Unlock instant, AI-driven research and patent intelligence for your innovation.
Active power oscillation damping control method for multi-virtual synchronous machine microgrid
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A virtual synchronous machine, oscillation damping technology, applied in the direction of reducing/preventing power oscillation, circuit devices, AC network circuits, etc., can solve problems such as power oscillation, improve frequency stability, suppress active frequency oscillation, and shorten transient response the effect of time
Active Publication Date: 2021-07-20
LIYANG RES INST OF SOUTHEAST UNIV +1
View PDF19 Cites 0 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
However, VSG technology inevitably introduces the rotor oscillation characteristics of SG, especially when multiple VSGs are running in parallel, it is easy to cause power oscillation under disturbance
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0032] The active power oscillation damping control method for multi-virtual synchronous machine microgrid, as shown in Figure 1, includes the following steps:
[0033] S1, obtain the output frequency of the virtual synchronous machine according to the local virtual synchronous machine model;
[0034] S11, the active frequency control model of a single virtual synchronous machine is as follows:
[0035]
[0036] In the formula, P m ,P e are the mechanical power and electromagnetic power of the virtual synchronous machine, respectively; P 0 , ω 0 are the mechanical power and angular velocity of the virtual synchronous machine working under rated conditions; D and J are the damping coefficient and moment of inertia of the virtual synchronous machine respectively; ω, ω g are the angular velocity of the virtual synchronous machine and the synchronous angular velocity of the grid side; K ω is the active droop coefficient;
[0037] S12, obtain the output power P of the virt...
Embodiment 2
[0050] For the multi-virtual synchronous machine microgrid active power oscillation damping control method, in this embodiment, there are n VSGs:
[0051] S1, obtain the output frequency of the virtual synchronous machine according to the local virtual synchronous machine model;
[0052] S2, exchange information between two adjacent virtual synchronous machines, and obtain the output frequency X between adjacent virtual synchronous machines i1 、X i2 …X in ;
[0053] S3, according to the output frequency between all adjacent virtual synchronous machines, calculate the average output frequency between adjacent virtual synchronous machines
[0054] S4, calculate the mutual damping term according to the average output frequency obtained in step S3
[0055] S5, adding a mutual damping term in the active frequency control loop of the virtual synchronous machine, so that the output frequency of each virtual synchronous machine tends to be consistent at all times.
[0056] So...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
PUM
Login to View More
Abstract
The patent of the present invention discloses a multi-virtual synchronous machinemicrogrid active power oscillation damping control method. First, the output frequency of the virtual synchronous machine is obtained according to the local virtual synchronous machine model, and two adjacent virtual synchronous machines are exchanged information to obtain each phase The output frequency between adjacent virtual synchronous machines, and calculate the average output frequency of adjacent VSG, and then calculate the mutual damping term and add it to the active frequency control loop, so that the output frequency of each VSG tends to be consistent at all times, effectively suppressing frequency oscillation, While improving the system frequency stability, the power oscillation is reduced as much as possible, which is more in line with actual needs and has higher practicability.
Description
[0001] Field [0002] The invention relates to the field of frequency control of a power system micro-grid, in particular to a multi-virtual synchronous machine-oriented micro-grid active power oscillation damping control method. Background technique [0003] In order to cope with the increasingly severe energy crisis, the distributed power generation technology based on renewable energy has received more and more attention. The distributed power generation with the inverter as the grid-connected interface lacks the necessary inertia and the frequency stability is poor. Poor, will affect the stable operation of the large power grid; in addition, compared with the distributed powerpenetration rate of the micro-grid and large power grid, it is easier to receive external disturbances and lose the ability to operate stably. [0004] The basic principle of virtual synchronous generator control strategy (virtual synchronous generator, VSG) is to simulate the transient characteristi...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More 
Login to View More