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Frequency recovery method and system of photovoltaic microgrid

Zheng Tianwen, +5 more
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TLDR
In this article, a frequency recovery method and system of a photovoltaic microgrid is described, which comprises the steps of determining a virtual electric angular speed output from a virtual synchronous power generator, acquiring a set electric angular speeds, and acquiring state quantity to be controlled.
Abstract: 
The invention discloses a frequency recovery method and system of a photovoltaic microgrid. The method comprises the steps of determining a virtual electric angular speed output from a virtual synchronous power generator, acquiring a set electric angular speed, and acquiring state quantity to be controlled, wherein the state quantity to be controlled is a specific value between an actual value of an active power output from the virtual synchronous power generator and maximum power value which can be output from the virtual synchronous power generator; determining a derivation formula of the state quantity to be controlled on time t according to a distribution consistency algorithm; calculating to obtain control quantity according to the derivation formula, the virtual electric angular speed output from the virtual synchronous power generator and the set electric angular speed of the virtual synchronous power generator; adjusting the actual value of the active power output from the virtual synchronous power generator by using the control quantity. The frequency modulation characteristic of a power system and the consistency algorithm are combined, thus, all photovoltaic power supplies with different properties can output according to proportions consistent with maximum available capacity, and moreover, a frequency of the system is adjusted and recovered to a set value.

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Patent

Distributed control method and system for hybrid power distribution network based on consistency iteration algorithm

Pei Xuejun, +6 more
TL;DR: In this article, the authors proposed a distributed control method and system for a hybrid power distribution network based on a consistency iteration algorithm, which comprises the steps that a local current converter performs information interaction with an adjacent current converter, and the active power Pg and reactive power Qg of a feed line connected with the local current converters are collected.
Patent

Multi-photovoltaic-power-station cooperative frequency modulation system based on neighborhood communication and control method

Feng Haotian
TL;DR: In this article, a multi-photovoltaic-power-station cooperative frequency modulation system based on neighborhood communication and a control method is proposed, which consists of photovoltaic power stations and a power grid.
References
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Patent

Static synchronous generators

George Weiss, +1 more
TL;DR: In this article, the authors present a method for controlling an inverter associated with a power source, which typically will be a distributed power source and a feedback loop in which deviation of the rotational speed of the virtual generator rotor from a reference angular speed is detected and is used to adjust the virtual drive torque, thereby to regulate the rotor and hence the frequency of the AC output and the real power supplied by it.
Patent

Self-adaptive adjustment-based frequency control method for virtual synchronous generator

Zheng Tianwen, +4 more
TL;DR: In this paper, a self-adaptive adjustment-based frequency control method for a virtual synchronous generator is presented, which is capable of quickly responding to the load change to realize the non-error adjustment of the system frequency.
Patent

Regulation and control method for improving transient frequency stability of low-voltage micro-grid

Ma Ming, +9 more
TL;DR: In this paper, a regulation and control method for improving transient frequency stability of a low-voltage micro-grid was proposed, where an electrical angular speed deviation delta omega and a virtual damping coefficient D were taken as regulating indexes for P/omega droop control.