Multi-direct-current power spring voltage stabilization control method

A power spring, smooth control technology, applied in the direction of DC network circuit devices, electrical components, circuit devices, etc., can solve problems such as adverse effects, achieve wide stability domain, compensate for input voltage deviation, and achieve the effect of linear transformation

Active Publication Date: 2021-11-12
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is exactly to provide a kind of multi-DC power spring voltage steady control method in order to overcome the defective that above-mentioned prior art exists, to solve the bad influence that communication time delay produces on multi-DCES consistency control

Method used

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  • Multi-direct-current power spring voltage stabilization control method
  • Multi-direct-current power spring voltage stabilization control method
  • Multi-direct-current power spring voltage stabilization control method

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Experimental program
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Embodiment

[0065] Such as figure 1 As shown, a multi-DC electric spring voltage steady control method includes the following steps:

[0066] S1. Construct the outer loop power pinning consistency control law considering the communication delay, in order to obtain the expected trajectory of each DC bus voltage, specifically:

[0067] S11. Based on the global average voltage target constraint of the DC microgrid, by considering the communication delay, calculate and obtain the voltage error signal of each bus;

[0068] S12. Taking each busbar voltage error signal as compensation, combined with the ideal operating voltage of the key load, the expected value of each DC busbar voltage can be obtained;

[0069] Among them, the global average voltage target constraint of the DC microgrid is:

[0070]

[0071] In the formula, V i is the voltage of DC bus i, V ref is the ideal working voltage of the key load, and n is the total number of DC buses;

[0072] The bus voltage error signal is ...

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Abstract

The invention relates to a voltage stabilization control method for a multi-direct-current power spring, and the method comprises the following steps: constructing an outer loop power containment consistency control law considering communication time delay, so as to obtain a voltage expected track of each direct-current bus; constructing a differential smoothing control law of a dynamic reversible characteristic, and obtaining a DCES filter inductive current expected track in combination with each DC bus voltage expected track; based on a current inner loop design of model prediction control, taking the DCES filter inductive current expected track as a tracking control target, and obtaining a corresponding DCES working mode; and correspondingly changing the working state of the switch in each DCES according to the working mode of the DCES. Compared with the prior art, starting from the nonlinear nature of the multi-DCES system of the DC micro-grid containing the communication time delay, the control method disclosed by the invention can quickly compensate the multi-DCES distributed voltage control deviation caused by the unknown time-varying communication time delay, and has the advantages of small calculation amount, good stability and strong robustness.

Description

technical field [0001] The invention relates to the technical field of DC electric spring control, in particular to a method for stabilizing the voltage of multiple DC electric springs. Background technique [0002] When the high penetration rate of renewable energy is connected to the DC microgrid, due to the intermittent and random nature of photovoltaic and wind power generation, it is easy to cause DC bus voltage fluctuations, which will inevitably have a significant impact on the power quality of the user side. As a new demand-side management technology, DC electric spring (DCES) aims at the stable control of critical load (CL) voltage, and forms an intelligent Load, transfer part of the DC bus voltage fluctuation to NCL, so as to realize the stable DC bus voltage under the situation of renewable energy output fluctuation, improve the power quality of the user side, and at the same time reduce the demand for energy storage battery capacity as much as possible, which has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00
CPCH02J1/00
Inventor 薛花王育飞张晓雯钦佳南凌晨张宇华于艾清
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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