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Control method for high-voltage direct-current flexible system for supplying power to passive network

A flexible DC transmission and passive network technology, applied in the direction of power transmission AC network, etc., can solve the problems that PI regulator is difficult to meet the requirements, PI control has poor anti-interference ability, and adjustment is inconvenient, so as to improve anti-interference ability and dynamic The effects of steady-state performance, strong adaptive adjustment ability, and fast response speed

Active Publication Date: 2014-09-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most VSC-HVDC projects use the trial and error method or empirical method to select the PI regulator parameters, which requires high skills and experience in the system debugging process, and the obtained regulator may not be able to make the system performance reach the optimal state , PI control has poor anti-interference ability, large overshoot, and it is inconvenient to adjust
For a multivariable, strongly coupled, nonlinear system like VSC-HVDC, it is difficult for the PI regulator to meet the requirements of the actual system under different working conditions

Method used

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  • Control method for high-voltage direct-current flexible system for supplying power to passive network
  • Control method for high-voltage direct-current flexible system for supplying power to passive network
  • Control method for high-voltage direct-current flexible system for supplying power to passive network

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Embodiment Construction

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] see figure 1 , the flexible direct current transmission system of the present invention includes:

[0044] AC system 1, connected to the AC filter.

[0045] The AC filter 2 is connected with the AC system 1 and the commutation reactor 3, and is used for filtering out harmonics on the AC side.

[0046] The commutation reactor 3, connected with the AC filter 2 and the VSC-rectifier 4, is the link between the AC side and the converter for energy exchange, and also plays a certain filtering role.

[0047] The VSC-rectifier 4 is connected with the commutation reactor 3 and the capacitor 5 . The VSC operates in a rectification state and is used to convert the AC power of the AC system 1 into DC power and transmit it to the DC transmission line 7 .

[0048] The capacitor 5 is connected with the VSC-rectifier 4 and the DC transmissi...

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Abstract

A control method for a high-voltage direct-current flexible system for supplying power to a passive network includes: arranging a rectifier controller at the head end of a direct-current transmission line of the high-voltage direct-current flexible system, performing constant direct-current voltage control for a VSC (voltage source converter)-rectifier on the alternating-current system side, arranging a VSC-inverter controller at the tail end of the direct-current transmission line, and performing constant direct-current voltage control for the a VSC-inverter. A double closed-loop vector control policy is used for VSC-rectifier constant direct-current voltage control, fuzzy PI (proportional integral) control is used for an outer voltage loop, and current decoupling control is used for an inner voltage loop, so that active power and reactive power are controlled independently. The method avoids complicated offline parameter adjustment of a traditional PI adjustor and is capable of performing online PI parameter adjustment according to changes of the system running state and high in adaptive adjustment capability, the system is higher in response speed and control precision for various interferences and failures, and anti-interference capability and dynamic and steady-state performances of the system are improved.

Description

technical field [0001] The invention relates to the technical field of direct current transmission, in particular to a control method for a flexible direct current transmission system that supplies power to a passive network. Background technique [0002] Since the world's first high-voltage direct current transmission (HVDC) line was put into commercial operation in 1954, HVDC has been widely used in long-distance high-power transmission due to its superior performance, such as long-distance large-capacity transmission power, asynchronous networking between AC grids, etc. , Submarine cable power transmission, power supply to high-density cities with cables, asynchronous communication between AC systems, etc. However, since traditional HVDC uses semi-controlled thyristors as commutation devices, the AC grid is required to provide commutation current during commutation, which requires that the converter must be connected to an active network. At the same time, when HVDC is ru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 刘英培栗然
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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