A power coordinated control method for a multi-converter unit flexible direct current transmission system
A commutation unit and coordinated control technology, which is applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc. Achieve optimal control, avoid power coordination difficulties, and avoid power loss effects
Active Publication Date: 2022-02-01
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 coordination control method for a multi-converter unit flexible direct current transmission system, which solves the problems of power loss, power sudden increase, power Oscillation and other problems, realized the optimal operation of power coordination distribution control of flexible DC transmission system with multiple converter units
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[0027] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0028] The invention provides a power coordination control method of a multi-converter unit flexible direct current transmission system. The direct current station control or leading unit passes through the data information such as the power mode, operation status and power limit value of each unit, and commutates according to the joint power mode. The strategy method of assigning the reference value of the operating power to the units according to their respective power limits in equal proportions, calculates the operating power reference value and power rise and fall rate that each converter unit needs to bear, and sends them to each converter unit for execution. figure 1 It is a structural schematic diagram of a flexible direct current transmission system composed of multiple symmetrical unipolar converter units ap...
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The invention provides a power coordination control method of a multi-converter unit flexible direct current transmission system. The direct current station control or leading unit passes through the data information such as the power mode, operation status and power limit value of each unit, and commutates according to the joint power mode. The strategy method of assigning the reference value of operating power to the units according to their respective power limits in equal proportions, calculates the operating power reference value and power up and down rate required by each converter unit, and sends them to each converter unit for execution, which can be effectively Avoid the problem of difficult power coordination under different power modes of multiple converter units in the whole station, and the problem that the operating power reference value of multiple converter units in the station cannot be issued due to different active power control modes, and realize the optimal control of the power of the whole station, thereby Problems such as power loss, power surge, and power instability caused by power distribution and transfer errors are avoided.
Description
technical field [0001] The invention belongs to the technical field of electric power system flexible direct current transmission, and can be used for the coordinated distribution of power 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. Compared with the coordinated power distribution of a single or two converter units, the reliabil...
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IPC IPC(8): H02J3/36H02M7/00
CPCH02J3/36H02M7/00Y02E60/60
Inventor 史蕊袁彩虹白晨希翟锐宋亚林
Owner HENAN UNIVERSITY