Wind power proportion limit value analytical calculation method considering frequency constraints

A technology of frequency constraints and calculation methods, applied in calculation, wind power generation, design optimization/simulation, etc., and can solve problems such as difficulty in adaptation

Active Publication Date: 2020-02-04
WUHAN UNIV
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Problems solved by technology

As the penetration rate of wind power continues to increase, the existing research methods for the limit value of wind power share have been difficult to adapt,

Method used

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  • Wind power proportion limit value analytical calculation method considering frequency constraints
  • Wind power proportion limit value analytical calculation method considering frequency constraints
  • Wind power proportion limit value analytical calculation method considering frequency constraints

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Embodiment

[0078] A method for calculating the limit value of wind power proportion considering frequency stability constraints, comprising the following steps:

[0079] 1. Treat the power supply and load in the system as equal values, construct thermal power unit models, hydroelectric unit models, load damping adjustment models, and synchronous generator rotor kinetic energy models, and obtain detailed frequency response models that reflect various physical processes. Among them, the results of power and load concentration equivalent processing are as follows.

[0080] 1.1, to model the thermal power unit, the steam turbine model can be expressed as:

[0081]

[0082] In the formula, G TT (s) is the steam turbine transfer function of the thermal power unit, ΔP T (s) is the mechanical power increment, Δδ is the valve opening increment, F HP , T RH , T CH Respectively, the ratio of the power generated by the high-pressure turbine stage (HP stage) to the total power of the steam turb...

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Abstract

The invention relates to a wind power installed capacity technology, in particular to a wind power proportion limit value analytical calculation method considering frequency constraints, which comprises the following steps of: modeling a conventional unit of a system to obtain a detailed frequency response model reflecting each physical process; performing equivalent processing on the system to obtain a power system frequency response SFR single-machine equivalent reduced-order model; calculating a wind power ratio according to the fan access capacity and the original capacity of the system, and further calculating system parameters after fan grid connection; substituting into the original single-machine equivalent reduced-order model to obtain a power system frequency response model afterfan grid connection, obtaining a frequency domain expression after system frequency deviation per unit, and calculating an expression of system frequency steady-state deviation; respectively considering the steady-state frequency deviation constraint boundary and the angular frequency change rate constraint boundary of the system to solve a wind power ratio limit value, and taking the smaller value of the two boundaries to obtain an actual wind power ratio limit value. The method is simple in solving step, reduces the calculation complexity, and has certain calculation universality.

Description

technical field [0001] The invention belongs to the technical field of wind power installed capacity, and in particular relates to an analysis and calculation method for wind power ratio limit value considering frequency constraints. Background technique [0002] Due to the obvious imbalance and regional differences in the distribution of wind energy resources and power demand, the long-distance, large-capacity large-scale development model adopted by my country's wind energy resources has led to a decline in system frequency control capabilities and an increased risk of power system frequency instability. The limit value of wind power proportion is the percentage of the maximum installed capacity of wind turbines connected to the system and the total power generation capacity of the system under the premise of representing certain technical indicators. When the proportion of wind power capacity is relatively small, the impact of the wind farm on the entire system is not ver...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06Q50/06
CPCG06Q50/06Y02E10/76
Inventor 唐飞刘涤尘卿梦琪刘福锁都念纯胡本溪
Owner WUHAN UNIV
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