circuit scheme based on local information is proposed for active (ADNs). Firstly, reliability coefficients are improved setting zones I and II lines ANDs. On DG side, coefficient constructed using e-exponential function. Subsequently, distance between...

The fact of a dominant resonance frequency existed in the transient process short-circuit fault is discovered by analyzing characteristics single-phase earthed fault. At this frequency, amplitude zero modal current faulty feeder much larger than that healthy feeder, and their polarity approximately opposite. Transient 90deg lagged behind voltage bus bar, while for it leading bar. Vast simulations under diverse conditions have been done using ATP program. signal extracted based on Prony...

In this paper, the Nyquist admittance ratio criterion was used to analyse influencing factors on stability of system, such as parameters DC line, intensity interconnected AC power grid, droop coefficient and etc. The theoretical analysis showed that increase line resistance would decrease system margin, while inductance had small effect margin; weaker gird was, smaller margin larger was. case were same, under U dc -I control mode than -P mode. According these factors, suggestions given...

With the high penetrated photovoltaics (PVs) accessing distribution networks (DNs) in future, overvoltage of network will be more serious, and voltage control complex. To solve this problem, a cluster partition-based zonal method for DN is proposed study. First, partition using comprehensive performance index proposed: terms structure, global density quality function introduced to measure coupling degree nodes clusters. In function, inconsistency coefficient presented reflect PV output...

The effect of all different kinds feeder automation on power supply reliability is analyzed. Specific method evaluating scheme using net profit rate investment expounded from the view practical engineering in this paper. city H analyzed and calculated. improved production electricity ratio used to calculate loss outage reduced by implementing automation. economy types sections compared, optimal schemes are given. results studies certain reference significance for distribution network plan.

A dominant resonance frequency is discovered in the transient process of single-phase earthed fault based on Prony algorithm. At this frequency, magnitude zero modal current faulty feeder much larger than that healthy feeder, and their phase approximately opposite. novel selection method algorithm presented paper, which determines by comparing Dominant (DTF) feeder. That is, if a opposite to any other then selected as feeder; there no obvious difference among all feeders, point bus bar. It...

The algorithm for obtaining the discrete response of popagation function frequency dependent parameter line is presented. Consider a minimum sampling period Tsm, that is, highest fH=1/(2Tsm) in signal taken into account. impedance z(w) and admittance y(w) are obtained range [0,fH] by employing Carson’s formula. propagation at each point subsequently obtained, impulse time domain then using Poision Sum Formula. In order to avoid long length reponse under higher frequency, poles zeros z...

This paper attempts to consolidate the theoretical foundation of relaxation labeling processes, explore connections between model and Hopfield associative memory model, seek for their unification. We start by defining a new assignment space then formulating process as dynamic system Lyapunov type, which is equipped with well defined energy function described naturally fitted updating rule. present consistency condition show each /spl omega/-limit point gives consistent labeling. finally make...

DC distribution system has become an important direction in improving the stability and reliability of power system. Based on research oscillation mechanism frequency characteristics voltage, a control method with variable droop coefficient is proposed to solve voltage problem under control. The result differential operation used by comparator counter compare threshold judge whether bus oscillates or not. calculated change adaptively based obtained analytical expression between coefficient....

The development of 'double-high (high-proportion clean energy and high-proportion power electronic devices) grid is getting faster faster. It has become a trend for series-type equipment to connect the distribution network. Whether transient characteristics single-phase grounding faults have certain impact in systems, whether existing line selection methods continue be applied, these issues need resolved urgently. This paper studies influence connection series UPQC (Unified Power Quality...