本文選題：直流配電網(wǎng)　切入點(diǎn)：分布式電源　出處：《華北電力大學(xué)(北京)》2017年博士論文

【摘要】：隨著分布式電源在配電網(wǎng)中滲透率的增加,其穩(wěn)定性和可靠性問(wèn)題變得尤為復(fù)雜。直流配電網(wǎng)兼具靈活性與高效性的優(yōu)點(diǎn),且不存在無(wú)功環(huán)流及功角穩(wěn)定等問(wèn)題,是分布式電源更為理想的組網(wǎng)方式。由于直流配電網(wǎng)中沒(méi)有無(wú)功和頻率問(wèn)題,其功率-電壓控制是穩(wěn)定及優(yōu)化運(yùn)行的核心技術(shù)。對(duì)于端數(shù)較多的直流配電網(wǎng)可采用一次調(diào)壓與二次調(diào)壓相結(jié)合進(jìn)行電網(wǎng)功率調(diào)節(jié),把復(fù)雜電網(wǎng)的穩(wěn)定運(yùn)行與優(yōu)化運(yùn)行在不同的時(shí)間尺度上進(jìn)行解耦控制。此外,在直流配電網(wǎng)中,各分布式電源通過(guò)電力電子變流器并網(wǎng),對(duì)直流系統(tǒng)的慣性幾乎沒(méi)有貢獻(xiàn),這將成為分布式能源大規(guī)模接入配電網(wǎng)之后面臨的新問(wèn)題。隨著能源結(jié)構(gòu)多樣化及用戶需求的精益化,對(duì)直流配電系統(tǒng)供電質(zhì)量及運(yùn)行特性的要求也在不斷提高。本文主要研究含分布式電源的直流配電網(wǎng)協(xié)調(diào)控制方法,以提高其暫態(tài)運(yùn)行穩(wěn)定性,改善系統(tǒng)運(yùn)行效率及供電質(zhì)量。主要工作及成果如下:1.建立了包含風(fēng)力發(fā)電的直流配電網(wǎng)各單元數(shù)學(xué)模型,包括永磁風(fēng)電機(jī)組、蓄電池儲(chǔ)能單元、聯(lián)網(wǎng)變流器以及交直流負(fù)荷的數(shù)學(xué)模型。研究了直流配電網(wǎng)中各單元的傳統(tǒng)控制策略及系統(tǒng)運(yùn)行特性,為各單元慣性控制策略的提出,及預(yù)測(cè)控制模型的建立奠定了基礎(chǔ)。2.提出了直流配電網(wǎng)一次與二次電壓控制相結(jié)合的調(diào)壓體系。在電壓分段一次調(diào)壓方法的基礎(chǔ)上,深入研究系統(tǒng)各單元控制響應(yīng)特性,提出了直流配電網(wǎng)自適應(yīng)慣性調(diào)節(jié)方法,以解決直流配電網(wǎng)低慣性問(wèn)題。對(duì)于風(fēng)力發(fā)電單元通過(guò)控制旋轉(zhuǎn)動(dòng)能的吸收或釋放來(lái)改善功率輸出特性,對(duì)于儲(chǔ)能及并網(wǎng)單元也可以通過(guò)改變相應(yīng)的控制參數(shù),虛擬出與直流電壓變化相適應(yīng)的慣性響應(yīng),增強(qiáng)了直流配電網(wǎng)的抗擾能力及暫態(tài)運(yùn)行穩(wěn)定性。3.提出了一種基于變流器模型的本地預(yù)測(cè)控制方法,以配合系統(tǒng)慣性調(diào)節(jié)時(shí)對(duì)變流器響應(yīng)快速性的要求。該方法中,在對(duì)各單元變流器數(shù)學(xué)模型進(jìn)行分析推導(dǎo)的基礎(chǔ)上,分別建立了機(jī)側(cè)變流器,網(wǎng)側(cè)變流器及儲(chǔ)能變流器預(yù)測(cè)控制模型。為消除數(shù)字執(zhí)行過(guò)程的單步延時(shí),引入了兩步預(yù)測(cè)誤差函數(shù)從而形成了多目標(biāo)優(yōu)化。采用分類排序法選擇目標(biāo)向量,解決了傳統(tǒng)基于PI的雙閉環(huán)控制參數(shù)整定繁瑣的問(wèn)題。將基于變流器模型的預(yù)測(cè)控制方法與慣性調(diào)節(jié)相結(jié)合,提高了系統(tǒng)控制響應(yīng)速度,增強(qiáng)了直流配電網(wǎng)暫態(tài)運(yùn)行穩(wěn)定性。4.設(shè)計(jì)了基于模型預(yù)測(cè)控制器的風(fēng)電直流配電網(wǎng)集散控制系統(tǒng)。為滿足系統(tǒng)經(jīng)濟(jì)運(yùn)行及高質(zhì)量電能的要求,采用模型預(yù)測(cè)控制器作為其集散控制體系架構(gòu)中的主控制單元,以產(chǎn)生本地控制器優(yōu)化參考信號(hào)。本地控制器根據(jù)系統(tǒng)運(yùn)行狀態(tài)特性,在優(yōu)化參考值的基礎(chǔ)上對(duì)系統(tǒng)運(yùn)行狀態(tài)進(jìn)行細(xì)調(diào)。同時(shí)采用冗余參考信號(hào),通信故障時(shí)采用基于直流電壓的系統(tǒng)功率分配方案,以規(guī)避該分層控制結(jié)構(gòu)中通信故障對(duì)系統(tǒng)穩(wěn)定性的影響,如此,既能夠保證正常運(yùn)行時(shí),系統(tǒng)高效運(yùn)行及對(duì)電能質(zhì)量的要求,又能在故障時(shí)保證系統(tǒng)不失穩(wěn)。
[Abstract]:With the increase of distributed generation in distribution network penetration, its stability and reliability problems become more complex. The DC power distribution network has advantages of both flexibility and efficiency, and does not exist without the problems of power circulation and power angle stability, power is distributed more ideal network. Because of the lack of reactive power and frequency of the DC power distribution in the net, the power voltage control is the core technology of stable and optimal operation. Using a voltage and the two voltage combined power adjustable DC power distribution network for a large number of end, the complex grid stable operation and optimal operation of decoupling control in different time scales in addition. And in the DC distribution network, the distributed power grid through power electronic converters of DC, the inertia of the system is almost no contribution, it will be faced after the large-scale distributed energy distribution network access The new problem. With the energy structure diversification and user needs to lean, DC distribution system and operation characteristics of the power quality requirements are constantly improved. Coordinated control method of DC power distribution network is mainly studied in this paper with distributed power, in order to improve the transient stability, improve system efficiency and power quality. The main work and achievements are as follows: 1. the DC distribution network of each unit mathematical model including wind power, including the permanent magnet wind generator, battery energy storage unit, the mathematical model of AC / DC converter and network load. On the operating characteristics of the traditional control strategy and system of each unit of DC distribution network, for each unit inertia control strategy the prediction model, and laid the foundation for.2. proposed a DC distribution network and the two voltage control combined pressure regulating system. In section one voltage Based on the voltage regulating method, in-depth study of the system of each unit control response characteristics, put forward the adaptive inertia DC distribution network adjustment method to solve the DC distribution network low inertia problem. For wind power generation unit by controlling the rotational kinetic energy absorption or release to improve the power output characteristics for energy storage and grid unit can shift the corresponding control parameters, virtual and DC voltage changes to adapt to the inertial response, enhance the anti disturbance capability and transient stability of the.3. DC power distribution network presents a predictive control method based on local model of converter, to match the system inertia quick response requirements for converter during adjustment. In this method, the for each unit converter mathematical model is derived on the basis of machine side converter are established respectively, and the grid side converter converter model for predictive control. Eliminate one step delay of digital implementation process, the introduction of the two step prediction error function to form a multi-objective optimization. Select the target vector by sorting method, to solve the traditional double closed loop PI control parameter tuning based on complicated problems. The prediction model of converter control system and inertial modulation method based on improved system the control response speed, enhance the transient stability of the.4. DC power distribution network design model predictive controller of wind power DC power distribution network based on the distributed control system. In order to satisfy the system requirements of high quality and economic operation of electric energy, a model predictive controller as the main control unit of distributed control system architecture, to optimize the local controller reference signal the local controller. According to the characteristics of the running state of the system, for fine-tuning the operation state of the system on the foundation of the optimum reference value. At the same time using redundancy More than the reference signal, the system power allocation scheme based on DC voltage communication fault, to avoid the influence of hierarchical control structure in communication fault on the stability of the system, which can ensure the normal operation, efficient operation of the system and the requirements of power quality, but also in the failure to prevent system instability.

【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM721.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 段雙明;郭陽(yáng);任俊;靳利光;吳薇;;含分布式電源的低壓直流配電網(wǎng)研究綜述[J];東北電力大學(xué)學(xué)報(bào);2015年06期

2 劉佳易;秦文萍;韓肖清;柳雪松;朱旋;;交直流雙向功率變換器的改進(jìn)下垂控制策略[J];電網(wǎng)技術(shù);2014年02期

3 宋強(qiáng);趙彪;劉文華;曾嶸;;智能直流配電網(wǎng)研究綜述[J];中國(guó)電機(jī)工程學(xué)報(bào);2013年25期

4 李和明;董淑惠;王毅;任亞釗;;永磁直驅(qū)風(fēng)電機(jī)組低電壓穿越時(shí)的有功和無(wú)功協(xié)調(diào)控制[J];電工技術(shù)學(xué)報(bào);2013年05期

5 孔小兵;劉向杰;;雙饋風(fēng)力發(fā)電機(jī)非線性模型預(yù)測(cè)控制[J];自動(dòng)化學(xué)報(bào);2013年05期

6 溫家良;吳銳;彭暢;王宇;;直流電網(wǎng)在中國(guó)的應(yīng)用前景分析[J];中國(guó)電機(jī)工程學(xué)報(bào);2012年13期

7 江道灼;鄭歡;;直流配電網(wǎng)研究現(xiàn)狀與展望[J];電力系統(tǒng)自動(dòng)化;2012年08期

8 吳衛(wèi)民;何遠(yuǎn)彬;耿攀;錢照明;汪i襠，

本文編號(hào)：1658123