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Virtual synchronous machine control system and method based on hybrid energy storage module

A virtual synchronous machine and hybrid energy storage technology, which is applied in the direction of AC network voltage adjustment, reduction/prevention of power oscillation, reactive power compensation, etc., can solve problems such as low energy density and low power density

Inactive Publication Date: 2019-06-21
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The battery system has a high energy density and can provide energy for a long time, but its power density is low; while the super capacitor has a high power density and can provide power buffer for other energy storage devices, but its disadvantage is that the energy density is low , the combination of the two forms of energy storage can complement each other and improve the practicability of the system

Method used

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  • Virtual synchronous machine control system and method based on hybrid energy storage module
  • Virtual synchronous machine control system and method based on hybrid energy storage module
  • Virtual synchronous machine control system and method based on hybrid energy storage module

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] like figure 1 The hybrid energy storage module-based virtual synchronous generator and its control system include: hybrid energy storage module, virtual synchronous generator, load, distributed power supply, VSG control module, hybrid energy storage module power distribution control module;

[0072] Wherein, the hybrid energy storage module is located on the DC side of the virtual synchronous generator, which includes a storage battery and a supercapacitor, the storage battery is connected to the supercapacitor through a bidirectional DC / DC converter, and the two together provide the required energy for the virtual synchronous generator energy; the output end of the virtual synchronous machine is connected to the load through the LC filter circuit; the output end of the distributed power supply is also connected to the load, that is, the virtual synchronous generator and the distributed power supply jointly supply power to the load.

[0073] An embodiment of the present...

Embodiment 2

[0117] An embodiment of the present invention provides a virtual synchronous machine control method based on a hybrid energy storage module, such as Figure 2-4 shown, including:

[0118] Use VSG active frequency control sub-module to generate voltage deviation reference value Δu dcref and the phase angle of the output voltage The voltage deviation reference value Δu dcref Calculated by the following formula:

[0119] Δu dcref = K vdc (ω-ω 0 ) (1)

[0120] Among them, K vdc is the DC side voltage adjustment coefficient of the virtual synchronous generator, ω is the rotational angular velocity corresponding to the virtual rotor of the virtual synchronous generator; ω 0 =2πf 0 is the rated moment of inertia, f 0 is the rated frequency;

[0121] The phase angle of the output voltage The calculation process is:

[0122] First, the mechanical equation of rotor motion of the virtual synchronous motor is obtained, and the mechanical equation of rotor motion of the virt...

Embodiment 3

[0140] Use as attached figure 1 As shown in the topology, the corresponding simulation model is built in Matlab / Simulink, and the analysis is carried out for the three situations of constant load, step load and random fluctuation load. The specific parameters in the simulation are shown in the table below.

[0141]

[0142] Condition 1: Constant load

[0143] When the load is constant at 7.4kW, the output voltage U after VSG AC side filtering g and current I g as attached Figure 5 And attached Image 6 It can be seen from the attached figure that the amplitude of the three-phase output voltage is stable to about 311V, and the amplitude of the output three-phase current is stable to about 18A. It can be seen that under constant load conditions, the control strategy proposed in this paper can ensure a good output waveform and stable output power.

[0144] Working condition 2: step load

[0145] At the moment of 3s, the AC side load of the system has an active power st...

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Abstract

The invention discloses a virtual synchronous machine control system and method based on a hybrid energy storage module. The virtual synchronous machine control system comprises a VSG control module and a hybrid energy storage module power distribution control module. The VSG control module comprises a VSG active frequency control sub-module, a VSG reactive voltage control sub-module and a VSG inner loop control sub-module; the VSG active frequency control sub-module is used for generating a voltage deviation reference value [delta]u<dcref> and a phase angle [psi] of an output voltage, and theVSG reactive voltage control sub-module is used for generating an output voltage reference value amplitude E; the VSG inner loop control sub-module is used for receiving the phase angle [psi] of theoutput voltage and the output voltage reference value amplitude E, and generating six paths of PWM waves for controlling the virtual synchronous machine based on a network side voltage; and the hybridenergy storage module power distribution control module is used for receiving the voltage deviation reference value [delta]u<dcref> output by the VSG active frequency control sub-module and outputting PWM control signals used for controlling two IGBT switch tubes of a DC-side bidirectional DC / DC converter. The service life of the energy storage module can be greatly prolonged, and meanwhile the working efficiency of the VSG system is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of new energy power generation and micro-grid, and specifically relates to a virtual synchronous machine control system and method based on a hybrid energy storage module. Background technique [0002] As the utilization rate of renewable energy continues to rise and the penetration rate of distributed power continues to increase, the stability of traditional power grids is potentially threatened. In the traditional power system, because the inertia and damping of the physical system of the synchronous generator can suppress the frequency fluctuation and voltage fluctuation of the system, the stability of the system is better. Especially when the frequency of the power grid fluctuates, the rotor of the synchronous generator has natural inertia, and the frequency fluctuation is stabilized by releasing and absorbing energy through the rotor. With the development of power electronics technology, distributed ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/16
CPCY02E40/30
Inventor 张宸宇史明明袁晓冬
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST