Controller and control method for suppressing commutation failure of direct-current transmission system after alternating-current fault clearing
A technology for DC transmission system and fault removal, applied in the direction of power transmission and AC network, etc., can solve the problems of lack of controller characteristics, complex control system, influence, etc.
Inactive Publication Date: 2014-08-13
ZHEJIANG UNIV
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Therefore, the digital simulation that originally had guiding and testing significance for actual engineering planning and construction loses its credibility and has a huge impact on actual work
It can be seen from the analysis that the control system of the actual DC project is very complex, and only the simplified control system is generally used in the simulation software. After the above-mentioned fault is removed, the commutation failure occurs again, which is largely due to the simplification of the controller resulting in the loss of some characteristics. due to
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[0052] In order to describe the present invention more specifically, the technical solutions and related principles of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0053] Such as figure 2 As shown, a controller for suppressing the commutation failure of the DC transmission system after the AC fault is removed, including: harmonic detection unit, feedforward compensation control unit, selector, cut-off angle control unit, voltage control unit, low-voltage current limiting control unit, current control unit, maximum selector, subtractor and trigger unit; where:
[0054] The harmonic detection unit is used to detect the harmonics of the three-phase AC voltage ua~uc of the receiving end grid of the DC transmission system to obtain the three-phase harmonic signal u ha ~ u hc ; In this embodiment, the harmonic detection unit adopts such as image 3 The procedure shown implements:
[0055] (1) T...
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The invention discloses a controller for suppressing the commutation failure of a direct-current transmission system after alternating-current fault clearing. The controller comprises a harmonic detection unit, a feed-forward compensation control unit, a selector, a turn-off angle control unit, a voltage control unit, a low-voltage current-limiting control unit, a current control unit, a maximum selector, a subtracter and a trigger unit; and the controller disclosed by the invention controls an inverter in the direct-current transmission system so as to effectively suppress the commutation failure situation of the system after alternating-current fault clearing. The invention also discloses a control method for suppressing the commutation failure of a direct-current transmission system after alternating-current fault clearing; and according to the method, based on the existing control methods and through adding an improved low-voltage current-limiting control technology and an alternating-current voltage harmonic detection based trigger leading-angle feed-forward compensation technology, a situation that the direct-current transmission system after alternating-current fault clearing has a commutation failure is effectively suppressed, thereby facilitating the stable running of the whole system.
Description
technical field [0001] The invention belongs to the technical field of electric power system simulation, and in particular relates to a controller and a control method for suppressing commutation failure of a direct current transmission system after an alternating current fault is removed. Background technique [0002] Commutation failure is a common failure of inverters, and it is also one of the key issues that need to be considered in the design of the entire DC transmission system. Previous studies have pointed out a variety of system disturbance factors that cause commutation failure. Since the HVDC system is a nonlinear system with complex coupling relationships among multiple factors, it is necessary to comprehensively consider multiple factors of the system in order to analyze the commutation failure. According to the actual project operation, it is generally believed that the failure of the AC system is the main reason for the commutation failure of the inverter st...
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IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 徐政许烽董桓峰翁华黄弘扬
Owner ZHEJIANG UNIV