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MMC power operation interval optimization method based on energy flow rule

An interval-optimized, energy-flowing technology used in the power field

Inactive Publication Date: 2020-04-10
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0004] So far, there are relatively few converter station optimization controls for the MMC-HVDC system to achieve AC side fault ride-through in the case of AC side faults. Existing methods include deadbeat direct current control, non-phase-locked loop control, sequence component method, etc. However, there are still some problems to be solved urgently, such as the lack of dynamic flow process of system energy when the AC side is faulty, analysis of the internal energy mechanism of the converter, and optimization of the operating power range of the system, etc.

Method used

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  • MMC power operation interval optimization method based on energy flow rule
  • MMC power operation interval optimization method based on energy flow rule
  • MMC power operation interval optimization method based on energy flow rule

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the drawings and specific implementation process.

[0018] see figure 1 , to analyze the fault characteristics of the AC side of the MMC-HVDC system, it is first necessary to build the MMC-HVDC simulation model in ADPSS, including the AC system interface, DC line, converter stations at both ends, converter transformer, and data conversion interface. Through the "interface variable", the control system built by the model is associated with the built primary system for simulation research of the DC transmission system, and various faults on the AC side are simulated, such as two-phase short-circuit faults, disconnection faults, single-phase ground faults, Two-phase ground faults, three-phase short-circuit faults, and impedance imbalances are used to obtain fault equivalent circuit models. At the same time, model parameters, boundary conditions, and fault duration are adjusted to fully consider vario...

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Abstract

The invention discloses an MMC power operation interval optimization method based on an energy flow rule, and the method can achieve the maximum power transmission of a flexible DC power transmission(MMC-HVDC) system under an AC side fault. Firstly, fault feature analysis is carried out on an alternating current side; an energy distribution condition and an instantaneous energy fluctuation characteristic under different fault types of the alternating current side are understood, a coupling relationship between an energy dynamic process and each electrical parameter of the system is constructed, and the energy conversion rule of the flexible DC power transmission system is found, so that an MMC operation power interval is optimized based on the energy conversion rule, the analytical expression of the maximum active power transmission capability of the MMC under different fault working conditions is constructed, and the optimal energy distribution of the MMC-HVDC system is determined.

Description

technical field [0001] The invention relates to maximum power transmission under AC side failure of a flexible direct current transmission (MMC-HVDC) system, in particular to an MMC power operation interval optimization method based on energy flow rules when the system AC side fails, and belongs to the field of electric power technology. Background technique [0002] Modular Multilevel Converter (MMC) high-voltage flexible DC transmission technology is a new generation of DC transmission technology with voltage source converter as the core, and it is the commanding height of power electronics technology application in the world today. [0003] The faults of the flexible HVDC transmission system include internal faults of the converter, faults on the DC side and faults on the AC side. Among them, there are many mechanisms for AC side faults. When the AC grid is asymmetrical, the current on the AC side of the MMC converter will be unbalanced, and the sum of the three-phase ins...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 夏向阳石超刘远
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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