| 引用本文: | 龙军,郑宇琦,卢泉,周子富.基于Z源电力弹簧和简化情感控制的微电网电压和频率控制方法[J].电力自动化设备,2020,40(4): |
| LONG Jun,ZHENG Yuqi,LU Quan,ZHOU Zifu.Voltage and frequency control method of microgrid based on Z-source ES and simplified BELBIC[J].Electric Power Automation Equipment,2020,40(4): |
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| 摘要: |
| 为了减小可再生能源出力间歇性引起的电压和频率波动，提出了一种基于简化情感控制、使用Z源电力弹簧(ES)的微电网电压和频率稳定方法。针对ES逆变控制死区时间引起的输出波形畸变、谐波含量增加等问题，设计了一种带Z源网络的ES拓扑结构，利用Z源逆变器允许桥臂瞬时短路的特性，消除了驱动信号的死区时间，降低了ES输出电压的谐波含量；通过分析情感控制的自学习过程，对情感控制模型进行简化，去除了眶额皮质结构并隐藏了奖励信号，在保证良好控制效果的同时，减少了需整定的参数；设计了基于简化情感控制的ES控制器，简化情感控制器根据关键负载电压及系统频率偏差对ES的幅值及相位进行调节，实现了用1个ES同时进行电压和频率控制。系统仿真与实验结果表明，所提方法有较高的控制精度，设计的ES输出电压谐波含量较低，能有效稳定微电网的电压和频率波动。 |
| 关键词: 微电网 电压控制 频率控制 电力弹簧 Z源网络 简化情感控制 |
| DOI：10.16081/j.epae.202003019 |
| 分类号:TM761 |
| 基金项目:国家自然科学基金资助项目(51567002) |
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| Voltage and frequency control method of microgrid based on Z-source ES and simplified BELBIC |
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LONG Jun, ZHENG Yuqi, LU Quan, ZHOU Zifu
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College of Electrical Engineering, Guangxi University, Nanning 530004, China
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| Abstract: |
| In order to reduce the voltage and frequency fluctuation caused by the intermittent output of renewable energy, a voltage and frequency stabilization method of microgrid based on simplified BELBIC(Brain Emotional Learning Based Intelligent Controller) and Z-source ES(Electric Spring) is proposed. Aiming at the output waveform distortion and increase of harmonic content caused by the dead zone time of ES inverter control, an ES topology structure with Z-source network is designed. By taking advantage of the characteristics of Z-source inverter that allows instantaneous short circuit of bridge arm, the dead zone time of driving signal is eliminated and the harmonic content of ES output voltage is reduced. By analyzing the self-learning process of BELBIC, the model of BELBIC is simplified to remove the structure of the orbitofrontal cortex and hide the reward signal, so as to reduce the parameters needed to be adjusted while ensuring a good control effect. The ES controller based on simplified BELBIC is designed. The simplified BELBIC adjusts the amplitude and phase of ES according to the deviation of critical-load voltage and system frequency, realizing the simultaneous voltage and frequency control with one ES. Simulative and experimental results show that the proposed method has high control accuracy and low ES output voltage harmonic content, and can effectively stabilize the voltage and frequency fluctuation of microgrid. |
| Key words: microgrid voltage control frequency control electric spring Z-source network simplified BELBIC |
