Doubly-fed wind power grid-connected system stability adjustment system and method

A system stability, doubly-fed wind power technology, applied in the direction of wind power generation, single-network parallel feeding arrangement, etc., can solve the problems of dependence on state variables, system disturbance and instability, lack of research, etc., to achieve small calculation and smooth adjustment process Faster, better damping effect

Active Publication Date: 2019-11-05
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing studies still rely on the state variables of all units in the system, and can only qualitatively analyze the machine-network coupling
There is still a lack of corresponding research on the quantification of the degree of machine-network coupling and the reasons why the parameters of the phase-locked loop lead to machine-network coupling and make the system disturbed and unstable.

Method used

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  • Doubly-fed wind power grid-connected system stability adjustment system and method
  • Doubly-fed wind power grid-connected system stability adjustment system and method
  • Doubly-fed wind power grid-connected system stability adjustment system and method

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Effect test

Embodiment 1

[0074] A stability adjustment method for doubly-fed wind power grid-connected system, the flow chart is as follows figure 1 As shown, the method includes the following steps:

[0075] Step 1: Collect the port voltage and current data of the doubly-fed wind turbine in the power grid system that generates low-frequency oscillation, and calculate the real-time dynamic energy of the doubly-fed wind turbine port;

[0076] Step 2: Obtain the dissipation intensity of the doubly-fed wind turbine according to the calculated real-time dynamic energy;

[0077] Step 3: Obtain the damping level of the doubly-fed wind turbine for low-frequency oscillation according to the evaluation of the dissipation strength of the doubly-fed wind turbine;

[0078] Step 4: Based on the influence law of the phase-locked loop parameters on the damping level of the DFIG, adjust the parameters of the PLL to increase the damping level of the DFIG until the damping level meets the requirements.

[0079] Durin...

Embodiment 2

[0167] A specific embodiment of the present invention discloses a doubly-fed wind power grid-connected system stability adjustment system, including a data acquisition module, a dissipation strength calculation module, a machine-network coupling analysis module, a result output module, and a stability adjustment module; The data acquisition module is used to collect the port voltage and current data of the doubly-fed wind turbine, and transmit it to the dissipation intensity calculation module; The dynamic energy emitted by the unit, and the non-periodic component is extracted, and the change slope of the non-periodic component is calculated as the dissipation intensity; the machine-network coupling analysis module is used to evaluate the degree of machine-network coupling and the impact of double-fed wind turbines on low-frequency oscillations. damping level, and analyze the mechanism of the phase-locked loop parameters on the dissipation intensity; the result output module is...

Embodiment 3

[0175] as figure 2 The shown New England 10-machine 39-node system is taken as an example. Considering the applicability of the present invention in different scenarios, three simulation scenarios of three-phase instantaneous short circuit, load power fluctuation, and forced oscillation are respectively set up. The scenario parameter settings are shown in Table 1.

[0176] Table 1 Simulation scene parameter settings

[0177]

[0178] The New England system can be divided into 4 major areas, among which, area 1 is composed of G1, area 2 is composed of G2 and G3, area 3 is composed of G4-G7, and area 4 is composed of G8-G10. The synchronous generator G1 in area 1 is replaced by a wind farm composed of double-fed wind turbines with virtual inertia control of equal capacity, that is, BUS39 is connected to a wind farm composed of 1000 double-fed wind turbines with a rated capacity of 1.5MW.

[0179] Run the dissipation strength analysis module, and the result is:

[0180] 1) ...

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Abstract

The invention relates to a doubly-fed wind power grid-connected system stability adjustment system and method, belongs to the technical field of wind power generation system, and solves the problem inthe prior art that it is difficult to quantitatively analyze and adjust the stability of the system for machine-grid coupling in the doubly-fed wind power grid-connected system. The method comprisesthe following steps: collecting the voltage and current data of a doubly-fed wind turbine port in a power network system which generates low frequency oscillation and calculating the real-time dynamicenergy of the doubly-fed wind turbine port; obtaining the dissipation intensity of the doubly-fed wind turbine according to the calculated real-time dynamic energy; obtaining the damping level of thedoubly-fed wind turbine to low frequency oscillation according to the dissipation intensity evaluation of the doubly-fed wind turbine; and adjusting the phase-locked loop parameters based on the influence law of the phase-locked loop parameters on the damping level of doubly-fed wind turbine and improving the damping level of the doubly-fed wind turbine until the damping level meets the requirements. The timely oscillation stability early warning can be realized and stability adjustment of the system can be realized by adjusting the phase-locked loop parameters.

Description

technical field [0001] The invention relates to the technical field of wind power generation systems, in particular to a stability adjustment system and method for a doubly-fed wind power grid-connected system. Background technique [0002] With the large-scale grid-connection of wind turbines, the stability of wind power grid-connection has gradually become prominent. The weak coupling between the rotor and the stator of the double-fed wind turbine makes the wind turbine present weak damping characteristics after the system is disturbed, and the introduction of the phase-locked loop can stabilize the grid-connected voltage of the wind turbine and enhance the coupling between the wind turbine and the grid. Especially after low-frequency oscillation is detected at the wind turbine end, the phase-locked loop may amplify the system oscillation, deteriorate the system damping level, and threaten the safe and stable operation of the power grid. Therefore, it is urgent to carry o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/40
CPCH02J3/40Y02E10/76
Inventor 马静沈雅琦杨更宇周晓东张敏吴羽翀
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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