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PI parameter optimization method and system in MMC control system of flexible DC power distribution network

A flexible DC power distribution and control system technology, applied in the field of PI parameter optimization method and its system, can solve the problems of high experience and skills, unstable output response overshoot, and difficulty in obtaining satisfactory results, and achieves the suppression of bridge arm circulation, The effect of reducing errors, improving power supply reliability and operational safety

Pending Publication Date: 2020-10-30
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its PI controller has a simple structure; in the actual process, the tuning of PI parameters often adopts the trial and error method or experience method, and high experience and skills are required for operation and adjustment, and it is not easy to obtain satisfactory results
Proportional control can quickly respond to errors, fast and small steady-state errors, and the overshooting of the output response will be unstable if the proportional amplification factor is too large

Method used

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  • PI parameter optimization method and system in MMC control system of flexible DC power distribution network
  • PI parameter optimization method and system in MMC control system of flexible DC power distribution network
  • PI parameter optimization method and system in MMC control system of flexible DC power distribution network

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Embodiment 1

[0055] In this embodiment, the flexible DC power distribution system adopts the two-end pseudo-bipolar main connection mode, and the system structure is as follows figure 1 As shown, the wiring structure is symmetrical, the power supply reliability is high, and the expansion is strong. The converter stations are all MMC modular multilevel converters. The DC output side of the converter has a voltage level of 10kV and a rated capacity of 25MW. Connect with DC-DC DC transformer and DC-AC converter, and connect corresponding DC and AC loads.

[0056] Schematic diagram of MMC structure as figure 2 As shown, there are two upper and lower bridge arms in each phase unit. According to Kirchhoff’s voltage law, the voltage differential equations of the upper and lower bridge arm circuits can be listed. After abc-dq coordinate transformation and Laplace transformation, Get the control function, the control strategy obtained according to the control function, the final control function ...

Embodiment 2

[0085] On the basis of Embodiment 1, this embodiment proposes a PI parameter optimization system in the MMC control system of the flexible DC distribution network, including:

[0086] PI outer loop parameter tuning model building module, used to build the decoupled PI outer loop parameter tuning model;

[0087] The optimization function building block of PI outer loop parameters is used to construct the optimization function of the PI outer loop parameters in the PI outer loop parameter tuning model based on the ITAE index;

[0088] The optimization function solving module is used to solve the optimization function of the PI outer loop parameters by using the genetic algorithm to obtain the best PI outer loop parameters.

[0089] The PI outer loop parameter setting model building module of the present embodiment includes:

[0090] The current sampling module is used to obtain the actual value of the d-axis current i when the flexible DC distribution network is running stably ...

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Abstract

The invention discloses a PI parameter optimization method and a PI parameter optimization system in an MMC control system of a flexible DC power distribution network. The PI parameter optimization method comprises the following steps: step 1, establishing a decoupled PI parameter setting model; step 2, constructing an optimization function of PI parameters in the PI parameter setting model basedon ITAE indexes; and step 3, solving the optimization function by adopting a genetic algorithm, stopping searching when the number of iterations reaches a certain number or the precision meets the convergence requirement, and outputting an optimal PI parameter.

Description

technical field [0001] The invention relates to the technical field of flexible DC power distribution, in particular to a method for optimizing PI parameters in an MMC control system of a flexible DC power distribution network and a system thereof. Background technique [0002] The topological structure of the flexible DC power distribution system is diverse, and the main circuit wiring method of the system is complex, including two or more converters, and the number of sub-modules in the converter is large, mostly dozens or even hundreds of Power electronic components have high switching frequency and fast action speed. The transient process when a fault occurs is relatively short, and the response speed of the DC power grid to power disturbance is extremely fast, which is 3 orders of magnitude faster than the general AC system. The control method is complex. Among them, the module The control mode of the multilevel converter MMC has an important influence on the operation ...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02M7/49
CPCH02J3/36H02M7/49H02J2203/20Y02E60/60
Inventor 杨景刚张晓荣苏伟王树刚袁栋肖小龙史明明袁宇波孙秋芹刘瑞煌司鑫尧郭佳豪
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST