Micro-source inverter virtual complex impedance power distribution method based on coordinate transformation
A technology of virtual complex impedance and coordinate transformation, applied in the direction of single-network parallel feeding arrangement, etc., can solve problems such as unstable operation of the system
Active Publication Date: 2020-07-21
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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However, the actual line resistance component is affected by the environmental factors in the area and its own temperature. Setting the virtual negative resistance equal to the line resistance will make the system in a critically stable state, especially when the line resistance drift is less than the virtual negative resistance, the system will run at different stable state
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[0020] The invention will be described in further detail below in conjunction with the accompanying drawings.
[0021] The equivalent circuit of the micro-source inverter dual-machine parallel system is as follows: figure 1 Shown, Z L1 =R L1 +X L1 and Z L2 =R L2 +X L2 are the line impedances between inverters DG1, DG2 and the common connection point PCC, respectively. To make the power circulation between each micro-source zero, the output voltage of each micro-source should be as consistent as possible. For each micro-source running in parallel, the PCC point voltage is the same. If the line voltage drop is the same, the output voltage of the micro-source inverter must also be the same. Therefore, the capacity ratio is n 1 : n 2 The configuration principle of the virtual complex impedance parameter of the micro-source inverter is
[0022]
[0023] In the formula, R L is the line resistance component, R V is the resistive component of the introduced virtual impe...
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According to defects that, in traditional virtual impedance control, voltage amplitude drop of a common connection point is easily caused, the control robustness is poor, system instability and the like is caused by line resistance drifting, the invention provides a micro-source inverter virtual complex impedance power distribution method based on coordinate transformation. Accurate decoupling ofpower output of micro-source inverters in parallel operation and matching of equivalent line impedance are realized by introducing a virtual complex impedance control loop, equivalent output impedanceof the parallel inverter is controlled by designing virtual complex impedance, parallel output impedance matching of multiple inverters is realized, and the load power is accurately distributed according to the capacity proportion of the micro-source inverters, so that the power circulation is reduced, the voltage stability of a common connection point is maintained, virtual power decoupling control is realized through coordinate transformation, the stable and reliable operation of the system is ensured, and the power decoupling distribution between the parallel micro-source inverters is realized.
Description
technical field [0001] The invention belongs to the technical field of new energy power systems and micro-grids, and in particular relates to a method for distributing virtual complex impedance power of micro-source inverters based on coordinate transformation. Background technique [0002] In recent years, more and more distributed generation (Distributed Generation, DG) is connected to the traditional power system through power electronic equipment such as grid-connected inverters. , can achieve reasonable load distribution and system redundancy. In the existing parallel operation control technology of multi-micro-source inverters, the non-interconnection control method based on the output droop characteristic of the inverter is the most common. However, there are differences in the equivalent output impedance characteristics of each grid-connected inverter in the micro-grid, and the resulting problems such as power coupling and power circulation directly affect the droop...
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Login to View More IPC IPC(8): H02J3/48H02J3/50
CPCH02J3/48H02J3/50Y02E40/50
Inventor 颜湘武王玲李冬雪
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)