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Power distribution and parameter adaptive control method of multi-machine parallel virtual-synchronous generators

A technology of self-adaptive control and generator power, applied in the direction of photovoltaic power generation, single-net parallel feeding arrangement, etc., can solve the problems that photovoltaics cannot be fully utilized, renewable energy can not be guaranteed, and achieve reasonable fairness and optimization effect, an effect that adds inertia and damping

Active Publication Date: 2018-01-09
HEFEI UNIV OF TECH
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Problems solved by technology

When the virtual synchronous generator integrated with photovoltaic and energy storage units on the DC side operates in an isolated island, if the load power distribution is improper, the output power of some virtual synchronous generators may be smaller than its DC side photovoltaic output, and the DC side photovoltaics cannot be fully utilized. However, the output power of some virtual synchronous generators is greater than its DC-side photovoltaic output, and energy storage units are required to compensate for the power shortage, which cannot guarantee the maximum utilization of renewable energy

Method used

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  • Power distribution and parameter adaptive control method of multi-machine parallel virtual-synchronous generators
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  • Power distribution and parameter adaptive control method of multi-machine parallel virtual-synchronous generators

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Embodiment Construction

[0052] The control structure of the microgrid system is as follows: figure 1 As shown, it is composed of a photovoltaic unit, an energy storage unit and an inverter unit controlled by a virtual synchronous generator. The control structure of each virtual synchronous generator is consistent, and the DC side integrates photovoltaic units and energy storage units.

[0053] In this embodiment, the multi-machine parallel virtual synchronous generator power distribution and parameter adaptive control method are carried out according to the following steps:

[0054] Step 1. Establish a small-signal model for parallel operation of n virtual synchronous generators, and obtain the transfer function G between the output power of the i-th virtual synchronous generator and the load power pli (i=1,2...n), analyze the dynamic response characteristics of parallel virtual synchronous generators and the influence of parameters on dynamic characteristics.

[0055] First, the active loops and p...

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Abstract

The invention discloses a power distribution and parameter adaptive control method of multi-machine parallel virtual-synchronous generators. The method includes: firstly, establishing a small signal model for parallel operation of n virtual-synchronous generators, acquiring a transfer function Gpli between output power and load power of the ith virtual-synchronous generator and then enabling parameters of the virtual-synchronous generators running in parallel to be mutually proportioned to acquire constraint conditions matched with parameters; by the aid of the constraint conditions matched with the parameters, acquiring control parameters of the virtual-synchronous generators of a microgrid system under different running modes. The power distribution and parameter adaptive control methodis applicable to an independent optical storage microgrid system, output power of a direct-current side is fully considered, reasonable and fair distribution of the power on the premise of priority utilization of photovoltaic power is realized, and utilization rate of renewable energy sources of photovoltaic is increased.

Description

technical field [0001] The invention relates to the technical field of virtual synchronous generators, and is applied to occasions such as optical storage microgrids, and more specifically relates to a multi-machine parallel virtual synchronous generator power distribution and parameter adaptive control method. Background technique [0002] Distributed power sources in microgrids that use renewable energy such as photovoltaics and wind power as the main body are generally connected to the power system through power electronic inverters. The inverter is flexible in control and fast in response, but it is a static component with almost no inertia. Renewable energy output is easily affected by the environment, has large fluctuations and randomness, and it is difficult to meet the requirements of grid friendliness. With the increase of the penetration rate of renewable energy, the inertia of the system is significantly reduced, and the frequency is more sensitive to the fluctuat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/56
Inventor 茆美琴钱程张榴晨
Owner HEFEI UNIV OF TECH
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