Analyzing method for damping torque having small interfering stable influence on power system caused by wind power integration

A small-disturbance and stable power system technology, applied in wind power generation, single-net parallel feeding arrangement, etc., can solve problems such as lack of safe and stable operation

Inactive Publication Date: 2013-04-17
杜文娟
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is still a lack of systematic research on the interaction between wind turbines and the power system, especially the impact of large-capacity wind farms connected to the actual large power grid on the safe and stable operation of the power system.

Method used

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  • Analyzing method for damping torque having small interfering stable influence on power system caused by wind power integration
  • Analyzing method for damping torque having small interfering stable influence on power system caused by wind power integration
  • Analyzing method for damping torque having small interfering stable influence on power system caused by wind power integration

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Embodiment

[0066] Example: as attached Figure 4 As shown, the power system is a three-machine nine-node model plus a doubly-fed fan, through Figure 4 The shown power system illustrates the specific implementation process of the damping torque analysis method of the large-scale wind farm grid-connected proposed by the present invention on the influence of the small disturbance stability of the power system; Effect of fan connection on specified oscillation modes.

[0067] The parameters of the power system of the three-machine nine-node model are:

[0068] Synchronous generator:

[0069] Moment of inertia (p.u.): H 1 =23.6,H 2 =6.4,H 3 =3.01

[0070] Motor damping torque coefficient (p.u.): D 1 =D 2 =D 3 =0

[0071] Direct axis transient open circuit time constant (s): T d01 '=8.96s,T d02 '=6.0s,T d03 '=5.89s

[0072] Direct axis unsaturated synchronous reactance (p.u.): x d1 =0.1460,x d2 =0.8958,x d3 =1.3130

[0073] Quadrature axis unsaturated synchronous reactance (...

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Abstract

The invention discloses an analyzing method for a damping torque having a small interfering stable influence on a power system caused by wind power integration. The method comprises the following steps: performing depreciating treatment on a system linear matrix containing no fan set and a system linear matrix containing an appointed fan set, thereby obtaining a damping torque matrix provided by a generator before and after the fan is added, and then calculating a participating factor of each generator corresponding to an appointed vibration mode, thereby obtaining the influence of the accessing of a wind fan on the appointed vibration mode. The analyzing method can be utilized to clearly and detailedly give out how the appointed fan influences the electromechanical vibration mode of an appointed power system through each synchronous generator, so that a physical significance guidance is supplied to the small interfering vibrating stability analysis for the power system connected with the fan, the selection and the control design for a fan mounting place.

Description

technical field [0001] The invention relates to a wind power system, in particular to a damping torque analysis method for the influence of wind power grid-connected on the small disturbance stability of the power system. Background technique [0002] Wind power is developing rapidly in my country due to its non-polluting, renewable and abundant storage advantages. With the deepening of wind power research and the advancement of technology, the capacity of wind turbines has been increasing, and more and more large and medium-sized wind farms have been built and put into grid operation. Due to the continuous expansion of scale, the impact of wind farms on the power grid has developed from simple local voltage fluctuations, harmonic pollution and other power quality issues to power grid security and stability, frequency and peak regulation, and economic dispatch. Reliability Research" ("Chinese Journal of Electrical Engineering" 2005, 10th issue), "Introduction to foreign win...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/76
Inventor 杜文娟李海峰陈中
Owner 杜文娟
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