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Voltage control for electric power systems

A technology of voltage control and control parameters, which is applied in the direction of control/regulation system, regulation of electric variables, instruments, etc., and can solve problems such as inability to provide coordination

Inactive Publication Date: 2009-10-07
ABB RES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For changes due to load changes, which occur with very long time constants compared to these delays, these methods cannot provide coordination unless additional communication is provided between tap changers

Method used

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  • Voltage control for electric power systems
  • Voltage control for electric power systems
  • Voltage control for electric power systems

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Embodiment Construction

[0023] figure 1A selection of an exemplary structure of a distribution network is shown. Along the radial feeder from the transmission substation to the load, a series of decreasing voltage levels is indicated. The bypass capacitor bank 10 is depicted as the first voltage control device at the highest voltage level shown (130kV), which also represents the lowest voltage level in the transmission system and is called the secondary transmission (sub -transmission) level. Three tap-changing transformers 20, 30, 40 are provided as additional voltage control means connecting successive voltage levels. Between the lower and higher voltage levels, only a single current path is possible and no loops are formed. Any of the shown voltage control devices 10, 20, 30, 40 can be used to control at least the downstream voltage, i.e. the voltage at the far side from the substation, in response to control commands issued by the appropriate voltage control unit 31, 41 level.

[0024] fig...

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Abstract

The present invention is concerned with a limitation of the interaction between cascaded tap changers and / or between a tap changer and a shunt compensator independently of any real-time communication between the respective controllers. According to the invention, coordinated voltage control in distribution networks is enabled by an adaptive updating or tuning of control parameters DB4, TD4 of a voltage control unit (41) controlling a second voltage control device (40), depending on instantaneous or actual operating conditions evaluated by the voltage control unit itself. Instead of using constant control parameters initially set by a commissioning engineer, the former are updated based on a voltage level U4, which in turn is responsive to or affected by any control action performed by a first voltage control device neighbouring the second voltage control device. The voltage control unit calculates a deviation of an instantaneous value of said voltage level from a reference value, and translates or maps this deviation to an update of its dead bands and / or time delay characteristics. Hence, the voltage control unit inherently anticipates, or determines a likelihood of, a control action of the first voltage control device, without the need for a real-time transmission of this piece of information to the voltage control unit.

Description

technical field [0001] The invention relates to the field of voltage control in power systems. It proceeds from the method of coordinated voltage control described in the preamble of claim 1 . Background technique [0002] Typically, the distribution network or grid has a radial structure and relays power from the feeder grid to loads distributed throughout the distribution point to any high voltage point with a loop-free path. Voltage control is required to ensure that each load receives the proper level of voltage and to stabilize the voltage as much as possible. In distribution networks, the main device for voltage regulation is the tap changer. The tap changer functions by adjusting the turns ratio between the primary winding and the secondary winding of the tap changing transformer and can thereby regulate the voltage on the secondary side. Another common device for voltage control is the compensator controller of the shunt compensator, such as capacitors and shunt ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/14
CPCG05F1/14
Inventor M·拉森K·西古尔德
Owner ABB RES LTD
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