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Electric power system unit combination optimization method considering wind turbine generator frequency modulation control

A combination technology of wind turbines and units, applied in the field of electric power systems, can solve the problems of system failure, inertia support, and wind turbines without primary frequency regulation capability, and achieve the effects of increasing the proportion, reducing the burden of frequency regulation, and improving wind power consumption capacity

Pending Publication Date: 2021-05-14
JILIN PROVINCE ELECTRIC POWER RES INST OF JILIN ELECTRIC POWER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In previous studies on the combination of wind power grid-connected units, the wind turbines were treated as having no primary frequency regulation capability and not being able to provide inertial support for the system.

Method used

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  • Electric power system unit combination optimization method considering wind turbine generator frequency modulation control
  • Electric power system unit combination optimization method considering wind turbine generator frequency modulation control
  • Electric power system unit combination optimization method considering wind turbine generator frequency modulation control

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Embodiment 1

[0054] In order to verify that the model and method proposed in this patent can improve the dynamic frequency of the system, the Matlab software platform is used to build a 10-machine system including wind power grid connection, and the CPLEX12.1 solver is used to optimize the calculation of the objective function. Load damping coefficient D = 1, TR = 8s. The dispatch cycle is 24 hours, and the load curve and wind power maximum output curve within 24 hours are as follows: figure 1 shown. The basic frequency of the example system is 50Hz, and the safe frequency limit is 49.2Hz. It is assumed that the disturbance is a sudden increase of 10% of the load of the system.

[0055] Take the following three unit combination schemes and compare the results:

[0056] Scheme 1): A unit combination scheme that includes conventional constraints (2)-(10) and does not contain system frequency constraints, and the result is denoted as R-1.

[0057] Scheme 2): System frequency constraint for...

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Abstract

The invention discloses an electric power system unit combination optimization method considering wind turbine generator frequency modulation control, and belongs to the field of electric power systems. According to the method, overspeed load shedding and virtual inertia control are adopted for a wind turbine generator, and fan frequency modulation factors are taken into consideration in dynamic frequency constraint power system unit combination strategy research. When the combination mode under the conventional constraint of a thermal power generating unit does not meet the frequency limit value requirement, the fan can be controlled within a fan load shedding constraint range, so that the wind turbine generator has the frequency modulation capability, and the system inertia is improved.

Description

technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a strategy optimization of unit combination in electric power systems. Background technique [0002] With the popularization of wind power generation technology, the proportion of wind power generation in the power system continues to increase. According to the data, as of September 2019, my country's cumulative grid-connected installed capacity reached 198 million kilowatts, accounting for 9.7% of the total generator capacity. While the grid connection of large-scale wind turbines brings huge economic and environmental benefits, since the wind turbines are connected to the grid through power electronic converters, and the converters separate the rotational kinetic energy of the wind turbines from the system, the increase in wind power penetration results in a reduction in system inertia , the system will face the challenge of safe and stable operation. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/46H02J3/24
CPCH02J3/381H02J3/466H02J3/241H02J2300/28H02J2203/20Y02E10/76
Inventor 李德鑫张海锋杨德友王博吕项羽高僮刘畅王伟姜栋潇张懿夫
Owner JILIN PROVINCE ELECTRIC POWER RES INST OF JILIN ELECTRIC POWER CO LTD
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