Generator wide area damping control method based on model-free adaptive control algorithm

A model-free adaptive and self-adaptive control technology, applied in the direction of reducing/preventing power oscillation, etc., can solve the problems of large deviation and inability to guarantee the control effect, and achieve the effects of improving stability, avoiding modeling, and suppressing low-frequency oscillation

Inactive Publication Date: 2014-02-19
STATE GRID CORP OF CHINA +3
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Problems solved by technology

However, the power system itself is a high-order complex nonlinear system, and when a large disturbance or fault occurs, the power system presents a strong nonlinearity, and the linear model of the power system obtained by online identification deviates greatly from the actual power system. The control method based on the linear model of the power system obtained by online identification often cannot guarantee its control effect

Method used

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  • Generator wide area damping control method based on model-free adaptive control algorithm
  • Generator wide area damping control method based on model-free adaptive control algorithm
  • Generator wide area damping control method based on model-free adaptive control algorithm

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Embodiment

[0094] Example: four-machine two-zone system

[0095] Taking the four-machine two-zone system as an example to illustrate the effectiveness of the above generator wide-area damping adaptive control method, the system structure is as follows: image 3 shown.

[0096] The system consists of two areas, area 1 and area 2, each area has two generators, the two areas are connected by the inter-area connection line 3, 4, and the inter-area transmission power is 413MW; the four generators in the system are exactly the same, The rated capacity is 900MW and the rated voltage is 20kV. The generator wide-area adaptive damping control is applied to the excitation end of the generator 4, and the wide-area feedback signal of the generator wide-area damping control is the bus frequency difference signal between area 2 and area 1.

[0097] In this embodiment, the generator wide-area damping adaptive control method for the above-mentioned four-machine two-zone system includes the following st...

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Abstract

The invention relates to a generator wide area damping control method based on a model-free adaptive control algorithm and belongs to the electric power system stabilization analysis technology field. The method comprises steps that control parameters of a traditional generating wide area damping control method are acquired according to a traditional transfer function expression and a parameter calculating formula; control parameter initial values of the generator wide area damping adaptive control method is calculated according to the acquired control parameters of the traditional generating wide area damping control method, an acquired pseudo gradient vector initial value is taken as an initial point, and an estimated value of a pseudo gradient vector is updated online by utilizing input output data actually measured by a controlled system; a generator wide area damping adaptive control signal is calculated according to the estimated value of the pseudo gradient vector which is updated online; repeated calculation is carried out till the generator wide area damping control signals reach to a maximum level. The method can guarantee a control effect of generator wide area damping control under multiple operation states of the system.

Description

technical field [0001] The invention belongs to the technical field of power system stability analysis, in particular to a wide-area damping control method based on a model-free adaptive control algorithm. Background technique [0002] With the rapid development of the power system and the continuous interconnection of regional power grids, the problem of low-frequency oscillation between regional power grids has become increasingly prominent. The traditional method to suppress low-frequency oscillation in the interval is to apply power system stability control (Power Stability Stabilizer, PSS) on the excitation side of the power system generator. However, due to the insufficient observability of the local feedback signal adopted by PSS to the interval oscillation mode, the suppression effect of PSS on interval low-frequency oscillation is limited. [0003] The maturity of wide-area measurement technology can realize the real-time collection of wide-area signals of the whol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
Inventor 庞小艳赵艺陆超李建段刚
Owner STATE GRID CORP OF CHINA
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