A load frequency control method for multi-domain power system

A load frequency control and power system technology, applied in circuit devices, AC network circuits, reducing/preventing power oscillation, etc., can solve the problems that have not been widely used, increase the cost of power grid construction, etc. cost, the effect of avoiding frequent actions

Active Publication Date: 2020-05-08
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Claims
  • Application Information

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Problems solved by technology

The third frequency modulation method is currently in the research stage and has not been widely used, so the present invention only studies the first two frequency modulation methods
[0005] Although the hybrid energy storage system can make the power system operate stably under reasonable control, with the increase of wind energy penetration rate, if only energy storage technology is used to adjust the frequency, it will increase the cost of grid construction

Method used

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  • A load frequency control method for multi-domain power system
  • A load frequency control method for multi-domain power system
  • A load frequency control method for multi-domain power system

Examples

Experimental program
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Embodiment

[0047] The topological structure diagram of the multiple complementary power system in this embodiment is as follows figure 1 Shown. The active power balance equation in the frequency domain is

[0048] P mi +P GWi +P BESSi +P UCi -P tie-ij =P Li (1)

[0049] Among them, i=1, 2, j=1, 2 (i≠j), P mi Is the traditional generator output power; P GWi Is the output power of the fan, P BESSi Is the output power of the battery energy storage system; P UCi Is the output power of the super capacitor; P tie-ij Is the transmission power of the tie line; P Li Is the area active load.

[0050] Although the power system is a non-linear dynamic system, because the range of load changes near the stable operating point is very small, the power system model can be linearized when studying the load frequency control problem.

[0051] 1) Traditional generator model

[0052] Most of the traditional generator sets are thermal generator sets. They are the main method of system frequency adjustme...

) example 2

[0150] In this case, when t=5s Picture 10 The random load disturbance shown is added to the two areas of the interconnected system. The value of ACE is in the auxiliary adjustment area, and the simulation result is shown in Figure 11.

[0151] In Figure 11, the maximum frequency deviations of the proposed method, SM LFC and PI LFC with hybrid energy storage are 0.188 Hz, 0.28 Hz and 0.34 Hz, respectively. Obviously, compared with the other two control methods, the proposed method has a faster response speed and a smaller overshoot. In SM LFC, the maximum frequency deviation of the system is greater than ±0.2 Hz. Therefore, it is necessary for the super capacitor to act immediately and absorb power. After that, the traditional generator adjusts its output power under the action of the sliding mode load frequency controller. The combination of super capacitors and traditional generators can effectively improve the power quality of the system. In addition, compared with PI LFC ...

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Abstract

The invention relates to a multi-area power system load frequency control method. A power system comprises a plurality of areas interconnected by connecting lines; and each area comprises a conventional generator, a super capacitor, a battery energy storage system and a wind generator. The multi-area power system load frequency control method is characterized by comprising the step of: according to a control interval in which a value of an ACE (Area Control Error) is positioned, enabling output power of a frequency regulating device to be correspondingly regulated, and enabling a system frequency error to be kept in a normal range. Compared with the prior art, according to the multi-area power system load frequency control method disclosed by the invention, different control strategies are adopted according to the control interval of the ACE. The control strategies effectively reduce a system frequency error, improve stability of the power system and reduce cost of power grid construction.

Description

Technical field [0001] The invention relates to a load frequency control method of a power system, in particular to a load frequency control method of a multi-domain power system. Background technique [0002] Frequency is one of the important indicators to measure the safe and stable operation of the power system. In order to ensure the quality of the electric energy of the power system, it is very necessary to maintain the active power balance of the system. The increasing depletion of fossil energy and the rapid deterioration of the global environment have resulted in the vigorous development of renewable energy, such as wind energy, solar energy, and tidal energy. As a clean and renewable energy, wind energy occupies an important position in the energy structure. In recent years, the wind energy penetration rate has increased rapidly worldwide. However, the volatility and uncertainty of wind energy make the system frequency fluctuate greatly. Therefore, system frequency i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/20
Inventor 米阳郝学智马超何星瑭韩云昊苏向敬李振坤
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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