<p>Aiming at the uneven power distribution and system stability problems in the parallel operation of virtual synchronous generators with multiple machines, this paper proposes a new energy-based power equalization strategy. The study first investigates power state of virtual synchronous generators, then connects one in parallel with multiple machines, introduces the secondary control voltage and frequency recovery for parallel operation power equalization, and uses the constructed dynamic virtual impedance control strategy to achieve the purpose of multiple parallel power equalization. Results show that under active power, the voltage power after introducing dynamic virtual impedance is 1.08kw, 2.09kw and 3.05kw, respectively, and the voltage ratio of three virtual synchronous generators is roughly 1:2:3. Under the condition of reactive power, the reactive power after introducing dynamic virtual impedance is 0.73kw, 1.49kw, and 2.21 kw, the voltage ratio of the same three virtual synchronous generators is roughly 1:2:3. This demonstrates that the proposed multimachine parallel power equalization control strategy can effectively reduce the system frequency and voltage oscillations and achieve the goal of power equalization. In addition, the validation in a standard test system further proves the applicability and effectiveness of the strategy in complex grid environments, and provides new ideas and methods for the parallel power equalization strategy of new energy generation systems.</p>

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Virtual Synchronous Generator Multi-Machine Parallel Power Equalization Strategy Based on New Energy Sources

  • Xiaoyu Zhang

摘要

Aiming at the uneven power distribution and system stability problems in the parallel operation of virtual synchronous generators with multiple machines, this paper proposes a new energy-based power equalization strategy. The study first investigates power state of virtual synchronous generators, then connects one in parallel with multiple machines, introduces the secondary control voltage and frequency recovery for parallel operation power equalization, and uses the constructed dynamic virtual impedance control strategy to achieve the purpose of multiple parallel power equalization. Results show that under active power, the voltage power after introducing dynamic virtual impedance is 1.08kw, 2.09kw and 3.05kw, respectively, and the voltage ratio of three virtual synchronous generators is roughly 1:2:3. Under the condition of reactive power, the reactive power after introducing dynamic virtual impedance is 0.73kw, 1.49kw, and 2.21 kw, the voltage ratio of the same three virtual synchronous generators is roughly 1:2:3. This demonstrates that the proposed multimachine parallel power equalization control strategy can effectively reduce the system frequency and voltage oscillations and achieve the goal of power equalization. In addition, the validation in a standard test system further proves the applicability and effectiveness of the strategy in complex grid environments, and provides new ideas and methods for the parallel power equalization strategy of new energy generation systems.