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An isolated island converter station and its AC fault ride-through method

A fault ride-through and converter station technology, applied in AC network circuits, emergency protection circuit devices, emergency protection devices for automatic disconnection, etc., can solve problems such as system instability, ensure stability and safety, and prevent over The effect of excessive adjustment and good operating environment

Active Publication Date: 2020-08-25
XUJI GRP +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an island converter station and its AC fault ride-through method to solve the problem of system instability when an AC fault occurs in an island converter station in the prior art

Method used

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  • An isolated island converter station and its AC fault ride-through method
  • An isolated island converter station and its AC fault ride-through method
  • An isolated island converter station and its AC fault ride-through method

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Embodiment Construction

[0036] 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.

[0037] Since the island converter station of the flexible direct current transmission system is not connected to the AC grid, the island converter station of the flexible direct current transmission system is required as an AC voltage source to provide a stable AC voltage.

[0038] In order to realize the stable control of the AC voltage, the flexible DC converter station adopts a double closed-loop control method, such as figure 1 As shown, the outer loop is a constant AC voltage control loop, and the inner loop is a current loop. At the same time, in order to improve the stability of the system, the voltage outer loop adopts VF droop control, and the droop characteristics of reactive power and amplitude are added to the acquisition of voltage amp...

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Abstract

The invention relates to an island converter station and an alternating-current fault ride-through method thereof. When a fault occurs on an alternating-current side of a system, the voltage outer ring is cut off. According to the alternating current voltage amplitude value and the alternating current low limit value, the positive sequence reactive power instruction value and the positive sequenceactive current instruction value of the positive sequence component control loop of the current inner loop can be calculated, and the current inner loop control can be conducted. According to the invention, the fault ride-through capability can be improved, and a good operation environment is provided for system safety and stability. In addition, when fault recovery is carried out, the command value of the voltage outer ring is gradually increased to the rated voltage and is kept to be the rated voltage, and the alternating-current voltage is guaranteed to rise stably, and the situation thatover-adjustment is too large can be avoided. The stability and the safety of the system are ensured, and the fan off-net is effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of power system fault protection, and in particular relates to an island converter station and an AC fault ride-through method thereof. Background technique [0002] With the development of fully-controlled power electronic devices and the application of power electronic technology in power systems, the flexible DC transmission technology based on modular multilevel converters can independently control active and The advantages of load power supply and low harmonic content are increasingly valued. When a temporary fault occurs on the AC side of the flexible HVDC transmission system, it is hoped that the fault ride-through can be achieved through control strategy switching to ensure that the system can quickly resume operation after the fault is cleared. [0003] In June 2015, Volume 35, Issue 6, "Electric Power Automation Equipment" published "Islanding Detection Method Based on Droop Control and Its Improv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02H7/26H02H3/06
CPCH02H3/066H02H7/262H02J3/38H02J3/388
Inventor 行登江吴金龙王先为李道洋刘永慧
Owner XUJI GRP
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