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System frequency characteristic quantitative evaluation method considering frequency secondary drop

A system frequency, quantitative evaluation technology, applied in the direction of calculation, reducing/preventing power oscillation, instruments, etc., can solve problems such as difficult to analyze frequency response, and achieve the effect of high precision

Pending Publication Date: 2022-05-13
YUNNAN POWER GRID
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Problems solved by technology

Analyzing frequency dynamics needs to combine the models of all power generation equipment in the system, but considering the detailed models of each equipment at the same time will make it difficult to analyze the frequency response due to the high order of the model

Method used

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  • System frequency characteristic quantitative evaluation method considering frequency secondary drop
  • System frequency characteristic quantitative evaluation method considering frequency secondary drop
  • System frequency characteristic quantitative evaluation method considering frequency secondary drop

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specific Embodiment

[0124] Establish a three-machine power system in Matlab / Simulink software, such as figure 2 shown. The capacities of synchronous machines G1 and G2 at nodes 1 and 2 in the figure are 200MVA and 100MVA respectively, and the prime movers are steam turbines. The capacity of doubly-fed wind turbine WTG3 at node 3 is 100MVA. Nodes 4-6 are network nodes. Nodes 7 to 9 are load nodes, and the load is a constant power load. Network nodes and load nodes are collectively referred to as constant power nodes. The line is purely inductive, and the line parameters are shown in Table 1 when the capacity of G2 is used as the reference value for the standard unit. In steady state, the voltage of each node is converted to 1, and the phase angle difference of each line is converted to 0.

[0125] Table 1 The line reactance value in the simulation verification of the embodiment

[0126] X 14

0.05 X 25

0.15 X 36

0.05 X 47

0.1 X 48

0.1 X 57

0.2 X 5...

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Abstract

The invention relates to a system frequency characteristic quantitative evaluation method considering frequency secondary drop, and belongs to the technical field of power system frequency modulation. The method comprises the following steps: firstly, in a multi-machine power system comprising power generation equipment, considering the overall frequency response characteristic of the system and the relationship between the power response delta Pe (s) of each power generation equipment and the frequency-active transfer function G (s) of each power generation equipment under power disturbance delta PL (s); the overall frequency response characteristic of the system is represented by a frequency common-mode component delta omega (s); through an iterative algorithm, aiming at the frequency common-mode component, a differential-proportion-first-order lagging structure is adopted to approximate power response under disturbance of each power generation device, and a frequency modulation capability quantization parameter is obtained; and calculating a frequency characteristic quantitative index by using the obtained frequency modulation capability quantitative parameter, comparing the frequency characteristic quantitative index with a frequency characteristic critical value allowed by the system, and performing frequency characteristic evaluation. By evaluating the frequency characteristics, whether the lowest point of the system frequency and the average change rate of the system frequency meet the system frequency modulation requirement or not is determined, so that frequency modulation is realized.

Description

technical field [0001] The invention belongs to the technical field of power system frequency modulation, and relates to a method for evaluating frequency characteristics of a power system, in particular to a method for quantifying and evaluating system frequency characteristics in consideration of secondary frequency drops. Background technique [0002] In recent years, the penetration rate of new energy such as wind and solar in the power system has been continuously increasing. Since new energy generally operates in the maximum power tracking mode and does not participate in frequency regulation, this reduces system inertia and reduces system frequency regulation capability, which has a negative impact on system frequency stability. For this reason, scholars at home and abroad have proposed a control strategy for new energy grid-connected active participation in frequency regulation. [0003] The wind turbine is generally connected to the grid through a converter, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/24G06Q10/06G06Q50/06
CPCH02J3/38H02J3/241G06Q10/06393G06Q50/06H02J2300/28Y02E10/76
Inventor 吴琛辛焕海张雯欣黄伟高晖胜程旻谢一工张丹曾丕江黄润刘旭斐
Owner YUNNAN POWER GRID
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