三级电网体系结构智能规划的若干关键问题研究
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摘要
随着我国特高压建设、大规模风电并网等重大工程的推进,以及电动汽车充电站、微电网的接入电网,建设以特高压电网为骨干网架、各电压等级电网协调发展的坚强智能电网已成为当前电网发展中的迫切性问题。基于以上问题,本文分析了智能电网构架下三级电网体系结构,对三级电网规划中的一些关键问题进行了研究。
     研究了智能电网架构下三级电网体系结构。基于当前电网的实际发展趋势,结合智能电网的规划要求,重点研究了三级电网的网架规划中的以下关键问题:输电网接受大规模风电能力及落点规划,配电网中电动汽车充换电站的优化布点,以及微电网的高渗透率配置。
     针对电网中大规模风电的接纳能力及落点问题,提出了一种基于熵权决策理论的大规模风电落点优选方法。该方法将主观的专家权重与客观的熵权结合,建立了可以全面评估大规模风电接入受端电网的安全稳定水平、电力电量需求、网架结构和经济性等重要因素的评价指标体系,可有效的解决大规模风电通过特高压专用通道远距离输送至远端负荷中心的落点优选这一复杂多目标决策问题。以某省电网为算例,仿真分析了接纳北方的大规模风电的能力及落点,验证了本文方法及评估指标的有效性。
     提出了基于多层次模糊综合评判方法的在电网中电动汽车充电站优化配置的规划原则及方法。研究了电动汽车充电站充放电时对电网稳定性,及充放电产生的谐波对电网的电能质量的影响。在此基础上分析了影响充电站规划的一些电网因素,采用多层次模糊综合评判方法建立了电动汽车充换电设施的规划模型,研究了充电站在配电网中的优化配置原则和方法。对充电站充放电对配电网中的稳定性和谐波影响进行了仿真分析,应用多层次模糊综合评判方法计算了充电站在配电网中的布点。
     提出了基于整个电网全局角度考虑的微网选址原则,研究了含微网的大电网的可靠性、经济性评估方法。以增强电网稳定性、降低网损、提高供电可靠性为目标,研究了高渗透率微网对大电网的安全稳定、经济运行的技术可行性。分析了高渗透率微网的经济可行性,提出了一整套高渗透率下微网的综合经济效益定量评估的新方法,可有效的评价微网高渗透率接入电网后经济性。仿真分析了微网在大电网中配置对电网的影响,计算了微网配置后的综合经济效益。
     本文的研究可有效解决我国大规模风电在电网中的消纳问题,为清洁能源的大规模使用奠定基础;高渗透率微网及电动汽车充电站在电网中优化配置,可有效提高供电可靠性、大电网的安全稳定性及综合经济效益,将为智能电网进一步发展奠定一定的理论基础。
The development of strong smart grid which make the Ultra-High Voltage transmission system a backbone network of the state grid and coordinate of different voltage level network is becoming an urgent issue, with the constructing of the Ultra-High Voltage transmission system and the connecting of large scale wind power, the connecting of EV charging station and micro grid. Based on the above problem, this paper analyzes three level power grid in the framework of smart-grid, and discusses the key issue in the three level power networks.
     The architecture of three-level power grid in the framework of smart-grid has been discussed Based on the developing trend of state grid and the demand of the smart-grid programming. This paper studied the following key issues in three-level power grid's programming:the capacity of accepting large-scale wind power and the selection of landing location, optimize the layout for electric car charging in the distribution network, and the high permeability configuration of micro-grid.
     The capacity of accepting large-scale wind power and the selection of landing location have been discussed. The optimization method of the selection of landing location of wind power has been put forward, which is based on the Entropy weighted decision theory. This method combines the subjective expert's weight with objective entropy weight. Based on this method, an index system which can evaluate the security and stability level, the demand of power, vulnerability of grid structure, economic performances, etc, has been established. This method can solve the complex multi-objective optimization of landing location in large-scale wind power transmitted by the Ultra-High Voltage transmission system. Take province H for example, the simulation results shows the effectiveness of this method.
     A optimization layout principle and method of EV charging station in Distribution network have been put forward, which is based on the multiple fuzzy comprehensive evaluation method. The stability and harmonics impact of charge-discharge in EV charging station have been analyzed. And some other factors are thought which may influence the EV charging station's programming. The programming model of EV charging station has been established. And the planning principle in optimizing the layout of EV charging station is studied. The impact of stability and harmonics were analyzed by simulation computing, and the optimizing layout of EV charging station was decided.
     The layout principle of micro-grid has been put forward, based on an overall power grid. And the economic and reliability evaluation method has been studied. On the purpose of enhancing the stability, reducing power loss and increasing reliability, the impact of micro-grid's accessing to Distribution network has been studied. And a new method of evaluating the economic performance of high permeability micro-grid's accessing to Distribution network has been put forward. At last, the simulation analysis on the example of Province H has been carried out. The economic performance with the micro-grids has been calculated.
     This paper provides efficiency solution of large-scale wind power, which laid the foundation of clean energy. The methods of optimizing layout of EV charging station and high permeability micro-grid in Distribution network, which can increase reliability, security and stability, and economic performance of power grid, will make contributions for the development of smart-gird.
引文
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