Frequency locking control method and system for suppressing power harmonics and amplitude disturbance
A control method and frequency-locking technology, applied to AC networks to reduce harmonics/ripples, harmonic reduction devices, etc., can solve problems such as the inability to suppress power grid harmonics and amplitude disturbance performance
Active Publication Date: 2014-04-30
SUNGROW POWER SUPPLY CO LTD
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[0005] In view of this, the purpose of this application is to provide a frequency-locked control method and system for suppressing power grid harmonics and amplitude disturbances, so as to solve the problem that the existing technology cannot take into account both the performance of suppressing power grid harmonics and amplitude disturbances
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[0062] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.
[0063] The embodiment of the present application discloses a frequency-locking control method and system for suppressing power grid harmonics and amplitude disturbances, so as to solve the problem that the prior art cannot take into account both performances of suppressing power grid harmonics and amplitude disturbances.
[0064] refer to figure 1 The frequency-locking control method for suppressing power grid harmonics and amplitude disturbances provided b...
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The invention discloses a frequency locking control method and system for suppressing power harmonics and amplitude disturbance. The frequency locking control method for suppressing the power harmonics and amplitude disturbance comprises the steps that a positive-sequence component of a network voltage is extracted according to a fundamental wave signal of a three-phase network voltage signal and a corresponding orthogonal signal of the three-phase network voltage signal; notch processing is carried out on a difference signal between the three-phase network voltage signal and the orthogonal signal of the three-phase network voltage signal, and low-order harmonics are removed through filtration; a frequency error variable of a system is obtained through calculation according to the orthogonal signal and the difference signal obtained after notch processing is carried out, then, normalization processing is carried out on the positive-sequence component and the frequency error variable, and an input frequency value is obtained; after integration is carried out on the input frequency value, the input frequency value and a rated power grid frequency are superposed, a frequency locking value is obtained, and the frequency locking value is fed back to the filtering link. According to the frequency locking control method and system for suppressing the power harmonics and amplitude disturbance, due to the fact that notch processing is carried out on the difference signal, the capacity of the grid-connected system for suppressing the harmonics is improved, and the capacity of the system for suppressing network voltage amplitude disturbance is improved through normalization processing, in other words, both the capacity of the grid-connected system for suppressing the harmonics and the capacity of the grid-connected system for suppressing amplitude disturbance are ensured.
Description
technical field [0001] The present application relates to the technical field of grid control, in particular to a frequency-locking control method and system for suppressing grid harmonics and amplitude disturbances. Background technique [0002] In the grid-connected power generation system, it is necessary to detect the grid phase or frequency information in real time, and use the phase or frequency information as the current reference input to synchronize the grid-connected current with the grid voltage; at the same time, due to the possible resonance at the grid-connected interface, the The grid voltage harmonic content increases, so it is also necessary to suppress the grid voltage harmonics. [0003] Existing methods commonly used to achieve grid synchronization include phase-locked loops and frequency-locked loops. Since the grid frequency is more stable than the grid voltage under the conditions of grid faults and voltage imbalances, frequency-locked loops are prefer...
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Login to View More IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 程林潘年安陶磊
Owner SUNGROW POWER SUPPLY CO LTD