Two-domain interconnection system load frequency control method based on frequency division control

A load frequency control and interconnection system technology, applied in the field of frequency control of two-domain interconnected systems, can solve the problems of not considering the control signal of the energy storage system, and the lack of precise control schemes for the design of thermal power units, so as to improve the ability of rapid response, fast response, The effect of improving accuracy

Active Publication Date: 2017-12-15
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0006] When the existing technology considers that the energy storage system participates in system frequency adjustment, there is no precise control scheme for traditional thermal power units, and traditional integral control or PI control is generally adopted.
In addition, in the control signal of the energy storage system, the existing technology does not consider the high-frequency component of the observed value of the active disturbance of the system as the control signal of the energy storage system

Method used

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  • Two-domain interconnection system load frequency control method based on frequency division control
  • Two-domain interconnection system load frequency control method based on frequency division control
  • Two-domain interconnection system load frequency control method based on frequency division control

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Experimental program
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Effect test

Embodiment 1

[0151] Add such as Figure 6 Load and fan output power shown. Under the above-mentioned load and random fluctuation interference of wind power, the frequency deviation and tie line power deviation of the two regions are as follows: Figure 7 shown. This case compares a system that only includes frequency regulation of traditional thermal power units and a system that uses energy storage to assist frequency regulation of traditional units, where the control signal of the energy storage system only contains the high-frequency components of the LFC control signal.

[0152] Figure 7 The simulation results show that in the system where the energy storage system assists the frequency regulation of the traditional generator, the system frequency deviation in area 1 is maintained within ±0.2Hz, the system frequency deviation in area 2 is maintained within the range of ±0.17Hz, and the tie line power deviation It is 10MW (0.005p.u). However, when only traditional thermal power uni...

Embodiment 2

[0154] On the basis of Example 1, this case verifies the validity of the scheme considering the high-frequency component of the system active disturbance observation value as the BESS control signal. Figure 8 is the system active disturbance ΔP Di and the estimated value obtained by using the disturbance observer designed by the present invention It can be seen that the waveforms of the actual value and the observed value basically coincide, and the error is small. Whether to consider BESS The simulation results of the high-frequency component as the control signal are as follows: Figure 9shown.

[0155] according to Figure 9 The simulation structure shows that, When the high-frequency component of the BESS is used as the control signal of the BESS, that is, the BESS adopts Figure 5 In the control system shown, the system frequency deviations of area 1 and area 2 are effectively controlled within the range of ±0.12Hz, which effectively reduces the system frequency...

Embodiment 3

[0157] The traditional thermal power units in Embodiment 1 and Embodiment 2 all adopt traditional integral control. In order to improve the control accuracy of traditional thermal power units, a sliding mode load frequency controller u is added in the secondary frequency regulation link. In this case, the BESSs in both regions adopt Figure 5 In the control system shown, the simulation results of traditional integral control and sliding mode load frequency control for thermal power units are as follows: Figure 10 shown. When the traditional thermal power unit adopts the integral control, the system frequency deviation of area 1 and area 2 is basically maintained within the range of ±0.12Hz, while the frequency deviation of the two areas is maintained within ±0.05Hz after the sliding mode load frequency control is adopted. It can be seen that the sliding mode load frequency controller can effectively reduce the system frequency deviation and improve the robustness of the syst...

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Abstract

The invention relates to a two-domain interconnection system load frequency control method based on frequency division control and aims to control load frequency of a two-domain interconnection electric power system comprising a wind power generation set, a traditional thermal power generation set and a cell energy storage system. The method comprises steps that 1), the two-domain interconnection electric power system is constructed according to mathematics models of the traditional thermal power generation set, the wind power generation set and the cell energy storage system; 2), an interference observer for the cell energy storage system and a sliding mode load frequency controller for the traditional thermal power generation set are respectively designed; and 3), an ACE frequency division control method based on filtering is employed, and control on the load frequency of the two-domain interconnection electric power system is carried out. Compared with the prior art, the method is advantaged in that frequency division control is realized, fast response is realized, and precision is improved.

Description

technical field [0001] The invention relates to the field of frequency control of a two-domain interconnection system, in particular to a load frequency control method for a two-domain interconnection system based on frequency division control. Background technique [0002] The contradiction between economic development and resources and environment is a major challenge that China needs to face for a long time in its modernization drive. As a new energy source with the greatest potential for large-scale development, wind power has brought a new dawn to China and the world. However, affected by weather and climate, wind power output has volatility and uncertainty. Therefore, the connection of large-scale wind power generation to the grid puts forward higher requirements for the stable operation of the power system. [0003] Automatic Generation Control (AGC) is an important way to maintain power system active power balance and frequency stability. The traditional thermal p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38H02J3/32
CPCH02J3/24H02J3/32H02J3/386H02J2203/20Y02E10/76Y02E40/10
Inventor 米阳郝学智宋根新何星瑭韩云昊苏向敬李振坤符杨
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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