A static synchronous compensator device and control method for a three-phase three-leg distribution network
A technology of static synchronous compensation and power distribution network, applied in circuit devices, reactive power adjustment/elimination/compensation, electrical components, etc. Guaranteed compensation capacity, etc.
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Embodiment 1
[0071] In this embodiment, the device start-up simulation experiment is carried out by using the condition of whether the pre-charging circuit 2 functions. image 3 and Figure 4 in, U sa Indicates the A-phase voltage of the distribution network 9, i a Indicates the A-phase current of the AC side of the power module 4 . use figure 1 The structural circuit in .
[0072] The pre-charging circuit 2 can be divided into four steps during the start-up process of the device connected to the grid:
[0073] Step 1: Precharge the DC side capacitor 11 of the power module 4; the device 1 uses a precharge circuit 2 composed of an uncontrollable rectifier bridge 2-1, a KM1 contactor 2-2, and a current limiting resistor 2-3. The control realizes charging the DC side capacitor 11 of the power module 4 . The specific operation is: close the KM1 contactor 2-2 and KM2 contactor 2-4 in the pre-charging circuit 2, so that the pre-charging circuit 2 can charge the DC side capacitor 11 of the ...
Embodiment 2
[0082] In this embodiment, the reactive current real-time detection and automatic compensation operation of the device 1 of the present invention are described; the reactive current real-time detection process of the device 1 of the present invention is as follows Figure 5 shown.
[0083] The first stage: calculate the reactive current in the load current; collect the load current i through the current transformer la,lb , the reactive current is calculated by coordinate equivalent transformation, but the reactive current at this time contains AC components in addition to DC components.
[0084] The second stage: filter the reactive current to obtain the reactive current command If it is not filtered, it may cause overcompensation, and even inject a large amount of harmonics into the power grid, and the compensation effect is poor. Therefore, it is considered to compensate after filtering.
[0085] The third stage: the device runs with load and performs automatic compensati...
Embodiment 3
[0089] In this embodiment, for the soft start gate valve voltage U of the device of the present invention dc_start and the DC side voltage target command of power module 4 Variable, to ensure that the compensation capability of device 1 is described, the specific implementation is as follows:
[0090] The soft-start gate valve voltage of device 1 and the DC-side voltage target command of power module 4 are both obtained by collecting the voltage signal of distribution network 9 and calculated by data processing unit 3-2. Changed properties;
[0091] The calculation formula of soft start gate valve voltage is:
[0092] u dc_start = K 1 ×V s(peak) (1)
[0093] In the formula, U dc_start Represents the soft-start gate valve voltage of device 1, that is, the DC side voltage value of power module 4 when device 1 starts; V s(peak) Represents the peak value of the 9-phase voltage of the distribution network; K 1 represents user-defined coefficients, but K 1 Generally, the...
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