Method and system for extracting positive sequence component and negative sequence component of network voltage
A technology of grid voltage and negative sequence components, which is applied to the phase angle between voltage and current, measuring electrical variables, measuring devices, etc.
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Embodiment 1
[0064] Embodiment 1 of the present invention discloses a method for extracting positive-sequence and negative-sequence components of grid voltage, please refer to figure 1 , the method includes:
[0065] S1: The first phase voltage e of the three-phase grid a , the second phase voltage e b , the third phase voltage e c Converted to the voltage in the two-phase stationary coordinate system: α-phase voltage e α , β-phase voltage e β .
[0066] Among them, when the three-phase grid voltage is unbalanced, the three-phase grid voltage e a 、e b 、e c Converted to the voltage e in the two-phase stationary coordinate system α 、e β .
[0067] S2: respectively for e α 、e β Perform two double-order generalized integral processing to obtain the grid voltage α-axis positive sequence component that does not include the DC component of the grid voltage β-axis positive sequence component α axis negative sequence component and the negative sequence component of the β axis th...
Embodiment 2
[0104] Embodiment 2 of the present invention discloses a system for extracting positive-sequence and negative-sequence components of grid voltage. Please refer to Figure 4 , the system for extracting positive sequence and negative sequence components of grid voltage includes a conversion module 100 , a first calculation module 200 , a second calculation module 300 and a control module 400 .
[0105] The conversion module 100 is used to transform the first phase voltage e of the three-phase grid a , the second phase voltage e b , the third phase voltage e c Converted to the voltage in the two-phase stationary coordinate system: α-phase voltage e α , β-phase voltage e β .
[0106] The first calculation module 200 is used to calculate e α 、e β Perform two double-order generalized integral processing to obtain the grid voltage α-axis positive sequence component that does not include the DC component of the grid voltage β-axis positive sequence component α axis negative ...
Embodiment 3
[0112] The third embodiment verifies the feasibility and correctness of the method and system for extracting positive-sequence and negative-sequence components of grid voltage according to the present invention. Specifically, it is verified through experiments on the grid voltage under different unbalanced conditions.
[0113] Condition 1:
[0114] e a =325cosωt, e b =325cos(ωt-2π / 3), e c =325cos(ωt+2π / 3);
[0115] Condition 2:
[0116] e a =325cosωt, e b =262cos(ωt-2π / 3), e c =262cos(ωt+2π / 3);.
[0117] Condition 3:
[0118] e a =325cosωt, e b =115cos(ωt-2π / 3), e c =115cos(ωt+2π / 3);
[0119] Condition 4:
[0120] e a =325cosωt+e ah , e b =115cos(ωt-2π / 3)+e bh , e c =115cos(ωt+2π / 3)+e ch , where e ah , e bh , e ch They are high-order harmonics including 5th and 7th;
[0121] Condition 5:
[0122] e a =325cosωt+30, e b =115cos(ωt-2π / 3)+30, e c =115cos(ωt+2π / 3)+30.
[0123] Using the method of the present invention to extract the positive sequence co...
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