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Parameter optimization method and system for suppressing transient overvoltage of direct current system

A transient overvoltage, DC system technology, applied in the direction of emergency protection circuit devices, AC network circuits, circuit devices, etc. for limiting overcurrent/overvoltage, it can solve complex mechanisms and analysis methods, complex control systems, and communication problems. The problem of increasing nonlinearity of the DC power grid, etc., to achieve the effect of suppressing transient overvoltage and optimal transient overvoltage

Pending Publication Date: 2022-05-13
NORTH CHINA ELECTRICAL POWER RES INST +3
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Problems solved by technology

However, the transmission of large-scale wind power through the HVDC transmission system has also brought new problems to the power system.
The access of the DC system will further complicate the transient voltage stability problem, especially the transient voltage stability problem of the weak sending end power grid
Since the DC system contains a large number of dynamic components and the control system is complex, the degree of nonlinearity of the AC-DC grid is greatly increased, and the mechanism and analysis methods of the voltage stability of the AC-DC grid are more complicated. How to suppress the transient overvoltage of the DC system has become an urgent need. Technical issues resolved

Method used

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  • Parameter optimization method and system for suppressing transient overvoltage of direct current system
  • Parameter optimization method and system for suppressing transient overvoltage of direct current system
  • Parameter optimization method and system for suppressing transient overvoltage of direct current system

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Embodiment 2

[0141] Embodiment 2 is a specific implementation manner of Embodiment 1 of the present invention.

[0142] Using PSCAD standard DC transmission simulation model and CIGRE_Benchmark for DC system simulation verification, the topology of the CIGRE_Benchmark simulation model is as follows Image 6 shown. Unipolar 500kV, 1000MW DC transmission is adopted, and 12-pulse converters are used on both the rectification side and the inverter side, connected to a weak AC system (short-circuit ratio is 2.5 when the frequency is 50Hz).

[0143] 1. Simulation verification of transient overvoltage characteristics at the sending end

[0144] The formation mechanism of the transient overvoltage is described through mathematical model derivation. In this embodiment, the characteristics of the transient overvoltage at the sending end are verified through the simulation of the CIGRE_Benchmark model. Set a three-phase short-circuit fault starting from 4s and lasting 0.2s at the AC busbar at the r...

Embodiment 3

[0155] A parameter optimization system for suppressing transient overvoltage of a DC system, the system comprising:

[0156] The parameters to be optimized determination module is used to determine the parameters to be optimized in the DC system and construct an objective function for parameter optimization.

[0157] The parameters to be optimized include the proportional coefficient K of the PI regulator in the DC system p and the integral time constant T i , and the minimum current command I of the low-voltage current-limiting link in the DC system L , the maximum current command I H , starting voltage U L and exit voltage U H , the parameter sequence to be optimized is [T i , K P , I L , U L , U H , I H ].

[0158] The objective function is: Among them, S is the target number, U g is the effective value of the overvoltage of the DC system, U w is the steady-state voltage effective value of the DC system, t 1 and t 2 are the start time and end time of the ov...

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Abstract

The invention relates to a parameter optimization method and system for suppressing transient overvoltage of a direct current system, and the method comprises the following steps: determining a to-be-optimized parameter in the direct current system, and constructing a target function for parameter optimization; according to the trajectory sensitivity of the target function to each to-be-optimized parameter, sorting the to-be-optimized parameters in a descending order of the trajectory sensitivity to obtain a to-be-optimized parameter sequence; segmenting the to-be-optimized parameter sequence into a plurality of to-be-optimized parameter subsequences; and optimizing the to-be-optimized parameters in each to-be-optimized parameter sub-sequence by using the genetic algorithm in sequence by taking the optimization of the target function as a target. According to the method, firstly, sensitivity analysis is carried out on the control parameters of the direct-current system, priority ranking is carried out on all the parameters to be optimized, then the parameters to be optimized are grouped according to the sample space of the parameters to be optimized, and finally optimization is carried out on each group of parameters to be optimized in sequence through a genetic algorithm to obtain the most suitable control parameters. And the optimal transient overvoltage suppression effect is achieved.

Description

technical field [0001] The invention relates to the technical field of direct current transmission, in particular to a parameter optimization method and system for suppressing transient overvoltage of a direct current system. Background technique [0002] In recent years, new energy power generation represented by wind power and high-voltage direct current transmission have been developed on a large scale. However, sending large-scale wind power through the HVDC transmission system also brings new problems to the power system. The access of the DC system will further complicate the transient voltage stability problem, especially the transient voltage stability problem of the weak sending-end power grid. Since the DC system contains a large number of dynamic components and the control system is complex, the degree of nonlinearity of the AC-DC grid is greatly increased, and the mechanism and analysis methods of the voltage stability of the AC-DC grid are more complicated. How...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/38H02H9/04G06N3/12
CPCH02J3/36H02J3/381H02H9/04G06N3/126H02J2300/28
Inventor 吴林林杜维柱李蕴红王潇陈璨徐曼孙大卫程雪坤于思奇张瑞芳
Owner NORTH CHINA ELECTRICAL POWER RES INST
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