Inertia comprehensive control method for power generation system comprising controllable inertia wind power generator

A technology for wind turbines and power generation systems, which is applied in wind power generation, reducing/preventing power oscillations, and single-grid parallel feeding arrangements. impact and other issues to achieve the effect of improving dynamic stability and enhancing capabilities

Inactive Publication Date: 2015-11-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

However, unlike the inherent inertia of conventional generator sets, variable-speed wind turbines can release or absorb rotor kinetic energy within a wide range of speed adjustment, and the size of their virtual inertia can be flexibly adjusted, which in turn will change the size and distribution of system inertia. System frequency adjustment faces many new problems
The inertial controllability of multiple machines will also have a significant impact on the frequency and attenuation characteristics of power oscillations between regional power grids

Method used

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  • Inertia comprehensive control method for power generation system comprising controllable inertia wind power generator
  • Inertia comprehensive control method for power generation system comprising controllable inertia wind power generator
  • Inertia comprehensive control method for power generation system comprising controllable inertia wind power generator

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Embodiment 1

[0028] Such as figure 2 As shown, the present embodiment adopts the IEEE four-machine two-region system, which includes four thermal power plants with a rated capacity of 900 MWA, and one doubly-fed wind farm with a capacity of 250 x 2WM. Among them, the thermal power plant G 1 , G 2 Constitute area 1, which is the power transmission end; G 3 , G 4 Then constitute area 2, which is the power receiving end. L 1 and L 2 are the loads in zone 1 and zone 2, respectively. In Example 1 of this paper, the wind farm DFIG via bus B 5 Merged into area 1; and in embodiment 2, the wind farm DFIG in area 1 is changed to bus B 11 Merge into area 2, as shown by the dotted line in the figure. Among them, the wind farm is composed of doubly fed induction generator (DFIG), and its virtual inertial control structure is as follows: image 3 shown. In the simulation, the wind speed is set to 11m / s. By setting the following two control schemes, it is shown that the present invention can ...

Embodiment 2

[0089] The difference from Embodiment 1 is that in Embodiment 2, the controllable inertial wind turbine is changed to the receiving end, and the bus B 11 Incorporated into area 2, such as figure 2 Shown by the dotted line. In the simulation, set the wind speed to 11m / s, set the control scheme ③, and the third differential control coefficient T vir =20.

[0090] Such as Figure 9 shown, the load L 1 The sudden increase of 200MW at the moment of 2.0s caused the system frequency to drop sharply. When there is no additional inertia control, after a sudden load increase, the system frequency fluctuates greatly; after adopting this embodiment, the controllable inertia wind turbine uses its virtual large and constant inertia to make the amplitude and change of the system frequency drop The frequencies are significantly reduced, and compared with Example 1, the same frequency modulation effect is arranged.

[0091] Such as Figure 10 Shown, bus B 8 At 2.0s, a three-phase shor...

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Abstract

The invention discloses an inertia comprehensive control method for a power generation system comprising a controllable inertia wind power generator set. The method comprises the steps that whether power gird frequency of a grid-connected point changes is judged, monitoring continues if the judgment result is no, the position of the grid-connected point of the controllable inertia wind power generator set is judged if the judgment result is yes, and active increment deltaP<f> is judged as (the expressions are described in the specification) if the position is at a feed end, or active increment deltaP<f> is judged as (the expressions are described in the specification). Compared with conventional inertia control, the corresponding inertia adjustment method can be adopted according to the geographic position of an area in which a wind power plant is positioned so that two control functions of participating in power grid frequency adjustment and increasing system damping are possessed, and adverse influence caused by introduction of negative damping in frequency modulation of conventional virtual inertia control is eliminated. The size of inertia of the system of the subarea in which the wind power plant is positioned can be flexibly changed by the interconnected power grid with the help of the wind power plant so that inertial support and damping power oscillation capability can be enhanced and dynamic stability of the system can be enhanced.

Description

technical field [0001] The invention relates to a control method of a power generation system, in particular to an inertia comprehensive control method of a power generation system including a controllable inertial wind power generating set, and belongs to the technical field of power generation system control. Background technique [0002] In the power generation system with a high proportion of new energy installed capacity in the future, the virtual inertia of multiple power sources will become an adjustable parameter to maintain the dynamic stability of the system. Although it will increase the difficulty of analyzing the stability of the power grid, the control method will also be more flexible. Taking the variable-speed wind turbine as an example, through independent active power adjustment, the unit can simulate a controllable inertial response, effectively avoiding the adverse effects of weakening the system inertia and threatening frequency stability. However, unlik...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/40H02J3/24
CPCY02E10/76
Inventor 付媛陈玉伟张祥宇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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