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Improved virtual synchronous generator model prediction control method and system

A generator model and virtual synchronization technology, applied in motor generator control, control system, vector control system, etc., can solve the problems of high control method complexity, high hardware cost, low safety, etc., to improve tracking accuracy, The effect of reducing the number of uses and reducing hardware costs

Active Publication Date: 2021-07-27
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0005] The purpose of the present invention is how to design an improved virtual synchronous generator model predictive control method and system to solve the problems of traditional virtual synchronous generator and model predictive control methods with high complexity, low precision, low security and high hardware cost question

Method used

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  • Improved virtual synchronous generator model prediction control method and system
  • Improved virtual synchronous generator model prediction control method and system
  • Improved virtual synchronous generator model prediction control method and system

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Embodiment 1

[0136] Such as figure 1 As shown, an improved virtual synchronous generator model predictive control method, including the following steps:

[0137] S1. Establish a state space model of a three-phase off-grid inverter based on LC filtering, and predict the capacitor voltage at the next moment based on the current inductor current, capacitor voltage, load current and inverter voltage vector, combined with the state space model ;

[0138] S2. Design a current observer to observe the inductor current and reduce the use of current sensors;

[0139] S3. Select the best switching state in the form of a multi-objective value function and add an overcurrent limit protection item to protect the inverter from being damaged by overcurrent when the external load is switched;

[0140] S4. The virtual synchronous generator control method is used to provide the output reference voltage for the model predictive control, which provides inertia and damping for the system.

[0141] figure 2...

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Abstract

The invention discloses an improved virtual synchronous generator model prediction control method and system, belongs to the technical field of energy storage inverter control, and solves the problems of high complexity, low precision, low safety and high hardware cost of a traditional virtual synchronous generator and model prediction control mode. The virtual synchronous generator is used for providing reference voltage for a value function in model prediction control, the capacitor voltage and the inductive current are controlled in a multi-control-target mode for the value function in the model prediction control, the tracking precision is improved, and overcurrent limitation is added. It is ensured that the impact current of the inverter can be in a safe range during load switching, a current observer is adopted to observe the inductive current value, the number of used current sensors is reduced, and the hardware cost is reduced; compared with a traditional virtual synchronous generator and model prediction control, the advantages of the two are combined, inertia and damping are provided for the system, the control structure is simplified, the control mode is more flexible, and parameter design is simpler.

Description

technical field [0001] The invention belongs to the technical field of energy storage inverter control, and relates to an improved virtual synchronous generator model predictive control method and system. Background technique [0002] With the widespread application of distributed energy resources, three-phase inverters play an increasingly important role, which are usually used together with LC filters to provide sinusoidal voltages with low harmonic distortion. The LC filter makes the control structure design and parameter adjustment of the system more complicated. [0003] In this context, some control methods have been adopted for three-phase inverter control, such as droop control, deadbeat control, V-f control, and P-Q control. However, these control methods often lack inertia and damping so that it is difficult to handle complex load conditions. To compensate inertia and damping, a virtual synchronous generator (VSG) control strategy is proposed. But these control ...

Claims

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Application Information

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IPC IPC(8): H02P9/10H02P21/13H02P21/14H02P21/22H02M7/537H02M1/088H02M1/32
CPCH02P9/102H02P21/13H02P21/14H02P21/22H02M7/537H02M1/088H02M1/32
Inventor 丁力刘钊陆一言杨家庆
Owner NANJING UNIV OF SCI & TECH
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