Island detection method and system
An island detection and coordinate system technology, which is applied in the direction of measuring electricity, measuring devices, and measuring electrical variables, can solve the problems of affecting the quality of inverter output power and large blind areas of island detection, and achieves the elimination of island detection blind areas and steady-state power Good quality, easy to control effects
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Embodiment 1
[0042] The invention provides an island detection method, which is suitable for grid-connected inverters that adopt grid voltage orientation, and the grid-connected inverters have local loads, and the local loads can be pure resistive loads, inductive loads, and capacitive loads. random combination.
[0043] see figure 1 , is a grid-connected inverter topology with local load (RLC), point A is the grid-connected point, and its power equation can be described as:
[0044] P load +jQ load =(P inv +ΔP)+j(Q inv +ΔQ)
[0045] Among them, P load Active power consumed by the local load, Q load Reactive power consumed by local loads, P inv is the active power output by the grid-connected inverter, Q inv is the reactive power output by the grid-connected inverter, ΔP is the active power exchanged between the grid-connected point and the grid, and ΔQ is the reactive power exchanged between the grid-connected point and the grid. When it is zero, that is, the grid-connected invert...
Embodiment 2
[0072] see Figure 7 , the present application also discloses an islanding detection system, the system includes: a sampling module (not shown), used to sample the three-phase voltage and three-phase current signals of the grid-connected point; The three-phase voltage signal U of the outlet a , U b , U c Perform phase locking, and output the angle orientation error value err_q of the grid-connected point voltage; the proportional differential regulator 2 is used to perform proportional differential adjustment on the angle orientation error value err_q to obtain the disturbance amount of the reactive power command of the grid-connected inverter ΔVq; the adder 3 is used to superimpose the disturbance ΔVq of the reactive power command on the reactive current command Iq_ref of the grid-connected inverter; the reactive power control module 4 is used to superimpose the reactive power according to the superimposed disturbance The current command Iq'_ref controls the reactive power...
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