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Simplified calculation method and device for long-process frequency response of a power system

A frequency response, power system technology, applied in computing, complex mathematical operations, electrical digital data processing and other directions, can solve problems such as large amount of calculation, less consideration of boiler dynamic process, poor accuracy, etc.

Active Publication Date: 2019-04-19
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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  • Abstract
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  • Application Information

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Problems solved by technology

[0007] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a simplified calculation method and device for the long-term frequency response of the power system considering the dynamics of the boiler, aiming at solving the current The power system frequency calculation relies on transient simulation, and the transient simulation software does not consider the medium and long-term boiler dynamic process, and the frequency calculation method based on transient simulation has the defects of large amount of calculation, inaccurate model, and poor accuracy. question

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specific Embodiment 1

[0082] Such as figure 1 with Figure 8 As shown, the embodiment of the present invention provides a simplified calculation method for the long-term frequency response of the power system considering the dynamics of the boiler, including:

[0083] Test step S101, conduct a disturbance test on the power system and record the test data;

[0084] Simplify step S102, establish a simplified frequency response model of each synchronous generator prime mover and speed governor;

[0085] Identification step S103, according to the test data, using the least squares method to identify the parameters of the simplified frequency response model;

[0086] Equivalent step S104, according to the simplified frequency response model after identification, solve the single-machine equivalent frequency response model of the multi-machine power system;

[0087] In the checking step S105, the long-process frequency response calculation check is performed on the single-machine equivalent frequency ...

specific Embodiment 2

[0123] Such as Figure 9 As shown, the embodiment of the present invention provides a simplified calculation device for the long-term frequency response of the power system considering the dynamics of the boiler, including:

[0124] The test module 201 is used to perform a disturbance test on the power system and record test data;

[0125] The simplified module 202 is used to establish a simplified frequency response model of each synchronous generator prime mover and speed governor;

[0126] The identification module 203 is used to identify the parameters of the simplified frequency response model by using the least squares method according to the test data;

[0127] The equivalent module 204 is used to solve the single-machine equivalent frequency response model of the multi-machine power system according to the identified simplified frequency response model;

[0128] The checking module 205 is used to check the long-process frequency response calculation of the single-mac...

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Abstract

The invention discloses a simplified calculation method and device for long-process frequency response of a power system. The method comprises the following steps of obtaining dynamic response data ofthe power system through a disturbance test or historical observation data; identifying a simplified model of the prime mover and speed regulator part of each synchronous generator according to the actually measured frequency response curve and the output mechanical power change curve; wherein a multi-machine system is equivalent to a single-machine equivalent system, the long-process frequency response of a power system is calculated, and the defects that accurate parameters of all links of the system cannot be obtained, the calculated amount is large and the calculation precision is poor inan existing method are overcome. The frequency domain simplified model of the prime motor and the speed regulator are optimized and identified through a least square method, the dynamic state of a boiler and a control system of the boiler is considered, the precision of the model is improved, and the order of the model is reduced; A multi-machine power system is equivalent to a single-machine equivalent model, so that the scale of the solved problem is reduced, the calculation amount is reduced, and the calculation speed is increased; Reference is provided for frequency analysis and safe andstable control of a power system.

Description

technical field [0001] The invention relates to the technical field of power system frequency analysis, in particular to a method and device for simplifying the calculation of the long-process frequency response of the power system in consideration of boiler dynamics. Background technique [0002] Frequency is an important parameter of the power system. Accurately calculating the frequency response of the power system is of great significance for optimizing the control scheme and ensuring the safety and stability of the system. [0003] Most of the existing power system frequency response analysis relies on transient simulation calculations, but transient simulation software generally assumes that the mechanical power of the prime mover is constant, and this assumption is established within the transient response time of about 10 seconds, but when the disturbance is large , the dynamic process will last for tens of seconds to several minutes. At this time, due to the change ...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06F17/15G06F17/16
CPCG06F17/15G06F17/16G06F30/20
Inventor 张振安李晓萌方舟赵华饶宇飞刘阳赵阳王骅李峰周海强徐鹏毛文博潘玲玲王刚於益军
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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