Dynamic primary thermal power generating unit frequency modulation control method for power grid with high wind power penetration rate

A technology of thermal power units and control methods, applied in the direction of reducing/preventing power oscillation, etc., can solve problems such as frequency stability and adverse effects of fluctuating systems, and achieve the effect of enhancing regulation ability and weakening effects

Inactive Publication Date: 2017-02-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the shortcomings of the existing wind power output power fluctuations that adversely affect the system frequency stability, and propose a dynamic primary frequency modulation control method for thermal power units used in high wind power penetration power grids

Method used

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  • Dynamic primary thermal power generating unit frequency modulation control method for power grid with high wind power penetration rate
  • Dynamic primary thermal power generating unit frequency modulation control method for power grid with high wind power penetration rate
  • Dynamic primary thermal power generating unit frequency modulation control method for power grid with high wind power penetration rate

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Experimental program
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specific Embodiment approach 1

[0024] Specific implementation mode one: as figure 1 As shown, a dynamic primary frequency regulation control method for thermal power units used in high wind power grids includes the following steps:

[0025] Step 1: According to the type of thermal power unit, determine the open-loop transfer function G(s) of the speed control system, draw the open-loop logarithmic amplitude-frequency characteristic and phase-frequency characteristic diagram of the speed control system according to G(s), and obtain When δ=0.02, the frequency ω corresponding to the place where the amplitude-frequency characteristic curve of the speed control system exceeds 0dB c And the maximum low frequency range of the speed control system is 0~f Lmax , where f Lmax It is the corresponding frequency when the logarithmic phase-frequency characteristic curve of the speed control system is equal to -110°;

[0026] Step 2: Use the first-order frequency divider to perform frequency division processing on the ...

specific Embodiment approach 2

[0031] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the open-loop transfer function G(s) in the step one is specifically:

[0032] When the thermal power unit is a condensing steam turbine unit, according to figure 2 The open-loop transfer function G(s) of the condensing speed control system can be obtained as follows:

[0033] Condensing type:

[0034]

[0035] where the T s is the time constant of the oil motor, T 0 is the time constant of the volume equation, T a is the generator rotor time constant, s=jω, j is an imaginary number, and ω is the angular frequency.

[0036] According to G(s), draw the open-loop logarithmic amplitude-frequency characteristics and phase-frequency characteristics of the speed control system when δ=0.02 and δ=0.05, as shown in image 3 and Figure 4 shown, based on image 3 and Figure 4 From the open-loop logarithmic frequency characteristics shown, find the shear frequency ω of the sp...

specific Embodiment approach 3

[0043] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the low-frequency and high-frequency frequency deviation signal Δf determined in step 2 after Δf passes through the frequency divider 1 (s) and Δf 2 (s) The specific process is:

[0044]

[0045]

[0046]

[0047]

[0048] The Δf(s) is the frequency deviation signal Δf in the feedback channel of the speed control system.

[0049] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a dynamic primary thermal power generating unit frequency modulation control method for a power grid with the high wind power penetration rate, and relates to a dynamic primary thermal power generating unit frequency modulation control method. In order to reduce influences caused by wind power output power fluctuation on system frequency stabilization, the primary frequency modulation control method for dynamically adjusting a difference adjustment coefficient of a thermal power generating unit is proposed by analyzing the frequency response characteristics of the thermal power generating unit when primary frequency modulation is conducted on the thermal power generating unit on the premise that the stability of the thermal power generating unit is guaranteed. According to the control method, the primary frequency modulation capability of the thermal power generating unit can be effectively improved, the thermal power generating unit can achieve the higher flexibility and capability when primary frequency modulation is conducted on the thermal power generating unit, and therefore frequency stabilization of a wind power-containing system is promoted. In a wind power-containing single-area simulation system, when 15% of wind power prediction errors are taken into account, the maximum fluctuation deviation of the system frequency is decreased to 0.0663 Hz from 0.126 Hz, and therefore the requirement of the power grid on the frequency is met. The control method is applied in the field of thermal power generating unit control.

Description

technical field [0001] The invention relates to a dynamic primary frequency modulation control method for a thermal power unit. Background technique [0002] The access of high-penetration wind power is equivalent to introducing more random power fluctuations in addition to load fluctuations, which puts forward higher requirements on the frequency modulation capacity and frequency modulation control flexibility of the power system. Improving the frequency regulation capability of thermal power units can alleviate the impact of wind power fluctuations on system frequency. Existing technical methods mainly focus on improving the frequency regulation capability of the system through rational allocation of frequency regulation capacity. However, methods for tapping the frequency regulation potential of conventional generating units are still very limited. lacking. According to the definition of the regulation coefficient of the generator set, it can be seen that the smaller the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 郭钰锋王琦万杰刘金福于达仁于继来
Owner HARBIN INST OF TECH
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