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Feedforward compensation design method of thermal power generating unit AGC system

A technology of feed-forward compensation and thermal power units, which is applied in general control systems, control/regulation systems, instruments, etc., can solve the problems that are difficult to meet the AGC adjustment rate, adjustment accuracy and response time at the same time, and achieve shortened response time and multi-assessment The effect of increasing the power and improving the response accuracy

Active Publication Date: 2018-05-01
哈尔滨沃华智能电力技术有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this invention is to solve the existing AGC system optimization method based on traditional control strategy design, it is difficult to meet the assessment requirements of AGC in three aspects of adjustment speed, adjustment accuracy and response time at the same time, thus proposing a front of AGC system for thermal power units Feed Compensation Design Method

Method used

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  • Feedforward compensation design method of thermal power generating unit AGC system
  • Feedforward compensation design method of thermal power generating unit AGC system
  • Feedforward compensation design method of thermal power generating unit AGC system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Complete the construction of the functional relationship and the calculation of the constants in the AGC feed-forward compensation logic of the 300MW unit through steps 1 to 3, and the calculation result is ΔP 1 =1.2,ΔP 2 = 2.8, according to image 3 The logical structure shown is designed and implemented in the unit DCS. Comparing the adjustment rate K before and after optimization 1 , Adjustment accuracy K 2 , response time K 3 , as shown in Table 1, after optimization, the adjustment rate K 1 From 1.05 to 1.23, the adjustment accuracy K 2 From 0.85 to 1.50, the response time K 3 From 0.95 to 1.51.

[0052] Generally, the calculation method of the three comprehensive adjustment performance indicators for the AGC assessment of the unit by the power grid is as follows:

[0053] Adjustment rate K 1 Indicates the degree to which the actual adjustment speed of the unit accounts for the standard speed. If the calculated value is less than 0.1, take it equal to 0.1...

Embodiment 2

[0068] Complete the construction of the functional relationship and the calculation of the constants in the AGC feed-forward compensation logic of the 200MW unit through steps 1 to 3, and the calculation result is ΔP 1 =0.7, ΔP 2 = 1.8, according to Figure 4 The logical structure shown is designed and implemented in the unit DCS. Comparing the adjustment rate K before and after optimization 1 , Adjustment accuracy K 2 , response time K 3 , as shown in Table 2, after optimization, the adjustment rate K1 increases from 0.45 to 0.91, and the adjustment accuracy K 2 From 0.95 to 1.52, the response time ratio K 3 Increased from 1.05 to 1.32.

[0069] Table 2 Comparison of parameters before and after optimization of 200MW unit

[0070] AGC performance index

Adjustment rate K 1

Adjustment accuracy K 2

Response timeK 3

before optimization

0.45

0.95

1.05

Optimized

0.91

1.52

1.32

[0071] This strategy improves the...

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Abstract

The present invention relates to a feedforward compensation design method of a thermal power generating unit AGC system, and relates to the field of thermal power generating unit AGC system control strategy. The objective of the invention is to solve the problem that a current AGC performance optimization method is difficult to improve three examination index requirements of the AGC at the same time. The method comprises the steps of: determining whether an AGC mode is input to the unit or not, if the AGC is not input into operate, allowing power signals PT transmitted to a steam turbine regulator to be still actual power signals of the unit, ending the method, and if the AGC is input into operate, executing a step 2, namely performing feedforward compensation design optimization of the power signals transmitted to the steam turbine regulator; the step 2: calculating power deviation [Delta]P0:[Delta]P0=P'-P according the current load P' and an actual load P of the AGC, calculating constants [Delta]P1, [Delta]P2:[Delta]P1=W*K1 and [Delta]P2=W*K2 by employing a unit rated load W; and the step 3: determining a size relation of a power instruction deviation [Delta]P0 and the constant [Delta]P1, and calculating corrected power signals PT by employing the constant [Delta]P2 according to a determined result, and transmitting the corrected power signals PT to the steam turbine regulator. The feedforward compensation design method of the thermal power generating unit AGC system is suitable for a thermal power generating unit AGC system.

Description

technical field [0001] The invention relates to the field of control strategies of an AGC system of a thermal power unit, in particular to a design method for feedforward compensation of the AGC system of a thermal power unit. Background technique [0002] The frequency regulation of thermal power units is divided into primary frequency regulation and secondary frequency regulation. Primary frequency regulation refers to the regulation system of the unit participating in the regulation, changing the load carried by the unit to balance it with the external load. At the same time, we also try our best to reduce the change of the grid frequency. The primary frequency modulation is a differential frequency modulation, which cannot keep the grid frequency unchanged, but can only ease the change of the grid frequency. Secondary frequency regulation is also called automatic generation control (AGC for short), which means that the power grid dispatcher adjusts the power generation o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/02
CPCG05B13/02
Inventor 孙建国姚坤王凤良高岩松李越男康剑南江飞张丽杰马志国李建华郭峃峄陈国宏刘富栋楚豫川曹勇
Owner 哈尔滨沃华智能电力技术有限公司
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