密山风力发电站接入对鸡西220kV电网继电保护的影响研究
发布时间：2018-12-29 08:25
【摘要】：能源和环境问题是本世纪最具挑战性的问题之一,为了应对这一挑战,开发和利用可再生能源成了世界各国的共同选择。按照我国目前对能源的消耗速度,传统的化学资源在多年之后将面临枯竭,寻找替代化学能源及利用可再生能源成为我国经济发展的决定力量。近年来政府大力推进风能、太阳能、小水电、生物质能的发展,以期改变对传统化学能源的依赖。 风力发电,就是我们利用风能最常见的形式。风能是太阳辐射下流动所形成的,与其他能源相比,具有明显的优势,它蕴藏量大,分布广泛；风能具有间歇性、不稳定性,造成风电场接入电网后会对电网的运行产生巨大影响。同时,解决风电这种新型电源入网难题,也是智能电网今后发展的一个方向。 大规模风电接入系统后,对原有的220kV输电网继电保护和安全自动装置运行的势必产生影响,联网线路的快速保护配置方案将输电网原有的纵联保护改造为系统侧单端的距离保护及零序电流保护,这是风电场接入电网时,其并网线路保护存在的统一问题。随着风电并网容量的逐年增大,非常有必要讨论其对现有继电保护的影响,从而调整相应的保护系统,使其能更好地配合现有的保护装置。 本文以鸡西电网运行方式及电网参数、密山风力发电站风电机群参数为依据,对密山变电站的220kV母线故障及密山风电场220kV母线故障进行了计算,评价当前保护的配置及整定计算中存在的问题。 风电接入系统后,为达到快速切除联网线路故障,对配置主保护和后备保护的必要性进行了详细阐述,指出风电接入后传统的微机保护已不再满足运行要求；同时,对风电接入后纵联保护以及后备保护的影响进行定性分析；针对过渡电阻引起的附加阻抗做定性分析；并在分析基础上提出双端故障测距方法。 接下来,按照继电保护配置要求及继电保护整定原则,密山风电场接入鸡西220kV电网对继电保护装置的影响做定性评价；在风电电源状态转换情况下正反方向对称和不对称故障,详细论证电网端和风电场端各保护的动作情况。针对当前的密山风电场保护配置状况,提出风电接入鸡西220kV电网,其保护功能配置改善及整定计算过程中需要注意的问题。 论文课题来自生产实践密切关注的问题。这些问题的深入探讨和解决可为风电的并网线保护的配置和整定实践提供若干参考依据,并对黑龙江省风电与电网的协调发展起到促进作用。
[Abstract]:Energy and environment is one of the most challenging problems in this century. In order to meet this challenge, the development and utilization of renewable energy has become a common choice in the world. According to the current consumption rate of energy in China, the traditional chemical resources will be exhausted after many years, so finding alternative chemical energy and using renewable energy becomes the decisive force for the economic development of our country. In recent years, the government has vigorously promoted the development of wind, solar, small hydropower, biomass energy, in order to change the dependence on traditional chemical energy. Wind power is the most common form of wind power we use. Wind energy is formed by the flow of solar radiation. Compared with other energy sources, wind energy has obvious advantages, it has a large potential and wide distribution. Wind energy is intermittent and unstable, which will have a great impact on the operation of power grid after the wind farm is connected to the power grid. At the same time, solving the problem of wind power, which is a new type of power supply, is also a direction of smart grid development in the future. After large-scale wind power is connected to the system, it is bound to have an impact on the operation of the relay protection and safety automatic devices in the original 220kV transmission network. The scheme of fast protection configuration of connected lines transforms the original longitudinal protection of transmission network into single-terminal distance protection and zero-sequence current protection, which is a unified problem when wind farm is connected to the power network and its grid-connected line protection exists. With the increase of wind power grid capacity year by year, it is necessary to discuss its influence on the existing relay protection, so as to adjust the corresponding protection system and make it more suitable for the existing protective devices. Based on the operation mode and power network parameters of Jixi power grid and the wind power cluster parameters of Mishan wind power station, this paper calculates the 220kV busbar fault of Mishan substation and the 220kV busbar fault of Mishan wind farm. The problems existing in the configuration and setting calculation of current protection are evaluated. After wind power access system, in order to quickly remove the fault of network line, the necessity of installing main protection and backup protection is expounded in detail, and it is pointed out that the traditional microcomputer protection no longer meets the requirements of operation after wind power access. At the same time, the influence of longitudinal protection and backup protection after wind power access is analyzed qualitatively; the additional impedance caused by transition resistance is analyzed qualitatively; and a two-terminal fault location method is proposed based on the analysis. Then, according to the requirements of relay protection configuration and the principle of relay protection setting, the impact of Mishan wind farm connected to Jixi 220kV power grid on relay protection device is evaluated qualitatively. In the case of wind power source state conversion, the forward and negative symmetric and asymmetric faults are discussed in detail, and the actions of each protection at the end of power grid and wind farm are discussed in detail. In view of the current situation of protection configuration of Mishan wind farm, the paper puts forward some problems that should be paid attention to in the process of improving the configuration of protection function and setting calculation when wind power is connected to Jixi 220kV power grid. The topic of the thesis comes from the problem that the production practice pays close attention to. The discussion and solution of these problems can provide some reference basis for the configuration and setting practice of wind power line protection and promote the coordinated development of wind power and power grid in Heilongjiang Province.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614;TM77
本文编号：2394580
[Abstract]:Energy and environment is one of the most challenging problems in this century. In order to meet this challenge, the development and utilization of renewable energy has become a common choice in the world. According to the current consumption rate of energy in China, the traditional chemical resources will be exhausted after many years, so finding alternative chemical energy and using renewable energy becomes the decisive force for the economic development of our country. In recent years, the government has vigorously promoted the development of wind, solar, small hydropower, biomass energy, in order to change the dependence on traditional chemical energy. Wind power is the most common form of wind power we use. Wind energy is formed by the flow of solar radiation. Compared with other energy sources, wind energy has obvious advantages, it has a large potential and wide distribution. Wind energy is intermittent and unstable, which will have a great impact on the operation of power grid after the wind farm is connected to the power grid. At the same time, solving the problem of wind power, which is a new type of power supply, is also a direction of smart grid development in the future. After large-scale wind power is connected to the system, it is bound to have an impact on the operation of the relay protection and safety automatic devices in the original 220kV transmission network. The scheme of fast protection configuration of connected lines transforms the original longitudinal protection of transmission network into single-terminal distance protection and zero-sequence current protection, which is a unified problem when wind farm is connected to the power network and its grid-connected line protection exists. With the increase of wind power grid capacity year by year, it is necessary to discuss its influence on the existing relay protection, so as to adjust the corresponding protection system and make it more suitable for the existing protective devices. Based on the operation mode and power network parameters of Jixi power grid and the wind power cluster parameters of Mishan wind power station, this paper calculates the 220kV busbar fault of Mishan substation and the 220kV busbar fault of Mishan wind farm. The problems existing in the configuration and setting calculation of current protection are evaluated. After wind power access system, in order to quickly remove the fault of network line, the necessity of installing main protection and backup protection is expounded in detail, and it is pointed out that the traditional microcomputer protection no longer meets the requirements of operation after wind power access. At the same time, the influence of longitudinal protection and backup protection after wind power access is analyzed qualitatively; the additional impedance caused by transition resistance is analyzed qualitatively; and a two-terminal fault location method is proposed based on the analysis. Then, according to the requirements of relay protection configuration and the principle of relay protection setting, the impact of Mishan wind farm connected to Jixi 220kV power grid on relay protection device is evaluated qualitatively. In the case of wind power source state conversion, the forward and negative symmetric and asymmetric faults are discussed in detail, and the actions of each protection at the end of power grid and wind farm are discussed in detail. In view of the current situation of protection configuration of Mishan wind farm, the paper puts forward some problems that should be paid attention to in the process of improving the configuration of protection function and setting calculation when wind power is connected to Jixi 220kV power grid. The topic of the thesis comes from the problem that the production practice pays close attention to. The discussion and solution of these problems can provide some reference basis for the configuration and setting practice of wind power line protection and promote the coordinated development of wind power and power grid in Heilongjiang Province.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614;TM77
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