Multi-VSG micro-grid frequency recovery control method with delay switch characteristic
A technology of frequency recovery and delay switching, which is applied in the direction of single-network parallel feeding arrangement, can solve problems such as differential control, and achieve the effects of strong scalability, guaranteed power supply quality, high reliability and stability
Active Publication Date: 2019-06-07
LIYANG RES INST OF SOUTHEAST UNIV +1
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Problems solved by technology
[0005] As the frequency support unit in the microgrid, the VSG should have the ability to control the primary and secondary frequency of the system in theory, but the conventional VSG control strategy only simulates the primary frequency control (PFC) of the synchronous motor, which is still inherently limited. poor control
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Embodiment 1
[0043] A multi-VSG microgrid frequency recovery control method with delay switching characteristics, such as figure 1 shown, including the following steps:
[0044] S1, adding an integral characteristic module in the active frequency control link of the virtual synchronous machine, improving the frequency characteristics of the virtual synchronous machine, and realizing frequency error-free control; figure 2 as shown, figure 2 It is a schematic diagram of a simulation calculation example of a real-time example of the present invention. The island microgrid includes two VSGs connected to the same AC bus, and each VSG uses this method for frequency control. The typical VSG active frequency control equation is composed of the droop equation and the rotor The equation of motion consists of:
[0045]
[0046] Among them, P m is the mechanical power of VSG, P e is the electromagnetic power, P 0 is the rated power, J is the moment of inertia, D is the damping coefficient, ω...
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The invention discloses a multi-VSG micro-grid frequency recovery control method with a time delay switch characteristic. The method comprises the steps: adding a module with an integral characteristic in an active frequency control link of a virtual synchronous machine, so as to improve the frequency characteristic of the virtual synchronous machine and implement the frequency indifference control; calculating the time required by primary and secondary frequency control of the virtual synchronous machine, and determining a delay time parameter according to the time; adjusting the inertia coefficient J of each VSG according to the dynamic change of the integral coefficient Ki in different time periods, thereby achieving the decoupling of primary and secondary frequency control of the micro-grid, and achieving the frequency recovery. The whole process of the method does not depend on communication, the steady-state frequency error of the micro-grid is eliminated on the premise that power sharing is guaranteed, and the stability of a micro-grid system is maintained.
Description
[0001] Field [0002] The invention relates to the field of frequency control of power system micro-grids, in particular to a multi-VSG micro-grid frequency recovery control method with delay switching characteristics. Background technique [0003] In recent years, the energy problem has become increasingly serious. In order to solve this crisis, new energy power generation technologies have been widely promoted and applied. As the main means of distributed energy consumption, micro-grid is a hot spot of recent research. Compared with traditional large power grid, micro-grid mainly uses static inverter components as power interface, the inertia and damping in the system are small, and the frequency stability is stable. Poor, in the island mode, it is easy to be disturbed by the outside world and cannot run stably, and the virtual synchronous generator (VSG) technology provides a new idea for solving the above problems. [0004] The VSG control strategy is mainly used in the d...
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IPC IPC(8): H02J3/38H02J3/46
Inventor 顾伟洪灏灏顾晨骁楼冠男曹戈
Owner LIYANG RES INST OF SOUTHEAST UNIV