Self-adaptive virtual synchronous generator cascade micro-grid control method

A virtual synchronization and control method technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems of complex control algorithms and unsatisfactory effects

Pending Publication Date: 2022-04-22
CENT SOUTH UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The existing method is to use droop control, the co

Method used

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  • Self-adaptive virtual synchronous generator cascade micro-grid control method
  • Self-adaptive virtual synchronous generator cascade micro-grid control method
  • Self-adaptive virtual synchronous generator cascade micro-grid control method

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Embodiment

[0035] 1. Cascade inverter system structure

[0036] 1.1 Cascade inverter control strategy

[0037] The system control structure that the present invention proposes is as follows figure 1 shown, where u 0 with i 0 are the load side output voltage and load side output current; P and Q are u 0 with i 0 Active power and reactive power obtained through power calculation; P ref with Q ref is the reference value of active power and reactive power; E m and θ is the output potential amplitude and phase angle of VSG; ω s is the angular frequency deviation; dω / dt is the rate of change of angular frequency; dP / dt is the rate of change of active power; ΔJ is the change of virtual inertia; ΔD is the change of damping coefficient, θ L Represents the phase angle at the load end, lZ L l represents the amplitude at the load end.

[0038] Let the output active power of the i-th inverter in the figure be P i , the reactive power is Q i , the phase angle of the inverter output of the ...

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Abstract

The invention discloses a self-adaptive virtual synchronous generator cascade micro-grid control method. A fuzzy controller is adopted to control a virtual synchronous generator cascade micro-grid. The input quantity of the fuzzy controller is omega s, domega/dt, and the output quantity of the fuzzy controller is delta J and delta D; omega s is angular frequency deviation; domega/dt is an angular frequency change rate; delta J is the variable quantity of the virtual inertia; delta D is the variable quantity of the damping coefficient; performing normalization processing on omega s and domega/dt by using quantization factors k1 and k2; the fuzzy controller obtains delta J and delta D through a given fuzzy rule and defuzzification reasoning. According to the change rule of the angular frequency change rate and the angular frequency variation of the synchronous generator, the oscillation period is subdivided and improved, the fuzzy rule table is redesigned, and the virtual inertia and the damping coefficient are adjusted, so that the control effect of the VSG is improved.

Description

technical field [0001] The invention relates to an adaptive virtual synchronous generator cascaded microgrid control method. Background technique [0002] In order to solve energy problems and alleviate environmental pollution, countries around the world are actively looking for ways to improve energy efficiency and actively develop new energy sources. However, in the process of integrating new energy into the traditional centralized power grid, there are problems such as scattered distribution, small capacity, and intermittent and fluctuating energy. In order to solve these problems, the American Association for Reliability Technology Solutions (CERTS) proposed the concept of microgrid in 2002. [0003] Microgrid refers to a regional grid composed of local loads, renewable energy and energy storage devices. According to the connection mode of micro-source inverters in microgrids, it can be divided into cascaded microgrids and parallel microgrids. Among them, the cascaded ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/24H02J3/00
CPCH02J3/38H02J3/24H02J3/241H02J3/002H02J2203/10H02J2203/20
Inventor 于晶荣申鸿哲邹勇军周仁友孙文
Owner CENT SOUTH UNIV
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