A voltage and current control method and system for an ultra-high voltage direct current transmission system
A UHV DC and current control technology, applied in the field of current control and voltage, can solve the problems of unbalanced voltage of the two valve groups and failure to meet the control requirements, and achieve the effects of avoiding fluctuations, precise control and stability
Active Publication Date: 2018-05-22
NR ELECTRIC CO LTD +1
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[0007] The above two methods are only suitable for two-valve group voltage balanced operation mode, and cannot meet the control requirements of two-valve group voltage unbalanced operation mode. With the development of UHV technology, there will be two-valve group voltage unbalanced operation mode need
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[0028] The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings.
[0029] attached figure 1 It is a schematic diagram of primary wiring and measurement signal of UHVDC transmission system, including measurement signal.
[0030] attached figure 2 It is a schematic diagram of the valve group control strategy. When the two valve groups of one pole high pressure and low pressure valve group are running normally, the control method on the rectifier side can be adopted in mode 1. The high pressure valve group adopts the control method of fixed pole current, and the control object is the DC current of this pole. ; The low-voltage valve group adopts the voltage control method of the fixed valve group, and only controls the voltage at both ends of the valve group; or the control method can adopt the method 2, the low-voltage valve group adopts the control method of the fixed-pole current, and the control object is ...
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The invention discloses a method for controlling voltage and current of an ultra-high voltage direct current transmission system, comprising: when the direct current double valve group is in operation, a valve group on the inverter side adopts a fixed pole voltage control mode, and the control object is the direct current voltage of the local pole; One valve group adopts constant valve group voltage control, which only controls the voltage at both ends of the valve group; one valve group on the rectification side adopts fixed pole current control, and the control object is the DC current of the pole; the other valve group adopts constant valve group voltage control , only control the voltage across the valve group. When the DC pole current control is transferred from the rectifier side to the inverter side under certain operating conditions, the rectifier side originally adopts the fixed pole current control valve group to switch to the fixed pole voltage control, and the inverter side originally uses the fixed pole voltage control valve group. The group is switched to fixed pole current control. The invention also discloses a voltage and current control system of an ultra-high voltage direct current transmission system, which can solve the problem of stable control of voltage and current when the double valve group is running.
Description
technical field [0001] The invention belongs to the field of ultra-high voltage direct current transmission control, in particular to a method and system for realizing voltage and current control in a series valve group direct current transmission project. Background technique [0002] At present, in conventional DC transmission projects, the rectifier side is generally operated with constant current, and the inverter side is controlled with constant DC voltage or constant arc extinguishing angle. [0003] In the UHV DC transmission project, each pole has two valve groups connected in series, each valve group has an independent control unit, and the two valve groups are required to be in voltage balance operation mode; if the traditional inverter side constant DC voltage control strategy is used , each valve group takes the DC voltage at the line end of the rectifier side as the control quantity, and the two valve groups will oscillate between the controllers in some cases. ...
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IPC IPC(8): H02J1/00
Inventor 王振曦王永平卢东斌
Owner NR ELECTRIC CO LTD