直流微電網(wǎng)虛擬慣性控制及其穩(wěn)定性分析
發(fā)布時(shí)間:2018-12-14 12:20
【摘要】:針對直流微電網(wǎng)慣性低,母線電壓抗干擾能力差的問題,考慮直流微電網(wǎng)中各旋轉(zhuǎn)設(shè)備和儲能設(shè)備的潛在慣性支持能力,提出直流微電網(wǎng)虛擬慣性控制。首先,給出了直流微電網(wǎng)中各可控電源提供的慣性功率的通用的表達(dá)式,該慣性功率直接由直流母線電壓變化量及虛擬慣性控制系數(shù)確定;其次,在設(shè)計(jì)各變流器附加慣性控制時(shí),采用一階慣性環(huán)節(jié)代替了微分環(huán)節(jié),避免了對輸入信號產(chǎn)生高頻干擾;再次,建立了直流微電網(wǎng)的小信號模型,分析了加入虛擬慣性控制后直流微電網(wǎng)的穩(wěn)定性,給出了虛擬慣性控制系數(shù)的選取范圍;最后,在Matlab/Simulink中建立了直流微電網(wǎng)模型并進(jìn)行了時(shí)域仿真,驗(yàn)證了所提控制策略的有效性以及穩(wěn)定性分析的正確性。
[Abstract]:Considering the potential inertial support ability of each rotating equipment and energy storage equipment in DC microgrid, the virtual inertial control of DC microgrid is proposed in view of the low inertia of DC microgrid and poor anti-interference ability of bus voltage. Firstly, the general expression of inertia power provided by controlled power supply in DC microgrid is given. The inertia power is directly determined by DC bus voltage variation and virtual inertia control coefficient. Secondly, in the design of the additional inertial control of each converter, the first-order inertial link is used instead of the differential link to avoid the high-frequency interference to the input signal. Thirdly, the small signal model of DC microgrid is established, the stability of DC microgrid with virtual inertial control is analyzed, and the selection range of virtual inertial control coefficient is given. Finally, the DC microgrid model is established in Matlab/Simulink and the time-domain simulation is carried out to verify the validity of the proposed control strategy and the correctness of the stability analysis.
【作者單位】: 新能源電力系統(tǒng)國家重點(diǎn)實(shí)驗(yàn)室(華北電力大學(xué));國網(wǎng)菏澤供電公司;
【分類號】:TM727
[Abstract]:Considering the potential inertial support ability of each rotating equipment and energy storage equipment in DC microgrid, the virtual inertial control of DC microgrid is proposed in view of the low inertia of DC microgrid and poor anti-interference ability of bus voltage. Firstly, the general expression of inertia power provided by controlled power supply in DC microgrid is given. The inertia power is directly determined by DC bus voltage variation and virtual inertia control coefficient. Secondly, in the design of the additional inertial control of each converter, the first-order inertial link is used instead of the differential link to avoid the high-frequency interference to the input signal. Thirdly, the small signal model of DC microgrid is established, the stability of DC microgrid with virtual inertial control is analyzed, and the selection range of virtual inertial control coefficient is given. Finally, the DC microgrid model is established in Matlab/Simulink and the time-domain simulation is carried out to verify the validity of the proposed control strategy and the correctness of the stability analysis.
【作者單位】: 新能源電力系統(tǒng)國家重點(diǎn)實(shí)驗(yàn)室(華北電力大學(xué));國網(wǎng)菏澤供電公司;
【分類號】:TM727
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