Flexible direct-current power transmission system power modulation method capable of realizing power reversion
A power modulation, flexible DC technology, applied in electrical components, power transmission AC networks, etc., can solve problems such as power loopback, power modulation errors, and insufficient flexibility and optimization of modulation power distribution, to achieve optimal control and power.
Active Publication Date: 2020-11-24
HENAN UNIVERSITY
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Problems solved by technology
[0005] Aiming at the deficiencies of the existing technology, the present invention proposes a power modulation method for a flexible direct current transmission system that can realize power inversion, which solves the problem of power modulation caused by the inflexible optimization of modulation power distribution of multiple converter units due to boosting or falling back Errors, power loopback and other issues, and realize the stable operation of the power balance and simultaneous reverse operation of the converter units of the flexible direct current transmission system with multiple converter units
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[0029] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0030] The invention provides a power modulation method of a flexible direct current transmission system capable of realizing power reversal. The direct current station control or leading unit passes through the data information such as the power mode, operating state, and power limit of each unit, and commutates according to the combined power mode. According to their respective power limits and actual power directions, the unit allocates and refreshes the operating power reference value of each converter unit according to the method of preferentially assigning power modulation reference values to the converter units in the combined power mode, and then performs instantaneous power up and down operations. figure 1 It is a structural schematic diagram of a flexible direct current transmission system composed of mult...
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The invention discloses a flexible direct-current power transmission system power modulation method capable of realizing power reversion. In the method, a power mode comprises a joint power mode and an independent power mode; the method is characterized in that when a control unit receives a power modulation command, power increase and decrease of all current conversion units are stopped; according to the power limit ratio and actual power direction of each current conversion unit, the operating power reference value of each current conversion unit is allocated and refreshed by each current conversion unit according to the method of giving priority to the power modulation reference value of a combined power mode current conversion unit, and then the instantaneous power rise and fall operation is performed. According to the method, the problems that the modulation power is difficult to distribute in different power modes of multiple current conversion units of the whole station, and themultiple current conversion units in the station cannot achieve power reversing or even power loopback are solved, and optimal control over the power of the whole station is achieved.
Description
technical field [0001] The invention belongs to the technical field of flexible DC power transmission in electric power systems, and can be used for power boosting and power reduction including a plurality of converter units in a converter station. Background technique [0002] With the increase of electricity demand and the advancement of power electronic devices and control technology, the capacity and voltage level of direct current transmission are getting higher and higher. Flexible DC transmission uses voltage source converters. Its unique full control feature avoids problems such as power oscillations and system instability caused by commutation failures of current-source converters. [0003] In order to meet the requirements of large-capacity power transmission, a new construction or expansion of a converter station needs to be composed of multiple converter units. When one side of the power grid is abnormal and needs emergency power boost or power drop (that is, po...
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IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/10Y02E60/60
Inventor 史蕊袁彩虹白晨希宋亚林杨扬
Owner HENAN UNIVERSITY