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Voltage stability has become rather important in modern power systems, the bifurcation of the adjoint system has been proposed for computing the saddle-node bifurcation point of the voltage stability. We derive the bifurcation analysis of the adjoint system, an example is given.
Buckling analysis of structures can be divided into eigenvalue buckling analysis and nonlinear buckling analysis. In this paper, the basic theory of eigenvalue buckling analysis and nonlinear buckling analysis has been described, then using ABAQUS to do eigenvalue buckling analysis and nonlinear buckling analysis on structural elements of an actual project which have prestress, and comparing their...
Based on the analysis and comparison of traditional slope treatment methods on steep rocky slopes, the construction technology, properties and advantages of Vegetation-Growing Concrete Base Material Slope-Protected Technique were recommended. It was demonstrated that this technology has good benefits and application prospects for soil and water conservation, economy and ecological construction, sustainable...
Static var compensator (SVC) and thyristor controlled series compensator (TCSC) are used to improve Transient Voltage Stability of the asynchronous wind farm in this paper. The related structure model of the wind farm power system is built in Matlab / Simulink. The contributions of SVC and TCSC to Transient Voltage Stability of the asynchronous wind farm and power grid are verified by the simulation...
A method of quantitative contribution assessment of power source in critical branch is proposed in this paper. During the various operation modes, a branch must keep its power flow within the critical boundary. A simple branch model is given to represent the overhead line, cable or transformer. The index proximity of criticality (IPC) is formulated to evaluate the severity. An electrical decomposition...
Load model has great uncertainty characteristic due to the time-variation of load. As a consequent, it is essential to analyze the influence of load model on power system stability. The effect of load model structure and parameter on Yunnan power grid transient stability is researched in this paper. Simulation results indicate that load model has great influence on Yunnan power great transient stability...
A dynamic equivalent approach based on coherency is researched for dynamic simulation test in ±800 kV DC transmission project from Yunnan to Guangdong in China. To reduce the full system, the dynamic equivalent model of large-scale power system based on coherency is established, in which the identification of coherent generator groups, coherent buses reduction, aggregation coherent generator parameters...
As power system interconnections become more prevalent, there has been an increase in use of thyristor controlled shunt connected compensation devices for dynamic power compensation and enhancement of real power transmission capacity. In this paper, an enhancement technique of real power transfer capacity of transmission lines is presented. A static var compensator (SVC) is designed and applied to...
This paper focuses on whether China's financial system still needs market-oriented transition after recent global financial crisis which hints that financial liberalization may weaken financial stability. We analyze the structure of China's financial system and highlight that current system doesn't possess the so-called advantage of dealing with fluctuation. In fact, the good economic performance...
The initial impoundment of hydropower plant leads to the zooming water level of reservoir. The seepage filed of rock mass then forms and will be a potential threat to the structural stability of tunnels neighboring the reservoir. The strength reduction method and overloading method are proposed to respectively analyze the structural stability of rock and lining structures after the initial impoundment...
This paper uses the grid-connected photovoltaic (PV) power plant electromechanical transient simulation model on FASTEST (Fast Analysis of Stability using the Extended equal area criterion and Simulation Technologies) to do the simulation of PV power plant integrated to the grid. The simulation includes the largest installed capacity of PV power plant and the response of PV power plant when solar...
The single machine infinite bus system excitation control of power system is discussed in this paper. A nonlinear equivalent sliding mode controller and adaptive sliding mode controller are designed based on the theory of sliding mode variable structure control and stability analysis is included. The proposed design approach enables to compensate the inherent nonlinearities of the generator and to...
A novel current control method based on improved repetitive control (RC) and fuzzy reasoning immune feedback for single-stage single-phase grid-connected (SSSPGC) photovoltaic (PV) system is proposed. Low-pass filter with zero-phase-shift is employed for delay part of RC to make better tradeoff between robustness and performance. Then the compensation part based on linear lead compensation function...
In this paper a method for prediction of voltage collapse point in presence of voltage dependent loads is proposed. When a part of load is voltage dependent type, the voltage collapse point does not coincide with maximum loading point and lower portion of PV curve can be stable. In the proposed method, at first this portion of PV curve is approximated with a quadratic function by some successive local...
To solve the problems of voltage fluctuation, flicker, harmonic and long distance transmission caused by offshore large scale wind farm (WF), a wind power integration scheme by using VSC-HVDC system has been proposed. The WF's voltage has kept in stable by the VSC-HVDC system's reactive power control in real time. There is little low-order harmonics and voltage fluctuation because the power has transmitted...
Dynamic security region (DSR), which describing the transient stability of power system from the parameter space, has attracted a lot of attentions. However, there are few literatures concerning the impact of generation system model on the DSR. This paper focuses on the impact of generation system model including high order model of generator, excitation system, speed governor, on DSR, based on the...
This paper proposes the application of the symplectic Runge-Kutta algorithm combined with the flexible GMRES method to solve the differential algebraic equations encountered in the power system transient stability simulation. In the proposed method, the s-stage 2s-order symplectic Runge-Kutta is used to convert the differential algebraic system in to a set of nonlinear algebraic equations, and then...
Based on analysis of the case of the saddle-node bifurcation and the limit-induced bifurcation, a new method for identifying and calculation bifurcation points in steady-state voltage stability analysis is presented. By using continuation power flow based on piecewise linear load prediction curve, in which the load increasing directions are determined by load prediction curve, it go through the collapse...
The main factors are found out for planning DC links terminating at AC system locations from the point of interactions between AC and DC systems, such as Short-Circuit Ratio (SCR), Voltage Static Indicator (VSI), and the power losses of the whole system. Based on the linear weighted summation method for multi-objective decision-making problems, a new method is proposed in this paper to select the...
Oscillating Water Column (OWC) caisson breakwater is a type of wave energy converter which use caisson chamber as OWC air chamber, the paper first introduces concept design of the structure, and then a detail designed OWC caisson is given out. A random wave experiment is carried out in laboratory, an acrylic OWC caisson model is utilized, the first part is to get random wave force on the structure,...
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