本文選題：分布式電源 + 不確定性�。� 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：配電網(wǎng)直接面向用戶并承載電網(wǎng)的主要負(fù)荷,其配置的合理與否直接關(guān)系供電質(zhì)量并影響居民用電和社會(huì)效益。隨著經(jīng)濟(jì)的發(fā)展,社會(huì)對(duì)用電的量與質(zhì)的要求都不斷提高,配電網(wǎng)網(wǎng)架的升級(jí)和擴(kuò)增也亟待進(jìn)行;近年來分布式電源(distributed generation,DG)在配電網(wǎng)中的滲透率逐步提高并對(duì)配電網(wǎng)產(chǎn)生了較大的影響,其合理的規(guī)劃將對(duì)配電網(wǎng)的優(yōu)化規(guī)劃和運(yùn)行具有重要的意義;此外,隨著直流負(fù)荷密度的不斷攀升,交直流混合配電網(wǎng)的研究也逐漸火熱。在上述背景下,本文針對(duì)含DG的配電網(wǎng)規(guī)劃問題做了如下的工作:首先,針對(duì)DG出力和負(fù)荷的不確定性,提出了一種基于時(shí)序特性劃分和混合聚類的多場(chǎng)景分析方法。通過分析DG出力和負(fù)荷所受影響因素的特點(diǎn),將各單元的時(shí)序特性劃分為多個(gè)典型時(shí)序情形;在每種情形內(nèi),基于大量歷史數(shù)據(jù)采用混合聚類算法得到若干個(gè)具有特定概率的場(chǎng)景,并以期望、標(biāo)準(zhǔn)差、偏度和峰度四個(gè)統(tǒng)計(jì)指標(biāo)驗(yàn)證了生成的場(chǎng)景集與原始數(shù)據(jù)集的接近性。該方法將不確定性因素量化成了場(chǎng)景集,為考慮不確定性因素的配電網(wǎng)規(guī)劃奠定了基礎(chǔ)。其次,針對(duì)DG與配電網(wǎng)網(wǎng)架在協(xié)調(diào)規(guī)劃中的相互影響,提出了一種基于啟發(fā)式智能算法的嵌套式改進(jìn)雙層規(guī)劃方法,并基于時(shí)序多場(chǎng)景建立了交流配電網(wǎng)中DG與網(wǎng)架的多目標(biāo)雙層協(xié)調(diào)規(guī)劃模型。上下層模型分別決策網(wǎng)架配置和DG配置,并分別從系統(tǒng)全局最優(yōu)和DG效益最大化出發(fā)建立目標(biāo)函數(shù)。該模型可通過上下層的嵌套求解保證種群中各網(wǎng)架與DG的最優(yōu)組合,進(jìn)而解決了兩者的相互影響。通過算例分析,時(shí)序多場(chǎng)景方法和嵌套式雙層方法的優(yōu)越性得到了驗(yàn)證。再次,提出了一種考慮網(wǎng)架直流改造和直流網(wǎng)架擴(kuò)建的規(guī)劃方法,并基于時(shí)序多場(chǎng)景建立了含DG的交直流混合配電網(wǎng)規(guī)劃模型。該規(guī)劃模型將DG配置、待直流改造的網(wǎng)架、擴(kuò)建網(wǎng)架的接入位置及是否以直流形式接入作為決策變量,目標(biāo)函數(shù)中考慮了DG與網(wǎng)架投資、DG及負(fù)荷的換流器投資、網(wǎng)損和電壓穩(wěn)定性等。算例表明該規(guī)劃方法可有效地將交流配電網(wǎng)改造成交直流混合配電網(wǎng),為交直流混合配電網(wǎng)的發(fā)展提供了較好的參考。
[Abstract]:The distribution network is directly oriented to users and carries the main load of the power network. Whether the distribution network is reasonable or not is directly related to the quality of power supply and affects the power consumption and social benefits of the residents. With the development of economy, the demand of the quantity and quality of electricity is raised constantly, and the upgrade and expansion of the distribution network are urgently needed. In recent years, the permeability of distributed generation (DG) in the distribution network has been gradually increased and has a great impact on the distribution network. Its reasonable planning will be of great significance to the optimal planning and operation of the distribution network. With the increasing of DC load density, the research of AC / DC hybrid distribution network is becoming more and more hot. Under the above background, the following work has been done in this paper for the distribution network planning problem with DG: firstly, a multi-scene analysis method based on time-series characteristic partitioning and hybrid clustering is proposed for the uncertainty of DG output and load. By analyzing the characteristics of the factors affecting the output and load of DG, the timing characteristics of each unit are divided into several typical time series cases, and in each case, Based on a large number of historical data, a number of scenarios with specific probability are obtained by using mixed clustering algorithm, and the proximity of the generated scene set to the original data set is verified by four statistical indicators: expectation, standard deviation, bias and kurtosis. This method quantifies uncertainty factors into scene sets, which lays a foundation for distribution network planning considering uncertainty factors. Secondly, aiming at the interaction between DG and distribution network in coordination planning, a nested improved bilevel programming method based on heuristic intelligent algorithm is proposed. A multi-objective bilevel coordination programming model of DG and grid in AC distribution network is established based on time series and multi-scene. The upper and lower layer models respectively decide the network configuration and DG configuration, and set up the objective function from the view of the global optimization and the maximization of DG benefit respectively. The model can be solved by nesting the upper and lower layers to ensure the optimal combination of each grid and DG in the population, thus solving the interaction between the two. The superiority of the time series multi-scene method and the nested double-layer method is verified by example analysis. Thirdly, a planning method considering DC transformation of grid and expansion of DC grid is proposed, and a DG hybrid distribution network planning model with DG is established based on time series multi-scene. In this model, the DG configuration, the network structure to be transformed by DC, the access position of the extended grid and whether the direct current access is taken as the decision variable are considered in the objective function. The investment of DG and the investment of the DG and the load converter are considered in the objective function. Network loss and voltage stability. The example shows that this planning method can effectively transform the AC distribution network into the AC / DC hybrid distribution network and provide a good reference for the development of the AC / DC hybrid distribution network.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM715

【參考文獻(xiàn)】

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本文編號(hào)：2053521