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Micro-grid voltage distributed control method based on electric spring

A technology of distributed control and electric spring, applied in the direction of AC network voltage adjustment, etc., can solve problems such as AC bus voltage steady-state deviation

Active Publication Date: 2019-04-26
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to provide a distributed control method of microgrid voltage based on multiple electric springs, aiming to solve the problem of large steady-state deviation of the AC bus voltage existing in the existing droop control method

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  • Micro-grid voltage distributed control method based on electric spring
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  • Micro-grid voltage distributed control method based on electric spring

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Embodiment Construction

[0069] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0070] The present invention provides a microgrid voltage distributed control method based on electric springs, including:

[0071] S1: if figure 1 As shown, assuming that each electric spring (ES: Electric Spring) controller is an agent, the information state of each agent is initialized, and the adjacent agents exchange information states in a distributed mode according to local information, and finally all agent information states converge to In the same state, the consensus value of the calculation system is used as the reference voltage;

[0072] Such as figure 1 As shown, the interaction o...

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Abstract

The invention discloses a micro-grid voltage distributed control method based on an electric spring. The method includes (1) adopting adjacent ES controllers to conduct information state exchange in the distributed mode according to local information to converge the states into the same state and acquire reference voltage; (2) monitoring the difference between the actual output voltage of the ES controllers and the reference voltage in real time to track and adjust the actual output voltage of the ES controllers; (3) converting the inductor current into the droop voltage, transmitting a difference signal with a control signal to a PWM modulator, returning a voltage signal to an inverter after modulation to form feedback regulation of the inverter output signal by the droop voltage and further achieve control of the ES voltage; (4) repeating the steps S2-S3 until the actual output voltage of the ES controllers is the reference voltage. Compared with the conventional droop control mode,the method can provide more accurate voltage control and can effectively avoid the occurrence of overvoltage phenomenon during the transient period.

Description

technical field [0001] The invention belongs to the field of application of power electronics in power systems, and more specifically relates to a distributed control method for micro-grid voltage based on multiple electric springs. Background technique [0002] Currently, the power system operates in such a way that the amount of power generated is based on the needs of the users. The grid-connected capacity of renewable energy such as wind energy is increasing year by year. The intermittent nature and instability of new energy make it difficult to accurately predict the total power generation, which may cause a mismatch between the power demand of users and the power provided by the grid. At the same time, the The influence of the power system is becoming more and more obvious, such as harmonic pollution, voltage fluctuation and frequency flicker. [0003] For grid voltage fluctuations, the current technical means are mainly bus voltage control and centralized communicati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/12
CPCH02J3/12
Inventor 陈霞黄煜彬石梦璇周建宇文劲宇
Owner HUAZHONG UNIV OF SCI & TECH
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