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基于功率从属性追踪的电网节点成本分析
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摘要
市场下的输电服务基本问题不再是优先解决电力用户的用电需求,而是要明确地定义输电服务、用户使用输电系统的权利以及相应的服务成本,并将其服务平等地提供给任何市场参与者以及科学合理地分摊其成本。论文提出以功率分量费用流守恒原理为输电经济成本分析的经济准则。在电网断面潮流已知的情况下,将功率分量视为费用载体,各负荷节点单位电力成本视为功率分量的费用流在电网中流动的结果。功率分量在节点和元件上的费用流守恒体现了收支平衡的原则和能量传输过程中因损耗引起的经济成本的变化。
     论文提出了一种基于功率从属性分析的节点输电成本分析方法,采用功率分量理论作为该方法的物理理论基础;以功率分量费用流守恒原理作为经济原则,根据电网中解耦后的电源功率分布得出了各电源在电网中的各节点的单位电力成本的分析与计算模型;按各电源的节点单位电力成本与各电源在不同节点处的功率比重加权平均得出了电网中任意节点的单位电力成本。在潮流断面和购电节点购电价格已知的情况下,该方法直观的得出了计及网损的负荷节点单位电力成本与电源购电价格的表达式,适用于不同电源不同购电价格的情况下的负荷节点成本分析。同时,论文根据功率分量理论,构建了电网负荷功率从属性追踪模型;结合功率分量费用流守恒原理在断面潮流与负荷节点售电价格已知的情况下,得出了计及网损情况下电源节点购电成本与负荷节点售电价格的解析表达式。
     电网等值问题是一个经典的物理问题,但是随着电力工业市场化改革,当物理潮流与电网经济分配结合在一起,其对输电成本分配的影响目前尚未有详细的理论结果。本文基于功率分量理论和费用流守恒原理利用数学等值方法,给出了等值前后内部网络的功率分布特征解析表达式,并得出了等值前后内部网络中节点单位电力成本不变的条件。最后得出结论,在一般情况下电网等值计算会引起内部网络输电成本的变化。
     在我国电力市场初期,购电方未进入市场,终端销售电价未放开,同时市场中相当大比例还需要通过长期、中期、短期的合同来完成交易的情况下,上述负荷节点输电成本分析和购电节点成本分析方法有利于市场运营机构分析把握电网中各节点成本盈亏情况。通过对电网等值对输电成本分配的影响的研究,为我国电力市场改革下一步输配分开后的配电网经济成本分析提供了理论基础。
In the power market, the function of transmission service is not only limited in satisfying the user’s the power demand, but also clearly defining transmission service and the user’s right and cost of using transmission system. It requires justice to provide the transmission service to market participant and reasonable locate the transmission cost. This dissertation proposed the power component cost flow conservation principle as the fundamental of transmission cost analysis. At the situation of the power flow and generator’s on-grid price is given, the power component is regard as the carrier of cost, the unit cost of load node is regard as the flowing result of power component cost flow. The conservation of power component cost flow in transmission node and element indicates the income & expenses balance and the cost variety caused by net-loss.
     This dissertation presents a node transmission cost analysis method based on the analysis of power dependency. At first, this method adopts the power component theory as the physical theory base of the method to solve the source dependency problem of branch power in electric network at physical view. Next, the analytical and computation module of the source’s unit power cost at network’s each node is gotten by adopting node cost flow conservation principle as economic fundamental. At last, the unit power cost of any node in the network is educed according to each source’s node unit power cost and each source’s power proportion weighted mean at different nodes. This method is clear in physical idea, it can directly conclude the intuitionist expression of each node’s unit power cost in network and source’s purchase price considered net-loss in the situation of the power flow and generator’s on-grid price is given. It suits for the instance of different sources having different purchase price. At also, the load-power source dependency trace model is educed according to power component theory, combined the power component cost flow conservation the relationship considered net-loss between source node power unit purchase cost and load node power sell price consider is gotten at the situation of the power flow and load node sell price is given.
     Network equivalence problem is a classical physical problem, but at present there isn’t detail theoretical result of its influence to the distribution of transmission cost when physical flow and network economic distribution are combined together as market development. Whether the transmission and distribution cost of the power network vary or net after the network equivalence is a new problem of power market research. This dissertation gives the equivalent network’s power distribution characteristic analytic expression before or after equivalence, and educes the condition of node unit power cost invariability in the equivalent network before or after equivalence by using power component theory and cost flow conservation principle and using mathematics equivalence method. Finally there is a conclusion that network equivalent compute can lead to the variation of the equivalent network’s transmission cost in general instance.
     In initial stage of our country’s power market, the purchaser didn’t enter the market, terminal sell price unloosen, while in sizeable proportion need long-time, middle-time, short-time contract to complete trade in market, above load node transmission cost analysis and purchase node purchase cost analysis method are propitious for market manage organization to analyze and master each node’s cost balance. By the research on the network equivalence’s influence to the distribution of transmission cost distribution, this paper establishs a base to the distribution network economic cost analysis after our country’s power market’s next reformation, that is, transmission and distribution are disjoined.
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