The geographical distribution of energy resources in China is very uneven, whether it is conventional energy or renewable clean energy. In addition, with the growth of electricity demand, the proportion of the grid in the energy transmission system is increasing, and the continuous growth of load size and cross-regional power flow scale promotes the expansion of the grid size and the increase of the grid complexity. The complexity of power grid security and stability control will be greatly increased and the centralized access of large renewable energy bases will bring new technical problems to the safe operation of power grid. The sending end is connected to a large number of renewable energy sources, such as wind power generation, and the power fluctuation is large. In addition, the UHV DC project is in the early stage of operation, the construction of supporting facilities is weak, and the UHV DC near generators are in a critical state for a long time. At this point, generator stator and rotor overcurrents and other limits may operate when renewable energy power fluctuates, and it is difficult to objectively assess the compatibility of limits and protections due to the wide variation in the implementation principles of limits and protections among different manufacturers. When the system fails or fails, the control system of the generator set will participate in the adjustment to restore the system to a stable operating state. If the control system parameters and protection are not properly coordinated, protection may be caused before the control action, and the generator set will be cut off. The system that has been hit loses more active and reactive power support, and the power system's performance deteriorates. Therefore, it is necessary to study the evaluation indexes of the protection and control of the near area generator set of UHV DC project and the cooperation performance of the grid.

In order to solve the problem of accuracy and applicability of gas turbine simulation modeling, it fully meets the electromechanical transient and medium-and long-term dynamic simulation requirements of large power grids. The technical principle of the gas turbine unit of the existing mainstream manufacturers was analyzed, the technical route of the electromechanical transient modeling of the gas turbine unit was determined, and the modeling method for the whole process dynamic simulation was proposed. Based on the unified model architecture, the simulation of unit characteristics of different mainstream manufacturers was realized through mode selection. The model includes governor, actuator, prime mover and generator. The governor model includes normal operation control and island operation control. There is major control loop, primary frequency modulation control in different modes, temperature control and IGV low limit control in the normal operation control model. Finally, the accuracy and applicability of the proposed model are proved by comparing with the measured data of different power plants.

With the development of energy strategy, the proportion of renewable energy has significantly increased, and the trend of power system electrification is becoming increasingly evident, which has brought about issues such as weakened voltage and frequency support in the power system. In order to solve the problem of frequency and voltage exceeding standards caused by active and reactive power oscillations during strong transient processes such as faults and load changes, it is necessary to introduce new energy storage and reactive power regulation equipment. However, retaining reserve capacity will undoubtedly reduce the hours of effective utilization of renewable energy, thereby reducing its economic benefits. Increasing energy storage of different scales according to actual needs can effectively balance the utilization of renewable energy and electricity production, achieve frequency support for peak shaving or transient processes, and comply with the future technological development direction of renewable energy grids. Among them, mechanical energy storage devices represented by flywheels have the advantage of long service life and are suitable for situations that require frequent adjustment. Energy storage and phase regulation are the most common technical means for renewable energy stations to respond to grid stability. However, the current common technical conditions in power grids are the separation of energy storage and phase regulation equipment, a single function, and a lack of low-cost, functionally integrated integrated equipment, as well as corresponding phase regulation and power control strategies. The condenser with flywheel energy storage integrates mechanical energy storage and phase regulation functions, and has attracted widespread attention from academia and industry. It is one of the important technological development directions to solve the voltage and frequency stability problem in the transient process of renewable energy power systems.

With the continuous expansion of power grid interconnection, the power grid's ability to optimize energy allocation has been greatly improved, and the safe and stable operation of the power system has been brought great pressure. Based on actual modeling, the accuracy of power grid stability analysis is getting higher and higher, and the actual power grid transmission capacity is getting closer and closer to the analysis and calculation limit. As the most important dynamic components, the generator set and its control system must give full play to its basic supporting role in the security and stability of the power grid. However, in recent years, a series of power grid disturbance events related to power plant control and protection defects/function imperfection have occurred, which have brought some hidden dangers and threats to the safe and stable operation of power grid. Generally speaking, on the one hand, the rapid development of power grid construction and the significant increase of transmission capacity have brought great pressure on the safe and stable operation of power system. On the other hand, as the basic support for the safety and stability of the power grid, the control and protection system of the conventional power station is still incompatible with the development of the current power system in many aspects, such as standards, detection methods and testing methods. In the face of these two problems, we need to change from passive to active, and actively study the performance index requirements of power plant control and protection system source network coordination, so as to make technical preparations for the revision and improvement of relevant standards. Research on off-line detection techniques for source and network coordination performance of power plant control and protection systems, implement standards and requirements, and ensure the safety and stability of power grid equipment quality. In addition, the prototype of off-line detection device which can be applied in power plant field is developed and trial-produced, which provides technical support for the popularization of off-line detection technology and the improvement of source network coordination performance of power plant control and protection system.

由于励磁系统动态增益对凸极发电机的动态稳定性有显著影响,为改善电力系统阻尼,需要经常调整该动态增益,进而配置电力系统稳定器(PSS).但是在动态增益对发电机动态稳定的影响方面,存在某些模糊认识.首先,分析了励磁系统动态增益对动态阻尼的影响原理.然后,在典型机组参数和工况下计算分析了励磁系统动态增益对凸极发电机阻尼转矩、阻尼比和励磁系统频率响应特性的影响.在单机无穷大系统、两机系统和实际系统中进行了仿真,计算结果和仿真结果一致.最后,在实验室及工程现场进行了试验,验证了仿真和计算结果的正确性,即励磁系统动态增益越大,凸极发电机动态阻尼越弱.为改善凸极发电机(如水电机组)动态阻尼,应使励磁动态增益在满足相关标准要求的前提下取较小数值,且通过配置相应的PSS进一步提高系统阻尼.

Due to the integration of renewable energy, the maximum output of conventional power plants is reduced, and the change of peak valley difference is no longer periodic. In order to cope with the fluctuation of renewable energy, the system needs to increase the rotating reserve capacity. At present, power supply is mainly thermal power in China. The inflexibility of thermal power switch and the existence of minimum technical output increase the volatility of start-up response to renewable energy, and limit the output of renewable energy in the period of low load and renewable energy. Predicting the output power of renewable energy and reducing the uncertainty of renewable energy fluctuation is one of the effective means to reduce the redundant standby capacity of the system. The increase of reserve capacity is related to the prediction accuracy of output power of renewable energy stations. Therefore, renewable energy power prediction is of great significance to the safe and economic operation of power system. According to the requirements of relevant documents and regulations of the national energy administration, all grid connected renewable energy stations need to establish a renewable energy power prediction system. In this paper, hundreds of renewable energy power forecasting service providers has emerged. However, the performance and prediction accuracy of renewable energy power prediction results are uneven, there is a lack of unified test standards and test platform, and an effective integration mechanism and identification method have not been established. Therefore, it is necessary to establish relevant evaluation mechanisms and provide third-party evaluation services, so as to provide a fair reference for selecting strong renewable energy production scheduling support services. However, different from conventional power supply, renewable energy has random volatility, and large-scale renewable energy grid connection brings challenges to the security, stability and economic operation of power grid.

水轮机调速系统厂家众多,逻辑、型式及模式命名规则多样,不利于技术交流、运行控制及管理.研究了当前主流水轮机调速系统的控制逻辑及模式命名规则,并提出了标准化建议;分析了一次调频与自动发电控制系统主流协调策略的优缺点,提出了"同向叠加,反向闭锁"优化控制逻辑,并结合实例进行了验证测试;分析了一次调频关键参数对水轮机调速系统性能的影响,并针对实际案例给出了参数优化方法;研究了水轮机调速系统建模方法,基于分环节辨识,对调节器控制系统、随动系统、水轮机三大环节建立了精确数学模型,并对整体模型进行了校核验证.水轮机调速系统控制逻辑制定、一次调频参数优化、调速系统仿真建模三者须有机结合,共同保证其性能满足相关标准及源网协调各项技术要求.

In order to obtain the low voltage ride through (LVRT) and high voltage ride through (HVRT) control model parameters of static var generator (SVG) with wide adaptability and high accuracy. A parameter testing and identification method of SVG fault model based on full fault set is proposed. Firstly, the electromechanical simulation model structure of SVG is analyzed, and the parameters to be identified are defined. Then, according to the voltage disturbances of various types and amplitudes that may occur in the operation of SVG, the test fault set is designed, and a comprehensive test is carried out for the package electromagnetic calculation given by the manufacturer. Finally, the fault control model of the manufacturer is obtained according to the test results, and the least square method is identified according to the parameters of PSASP model. The correctness of the test and identification results is verified by time-domain simulation.

为实现调相机的无功优化控制,提出了一种高压直流换流站调相机的自动电压控制(automatic voltage control,AVC)策略.首先分析了调相机励磁控制系统和不同励磁控制模式之间的切换逻辑.针对调相机所在的高压直流换流站及近区电网,AVC主站建立二级电压控制区域,并对该区域实行无功协调控制.根据励磁控制模式之间的切换逻辑和AVC主站调相机控制策略,确定了调相机AVC子站的控制模式以及切换逻辑.通过实时数字仿真器(real time digital simulator,RTDS)动模试验,验证了所提策略的正确性和可实行性.文中提出的AVC控制策略,在电网故障时确保调相机动态无功支撑能力,稳态运行时发挥调相机无功源作用,从而优化区域无功出力,提高区域无功调节水平.

为了分析核电机组核岛蓄热能力及对一次调频的影响,以国内某M310压水堆核电机组为例,对机组蒸汽发生器蓄热量、一次回路蓄热量及温度效应对蓄热的影响进行了理论分析及研究.在此基础上,利用能量守恒原理,建立了一、二次回路及核岛整体能量守恒方程,得到核岛蓄热计算模型,并利用理论方法计算得到蒸汽发生器和一次回路的蓄热系数及蓄热时间常数,同时利用核电配套仿真机仿真结果进行验证.结果 表明:模型计算结果与仿真结果差别较小,满足工程计算的要求;由于温度效应的存在,核电机组具有强大的自稳性,从热量的表现形式上看,核电机组具有强大的蓄热能力,完全能够满足一次调频的能量需求.

Due to the increase of the proportion of nuclear power unit capacity in the power grid, the simulation analysis of the PWR nuclear power unit is increasingly important for power grid stability analysis, which is regarded as one of the important parts of China's nuclear power unit. The original mathematical model of the PWR nuclear power unit is very complex and not suitable for the stable calculation and actual measurement modeling of the power grid. Based on the actual modeling of conventional islands, a simplified simulation model of the nuclear island is proposed in this paper and is conducted the actual modeling test of nuclear islands and conventional islands at the NINGDE Nuclear Power Station and FUQING Nuclear Power Station in Fujian Province. In the load test, the models and parameters of the nuclear reactor control system, temperature control circuit, steam generator, speed control system, actuator, and steam turbine were measured. The nuclear island uses the mathematical model built by MATLAB in conjunction with PSD-BPA software for simulation verification. The simulation results can truly reflect the dynamic characteristics of the nuclear islands and conventional islands of PWR nuclear power units, providing mathematical models and parameters for grid stability calculations, which can be used for dispatching safety and stability calculations.

随着核电在我国能源领域所占比重越来越高,核电机组与系统的交互影响日益引起重视。建立精确的控制系统模型来研究核电机组对电网扰动的动态响应,有利于提高研究电网稳定水平的能力。该文提出一种适用于压水堆核电站机组原动机调节系统的数学模型。通过△w-△δ坐标系,从机理上研究了模型参数对电力系统动态稳定的影响。结果表明:存在一个分界频率将频域分为正阻尼区域和负阻尼区域,该分界频率由原动机调节系统参数确定。通过对核电机组进行现场参数测试和在电力系统分析综合程序上进行仿真试验,验证了原动机及其调节系统模型与参数的准确性,并得出一般性结论。原动机调节系统模型参数对电力系统稳定性有重大影响,对其进行现场实测建模十分必要。提出的原动机调节系统模型及实测建模方法适用于压水堆核电站机组,建立的数学模型可用于电力系统稳定分析计算。

Domestic nuclear power plants generally bear base load, electrical power network less demanding its performance of coordination between the source and power grid, simulation analysis model for pressurized water reactor nuclear power plant and generator's prime mover and governor is also lagging behind. With the rise in domestic PWR nuclear power capacity, it is necessary for PWR nuclear power plant simulation model and its prime mover and governor system for precise adjustment of the study, further analysis of their interaction with the grid, improving the performance of its network source coordination. Based on the " Guide for Modeling and Testing of Generator's Prime Mover and Governor" requirements, the actual modeling for Ningde Nuclear Power Station Unit 1, the test content for governing system of nuclear power, actuator, prime mover and energy supply system, etc. And nuclear power plant load test. Parameters measured for governing systems and actuator, using mathematical models to build Matlab simulation parameters were checked, and the use of PSD-BPA measured parameters for the prime mover and energy supply system were recognized. According to the measured parameter identification, the use of PSD-BPA measured data for the load test Ningde Nuclear Power Unit 1 of the simulation verification, simulation results and experimental data to meet the "Guide for Modeling and Testing of Generator's Prime Mover and Governor" requirements. The simulation results can truly reflect the dynamic load characteristics of the PWR nuclear power plant for power system stability provides a mathematical model and parameter calculation can be used to schedule the security and stability analysis.