Virtual synchronous machine power decoupling method based on adaptive reactive power compensation
A virtual synchronous machine and power compensation technology, which is applied to AC network circuits, electrical components, circuit devices, etc., can solve the complex calculation of the decoupling method, the coupling model cannot accurately reflect the steady-state coupling value of reactive power, and affect the distributed power supply. Grid connection quality and system stability, etc., to achieve reliable control effect and achieve decoupling control effect
Inactive Publication Date: 2020-08-11
BEIJING JIAOTONG UNIV
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However, when the actual medium and low-voltage lines present resistance-inductive characteristics, there is a serious coupling between the active power and reactive power of the virtual synchronous machine grid, which in turn affects the grid-connected quality and system stability of distributed power generation.
[0003] The existing decoupling methods are roughly divided into three types, among which the objective function diagonalization decoupling control method cannot achieve good compatibility with the synchronous generator control existing in the system; using the coordinate transformation matrix to introduce the solution of virtual power or virtual voltage and virtual frequency The calculation of the coupling method is too complicated and not suitable for industrial applications; the coupling model built in the decoupling method of adaptive virtual impedance cannot accurately reflect the steady-state coupling value of reactive power caused by the change of active power
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[0050] Such as figure 1 As shown, the embodiment of the present invention provides a virtual synchronous machine power decoupling method based on adaptive reactive power compensation, including: calculating the compensation link C d (s), pass the d-axis current through the compensation link C d (s) Feedback to the virtual synchronous machine reactive power control loop.
[0051] The compensation link C d (s) is calculated according to the following formula (1):
[0052]
[0053]In formula (1), m is the compensation link parameter, K is the pressure regulation coefficient, D q is the reactive power-voltage droop coefficient, s is the pull-type transformation complex variable, L is the inductive component of the grid-connected total impedance Z, X is the inductive reactance corresponding to L, and R is the resistive component of the grid-connected total impedance Z, according to the following formula (2) Calculation:
[0054]
[0055] In formula (2), ω is the output a...
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The invention provides a virtual synchronous machine power decoupling method based on adaptive reactive power compensation, and belongs to the technical field of new energy grid-connected power generation and energy storage. The method comprises the steps that d-axis current is fed back to a reactive power control loop of the virtual synchronous machine after passing through a compensation link, and the compensation link Cd (s) automatically changes when an active power instruction changes so as to adapt to a new steady-state working point. According to the method, the compensation link is changed autonomously when the active power instruction is changed, reactive power steady-state coupling caused by the active power can be compensated effectively, and stable, accurate and reliable decoupling control of the active power and the reactive power of the virtual synchronous machine is realized.
Description
technical field [0001] The invention relates to the technical field of new energy grid-connected power generation and energy storage, in particular to a virtual synchronous machine power decoupling method based on adaptive reactive power compensation. Background technique [0002] With the development of new energy technologies, the penetration rate of distributed power in power systems continues to increase. The virtual synchronous machine technology, which can realize the "friendly" grid connection of distributed power sources such as wind and solar, has emerged as the times require and has become one of the research hotspots of high-proportion renewable energy. However, when the actual medium and low voltage lines present resistance-inductive characteristics, there is a serious coupling between the active power and reactive power of the virtual synchronous machine grid, which affects the grid-connected quality and system stability of distributed power generation. [0003...
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Login to View More IPC IPC(8): H02J3/38
CPCH02J3/38H02J3/381H02J2203/10
Inventor 吴学智姜静雅唐芬王玮刘京斗
Owner BEIJING JIAOTONG UNIV