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Active electric network supporting load virtual synchronous device control method and system

A technology of virtual synchronization and device control, applied in the direction of reducing/preventing power oscillation, etc., can solve problems such as unstable operation and voltage oscillation, and achieve the effects of improving anti-disturbance ability, quick response, and quick support of the power grid

Pending Publication Date: 2019-04-23
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the virtual synchronous machine on the load side also has the problem of unstable operation, and there will be phenomena such as voltage oscillation

Method used

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  • Active electric network supporting load virtual synchronous device control method and system
  • Active electric network supporting load virtual synchronous device control method and system
  • Active electric network supporting load virtual synchronous device control method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The embodiment of the present invention provides a control method for a load virtual synchronization device that actively supports the power grid, and its implementation flow chart is as follows figure 1 shown, including:

[0066] S101: Bring the total amount of real-time disturbance of the system into the pre-established extended state observer of the load virtual synchronization device, perform calculations, and obtain an estimated value of system disturbance;

[0067] S102: Compensating the virtual torque by using the estimated system disturbance value as a compensation item of the virtual torque in active power control.

[0068] Specifically, in step S101, the total amount of real-time disturbance of the system is brought into the pre-established extended state observer of the load virtual synchronization device for calculation, and the estimated value of the system disturbance is obtained. The specific implementation process includes:

[0069] Step S101-1, based o...

Embodiment 2

[0120] This embodiment is aimed at figure 2 The three-phase voltage-type PWM rectifier topology shown is used to illustrate the implementation process of the invention. In the figure v a , v b , v c Respectively input the three-phase voltage on the power supply side, R s with L s are the equivalent line impedance, i a i b i c are three-phase input current respectively, Q 1 ~Q 6 is the switching tube, C is the DC side filter capacitor, R is the load, V DC is the output voltage of the DC side. Three-phase voltage-type PWM trimmers have been widely used due to the advantages of bidirectional power flow, unit power factor operation, low input current harmonic content, and controllable output voltage and power.

[0121] image 3 It is a block diagram of conventional active loop control. The given value of active power P set and actual value P e The difference is sent to the PI controller to generate virtual mechanical torque T m ,D p is the damping coefficient, an...

Embodiment 3

[0135] Based on the same inventive concept, the present invention also provides a load virtual synchronization device control system that actively supports the power grid, and the system includes: an expansion state observer module, a calculation module and a control module;

[0136] The extended state observer module is used to obtain the extended state observer expression of the load virtual synchronization device according to the mechanical motion equation of the load virtual synchronization device and the real-time amount of system disturbance;

[0137] The calculation module is configured to calculate and obtain an estimated value of system disturbance based on the extended state observer expression of the load virtual synchronization device;

[0138] The control module is used to use the system disturbance estimated value as a compensation item of the virtual torque in the active power control to compensate the virtual torque, and realize the control of the system voltage...

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PUM

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Abstract

The invention provides an active electric network supporting load virtual synchronous device control method, which comprises the following steps of bringing a system real-time perturbation total quantity into an expansion state observation device of a prebuilt load virtual synchronous device; performing calculation to obtain a system perturbation estimation value; using the system perturbation estimation value as a compensation item of a virtual torque in the active control to compensate the virtual torque. By using the technical scheme provided by the invention, the expansion state observation device is applied to the design of a control strategy; the observation is performed through the expansion state observation device; the observation value is used as the virtual torque for compensation; the perturbation resistance capability of the system is improved, so that the voltage and the power can be continuously and stably output.

Description

technical field [0001] The invention relates to the technical field of control of a load-side rectifier of a microgrid, in particular to a control method for a load virtual synchronization device actively supporting a power grid. Background technique [0002] Power electronic equipment is widely used in distribution network due to its control flexibility. However, due to the rapidity of power electronic equipment, its extensive application causes the lack of "inertia" of the distribution network, which reduces the stability of the distribution network operation. The technology of virtual synchronous machine has thus been proposed. [0003] Inspired by synchronous generators, the virtual synchronous machine technology applies the mechanical equations and electromagnetic equations of synchronous generators to the design of control strategies, enabling power electronic equipment to simulate the external characteristics of synchronous generators and injecting certain " inertia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 吴争刘海涛盛万兴吴鸣吕志鹏崔健龙禹季昆玉贾俊翁蓓蓓宋振浩赵婷
Owner CHINA ELECTRIC POWER RES INST
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