Integration of large-scale wind power had become main mode of wind-power delivery in China, however, as the weakness of grid and diversity of VAR sources, operation voltage fluctuation of powersystems integrated with...
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ISBN:
(纸本)9781479964161
Integration of large-scale wind power had become main mode of wind-power delivery in China, however, as the weakness of grid and diversity of VAR sources, operation voltage fluctuation of powersystems integrated with large-scale wind power remains to be solved. Therefore, propose a multi-time scale reactive power coordinated control strategy regarding fast continuous and slow discrete VAR sources, design a two-level coordinated voltage control model based on property of various VAR sources. The primary control level deals with operation of discrete VAR sources such as shunt capacitor and reactor based on wind power forecast to mitigate long-term substantial voltage fluctuation of pilot buses at large time scale; while the secondary control level deals with operation of continuous VAR sources such as wind turbines, SVC and SVG to mitigate small frequent voltage fluctuation of pilot buses at short time scale. Voltage fluctuation of pilot buses is effectively mitigated by two-level coordinated control strategy. The calculation on the voltage of China's grid accommodating large-scale and centralized wind power validates that the proposed method can effectively solve the problem of voltage fluctuation of pilot buses.
Wind gust has the characteristics of sudden and brief increase in wind speed. Moreover, if the penetration of wind power is high, its inherent characteristics may impacts on powersystem stability. In order to analyze...
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Wind gust has the characteristics of sudden and brief increase in wind speed. Moreover, if the penetration of wind power is high, its inherent characteristics may impacts on powersystem stability. In order to analyze the impacts of wind gust and wind penetration on wind turbine generator further the system stability, three signals to stand for wind gust types are adopted in this paper, i.e. lope signal, 1-consine discrete signal and step signal. This paper analyzes quantitatively the uncertainties of wind generated power arising from wind speed using different wind models. Then, two-area four-machine system is modified in MATLAB, where the double-fed induction wind generators are used to simulate different wind power penetration. It is shown that different types of wind models and variations wind speed have different impacts on the generated wind power of wind farm. Moreover, it can be inferred when the penetration of wind power is high, the generated wind power outputs affect powersystem stability largely.
There are a lot of uncertainties in load modeling and it parameter solutions, which is difficult to estimate uncertainty with traditional methods if the number of parameters is immense. This paper adopts the sparse gr...
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There are a lot of uncertainties in load modeling and it parameter solutions, which is difficult to estimate uncertainty with traditional methods if the number of parameters is immense. This paper adopts the sparse grid stochastic collocation method for uncertainty analysis, and proposes a strategy available to calculate the multi-parameter uncertainty arising from load models. For multiple random inputs, sparse grid method can be regarded as an extension of Gaussian quadrature formulas in multi-dimensional cases. Based on the sparse grid stochastic collocation method, the collocation points can be selected among the Gaussian points of (l+1) order and lower than (l+1) order. Compared to other probabilistic analysis methods, it can not only maintain the integral precision but avoid the exponential rise of collocation points, and can greatly reduce simulation time. The case study on multiparameter uncertainty of the composite load model verifies the integral precision and the validity of the proposed method.
The turbo-generator units in the vicinity of HVDC transmission system are vulnerable to Sub-Synchronous Torsional Interactions (SSTI). Based on the AC-DC system decoupling transfer function structure of Generator rota...
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ISBN:
(纸本)9781849197007
The turbo-generator units in the vicinity of HVDC transmission system are vulnerable to Sub-Synchronous Torsional Interactions (SSTI). Based on the AC-DC system decoupling transfer function structure of Generator rotation rate to the electric torque, a novel phase correction method of HVDC supplementary subsynchronous multiple models damping controller is proposed, and a SSDC software for adjusting and analyzing the parameters with matlab is designed. The simulation, including Hulunbier-Liaoning HVDC system in the northeast power grid in China which can arouse the SSTI, proves the feasibility and effectiveness of the method.
The turbo-generator units in the vicinity of HVDC transmission system are vulnerable to Sub-Synchronous Torsional Interactions (SSTI). Based on the AC-DC system decoupling transfer function structure of Generator rota...
The turbo-generator units in the vicinity of HVDC transmission system are vulnerable to Sub-Synchronous Torsional Interactions (SSTI). Based on the AC-DC system decoupling transfer function structure of Generator rotation rate to the electric torque, a novel phase correction method of HVDC supplementary subsynchronous multiple models damping controller is proposed, and a SSDC software for adjusting and analyzing the parameters with matlab is designed. The simulation, including Hulunbier-Liaoning HVDC system in the northeast power grid in China which can arouse the SSTI, proves the feasibility and effectiveness of the method.
Fault detection is a traditional problem in the researches of complex powersystem. Relay protection is the first line of guaranteeing the safety of large-scale electricity grid. In order to serve the backup protectio...
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The basic concepts and development of smart grid is described. The influence of large capacity wind farm interconnected on the smart grid is analyzed particularly, following contents are emphatically presented: model ...
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The basic concepts and development of smart grid is described. The influence of large capacity wind farm interconnected on the smart grid is analyzed particularly, following contents are emphatically presented: model of wind farm, basic operation performance, output forecasting of wind farm, power flow in smart grid including wind farm, balance of voltage and raeactive power, small disturbance stability, transient stability, faults and reliability, etc., in the hope of offering references for the fast development of smart grids absorbing more capacity of wind power.
The dynamic operating characteristics of direct drive permanent magnet synchronous generator (PMSG) were researched. A method of non-linear slope pre-charge for DC-bus voltage is proposed on purpose of protecting powe...
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The pulse width modulation technique and dynamic operating mode characteristics of direct drive permanent magnet synchronous generator (PMSG) are researched firstly. A novel sliding mode variable structure directed po...
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Frequency stability refers to the ability of a powersystem to maintain steady frequency following a severe system upset resulting in a significant imbalance between generation and load. The rate of frequency change (...
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