Load low voltage release characteristic parameter determination method and apparatus
A technology for characteristic parameters and determination methods, applied in circuit devices, electrical digital data processing, special data processing applications, etc., and can solve complex problems
Active Publication Date: 2018-01-19
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology
However, due to the complexity of the load modeling problem, it is still one of the recognized problems in the power system, and there is still a certain distance from the complete solution of the problem. For example, the low-voltage release characteristics and modeling methods for various loads have not been developed in depth. However, the importance of its impact on the safe and stable operation of the power grid and the necessity of research are more prominent with the formation of cross-regional AC-DC hybrid power grids, and it is also the main problem and challenge for load modeling work in the future
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[0089] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0090] Since the power load exhibits the characteristics of low voltage release, it also shows the characteristics of the comprehensive load composed of traditional static load and dynamic load, so in the process of load low voltage release modeling, it is necessary to consider the dynamic load The low-voltage release characteristics of the static load should also be considered. Therefore, based on the load model structure of the SLM (considering the comprehensive load model of the distribution network), some characteristic parameters are introduced to characterize the characteristics of the low-voltage release load. . In the embodiment of the present invention, the structural diagram of the comprehensive load model considering the power distribution network is as follows figure 1 As shown, the voltage threshold value, average delay time constant and ratio o...
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The invention provides a load low voltage release characteristic parameter determination method and apparatus. The method comprises the steps of calculating comprehensive active power of a static loadand comprehensive active power of a dynamic load; according to the comprehensive active power of the static load, determining a low voltage release characteristic parameter of the static load, and according to the comprehensive active power of the dynamic load, determining a low voltage release characteristic parameter of the dynamic load; and according to a ratio of low voltage release of the static load and a ratio of low voltage release of the dynamic load, determining a percentage of the dynamic load after low voltage release. According to the technical scheme provided by the method and the apparatus, the low voltage release characteristics of the loads are considered; the determined low voltage release characteristic parameters of the static load and the dynamic load can further improve simulation precision of a load model, and conform to an actual physical power grid; the influence of load low voltage release on power grid stability and a control policy is considered; and a basis is provided for a safe and stable operation and control decision of a large alternating current and direct current hybrid power grid.
Description
technical field [0001] The invention relates to a safety and stability analysis technology of an electric power system, in particular to a method and a device for determining characteristic parameters of load low-voltage release. Background technique [0002] With the construction and formation of UHV AC-DC hybrid power grid in China, large-scale power flows traverse long distances, and the centralized connection of multiple circuits and large-capacity DC to the power grid at the sending and receiving end has led to prominent problems of voltage stability and frequency stability of the large power grid. The influence of reactive power characteristics and frequency characteristics on the safety and stability characteristics of large power grids (ie, sending-end power grids and receiving-end power grids) has become increasingly prominent, and has a great impact on the safety and stability control of large power grids. Load models are more important in large power grid simulatio...
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Login to View More IPC IPC(8): G06F17/50G06Q50/06H02J3/00
CPCY02E60/00
Inventor 赵兵马士聪黄志龙贺庆曹路王琦庄侃沁刘丽平李建华汪静
Owner CHINA ELECTRIC POWER RES INST