計及電壓穩(wěn)定約束的微電網(wǎng)動態(tài)最優(yōu)潮流
發(fā)布時間:2018-01-05 14:01
本文關(guān)鍵詞:計及電壓穩(wěn)定約束的微電網(wǎng)動態(tài)最優(yōu)潮流 出處:《電力系統(tǒng)自動化》2017年14期 論文類型:期刊論文
更多相關(guān)文章: 微電網(wǎng)(微網(wǎng)) 動態(tài)負荷 小擾動電壓穩(wěn)定指標 內(nèi)點法 動態(tài)最優(yōu)潮流
【摘要】:為使微電網(wǎng)并網(wǎng)運行滿足電壓穩(wěn)定性和經(jīng)濟性要求,將改進后的小擾動電壓穩(wěn)定指標引入微電網(wǎng)最優(yōu)潮流模型中,并研究了多時段動態(tài)負荷下的最優(yōu)潮流算法。在有載調(diào)壓變壓器模型中引入虛擬節(jié)點,以消除模型中的變比及因變比而產(chǎn)生的高階項,并計及分布式電源及儲能單元的影響在直角坐標系中建立了微電網(wǎng)動態(tài)優(yōu)化潮流的二階新模型。進一步通過在拉格朗日方程進行泰勒展開時保留高階項和利用近似最小度算法進行節(jié)點優(yōu)化編號,對傳統(tǒng)內(nèi)點法進行改進。修正計算中所使用的常系數(shù)海森矩陣與改進內(nèi)點法相結(jié)合,從而提出一種常系數(shù)海森矩陣內(nèi)點法,有效地解決了計算精度與迭代效率之間的矛盾。在ETAP環(huán)境下建立微電網(wǎng)模型,應(yīng)用所提方法進行優(yōu)化計算,計算結(jié)果表明,在改進的小擾動電壓穩(wěn)定指標約束下,所提模型和算法能夠滿足微電網(wǎng)運行經(jīng)濟性和電壓穩(wěn)定性的要求。
[Abstract]:In order to meet the requirements of voltage stability and economy, the improved small disturbance voltage stability index is introduced into the optimal power flow model of microgrid. The optimal power flow algorithm under multi-period dynamic load is studied. The virtual node is introduced into the load regulating transformer model to eliminate the variable ratio and the higher order term caused by the variable ratio in the model. Taking into account the influence of distributed power generation and energy storage unit, a new second-order model for dynamic power flow optimization of microgrid in right-angle coordinate system is established. Furthermore, the higher-order term is retained and the near term is utilized in Taylor expansion of Lagrangian equation. The similar minimum degree algorithm is used to optimize the number of nodes. The traditional interior point method is improved, and the constant coefficient Heyson matrix is combined with the improved interior point method, and a constant coefficient Heyson matrix interior point method is proposed. The contradiction between calculation accuracy and iteration efficiency is solved effectively. The model of microgrid is established in ETAP environment, and the proposed method is applied to optimize calculation. The calculation results show that. Under the constraint of the improved small disturbance voltage stability index, the proposed model and algorithm can meet the requirements of microgrid operation economy and voltage stability.
【作者單位】: 山東科技大學(xué)電氣與自動化工程學(xué)院;青島龍發(fā)熱電有限公司;
【基金】:山東省科技發(fā)展計劃資助項目(2012G0020503) 國家電網(wǎng)公司科技項目“含多微網(wǎng)的配電系統(tǒng)建模與運行特性研究”~~
【分類號】:TM727;TM74
【正文快照】: 上網(wǎng)日期:2017-05-09。0引言風(fēng)機、光伏等分布式電源(DG)以微電網(wǎng)形式并入到大電網(wǎng)中,在一定程度上提高了電力系統(tǒng)能源利用率,改善了能源結(jié)構(gòu),緩解了能源需求與能源短缺、能源利用與環(huán)境保護之間的矛盾,但因其固有的隨機性和間歇性對微電網(wǎng)電壓穩(wěn)定、網(wǎng)絡(luò)損耗等問題均產(chǎn)生了不
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