This paper presents a method for robust stability analysis of large-scale power systems based on the value set approach. The order system is first reduced by dimension reduction and modal truncation to capture oscillation modes interest. characteristic polynomial then obtained diagonal expansion, which allows structure coefficient functions be exploited. Mikhailov plot generated with ease using edge theorem mapping theorem, inspection plot, uncertainty's impact becomes transparent....

Ultra high voltage direct current transmission is the main In this paper, principle and topology of APF are compared firstly, then scheme adding designed according to phenomenon that 5th harmonic Jinhua converter station exceeds standard. The control target studied, minimum output capability calculated by mathematical formula, specific strategy based on result target. Finally, simulation model PSCAD built verify correctness strategy. results show active filter can effectively reduce low...

Abstract Rapid short-term forecasting of grid loads can realize more stable and economical load deployment control in planning operation, improve the efficiency dispatching system. In this paper, we first collect data for distribution bandwidth propose a suitable method preprocessing, summarize fluctuation law operation. Segmented linear regression analysis is carried out using unsupervised methods isometric division, isofrequency CART tree. It found that all segmented models achieve high...

Load management is being recognized as an important option for active user participation in the energy market. Traditional load methods usually require a centralized powerful control center and two-way communication network between system operators end-users. The increasing smart grids may limit their applications. In this paper, distributed solution emerging proposed. problem formulated constrained optimization aiming at maximizing overall utility of users while meeting requirement...

A new value set approach is developed to examine the robust stability analysis of power systems, such as systems with wind penetration. The has several advantages compared our previous work. It also applies D-stability problem considering damping ratio constraint for system analysis. well-known mapping theorem applied compute sets det(I - M(s)Δ), which gives a sufficient condition evaluation. To reduce conservativeness theorem, multivariable margin Km, necessary and condition, calculated...

Pumped-storage can quickly and flexibly respond to adjust the grid fluctuation keep stability because of its various functions. Besides, it is an effective power storing tool now has become largest most widely used energy storage form. Many countries configured a certain proportion pumped in network their stability. This paper introduces current development status (PSP) station some different based on own economic demands characteristics. Then evolutions pumped-storage China are focus...

PSS4B stabilizer is a multi-band received attention in recent years. The effectiveness of such depends on number factors, among them how parameters are tuned playing key role. In this case study, two common parameter tuning methods, the ideal phase curve method and residue method, used to determine PSS1A stabilizer. Simulation results 162-bus system 2383-bus reported. It concluded that can provide more flexible compensation if properly at least lead-lag blocks each branch suggested be used.

Fin stabilizers are often used at high speed of ship, however they also can produce effective lift through pitching actively low speed. The model fin stabilizer forward is proposed based on the fluid changing stabilizer's surface. Then applied to ship roll stabilization system. From simulation data, it be seen that reduced effectively by using

High penetration of wind generation into power system may jeopardize the operation without proper frequency control methodologies. This paper proposed a coordination strategy enabling farms to participate in load system. The utilizes deloading generators reserve active engage control. It is proved be stable, and can achieve fast response under operating condition changes while avoiding frequent regulation generators' pitch angles. simulation studies verify effectiveness method.

This paper proposes a modular multilevel converter (MMC) small signal modeling method based on the harmonic state space (HSS) method, which considers circulating current suppression controller in DC voltage control mode. could achieve high accuracy since it complex internal dynamic characteristics. The stability of MMC system and influence are estimated through eigenvalues analysis to improve design efficiency system. Finally, time-domain simulation is provided MATLAB/Simulink verify HSS...

This paper is devoted to the Schnakenberg model with crucial reversible reactions, under Neumann boundary conditions. Existence and uniqueness of strong solution are obtained on basis semigroup theory. It found that proposed system admits four possible positive constant steady states, explicit conditions stability, Turing instability, steady‐state bifurcation, Hopf bifurcation determined. Besides, numerical simulations given show theoretical results depict spatiotemporal patterns.

Oscillationphenomenon has been reported in modular multilevel converter-based high-voltage DC (MMC-HVDC) transmission system. Many methods have proposed to suppress the oscillation and improve system stability, however, few papers analyzed influence of stabilization control on MMC impedance analytically. Impedance model considering additional is derived this paper. Based model, are studied, an optimal design method for controller parameters strategy maximize phase margin MMC-HVDC...

With a large number of wind farms integrated into power systems, the load characteristics systems will vary, resulting in inapplicability traditional model. Thus, it is great importance to describe by taking impact integration consideration. This paper first discusses influence on original Wind speed, which has most direct output turbine, introduced as new variable for modelling. By combing voltage variation system, static equivalent model proposed this paper, wherein, structure also...

This paper presents an AC impedance modeling method of modular multilevel converter (MMC) considering different control modes, and its accuracy is verified by simulation. Then the similarities differences MMC model under modes are compared. It indicates that low frequency characteristics significantly high basically same modes. When studying oscillation (or stability) MMC-HVDC, outer loop cannot be ignored; can simplified to current inner-loop when stability, which much simpler but still...

In order to improve the digital level of design electric power engineering and ensure accuracy reliability, this paper proposes an intelligent secretary. It clarifies construction ideas applications secretary from three aspects: architecture, functions business services. services, for first time application feature learning based on Auto-encoder design. Then, parameters learned by are trained through BP neural network get values that meet standards. Furthermore, constructs loss function...

Zhangbei Project is the first VSC-HVDC grid in world. Also, project has highest voltage and biggest capacity. Control protection system directly determines operation characteristics of grid. It greatly significant for improving dc performance ensuring safety Special requirement control studied, architecture function configuration are presented. Firstly, considering grid, several key functions systematically put forward, including start-stop converter etc. Corresponding analysis research...

In the absence of a three-phase power source, single-phase operation induction motor used source had certain practical significance. this paper, utilized symmetrical component method analysed asymmetric circuit system motor, will be voltage and current stator windings decomposed into positive, negative zero sequence three groups components. The theory is analyzed formula deduced capacitor phase shift method, solved problem starting torque, proposed to add capacitors optimal value capacitor....

Inappropriate parameter tuning of under excitation limiter (UEL) will weaken system damping, and even lead to instability, which is attributed two reasons according the theoretical analysis. Firstly, UEL with inappropriate parameters provides a negative damping torque and, secondly frequency bond incoordinate that power stabilizer (PSS). Further, single-machine infinity bus based on PSS/E MATLAB established conclusion analysis verified. Result shows that, if lower action gets smaller slope...

This paper proposes a simple method to establish the dc impedance of MMC with passive circulating current suppressing circuit (PCCSC) by analyzing flow path common mode and differential components arm currents small signal harmonics. It turns out that there exists two resonance points in magnitude-frequency characteristic curves impedance, one peak fixed at second-order frequency valley whose is related electrical parameters PCCSC. There also exist corresponding phase steps phase-frequency...