Simulation control method and system for performing PQ decoupling on virtual synchronizer
A virtual synchronous machine, decoupling technology, applied in the direction of single-network parallel feeding arrangement, AC network circuit, circuit device, etc.
Inactive Publication Date: 2018-08-24
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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[0010] The present invention provides a simulation control method and system for performing PQ decoupling on a virtual synchronous machine, so as to solve the problem of how to realize the simulation control of PQ decoupling on a virtual synchronous machine
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[0046] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings are not limiting of the present invention. In the figures, the same units / elements are given the same reference numerals.
[0047] Unless otherwise stated, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that the terms defined by commonly used dictionaries should be understood as having consistent meanings in the context of their related fields, and should not be understood as idealiz...
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The invention discloses a simulation control method for performing PQ decoupling on a virtual synchronizer. The simulation control method is characterized by introducing virtual impedance to an outputcircuit of an inverter for remodeling the output impedance of the inverter to realize active and reactive decoupling, and specially comprises the steps of enabling the virtual synchronizer to controla three-phase sine wave generator to determine a reference voltage, and to calculate voltage drop on the virtual impedance; calculating a difference value between the reference voltage and the voltage drop on the virtual impedance, and enabling a dual-loop control circuit to control the outlet voltage of an LC filter to track the difference value to add the virtual impedance to the virtual synchronizer, wherein the output impedance on the circuit is purely inductive after virtual impedance is introduced, and the virtual impedance is introduced for remodeling the output impedance of the inverter to realize active and reactive decoupling. Through the virtual impedance, the output impedance of the inverter is remolded, and by virtue of control improvement, the coupling problem between activeand reactive power is solved.
Description
technical field [0001] The present invention relates to the technical field of electric power control, and more specifically, relates to a simulation control method and system for performing PQ decoupling on a virtual synchronous machine. Background technique [0002] In power systems, power transmission such as figure 1 shown. Among them, z=jx, and under normal circumstances, the power angle difference is very small, that is, θ≈0, cosθ≈1, and the expression of active and reactive power at this time is as follows: [0003] [0004] [0005] It can be seen from the above formula that adjusting the voltage phase angle can realize the control of active power, and adjusting the voltage difference can realize the control of reactive power. However, the voltage level of the microgrid is generally low, and the impedance of the line is generally not purely inductive, that is, z=r+jx. [0006] At this time, the mathematical expression of active and reactive power is as follo...
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Login to View More IPC IPC(8): H02J3/40H02J3/48H02J3/50
CPCH02J3/40H02J3/48H02J3/50H02J2203/20
Inventor 唐酿盛超陈晓科黄辉黄明欣陈迅赵兵
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID