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High-voltage static var generator (SVG) without starting circuit and method for connecting SVG to power grid

A static reactive power, no-start technology, applied in reactive power adjustment/elimination/compensation, single-grid parallel feeding arrangement, flexible AC power transmission system, etc. and other problems, to achieve the effect of simple operation, high degree of automation, and short time for grid connection.

Inactive Publication Date: 2011-06-01
DANDONG XINTAI ELECTRIC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the conventional high-voltage static var generator is connected to the grid, a special start-up circuit is required to detect the relevant parameters of the high-voltage static var generator system and the power supply system, and the high-voltage static var generator can be connected to the grid after adjustment , the entire grid connection process is not only complex in equipment structure and operation process, but also bulky, long in grid connection time, and low in automation

Method used

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  • High-voltage static var generator (SVG) without starting circuit and method for connecting SVG to power grid
  • High-voltage static var generator (SVG) without starting circuit and method for connecting SVG to power grid
  • High-voltage static var generator (SVG) without starting circuit and method for connecting SVG to power grid

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the drawings.

[0020] The basic structure of the high-voltage static var generator without starting loop is as follows figure 1 As shown, it is composed of primary switch cabinet 1, connecting reactor cabinet 2, power unit cabinet 3 and control system device 4. Among them: primary switch cabinet 1 is equipped with main switch 1-1, control switch 1-2 and system interface 1. -3; Connecting reactor cabinet 2 is equipped with current limiting resistor 2-1 and connected reactor 2-2; power unit cabinet 3 is equipped with inverter 3-1 and DC side capacitor 3-2. The connection relationship between primary switch cabinet 1, connecting reactor cabinet 2, power unit cabinet 3 and control system device 4 is as follows: figure 2 Shown: the static contact of the main switch 1-1 and the static contact of the control switch 1-2 are connected in parallel with one end of the control system device 4 to form the system...

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Abstract

The invention relates to a high-voltage static var generator (SVG) without a starting circuit and a method for connecting the SVG to a power grid, which can realize safe power grid connection without a starting circuit. The high-voltage SVG is characterized in that after being connected in parallel, a static contact of a master switch and a static contact of a control switch form a system interface with one end of a control system device; a moving contact of the control switch is connected with the input end of a current-limiting resistor; the output end of the current-limiting resistor is connected to the input end of a reactor after being connected with a moving contact of the master switch in parallel; the output end of the reactor is connected with an inverter; and a direct current-side capacitor is externally connected with the inverter. The high-voltage SVG and the method have the following positive effects: the special starting circuit is omitted, the current-limiting resistor and the power grid connection assisting switch are added, and the traditional starting circuit is replaced by the current-limiting resistor, the assisting switch and the control device; and after power grid connection, the current-limiting resistor is automatically short-connected via the master switch, and the high-voltage SVG is changed to the working state, thus realizing safe, rapid and automatic power grid connection.

Description

Technical field [0001] The invention relates to a high-voltage reactive power compensation device for a power system, in particular to a high-voltage static reactive power generator without a starting circuit capable of achieving safe grid connection without a starting circuit and a grid connection method thereof. Background technique [0002] With the widespread use of high-power power electronic converter devices, harmonic and reactive power problems have attracted more and more attention. At present, as one of the high-voltage reactive power compensation devices, the high-voltage static synchronous compensation device (STATCOM) has become an important part of the flexible AC transmission system (FACTS) due to its superior performance. It is also the latest static synchronous compensation device. The product high-voltage static reactive power generator (SVG) shows the development direction of dynamic reactive power compensation device with its superior performance. Because the...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/38
CPCY02E40/12Y02E40/10
Inventor 巩志强张科胡森
Owner DANDONG XINTAI ELECTRIC
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