Direct current voltage slope control method for multiport flexible direct current power transmission system

A technology of direct current transmission system and direct current voltage, which is applied in the direction of direct current network circuit devices, alternating current network circuits, electrical components, etc., and can solve problems such as inability to realize constant voltage control and static voltage deviation of direct current bus

Active Publication Date: 2015-02-25
SHENZHEN POWER SUPPLY BUREAU +1
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  • Abstract
  • Description
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Problems solved by technology

[0006] The traditional DC voltage slope control method achieves power distribution by allowing different converter stations to select different droop slopes K, but the DC bus will have a static voltage deviation, that is, it cannot achieve constant voltage control

Method used

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  • Direct current voltage slope control method for multiport flexible direct current power transmission system
  • Direct current voltage slope control method for multiport flexible direct current power transmission system
  • Direct current voltage slope control method for multiport flexible direct current power transmission system

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Embodiment

[0036]The method of the present invention is specifically described for a 5-terminal VSC-MTDC system connected to a wind power grid. Converter stations 1 and 2 are respectively connected to their respective active AC networks; converter station 3 is connected to the passive AC network to realize power supply to the passive network. Converter stations 4 and 5 are respectively connected to wind farms 1 and 2 to collect active power generated by the wind farms. The power direction is injected into the DC network as the positive direction. At the initial moment, the output power of wind farm 1 (converter station 4) is 185MW, the output power of wind farm 2 (converter station 5) is 150MW, and the output power of load-side converter station 3 is -25MW. The power allocated by converter station 2 is -117MW and -168MW respectively, the power reference values ​​of converter station 1 and converter station 2 are -118MW and -169MW respectively, and the DC bus voltage is stable at 400kV. ...

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Abstract

The invention relates to a direct current voltage slope control method for a multiport flexible direct current power transmission system and belongs to the technical field of power electronics. The method includes the steps of measuring the direct current voltage and active power of a convertor station connected with an active alternating current network, filtering out high frequency fluctuation components, judging whether the direct current voltage of the convertor station is within the preset allowable operating range or not after filtering is carried out, and if yes, judging whether the active power Pf of the convertor station reaches the steady-state value or not after filtering is carried out; if the Pf reaches the steady-state value, setting the active power of the convertor station as a new power reference value after filtering is carried out, and horizontally moving a direct current voltage-active power droop curve; if the Pf does not reach the steady-state value, setting the power corresponding to the direct current voltage of the convertor station after filtering is carried out as a new power reference value Pref, and horizontally moving the direct current voltage-active power droop curve. The direct current voltage can be controlled to be within the allowable operating range while rapid distribution of the wind power variation is ensured, and the system can operate safely and reliably.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a DC voltage slope control method for a multi-terminal flexible DC transmission system. Background technique [0002] In the 21st century, wind energy, as a renewable and clean energy, has been widely concerned and vigorously developed by the international community. Among them, the construction of large-scale offshore wind farms has become an important aspect of wind energy utilization. Flexible direct current transmission technology (VSC-HVDC) is currently the most suitable and widely used wind power grid-connected technology. When large-scale offshore wind power is developed, a multi-terminal direct current (VSC-MTDC) transmission system based on voltage source converters is required. The power generated by wind farms has the characteristics of randomness, intermittence and volatility, which lead to frequent changes in the power flow of the system. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00H02J3/36
CPCY02E60/60H02J3/36H02J2003/365
Inventor 袁志昌张海波赵宇明刘国伟姚森敬
Owner SHENZHEN POWER SUPPLY BUREAU
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