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Mechanism-based mathematic model establishing method suitable for frequency modulation analysis of multi-machine power system

A technology of electromechanical power system and mathematical model, applied in the field of mathematical model, can solve the problems of slow frequency modulation operation speed, no consideration of randomness of meteorological parameters, etc., achieve the effect of improving simulation speed and ensuring safe and stable operation

Inactive Publication Date: 2013-10-02
HARBIN INST OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the current regional power system model is used for frequency modulation analysis when the frequency modulation calculation speed is very slow and the influence of the randomness of meteorological parameters on frequency modulation is not considered. The present invention provides a multi-machine power system frequency modulation Mathematical Model Mechanism Modeling Method for Analysis

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  • Mechanism-based mathematic model establishing method suitable for frequency modulation analysis of multi-machine power system
  • Mechanism-based mathematic model establishing method suitable for frequency modulation analysis of multi-machine power system
  • Mechanism-based mathematic model establishing method suitable for frequency modulation analysis of multi-machine power system

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specific Embodiment approach 1

[0017] Specific implementation mode one: combine figure 1 Describe this embodiment, the mathematical model mechanism modeling method applicable to multi-machine power system frequency modulation analysis described in this embodiment, it includes the following steps:

[0018] Step 1: Input the air-cooling given load signal, head wind speed signal, ambient temperature signal and the deviation △ω of the system frequency of the last frequency adjustment to the air-cooling unit model, and input the thermal power given load signal and the last frequency adjustment system to the thermal power unit model The frequency deviation △ω, input the hydropower given load signal and the deviation △ω of the last frequency modulation system frequency to the hydroelectric unit model, and input the wind speed signal to the wind turbine model;

[0019] Step 2: Active power output by the air-cooling unit model Active power output by thermal power unit model Active power output by hydroelectric u...

specific Embodiment approach 2

[0031] Specific implementation mode two: combination figure 2 Describe this embodiment. This embodiment is a further limitation of the mathematical model mechanism modeling method suitable for multi-machine power system frequency modulation analysis described in the first embodiment. The modeling method of the thermal power unit model is:

[0032] The deviation of the system frequency of the last frequency modulation △ω divided by the adjustment coefficient δ 1 after Thermal power given load signal minus the Finally, it is used as the input of the transfer function of the high-pressure regulating valve and the transfer function of the medium-pressure regulating valve at the same time. The output of the transfer function of the high-pressure regulating valve is multiplied by the passage coefficient of the high-pressure main steam valve and then used as the input of the high-pressure cylinder volume equation. The high-pressure cylinder volume The output of the equation is u...

specific Embodiment approach 3

[0038] Specific implementation mode three: combination image 3 Describe this embodiment. This embodiment is a further limitation of the mathematical model mechanism modeling method suitable for multi-machine power system frequency regulation analysis described in the first embodiment. The modeling method of the air-cooling unit model is:

[0039] The deviation of the system frequency of the last frequency modulation △ω divided by the adjustment coefficient δ 2 after air-cooled given load signal minus the Finally, it is used as the input of the transfer function of the high-pressure regulating valve and the transfer function of the medium-pressure regulating valve at the same time. The output of the transfer function of the high-pressure regulating valve is multiplied by the passage coefficient of the high-pressure main steam valve and then used as the input of the high-pressure cylinder volume equation. The high-pressure cylinder volume The output of the equation is used ...

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Abstract

The invention relates to a mechanism-based mathematic model establishing method suitable for frequency modulation analysis of a multi-machine power system, which relates to a mathematic model suitable for the frequency modulation analysis of the multi-machine power system. For solving the problems that the frequency modulation computation speed is low and the influence of the randomness of meteorological parameters on frequency modulation is not considered when a regional power system model is applied to the frequency modulation analysis, the method comprises the following steps that a regional power system model including a wind power generation unit, a hydro-power generation unit, a thermal power generation unit and an air cooling unit is established, the air cooling unit model inputs environmental temperature, face velocity, preset load and frequency offset, the thermal power generation unit model inputs the preset load and the frequency offset, the hydro-power generation unit model inputs the preset load and the frequency offset, the wind power generation unit model inputs wind speed signals, all active power output by all unit models is respectively multiplied by each power share coefficient and then is superposed so that the per-unit value of unit electric energy production is obtained, the offset of system frequency is obtained by utilizing a rotor equation, and the offset is taken as the frequency offset during next frequency modulation. Therefore the mechanism-based mathematic model establishing method disclosed by the invention is applied to the frequency modulation analysis of the multi-machine power system.

Description

technical field [0001] The invention relates to a mathematical model suitable for frequency regulation analysis of multi-machine power system, in particular to a mathematical model mechanism modeling method suitable for multi-machine power system frequency regulation analysis. Background technique [0002] The frequency stability of the power system is a necessary condition to ensure the safe and stable operation of the power system. At present, the research on regional power systems is mostly used for power flow analysis. This type of model simplifies the dynamic characteristics of the units; the mathematical models for the analysis of the dynamic characteristics of frequency modulation are mostly limited to one or two types of generating units, which is different from the actual power system operation. The difference is far; there are also some mathematical models that do not distinguish the transient process from the dynamic process, resulting in very slow calculation spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 郭钰锋陈强于达仁
Owner HARBIN INST OF TECH
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