【摘要】：受微電網(wǎng)線路阻抗不匹配等因素影響,傳統(tǒng)下垂控制常存在無功均衡問題。應(yīng)用虛擬阻抗方法可以抑制無功均衡誤差。然而,傳統(tǒng)虛擬阻抗方法沒有充分考慮微電網(wǎng)網(wǎng)絡(luò)中的不匹配因素。為了提高無功均衡準(zhǔn)確度,提出了一種基于微電網(wǎng)全局無功均衡誤差最小化思想的虛擬阻抗優(yōu)化方法。通過微電網(wǎng)網(wǎng)絡(luò)建模,推導(dǎo)了網(wǎng)絡(luò)無功均衡誤差估算方法。然后,基于無功傳輸特性設(shè)計了自適應(yīng)虛擬阻抗控制器。在此基礎(chǔ)上,構(gòu)建全局無功均衡誤差計算函數(shù)并優(yōu)化,以獲得最優(yōu)控制器參數(shù)。該方法實施無需通訊,可在結(jié)構(gòu)復(fù)雜的微電網(wǎng)中應(yīng)用。相比傳統(tǒng)虛擬阻抗方法,優(yōu)化后的虛擬阻抗控制具有網(wǎng)絡(luò)自適應(yīng)能力,且無功均衡性能更為良好。仿真和實驗結(jié)果均驗證了所提方法的有效性。
[Abstract]:Under the influence of line impedance mismatch and other factors, the traditional droop control often exists reactive power equalization problem. The reactive power equalization error can be suppressed by using the virtual impedance method. However, the traditional virtual impedance method does not fully take into account the mismatch factors in microgrid networks. In order to improve the accuracy of reactive power equalization, a virtual impedance optimization method based on minimization of global reactive power equalization error is proposed. The estimation method of reactive power equalization error is derived by modeling microgrid network. Then, an adaptive virtual impedance controller is designed based on reactive power transmission characteristics. On this basis, the global reactive power equalization error calculation function is constructed and optimized to obtain the optimal controller parameters. This method can be used in complex microgrid without communication. Compared with the traditional virtual impedance method, the optimized virtual impedance control has the adaptive capability of the network and the better performance of reactive power equalization. The effectiveness of the proposed method is verified by both simulation and experimental results.
【作者單位】： 西安交通大學(xué)電氣工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(51177130,51407133)~~
【分類號】：TM727

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