适用于孤岛运行的永磁同步电机自动功率平衡控制策略研究

doi:10.19595/j.cnki.1000-6753.tces.221348

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Abstract Recently, the permanent magnet synchronous generator-based wind turbine (PMSG-based WT) have gained significant popularity in wind power applications. With the development of microgrids, the PMSG-based WTs are required to be operated in the stand-alone operation mode in some scenarios. The previous studies in stand-alone microgrids mainly focus on the phase-locked loop (PLL)-based controls for WT, which still require the external grid-forming power supplies. The recent studies for the stand-alone operation of PLL-free WTs were relatively complicated and difficult to adjust the parameters. They did not adequately discuss the coordination of grid side converter (GSC) and rotor side converter (RSC) of WT, nor did they consider the demand response in stand-alone operation mode (SAOM). To bridge these gaps, this paper proposed two advanced autonomous power balance control schemes for PMSG-based WT in SAOM.
In the first strategy, the GSC of WT controls the converter voltage as an ideal voltage source with the fixed modulation index and frequency, while the RSC of WT modifies the active power reference by controlling DC-link voltage through one PI controller. The main drawbacks of the first strategy are that the load demand response is not taken into consideration and it may not ensure the power synchronism of multi-WT in SAOM. Therefore, in the second strategy, the GSC of WT achieves grid-synchronization and inertia response utilizing the dynamic of DC-link voltage, while the RSC adjusts active power based on the DC-link voltage deviations to mimic the primary frequency control. Both proposed strategies can effectively ensure the independent operation of WT without PLL and external power supplies. Compared with the typical virtual synchronous generator (VSG) controls and other SAOM controls, the complexity of the proposed strategies is more reduced, and the control parameters are easy to tune, as they only require the measurement of DC-link voltage. Particularly, Strategy Ⅱ stands out by the energy-efficient property by using the reserved energy in DC capacitor for system inertia support and the load demand response to decrease the risks of WT tripping off. In order to improve the voltage profile of the second proposed scheme, an improved GSC control of WT via one simple PI controller for sustaining the point of common coupling (PCC) voltage during system disturbance is further proposed. Nonlinear simulations of one PMSG connected with several local loads considering various power system contingencies have been studied to verify the effectiveness of two proposed strategies.
The following conclusions can be drawn from the simulation analysis: (1) Both strategies can effectively ensure the stable operation of PMSG-based WT in tested stand-alone system. (2) Strategy Ⅰ can well stabilize the grid frequency and the DC-link voltage. But it requires high operation costs of WT and is not energy-saving in SAOM. (3) Strategy Ⅱ makes the alternation of DC-link voltage proportional to the grid frequency, which reduces the power balance burden of stand-alone WT by temporally absorbing or releasing the energy from DC capacitor during load changes. More importantly, Strategy Ⅱ stands out by fully utilizing the load demand response for fast power balance and decreasing the risk of WT tripping, which is more energy-efficient and is suitable for multi-WTs operation in SAOM.

Key words： Permanent magnet synchronous generator (PMSG) stand-alone operation autonomous power balance control inertia response primary frequency control energy-efficient property

Received: 13 July 2022

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TM711

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	Articles by authors
	Lu Qiuyu¹
	Dai Yaohui²
	Yang Yinguo¹
	Han Jinlong²
	Liao Peng¹

Cite this article:

Lu Qiuyu¹,Dai Yaohui²,Yang Yinguo¹等. Novel Autonomous Power Balance Control for PMSG Based Wind Turbine in Stand Alone Operation[J]. Transactions of China Electrotechnical Society, 2023, 38(22): 6150-6164.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.221348 OR https://dgjsxb.ces-transaction.com/EN/Y2023/V38/I22/6150

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