Circulation control strategy for reducing current peak of flexible HVDC (High Voltage Direct Current Transmission) converter valve

A flexible DC power transmission and circulating current control technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve problems such as protection circuit action, and achieve the effect of reducing the current peak value of the converter valve, easy to implement, and simple in principle

Active Publication Date: 2015-02-04
BEIJING RONGXIN HUIKE TECH
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Problems solved by technology

At present, the current control of the converter valve is mainly used to suppress the rise of the fault current. However, due to the sampling delay, controller calculation and communication delay, the moment of fault occurrence, the overcurrent of the bridge arm current peak value will still cause the protection circuit to operate.

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  • Circulation control strategy for reducing current peak of flexible HVDC (High Voltage Direct Current Transmission) converter valve
  • Circulation control strategy for reducing current peak of flexible HVDC (High Voltage Direct Current Transmission) converter valve
  • Circulation control strategy for reducing current peak of flexible HVDC (High Voltage Direct Current Transmission) converter valve

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Embodiment Construction

[0020] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] The principle of the circulation control strategy of the present invention is as follows: figure 1 shown. Curve 1 in the figure is the converter valve current when there is no circulating current; Curve 2 and Curve 3 are the natural circulating current and converter valve current when the circulating current control is not enabled; Curve 4 and Curve 5 are the amplitude and value injected by the control strategy and The circulating current with phase angle controllable and the converter valve current after injecting the controllable circulating current. From the curve 5 in the figure, it can be seen that through the circulation control, the current peak value of the converter valve is reduced, and thus the ride-through capability of the AC low voltage fault of the flexible DC transmission system can be improv...

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Abstract

The invention discloses a circulation control strategy for reducing the current peak of a flexible HVDC (High Voltage Direct Current Transmission) converter valve. The flexible HVDC converter valve is a modular multi-level voltage source type converter valve. According to the circulation control strategy, second harmonic frequency circulation components are superimposed on the basis of fundamental currents and direct components of the converter valve, and the second harmonic frequency circulation components are circulation components generated by the circulation control strategy with controllable amplitude and phase angle, or natural circulation introduced under the control of not-enabled circulation. The circulation control strategy can reduce the current peak of the converter valve, especially reduce the current peak of a faulted rear axle arm on the alternating current side so that the current peak of the faulted rear axle arm cannot exceed the overcurrent protection threshold of the axle arm, and the alternating current fault ride-through capability of the HVDC system is improved. The circulation control strategy is simple in principle, clear in thinking and easy to achieve.

Description

technical field [0001] The invention belongs to the technical field of control of a flexible direct current transmission system, and in particular relates to a circulation control strategy capable of reducing the peak value of a valve current in a flexible direct current transmission system. Background technique [0002] The flexible direct current transmission system refers to the high voltage direct current transmission system (HVDC) based on the voltage source converter (Volatge Source Converter, VSC), which can independently adjust the active power and reactive power at the same time, does not have the problem of commutation failure, and can The advantages of passive system power supply and low harmonic level are mainly used in wind power grid connection, island power supply, asynchronous networking and other fields. It is a research hotspot and development direction in the field of HVDC transmission. [0003] With the development of flexible DC engineering to ultra-high...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCY02E60/60H02J3/36H02J2003/365
Inventor 岳伟翁海清张海涛易荣
Owner BEIJING RONGXIN HUIKE TECH
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