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Transient stability analysis method for power system containing wind power and pumped storage power station

A pumped-storage power station, transient stability analysis technology, applied in wind power generation, energy storage, electrical components, etc. Quantitatively evaluate the problems of calculation speed and poor adaptability of the system model to achieve the effect of improving transient stability, reducing the amount of transient situational energy change, and having strong applicability

Pending Publication Date: 2021-10-15
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology

The numerical simulation method cannot make a quantitative evaluation of the system stability and the calculation speed is slow; the direct method has poor adaptability to the system model; the quantitative analysis made by the existing energy function method has a large deviation and the analysis accuracy is low
So far, there have been no literature reports and practical applications on transient stability analysis methods for power systems including wind power and pumped storage power stations

Method used

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  • Transient stability analysis method for power system containing wind power and pumped storage power station
  • Transient stability analysis method for power system containing wind power and pumped storage power station
  • Transient stability analysis method for power system containing wind power and pumped storage power station

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Embodiment Construction

[0032] The present invention will be further described below using the accompanying drawings and examples.

[0033] A method for analyzing the transient stability of a power system including wind power and pumped storage power stations according to the present invention comprises the following contents:

[0034] 1) Establish the energy function of the system including wind power and pumped storage power station

[0035] The transient energy function of a stand-alone infinite system is expressed as formula (1):

[0036]

[0037] Among them, V is the transient energy of the system at any time t after the accident, V KE is the transient kinetic energy, V PE is the transient potential energy, M i is the moment of inertia of the i-th generator, ω i Indicates the angular velocity of the i-th generator, ω N Expressed as the rated speed of the system reference machine, ω k (u) is expressed as the angular velocity difference between the two ends of the kth branch, t c is the ...

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Abstract

The invention relates to a transient stability analysis method for a power system containing a wind power and pumped storage power station, and the method is characterized in that the method comprises the following steps: establishing an energy function containing the wind power and pumped storage power station and establishing a mathematical model of a pump turbine system; selecting a fragile cut set by utilizing branch potential energy, analyzing the influence of the pumped storage unit working in two different states of power generation and electric power on the transient stability of the system, and verifying an analysis result through simulation, so an energy function containing a wind power and pumped storage power station can be used for analyzing the transient stability of the system. The method has the advantages of being scientific and reasonable, high in applicability, accurate in analysis and good in effect.

Description

technical field [0001] The invention relates to the technical field of transient stability analysis of wind power and pumped storage power stations, and relates to a transient stability analysis method for power systems of wind power and pumped storage power stations. Background technique [0002] The installed capacity of wind power in the power system continues to increase, and the volatility and randomness of wind power will exacerbate the imbalance of active power in the system. Wind power mostly uses double-fed induction motors to connect to the grid, which will reduce the overall inertia of the system compared with traditional generators. It brings many problems to the stability of the power system. The pumped storage unit has the advantages of quick response and flexible operation, and can effectively balance the fluctuation of new energy generation such as wind power. [0003] Existing analysis methods for power system transient stability include: numerical simulati...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/28H02J3/38
CPCH02J3/00H02J3/28H02J3/381H02J2203/20H02J2203/10H02J2300/28H02J2300/20H02J2300/40Y02E70/30Y02E10/76
Inventor 罗远翔李鑫明陈秀华王宇航范立东关明
Owner NORTHEAST DIANLI UNIVERSITY
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