Parameter configuration method for multi-machine parallel dynamic consistent response of microgrid virtual synchronous machine

A parameter configuration method and virtual synchronous machine technology, which are applied in circuit devices, AC network circuits, single-network parallel feeding arrangements, etc., can solve the problems of different VSG dynamic performance, long time, power distribution error, etc.

Active Publication Date: 2018-11-30
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0003] For virtual synchronous machines running in parallel, if the control parameters are not designed properly, then the frequency dynamic response and power distribution in the transient process will be a big problem
During the transition period, the dynamic performance of each VSG may be different and errors in power allocation may occur
In addition, frequency oscillation takes a long time to resolve, which is unavoidable in any power system, and this poses a challenge to the steady-state operation of the power system

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  • Parameter configuration method for multi-machine parallel dynamic consistent response of microgrid virtual synchronous machine
  • Parameter configuration method for multi-machine parallel dynamic consistent response of microgrid virtual synchronous machine
  • Parameter configuration method for multi-machine parallel dynamic consistent response of microgrid virtual synchronous machine

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Embodiment Construction

[0038] The invention will be described in further detail below with reference to the accompanying drawings.

[0039] figure 1 , the VSG control system mainly includes: VSG core algorithm, voltage and current control, virtual impedance, coordinate transformation of abc and dq coordinates, power calculation. The VSG core algorithm includes: power frequency control equation, reactive power control loop and speed control loop. The control process is: the speed control loop simulates the primary frequency modulation function, and its output is the input of the active power loop; the active power loop simulates the inertia and damping characteristics of the synchronous machine to calculate the frequency and phase of the reference voltage waveform; the reactive power control loop simulates A voltage regulation function to output the reference voltage amplitude; after generating the reference voltage, the first modulated wave in the dq coordinate system is obtained through the voltag...

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Abstract

With regard to the problem of frequency response and power allocation unreasonableness during the transient process caused by parameter design unreasonableness of a parallel running virtual synchronous power generator in a micro power grid, the invention proposes an inertia damping matching mechanism of a multi-machine parallel virtual synchronous power generator (VSG). The power allocation is controlled, and meanwhile, stable transient transition (relatively low oscillation amplitude and period) of power generators running in parallel and having different capacities is ensured. A PI regulator-based improved damping control method is creatively proposed. All VSGs can work with the same damping coefficient value under a modification method, so that calculation is reduced. In VSG parallel running, the selection of inertia and damping coefficient shall consider the dynamic characteristics of a system frequency and parallel power of the VSG, and the parameters are capacity functions of theVSG; and according to a matching principle, the steady-state and transient process can be optimized, so that stable support can be provided for a large amount of distributed power supplies connectedto the micro power grid and an intelligent power grid.

Description

technical field [0001] The invention belongs to the technical field of new energy power systems and microgrids, and in particular relates to a parameter configuration method for a microgrid virtual synchronous machine multi-machine parallel dynamic consistent response. Background technique [0002] With the increasing prominence of energy and environmental issues, renewable energy sources such as wind energy and solar energy have received more and more attention, while grid-connected inverters, as the interface between renewable energy power generation units and the grid, have almost no inertia and damping. , a large number of access will have a great impact on the stability of the system. In response to this problem, some scholars suggested that the swing equation of the synchronous machine should be incorporated into the inverter controller, and the concept of virtual synchronous generator (VSG) was proposed. By changing the control strategy of the inverter, it could simul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/382Y02P80/14
Inventor 颜湘武贾焦心张波王玲
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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