Method for obtaining transient stability of grid-connected inverter type distributed power supply
An inverter-type distributed, transient stability technology, applied in electrical components, emergency protection circuit devices, single-network parallel feeding arrangements, etc. Insufficient applicability of assessments
Active Publication Date: 2020-06-09
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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[0005] The research on the transient stability of IIDG in the form of simulation is only applicable to a specific IIDG or microgrid, the research is not universal, and it lacks the evaluation method of IIDG transient stability ability, which is difficult to be widely used
However, the study of small disturbance stability does not involve network topology changes. It is not suitable for stability evaluation of large disturbance transient events such as system failure and operation mode switching, and cannot accurately judge the transient stability of IIDG.
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[0023] like Figure 4 As shown, the system of this embodiment includes: a control system parameter input module, a grid connection parameter input module, a system model establishment module, a transient stability iterative calculation module, a stability judgment module and a stability result output module, wherein: the control system parameter The input module is connected with the system model building module and transmits the control system parameter information, the connection grid parameter input module is connected with the system model building module and transmits the connection grid parameters, and the system model building module calculates the IIDG power angle curve and outputs it to the transient stability trajectory iteration The calculation module, the transient stability trajectory iterative calculation module is connected with the stability judgment module and outputs the change trajectory of the power angle and power calculated by the iterative algorithm in th...
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A method for acquiring transient stability of a grid-connected inverter interfaced distributed generator comprises the steps of firstly, calculating an initial output power of the inverter interfaceddistributed generator (IIDG) according to a parameter of a control system of the grid-connected inverter interfaced distributed generator and a parameter of a connection power grid; and secondly, calculating a power angle and a changing track of the output power after a transient event by employing a time domain-based iterative algorithm according to information of the transient event, and judgingthe transient stability of the IIDG according to the power angle at a current moment. By the method, the forecast and the judgment on the transient stability of the grid-connected inverter interfaceddistributed generator can be achieved in an off-line way, a basis is provided for stable running of the distributed generator in a power distribution network, and a stable running condition is provided for dispatching staff and management staff of the power distribution network.
Description
technical field [0001] The invention relates to a technology in the field of power system control, in particular to a method for obtaining transient stability of grid-connected inverter type distributed power supply. Background technique [0002] With the depletion of conventional energy and the deterioration of the global environment, new energy represented by photovoltaics and wind energy has begun to develop rapidly, and the impact of new energy on the power grid cannot be ignored. As an important way of power generation access and consumption of new energy, distributed power generation is receiving widespread attention around the world. Distributed power generation has various structures and flexible working methods, and can efficiently utilize new energy. Since distributed power generation usually belongs to the distribution network layer, short-circuit faults occur frequently, and the distribution network often switches operation modes, such transient events pose a gr...
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IPC IPC(8): H02J3/38H02H7/26H02H7/28
Inventor 余墨多黄文焘邰能灵施金晓宁连营
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO