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Voltage and current control method and system of extra-high voltage DC transmission system

An ultra-high voltage DC and current control technology, applied in the current control and voltage fields, can solve problems such as the inability to meet the control requirements and the voltage imbalance of the two valve groups, and achieve the effects of avoiding fluctuations, precise control and stability.

Active Publication Date: 2016-07-20
NR ELECTRIC CO LTD +1
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Problems solved by technology

[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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  • Voltage and current control method and system of extra-high voltage DC transmission system

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Embodiment Construction

[0028] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] attached figure 1 It is a schematic diagram of the primary wiring and measurement signals of the UHV DC transmission system, including the measurement signals.

[0030] attached figure 2 It is a schematic diagram of the control strategy of the valve group. When the normal one-pole high-pressure valve group and the low-pressure valve group are in double-valve group operation, the control method on the rectification side can adopt mode 1. The high-voltage valve group adopts the control method of fixed pole current, and the control object is the DC current of the local pole. ;The low-voltage valve group adopts the fixed valve group voltage control method, which only controls the voltage at both ends of the valve group; or the control method can adopt mode 2, the low-voltage valve group adopts the control method of fixed pole current, ...

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Abstract

The invention discloses a voltage and current control method and system of an extra-high voltage DC transmission system. According to the method, a fixed pole voltage control mode is adopted by a valve group at an inversion side during running of a DC dual-valve group, and a control object is DC voltage of a pole; fixed valve group voltage control is adopted by another valve group for only controlling the voltages of the two ends of the valve group; fixed pole current control is adopted by a valve group at a rectification side, and the control object is the DC current of the pole; fixed valve group voltage control is adopted by another valve group for only controlling the voltages of the two ends of the valve group; and when pole current control is transferred to the inversion side from the rectification side in a certain running condition of DC, the valve group originally employing fixed pole current control at the rectification side is switched to fixed pole voltage control, the valve group originally employing fixed pole voltage control at the inversion side is switched to fixed pole current control. The invention also discloses a voltage and current control system of the extra-high voltage DC transmission system. With the adoption of the method and the system, the problem of stable voltage and current control during the running of the dual-valve group can be solved.

Description

technical field [0001] The invention belongs to the field of ultra-high voltage direct current transmission control, and in particular relates to a method and system for realizing voltage and current control in a series valve group type direct current transmission project. Background technique [0002] At present, in conventional DC power transmission projects, the constant current operation mode on the rectifier side is generally adopted, and the constant DC voltage or constant arc extinguishing angle control mode is adopted on the inverter side. [0003] However, each pole of the UHVDC transmission project has two series-connected valve groups, each valve group has an independent control unit, and the two valve groups are required to operate in voltage balance mode; , each valve group takes the DC voltage at the rectification side line terminal as the control quantity, and the two valve groups will oscillate between the controllers in some cases. [0004] For the rectifie...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00
Inventor 王振曦王永平卢东斌
Owner NR ELECTRIC CO LTD
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