MMC converter station low-voltage ride-through method based on resonance controllers and control system

A resonant controller and low voltage ride-through technology, applied in output power conversion devices, conversion of AC power input to DC power output, electrical components, etc. Distortion, etc.

Active Publication Date: 2020-07-10
POWERCHINA HUADONG ENG COPORATION LTD
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Problems solved by technology

However, this method needs to separate the positive and negative sequence components of the voltage and current, and also needs to use two sets of control systems to control the positive and negative sequence components separately in two coordinate systems. In addition, the common mode current needs to be transformed into a third The control structure is very complicated, and the control parameters need to be redesigned.
In addition, sinc

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  • MMC converter station low-voltage ride-through method based on resonance controllers and control system
  • MMC converter station low-voltage ride-through method based on resonance controllers and control system
  • MMC converter station low-voltage ride-through method based on resonance controllers and control system

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Embodiment Construction

[0056] Such as figure 1 , figure 2 As shown, the MMC converter station low-voltage ride-through system based on the resonance controller under the grid voltage asymmetric drop fault in the present invention, the system includes MMC converter station 1, and the connection group is Y 0 / Y 0 The connected transformer 2, the voltage sensor 3 used to detect the three-phase voltage on the grid side, the current sensor 4 used to detect the three-phase current on the grid side, and the current sensor 5 used to detect the three-phase current on the valve side of the connected transformer; the control of the system The link includes a phase-locked loop module 6, a power calculation module 7, a coordinate transformation module 8, a DC bus voltage and reactive power controller 9, a differential mode current controller 10, a negative sequence current suppression module 11, a zero sequence current suppression module 12, Refer to the differential mode voltage calculation module 13 , the i...

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Abstract

The invention discloses an MMC converter station low-voltage ride-through method based on resonance controllers and a control system. In order to solve the problem of output current distortion of an MMC converter station when an asymmetric fault of a power grid occurs, suppression of negative-sequence and zero-sequence components and an internal loop current in the output current is realized through three resonance controllers respectively. Compared with the existing method for respectively controlling the positive and negative sequence components of the current under a forward and reverse rotation synchronous coordinate system, the method is simpler in control structure and can suppress the zero-sequence current and further improve the power sending-out capability of the MMC converter station, thereby reducing the design capacity of a DC chopper, reducing the engineering construction cost, and even realizing the fault ride-through operation of the system under the condition that the DC chopper does not need to be input when the fault is relatively light. The MMC converter station low-voltage ride-through method based on resonance controllers is simple in structure and remarkable in effect and has high engineering practical value.

Description

technical field [0001] The invention relates to a low-voltage ride-through method and control system of an MMC converter station based on a resonance controller, which is suitable for the technical field of power electronics. Background technique [0002] In recent years, with the vigorous development of offshore wind power, the construction of offshore wind farms has gradually shifted from short-distance and small-capacity to deep-sea and large-scale. Due to its mature technology and low equipment cost, the traditional AC transmission technology is more suitable for offshore wind farms with low capacity and short distance. However, when it faces the deep sea, there are problems such as high line cost, large reactive power loss, and weak support for wind farms. Therefore, generally when the routing distance exceeds 70-80km, it is the current development consensus to adopt more economical and effective HVDC transmission technology. The flexible DC transmission technology ba...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02M7/00
CPCH02J3/36H02M7/00Y02E60/60
Inventor 王霄鹤周才全杨林刚谢瑞杨建军杨文斌陈晴施朝晖郦洪柯李景一薛源徐晗
Owner POWERCHINA HUADONG ENG COPORATION LTD
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