A Control Method of Virtual Synchronous Generator Based on Phase Feedforward
A generator control and virtual synchronization technology, applied in the direction of reducing/preventing power oscillation, single-grid parallel feeding arrangement, etc., can solve the problem of reducing the steady-state error of the system response speed, and achieve strong power oscillation suppression ability and fast dynamic response. , the effect of free selection
Active Publication Date: 2020-03-17
XI AN JIAOTONG UNIV
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[0005] The purpose of the present invention is to provide a virtual synchronous generator control method based on phase feedforward for the defects that the suppressed power of the existing virtual synchronous motor technology will reduce the system response speed and affect the droop control and cause steady-state errors
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[0051] From the step response of active power under different coefficients and the corresponding two aspects of active power when the grid frequency fluctuates, the phase feedforward virtual synchronous generator control proposed by the present invention is compared with the traditional damped virtual synchronous generator control effect.
[0052] The traditional damping virtual synchronous generator control effect is as follows: Figure 5 and Figure 6 as shown, Figure 5 and Figure 6 The simulation and experimental power response waveforms are respectively. Figure 5 Among them, the active power command is 500W at the beginning, the grid frequency is 50Hz, the active power command steps up to 1000W at t=3s, and the grid frequency rises to 50.05Hz at t=6s. Figure 6 In the above, the active power command is 500W at the beginning, the grid frequency is 50Hz, the active power command steps up to 1000W at t=2s, and the grid frequency rises to 50.05Hz at t=9s.
[0053] The c...
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The invention discloses a phase feedforward-based virtual synchronous generator control method. The control method comprises the following steps of 1) performing feedforward quantity calculation, subtracting power grid rated frequency <omega><ref> from the output frequency <omega> of the virtual synchronous generator to obtain the frequency difference <delta> <omega> between the two parts, and multiplying the <delta> <omega> with a feedforward coincident k<omega> to obtain the compensation quantity <theta><c>; 2) a droop control part, obtaining simulation mechanical power P<m> of the virtual synchronous generator through calculation according to an output active power reference instruction P<ref> of the virtual synchronous generator and the frequency difference <delta> <omega>; 3) performing simulation on a rotor mechanical equation, and obtaining output frequency <omega> according to the P<m> and the actual output active power P<e>; 4) performing integration on the output frequency <omega> and then adding with the phase feedforward control compensation quantity <theta><c> to obtain the output phase <theta> of the virtual synchronous generator; and 5) taking the phase <theta> obtained in the step 4) as a dp coordinate conversion phase, performing dp coordinate conversion on a dp coordinate voltage instruction value v<*>dp obtained by a reactive ring to obtain a three-phase voltage modulation signal v<*>abc in an abc coordinate, and enabling the modulation signal to be processed by a PWM modulator to obtain a control signal of a switch network for further driving the switchnetwork.
Description
technical field [0001] The invention belongs to the field of virtual synchronous motor control in power electronic technology, and in particular relates to a virtual synchronous generator control method based on phase feedforward. Background technique [0002] Renewable new energy power generation mainly based on wind power and photovoltaics mainly uses power electronic converters as grid-connected interfaces, which have the advantages of flexible control and quick response, but also have shortcomings such as lack of inertia and damping, especially at present Current converters are often connected to the grid in current source mode, which is significantly different from the synchronous generators used in traditional energy sources in terms of external characteristics. Now, with the continuous improvement of the penetration rate of distributed renewable energy, the rotating reserve capacity and moment of inertia in the power system are relatively reduced, which increases the ...
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IPC IPC(8): H02J3/44H02J3/46H02J3/24
Inventor 王跃李明烜周晖赵发明张海龙王林
Owner XI AN JIAOTONG UNIV