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A coordinated control method for once-through boiler, steam turbine and power grid for primary frequency modulation analysis

A once-through boiler and coordinated control technology, which is applied in the coordinated control of power grids, steam turbines, and once-through boilers, can solve problems such as failure to consider boiler characteristics and unfavorable safe and stable operation of the power system, and achieve temperature fluctuation reduction, control performance improvement, and life loss Reduced effect

Inactive Publication Date: 2020-12-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problem that the existing technology does not consider the characteristics of the boiler, which brings great resistance to the participation of large-capacity and high-parameter thermal power units in primary frequency regulation, which is not conducive to the safe and stable operation of the power system, and proposes a method for primary frequency regulation analysis. Coordinated control method for once-through boilers, steam turbines, and power grids

Method used

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  • A coordinated control method for once-through boiler, steam turbine and power grid for primary frequency modulation analysis
  • A coordinated control method for once-through boiler, steam turbine and power grid for primary frequency modulation analysis
  • A coordinated control method for once-through boiler, steam turbine and power grid for primary frequency modulation analysis

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specific Embodiment approach 1

[0022] Specific embodiment one: a once-through boiler, steam turbine, power grid coordinated control method for primary frequency regulation analysis includes the following steps:

[0023] Step 1: Analyze the energy state of the once-through boiler to determine the energy state of the once-through boiler;

[0024] Step 2: Analyze the energy state of the power grid to determine the energy state of the power grid;

[0025] Step 3: According to the energy state of the once-through boiler determined in step 1 and the energy state of the grid determined in step 2, determine the grid source energy coordinated control strategy.

specific Embodiment approach 2

[0026] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the input variables and output variables of the controller are determined in the step 1 as follows:

[0027] The main steam pressure has a good linear relationship with the energy, and the main steam pressure can be used to reflect the level of the dynamic energy of the boiler. In actual operation, as long as the conversion coefficient between the two is known, the boiler energy at each moment can be known. The conversion factor is obtained at one time by installing sensors at relevant positions during the commissioning stage of the once-through boiler.

[0028] The present invention defines the energy state of the boiler according to the main steam pressure of the once-through boiler, as shown in Table 1. The upper limit of primary frequency regulation is generally 3.5% of rated power, so define ΔP tM It is the main steam pressure difference received within the time corresponding to 3.5% of...

specific Embodiment approach 3

[0035] Specific implementation mode three: the difference between this implementation mode and specific implementation mode one or two is: the determination of the energy state of the power grid in the step two is specifically:

[0036] The invention determines the energy state of the grid according to the frequency of the grid. Combined with the actual power grid data, the frequency is analyzed from the minute-level time scale and statistical perspective, and the power grid frequency fluctuation has the following conclusions (as shown in Table 2):

[0037] 1) In more time (33.2%), Δf falls within the range of [-0.01,0.01], and the grid energy is defined as "balanced".

[0038] 2) In more than half of the time (51.5%), Δf exceeds the "balance" range but does not exceed the frequency modulation dead zone, that is, it falls within ± [0.01,0.0333], which defines the power grid energy as "slightly high" or "slightly low" at this time . According to the statistical results, Δf fa...

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Abstract

The invention relates to a once-through boiler, steam turbine and power grid coordinated control method for primary frequency modulation analysis. The invention aims to solve a problem that characteristics of the boiler are not considered in the prior art so that great resistance is brought to participation of a high-capacity high-parameter thermal power generation unit in primary frequency modulation and safe and stable running of an electric power system is not facilitated. The method comprises the steps of firstly, performing once-through boiler energy state analysis so as to determine the once-through boiler energy state; secondly, performing power grid energy state analysis so as to determine the power grid energy state; and thirdly, determining a grid source energy coordinated control strategy according to the once-through boiler energy state determined in the step one and the power grid energy state determined in the step two. The once-through boiler, steam turbine and power grid coordinated control method enables the thermal power generation unit to not only sufficiently participate in frequency modulation, but also be operate safely and efficiently under the premise of meeting a requirement of safe running of a power grid. The once-through boiler, steam turbine and power grid coordinated control method is applied to the field of primary frequency modulation analysis.

Description

technical field [0001] The invention relates to a coordinating control method for a once-through boiler, a steam turbine and a power grid used for primary frequency modulation analysis. Background technique [0002] Because supercritical and ultra-supercritical units are superior to subcritical units in terms of economy, environmental protection, efficiency and capacity, supercritical and ultra-supercritical units have become the mainstream of thermal power construction in the future. The ultra-high temperature and ultra-high pressure characteristics of supercritical and ultra-supercritical units make it necessary to use once-through boilers, and once-through boilers have problems such as small heat storage, sensitivity to disturbances, and serious coupling between machines and furnaces. As intermittent energy sources such as wind power are connected to the grid, the demand for frequency regulation of the power system increases, and the power of supercritical and ultra-super...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q50/06G06Q10/04
CPCG06Q10/04G06Q50/06
Inventor 郭钰锋陈润欣石建国王琦张冬蕊马欣彤张童童
Owner HARBIN INST OF TECH
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