A virtual inertial control method for distributed generation system

A technology of distributed power generation and virtual inertia, which is applied in the field of power system control, can solve the problems that the distributed power generation system cannot play its role, the frequency cannot return to the rated value, and does not have adjustable inertia, so as to improve the stability of grid connection , Improve the effect of inertia and stability

Active Publication Date: 2021-05-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Then in this case the power adjustment of the VSG will not have adjustable inertia
In addition, since the frequency control of the VSG only simulates a frequency modulation of the synchronous generator, its frequency cannot return to the rated value after the external load changes, and there is a static frequency difference
Therefore, although the VSG has a good control effect under grid-connected conditions, it cannot play a role in the independent operation of the distributed generation system.

Method used

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  • A virtual inertial control method for distributed generation system
  • A virtual inertial control method for distributed generation system
  • A virtual inertial control method for distributed generation system

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Embodiment

[0035] figure 1 It is a principle diagram of a virtual inertia control method for a distributed power generation system of the present invention.

[0036] In this example, if figure 1 As shown, a virtual inertia control method of a distributed power generation system of the present invention comprises the following steps:

[0037] S1. Collect inverter output voltage amplitude and voltage frequency

[0038] S1.1. Collect the inverter output voltage V o , and calculate the amplitude V of the output voltage by the amplitude detection method omag ;

[0039] S1.2, according to the inverter output voltage V o , use the phase-locked loop PLL to track the inverter output voltage, so as to collect the inverter output voltage frequency f o ;

[0040] S2, speed control

[0041] Because the droop control in the traditional VSG method is controlled according to the external characteristics of the generator, firstly, the deficiencies of the droop control can be described with refere...

example

[0080] In this instance, given the figure 2 The simulation system shown, the specific parameters are shown in Table 1, the inverter output is filtered by LC to supply power to the load, and the PLL circuit detects the filtered voltage to obtain the inverter output voltage amplitude and frequency. Feedback voltage and current are calculated to obtain active and reactive power output by the inverter. The frequency and its set value are fed back into the speed controller to obtain the voltage angular frequency reference value, and the voltage amplitude and its set value are fed back into the excitation controller to obtain the inverter voltage reference value. Synthesize the output of the speed controller and the excitation controller as the reference signal of the inverter voltage, and control the on-off of the inverter bridge through PWM modulation.

[0081] Table 1 is a system simulation model parameter table in the present embodiment;

[0082]

[0083]

[0084] Table...

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Abstract

The invention discloses a virtual inertia control method of a distributed power generation system, which abandons the droop control in the traditional virtual synchronous power generation technology, and instead introduces inertia and integral links, and simulates a generator according to the feedback output of the inverter. The second-order model is used to adjust the output; this can effectively improve the inertia of the distributed energy, thereby increasing the rotation capacity of the microgrid, solving the problem that new energy and traditional power generation equipment cannot keep pace, and improving the transient stability of the system.

Description

technical field [0001] The invention belongs to the technical field of electric power system control, and more specifically relates to a virtual inertia control method of a distributed power generation system. Background technique [0002] With the increasing penetration of distributed energy in the grid, inverters are widely used as the interface between distributed energy and the grid. However, since the inverter is composed of power electronic equipment, it responds quickly to grid dispatch or disturbance, and cannot keep pace with traditional generators in the grid, which can easily cause grid fluctuations and malfunctions in safety control. To solve this problem, virtual synchronous generator VSG (Virtual synchronous generator) technology was proposed, a large number of studies have shown that it can make the inverter simulate the operation of a synchronous generator. The VSG strategy mainly includes two parts: droop control and inertial simulation. Among them, the dr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/24H02J3/46
CPCH02J3/24H02J3/381H02J3/46H02J2203/20
Inventor 易建波黄琦井实董彬彬张国洲
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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