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Frequency voltage slope control-based VSC convertor station control method

A control method and converter station technology, applied to a single AC network with different frequencies, electrical components, circuit devices, etc., can solve the problems of weakening the advantages of system interconnection, achieve the ability to enhance real-time mutual support, and improve stability Effect

Active Publication Date: 2016-08-17
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the converter station is controlled as a power source or load of a specified power, the advantages of system interconnection will be greatly weakened

Method used

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  • Frequency voltage slope control-based VSC convertor station control method
  • Frequency voltage slope control-based VSC convertor station control method
  • Frequency voltage slope control-based VSC convertor station control method

Examples

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Effect test

Embodiment

[0039] Figure 4 is the model used in the simulation, A, B, and C are three equivalent converter stations, the AC side of the converter station is respectively connected to three asynchronous AC power grids, and the DC side of the converter station is directly connected to form a node O; Such as Figure 5 As shown in (a), when t=20s, the AC side load of grid AC1 suddenly increases by 90MW, and the power transmitted from station A and station B to station C through the DC grid will increase (station A and station B transmit power to station C in steady state) , Figure 5 (b) and Figure 5 It can be seen from (c) that the increase in the load of the AC side grid AC3 at station C reduces the frequency of the three converter stations and the DC voltage at the port of the converter station, and the AC grid AC1 and AC2 automatically transmit more power to AC3 , to maintain the power balance of the entire AC / DC hybrid system. The three-side AC sub-grids jointly bear the increased p...

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Abstract

The invention discloses a frequency voltage slope control-based VSC convertor station control method which specifically comprises the following steps: (1) performing integral on DC side voltage deviation to obtain an AC side frequency adjustment quantity; (2) correcting the DC side voltage deviation by the frequency adjustment quantity obtained in the step (1) to form frequency voltage slope control; (3) adding a frequency set value to the frequency adjustment quantity in the step (1) to form a new frequency set value; and (4) performing integral on the new frequency set value in the step (3) to obtain a phase angle for generating a modulation waveform. By the control method disclosed by the invention, a power change of a DC line is represented by a voltage value of a DC port; the power requirements of an AC side power grid can be automatically met; and the AC side power grid shares the primary frequency regulation function of a whole system. A convertor station is controlled to be a frequency source, so that grid-connected operation or off-grid operation of an AC sub-system can be supported. Compared with an existing control method, the interactive capability of an AC sub-grid is improved; and the stability of a whole AD / DC interconnected power grid is enhanced.

Description

Technical field: [0001] The invention belongs to the technical field of inverter grid connection, and in particular relates to a VSC converter station control method based on frequency voltage slope control. Background technique: [0002] In recent years, new energy technologies such as wind energy and solar energy have been developed rapidly, but due to their intermittent and random characteristics, the traditional technology for the grid to accept ultra-large-scale renewable energy has been increasingly restricted. Studies have shown that multi-terminal flexible direct current Network technology is an effective technical means to solve this problem. [0003] In order to make the multi-terminal DC system connected with multiple asynchronous AC systems operate stably, the basic control requirements are to control the DC voltage of the entire network to maintain stability, maintain DC power balance, and prevent equipment such as converter valves, overhead lines, and cables fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J5/00H02J3/02
CPCH02J3/02H02J3/381H02J5/00H02J3/388
Inventor 王跃王浩段国朝王文媞李明烜徐宁一
Owner XI AN JIAOTONG UNIV
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