Virtual capacitance control method applied to direct-current power distribution network converter station
A technology of DC distribution network and virtual capacitor, applied in the direction of DC network circuit device, power transmission AC network, electrical components, etc., can solve the problem of late development of DC distribution network, frequent load fluctuation of DC distribution network, and immature control technology. and other problems, to achieve the effect of stabilizing power distribution performance, improving dynamic regulation performance, and ensuring DC voltage
Active Publication Date: 2021-04-02
SOUTHEAST UNIV +2
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Problems solved by technology
Although the DC distribution network provides a broader prospect for new technologies and smart grids, due to the relatively late development of the DC distribution network, its control technology is not yet mature enough, and most of the control technologies now refer to multi-terminal flexible DC transmission and low-voltage Some control methods in the DC microgrid, among which the voltage coordination control methods suitable for the DC distribution network mainly include three types: master-slave control, voltage margin control and droop control, but because the load fluctuation of the DC distribution network is more frequent, it contains A large number of distributed energy sources, the power flow is more flexible, these three types of traditional control methods cannot have good steady-state performance and dynamic performance at the same time
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Embodiment 1
[0037] by image 3 The example shown is the structure of the double-ended ring DC distribution network, the contact switches S1 and S2 are closed, the system is in the double-ended ring operation mode, i=2, VSC1 is set as the master station to work in the constant voltage control mode, and VSC2 is set to In order to use the controller designed by the present invention from the converter station, the virtual capacitor controller design specifically includes the following steps:
[0038] The first step is to calculate the equivalent value C of the DC side capacitance of the converter station according to the number of sub-modules of the bridge arm of the converter station and the capacitance value of the sub-modules dc , in order to offset the DC side voltage fluctuation caused by the power imbalance of the equivalent capacitor, design a virtual capacitor C vir In parallel with the equivalent capacitance, and let the virtual capacitance value C vir =C dc .
[0039] The secon...
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The invention discloses a virtual capacitance control method applied to a direct-current power distribution network converter station. The method comprises the steps of designing a product differencevoltage regulation equation based on instantaneous power based on a power and energy balance principle during charging and discharging of a capacitor, and calculating active power required to be provided for maintaining stability of the direct-current voltage of a direct-current side of a converter station in real time; the proposed control method is applied to a slave converter station of a direct-current power distribution network adopting master-slave control, and when the system is in a steady state, the power distribution precision of the system in steady-state operation can be ensured; when the direct-current power distribution network suffers from large disturbance and operation mode switching occurs, the virtual capacitor can rapidly provide inertia support for the direct-current power distribution network, the direct-current voltage dynamic adjustment performance is improved, and the stability of the direct-current voltage of the direct-current power distribution system is ensured.
Description
technical field [0001] The invention belongs to the technical field of direct current distribution network control, and relates to a virtual capacitor control method of a converter station in a direct current distribution network. Background technique [0002] Compared with the AC distribution network, the DC power distribution system can realize closed-loop operation, has a variety of power supply methods, and the flow is flexible and controllable, which is more conducive to the integration and consumption of renewable energy such as wind power and solar power. Although the DC distribution network provides a broader prospect for new technologies and smart grids, due to the relatively late development of the DC distribution network, its control technology is not yet mature enough, and most of the control technologies now refer to multi-terminal flexible DC transmission and low-voltage Some control methods in the DC microgrid, among which the voltage coordination control meth...
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IPC IPC(8): H02J1/00H02J3/36
CPCH02J1/00H02J3/36Y02E60/60
Inventor 吴在军谢兴峰司鑫尧杨景刚肖小龙杨媛平曹骁勇刘洋刘瑞煌
Owner SOUTHEAST UNIV