A self-storage multi-terminal flexible straight system control method and system
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A control method and self-storage technology, applied in power transmission AC networks, circuit devices, AC network circuits, etc., can solve problems such as controller input saturation, and achieve good robustness and dynamic responsiveness.
Active Publication Date: 2021-05-11
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +4
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The DC voltage control introduces a constraint command filter to solve the differential expansion problem of the reverse push control, and designs a filter compensation signal to solve the problem of the error of the filter itself and the saturation of the controller input
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Embodiment 1
[0067] In the embodiment of the present invention, the self-storage multi-terminal back-to-back flexible straight system is taken as an example to describe the control method of the present invention.
[0068] Step 1. Establish a nonlinear mathematical model of self-energy storage based multiport back-to-back VSC-HVDC, SES-MBTB
[0069] The self-storage multi-terminal back-to-back flexible straight system in the prior art has three connection modes: series, parallel, and hybrid. The self-storage multi-terminal back-to-back flexible straight system proposed in the embodiment of the present invention adopts a parallel connection mode, omitting the DC link. The energy storage device is equipped with a DC / DC converter, and the DC / DC converter is shared with the DC side of all voltage source converters, which is conducive to the stability of the DC side voltage of the flexible DC system, and the control is simple and flexible. Easy to expand, the topology of the five-port SES-MBTB ...
Embodiment 2
[0162] In order to verify the feasibility and effectiveness of the proposed control algorithm of the present invention, based on Matlab / Simulink set up such as figure 1 The five-terminal SES-MBTB system simulation model shown.
[0163] The parameter settings of the simulation model are shown in Table 1:
[0164] Table 1 Simulation parameters
[0165]
[0166] Table 2 shows the active power changes of VSC1, VSC2, VSC3, and VSC4 in different time periods, respectively performing simulations under the traditional PID control algorithm and the projection adaptive command filtering back-calculation (PACBC) algorithm of the present invention, and comparing the simulation results.
[0167] Table 2 Simulation conditions
[0168]
[0169] like Image 6 Shown is the comparison chart of PID control and PACBC effect, Image 6 (a)(c)(e) are the effect diagrams of PID control of active power, DC bus voltage and AC side current harmonic distortion (THD) of each converter station, ...
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Abstract
The invention discloses a control method and system for a self-storage multi-terminal flexible straight system. The system controller is designed by using the reverse push method to realize the stability of the DC voltage and the rapid independent control of the active and reactive power. At the same time, a constraint command filter is introduced to solve the problem. The differential expansion and control saturation problems of reverse push control, and design compensation signals to solve the error problem of the filter, introduce adaptive control to ensure the robustness of the system to uncertain parameters, and use projection operators to optimize adaptive uncertain parameters , the control law of the system is designed based on the Lyapunov stability theory, which improves the anti-interference ability of the system and realizes the asymptotic stability of the whole system. Finally, a simulation model was built in the simulation software, and compared with the traditional PID control algorithm and the command filtering back-calculation algorithm, the simulation results show that the control method of the present invention has better robustness and dynamic response performance, and is a self-storage multi-terminal flexible The control algorithm of the straight system provides theoretical basis and technical support.
Description
technical field [0001] The invention belongs to the technical field of flexible direct current transmission control, and in particular relates to a control method and system for a self-storage multi-terminal flexible direct current system. Background technique [0002] In recent years, with the sustained and rapid economic and social development, the structure of power grids at all levels has been significantly strengthened. Subsequently, high-reliability power supply and high-penetration distributed energy friendly access put forward higher requirements for power transmission technology of distribution network. Back-to-back flexible DC (Back-to-Back VSC-HVDC) is the latest development of grid flexible control technology. Decoupling and interconnection to achieve long-term safe closed-loop operation of any feeder, greatly improving the reliability of power grid power supply; PQ four-quadrant control, can precisely regulate the power flow distribution of the grid, and improv...
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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 吕振华葛乐韩华春李强褚国伟许建明
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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