复杂配电网的合环分析与调控措施研究

发布时间：2018-07-03 04:31

本文选题：配电网 + 合环操作　；参考：《哈尔滨工业大学》2014年硕士论文

【摘要】：在电力系统中，配电网是与电力用户关系最为紧密的部分，其供电可靠性问题是电网公司和电力用户都比较关注的问题。当配电网的某些线路需要检修或出现故障要进行倒负荷时，可通过合环操作来实现以避免电力用户的短时停电，但是合环操作也可能会影响到电力系统的安全稳定运行，因为在此过程中可能会产生较大的稳态电流和冲击电流。本文首先介绍了配电网合环的概念并将合环操作进行了模式分类，同时指明了在合环过程中产生合环电流的主要原因，并对配电网在执行合环操作时所需满足的一些首要前提进行了说明。准确的合环电流计算是合环操作能够得以安全进行的重要前提，因此本文通过对外部系统进行等值建立了简化的配电网合环操作模型，，然后在此模型基础上对合环电流的的计算方法进行了研究。此外本文通过数学表达式的推导研究了影响合环电流产生的关键因素，同时以PSASP为平台对某地电网的合环进行了仿真，验证了合环点电压幅值差和相角差对合环电流的影响。同时对配电网合环能否安全进行的判断条件进行了研究，在此基础了提出了减小合环电流的一些调整措施且对其灵敏度进行了计算，并利用PSASP仿真工具对各种调控措施的实际效果进行了仿真验证。最后，本文结合某地油田电网的实际情况分析了其合环电流易越限的薄弱环节，并给出了相对应的调整措施，对该油田电网的经济效益和社会效益产生了积极的影响。
[Abstract]:In the power system, the distribution network is the most closely related to the power users, its power supply reliability issues are concerned by both the power grid companies and power users. When some lines of the distribution network need to be overhauled or faulty, they can be realized by closed loop operation to avoid short term power outages, but the closed loop operation may also affect the safe and stable operation of the power system. In this process, large steady current and impulse current may be generated. This paper first introduces the concept of closed loop in distribution network and classifies the mode of closed loop operation. At the same time, it points out the main reasons for producing closed loop current in the process of closing loop. Some primary prerequisites for distribution network to be satisfied in the operation of closed loop operation are also explained. Accurate calculation of closed loop current is an important prerequisite for safe operation of closed loop operation, so a simplified closed loop operation model of distribution network is established by equivalent of external system. Then the calculation method of involutive loop current is studied on the basis of the model. In addition, the paper studies the key factors that affect the generation of loop current through the derivation of mathematical expression. At the same time, the paper simulates the loop of a local power network on the platform of PSASP, and verifies the influence of voltage amplitude difference and phase angle difference on the current of the closed loop. At the same time, the judging conditions of the safety of the closed loop in the distribution network are studied. On this basis, some adjustment measures to reduce the closing current are put forward and the sensitivity is calculated. The PSASP simulation tool is used to verify the actual effect of various control measures. Finally, combined with the actual situation of a certain oilfield power network, this paper analyzes the weak link of its closed loop current easily overrunning, and gives the corresponding adjustment measures, which have a positive impact on the economic and social benefits of the oil field grid.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM711

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