Main and auxiliary link cooperative control method for generator excitation system

An excitation system and coordinated control technology, which is applied in the direction of controlling the generator, controlling the generator through the change of the magnetic field, and controlling the system, can solve problems affecting the stability of the power grid, achieve good dynamic adjustment characteristics, and solve the effects of excitation control stability

Inactive Publication Date: 2011-11-23
NARI TECH CO LTD
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Problems solved by technology

These restrictions more or less play a certain role in the control p

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  • Main and auxiliary link cooperative control method for generator excitation system
  • Main and auxiliary link cooperative control method for generator excitation system
  • Main and auxiliary link cooperative control method for generator excitation system

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Embodiment Construction

[0018] Auxiliary ring coordinated control includes PSS control, SEDC control, under-excitation limit, over-excitation limit, rotor current limit, stator current limit, V / F limit, maximum excitation current limit, minimum excitation short-circuit limit, differential control, etc.

[0019] In the traditional control method, if the PSS parameters are not set properly, the superposition of V / F output and PSS output may cause or aggravate low-frequency oscillation. The present invention proposes in terms of model standardization, engineering application and parameter setting:

[0020] In order to ensure that V / F output does not affect excitation regulation and PSS output within the normal system voltage range, the overexcitation curves of generators and transformers must match correctly, and the adjustment coefficient should not be less than -2% when negative adjustment compensation is used;

[0021] For small hydropower units without PSS, they operate at the end of the line, and t...

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Abstract

The invention discloses a main and auxiliary link cooperative control method for a generator excitation system. Auxiliary link cooperative control is realized by the steps of PSS (power system stabilizer) control, underexcitation limit, overexcitation limit, rotor current limit, stator current limit, V/F (voltage) limit, maximum exciting current limit and regulation difference control. The main and auxiliary link cooperative control method is characterized by comprising the following steps that: 1, when a negative regulation difference compensation is adopted on a generator and transformer overexcitation magnetic curve, a regulation difference coefficient is not less than minus 2 percent; 2, a small-scale hydroelectric unit without a PSS controller is additionally provided with the PSS controller and a positive regulation difference is adopted to carry out setting on a V/F limiter; and 3, the V/F limiter adopts inverse timedelay operation under the condition of large perturbation, a phase shift of the V/F limiter in the range of 0.1-0.2Hz needs to be unobvious and cannot influence a PSS near the local oscillating frequency under the condition of small perturbation. Due to the adoption of the main and auxiliary link cooperative control method for the generator excitation system, not only is the problem of rapidness of excitation control under the condition of large perturbation solved, but also the stability in a stable state is ensured.

Description

technical field [0001] The invention relates to a coordinated control method between a main control function main loop and an auxiliary loop, and between an auxiliary loop and an auxiliary loop of a generator excitation system, and belongs to the technical field of electric system excitation control. Background technique [0002] With the continuous expansion of the scale of the power system, the stability of the power grid has become more and more prominent, and the safety of the power grid has attracted more and more attention. The requirements of the system are included in the scope of power grid management. The generator excitation system is no longer just the excitation of the power plant, but also the excitation of the power system. The excitation system not only needs to ensure the safe and stable operation of the power plant, but also provides support for the stability of the power grid. It not only needs to consider the control performance requirements in the case o...

Claims

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Application Information

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IPC IPC(8): H02P9/14H02P9/10
CPCH02P9/10
Inventor 许其品邵宜祥徐蓉
Owner NARI TECH CO LTD
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