Dispatching method for overcoming current unbalance of wind power grid-connected system

A technology of system power flow and scheduling method, applied in the field of wind power, can solve the problem of unbalanced power flow of wind power grid-connected system

Inactive Publication Date: 2014-08-27
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies in the existing technology and provide a dispatching method to solve the unbalanced power flow of wind power grid-connected system, the impact of wind power fluctuation on the power grid can be reduced as much as

Method used

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  • Dispatching method for overcoming current unbalance of wind power grid-connected system
  • Dispatching method for overcoming current unbalance of wind power grid-connected system
  • Dispatching method for overcoming current unbalance of wind power grid-connected system

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Embodiment 1

[0064] Taking the improved New England 10-machine 39-node test system as an example, the method of the present invention is used for optimal scheduling. Node 31 is a balance node. The wind farms are respectively connected to nodes 32, 33 and 35, and the installed capacity is 5.0p.u. The parameters of the 10 conventional units are shown in Table 1. Install the same type of ESS in 3 wind farms, with a capacity of 5.0p.u. The maximum charging and discharging power is 1.5p.u.h -1 and 3.0p.u.h -1 . ESS

[0065] The comprehensive charge and discharge efficiency is 95%.

[0066] Table 1 Conventional Unit Parameters

[0067] unit

30

31

32

33

34

35

36

37

38

39

Active upper limit / p.u.

3

5

4

3

6

5

3

5

5

6

Active lower limit / p.u.

0.9

1.5

1.2

0.9

1.8

1.5

0.9

1.5

1.5

1.8

Upper limit of climbing rate / p.u.·h -1

0.6

0.6

0.6 ...

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Abstract

The invention discloses a dispatching method for overcoming current unbalance of a wind power grid-connected system. A TCSC is considered in electric power system dispatching, a bi-layer planning theory is introduced, the full-grid current balance degree in a dispatching period serves as an optimization objective of an upper-layer model, contributions of a conventional unit serve as a control measure, and the balance, the safety and the stability of current distribution of an overall grid are guaranteed; the key cross section current balance degree in the dispatching period serves as an optimization objective of a lower-layer model, and the ESS charging-discharging power and the TCSC serve as control measures so that the balance of current distribution of key cross sections can be guaranteed. The balance of the current is overall and locally guaranteed through coordinated control of the contributions of the conventional unit, the ESS charging-discharging power and the TCSC, the current disturbance problem caused by wind power fluctuation is well solved, the safety of the system can be improved, current distribution of the system can be optimized, current fluctuation of a line can be reduced, a safe and stable state of the overall grid is strengthened, and the requirements of system operation dispatching are met.

Description

technical field [0001] The invention relates to the technical field of wind power, in particular to a scheduling method for a wind power grid-connected system. Background technique [0002] Wind power is random and intermittent, and with the increasing penetration of wind power, it brings new challenges to the operation of the power system. For regional power grids, wind power is connected to the grid through multiple centralized access points. When the penetration rate of wind power is high, wind power disturbed by multiple points may not have a great impact on the overall active power balance of the grid, but it will cause Significant changes in power flow distribution will bring about new system security issues, mainly in the following two points: First, fluctuations in the output of high-permeability wind farms will cause large-scale changes in power at the access points, which will cause wind power access to the system. The section and the key section of wind power tra...

Claims

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Application Information

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IPC IPC(8): H02J3/46
CPCY02E10/763Y02E40/14Y02E10/76Y02E40/10
Inventor 陈中丁楠
Owner SOUTHEAST UNIV
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