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STATCOM+SEDC combined restraining method for generator set subsynchronous oscillation

A technology of subsynchronous oscillation and combined suppression, which is applied in the direction of controlling generators, reducing/preventing power oscillations, electrical components, etc., and can solve problems such as high cost

Inactive Publication Date: 2015-01-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

On the one hand, STATCOM will not be limited by capacity and has a strong ability to suppress SSO; on the other hand, the output current of STATCOM will be shunted by the system, which is related to the equivalent impedance of the access system. At the same time, as a primary device, STATCOM Expensive

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  • STATCOM+SEDC combined restraining method for generator set subsynchronous oscillation
  • STATCOM+SEDC combined restraining method for generator set subsynchronous oscillation
  • STATCOM+SEDC combined restraining method for generator set subsynchronous oscillation

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Embodiment Construction

[0033] The invention proposes a STATCOM+SEDC joint suppression method for subsynchronous oscillation of a generating set. The method adopts two measures of STATCOM and SEDC for combined suppression, and exerts the respective characteristics of the two measures.

[0034] In the STATCOM+SEDC joint suppression scheme, the SEDC suppression effect is fully utilized first, and the STATCOM plays an additional additional damping effect to suppress each modal component of the Evenki unit below the threshold value. The suppression effect of the STATCOM+SEDC scheme under various operating modes of the generator set is simulated and calculated, and the capacity of STATCOM in the STATCOM+SEDC joint suppression scheme is determined under the worst working conditions.

[0035] 1. Theoretical proof of the feasibility of the joint suppression scheme of STATCOM and SEDC

[0036] The plant-side SEDC can effectively suppress the subsynchronous oscillation SSO of the generator set under most worki...

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Abstract

The invention provides an STATCOM+SEDC combined restraining method for generator set subsynchronous oscillation. The function that an SEDC and an STATCOM coordinate with each other to restrain subsynchronous oscillation is analyzed according to the SEDC and STATCOM restraining principle, the deduction on electric damping of two restraining measures proves that the SEDC and the STATCOM are independent in restraining effect, and the effectiveness of the STATCOM+SEDC combined restraining method is verified through the simulation calculation in a typical system. The SEDC can work in cooperation with the STATCOM and carry out coordinate restraining with the STATCOM, the SEDC is small in investment and occupied space and convenient to maintain, the SEDC has the obvious economical advantages compared with the STATCOM, and therefore the STATCOM+SEDC combined restraining method has very obvious advantages.

Description

technical field [0001] The invention relates to a suppression method for subsynchronous oscillation of a power system, in particular to a STATCOM+SEDC joint suppression method for subsynchronous oscillation of a generating set. Background technique [0002] The research on the subsynchronous oscillation problem at home and abroad shows that the occurrence of subsynchronous oscillation is due to the close coupling between the electrical subsystem and the mechanical subsystem in the power system, and some methods can be taken to destroy the coupling between the two or increase the system The damping itself prevents or suppresses subsynchronous oscillations. At present, there are many measures to suppress the subsynchronous oscillation of the turbo-generator set. These suppression measures can be divided into plant-side measures and grid-side measures. Power plant side suppression measures mainly refer to the suppression measures taken on the power plant side. At present, it ...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02P9/00
CPCH02J3/002H02J3/24H02P9/00Y02E40/10
Inventor 肖仕武毕天姝张鹏毛雨亭李景一
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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