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Micro-grid active power oscillation damping control method for multiple virtual synchronous generators
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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, shorten transient response time, large communication time The effect of slack
Active Publication Date: 2019-04-26
LIYANG RES INST OF SOUTHEAST UNIV +1
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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
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Embodiment 1
[0033] The active power oscillation damping control method for multi-virtual synchronous machinemicrogrid, as shown in Figure 1, includes the following steps:
[0034] S1, obtain the output frequency of the virtual synchronous machine according to the local virtual synchronous machine model;
[0035] S11, the active frequency control model of a single virtual synchronous machine is as follows:
[0036]
[0037] 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;
[0038] S12, obtain the output power P of the virt...
Embodiment 2
[0051] For the multi-virtual synchronous machine microgrid active power oscillation damping control method, in this embodiment, there are n VSGs:
[0052] S1, obtain the output frequency of the virtual synchronous machine according to the local virtual synchronous machine model;
[0053] S2, exchange information between two adjacent virtual synchronous machines, and obtain the output frequency ω between adjacent virtual synchronous machines i1 , ω i2 … ω in ;
[0054] S3, according to the output frequency between all adjacent virtual synchronous machines, calculate the average output frequency between adjacent virtual synchronous machines
[0055] S4, calculate the mutual damping term according to the average output frequency obtained in step S3
[0056] 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.
[0057] ...
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Abstract
The invention discloses a micro-grid active power oscillation damping control method for multiple virtual synchronous generators. The micro-grid active power oscillation damping control method comprises the steps that firstly, according to a local virtual synchronous generator model, the output frequencies of the virtual synchronous generators are obtained, and every two adjacent virtual synchronous generators are subjected to information interaction to obtain the output frequencies between the adjacent virtual synchronous generators; and the average output frequency of the adjacent VSGs is obtained, and then a mutual damping term is obtained and added to an active frequency control loop; and finally, the output frequencies of the VSGs tend to be consistent at all times, the frequency oscillation is effectively suppressed, the power oscillation is minimized while improving the system frequency stability, and the micro-grid active power oscillation damping control method is more in linewith actual needs and more practical.
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...
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