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A synchronous generator sub-synchronization suppression method and system

A synchronous generator and sub-synchronous technology, applied in the direction of reducing/preventing power oscillation, single-network parallel feeding arrangement, etc., can solve problems such as synchronous generator speed feedback error, lagging system capacity, etc., to increase suppression ability and accurate sampling , fast effect

Inactive Publication Date: 2020-09-08
CHINA SOUTHERN POWER GRID COMPANY +1
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Problems solved by technology

[0007] In view of the above defects or improvement needs of the prior art, the present invention provides a synchronous generator subsynchronous suppression method and system, thereby solving the synchronous generator speed feedback error and lag existing in the existing synchronous generator subsynchronous oscillation method Serious and technical problems with large system capacity

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  • A synchronous generator sub-synchronization suppression method and system
  • A synchronous generator sub-synchronization suppression method and system
  • A synchronous generator sub-synchronization suppression method and system

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Embodiment Construction

[0048] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0049] When the electrical distance between the grid-connected converter and the synchronous machine is close, the present invention provides a synchronous generator sub-synchronous suppression method based on the optimization of the voltage feed-forward compensation item of the grid-connected converter, without increasing the system capacity and without changing the PI control At the same time,...

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Abstract

The invention discloses a subsynchronous inhibition method and a subsynchronous inhibition system of a synchronous generator. The method comprises the steps of performing phase locking processing on three-phase alternating current voltage VPCC of a PCC (parallel connection converter) point to obtain a voltage phase locking angle theta, performing coordinate conversion on VPCC and IPCC to obtain active and reactive components id and iq of current under a rotating coordinate system, obtaining an active current control signal Ed according to an active current reference value idref, id and a voltage feedforward control signal of a first additional voltage feedforward optimization control branch, obtaining a reactive current control signal Eq according to a reactive current reference value iqref, iq and a voltage feedforward control signal of a second additional voltage feedforward optimization control branch, obtaining a three-phase alternating current inner electric potential eabc by Eq,Ed and theta, and performing pulse width modulation on eabc to obtain a switch control signal to inhibit shafting subsynchronous vibration of a neighborhood synchronizer. According to the method and the system, the capacity of the system is not improved; a PI (proportional integral) controller parameter is not changed; only a control branch is additionally added to a voltage feedforward control item of a PCC; the electric damping of the synchronizer is improved; and an inhibition effect of subsynchronous vibration of the synchronous generator is improved.

Description

technical field [0001] The invention belongs to the technical field of electric power system stability control, and more specifically relates to a subsynchronous suppression method and system for a synchronous generator based on the optimization of the voltage feedforward compensation item of a grid-connected converter. Background technique [0002] The subsynchronous oscillation of the synchronous generator belongs to the system oscillation instability. According to its mechanism, it can be divided into two problems. One is the subsynchronous resonance problem of the power system caused by the series capacitance compensation in the AC transmission system. caused by subsynchronous oscillation problems. Since the grid-connected converter responds very sensitively to power and speed changes within the sub-synchronous range, the present invention mainly aims at the sub-synchronous oscillation problem caused by the device. [0003] The suppression of the subsynchronous oscillat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02J3/38H02J3/46
Inventor 胡荣李文朝万民惠朱建行刘起兴熊卫斌韦鑫侯佳佐陈家乐
Owner CHINA SOUTHERN POWER GRID COMPANY
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