Unified power flow controller adopting modular structure and starting method for unified power flow controller
A power flow controller and modular technology, applied in the direction of power transmission AC network, etc., can solve the problems of limited controllable range, charging of series converters, etc., and achieve the effect of improving device reliability, high reliability, and simple control method
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[0069] Example 1
[0070] Put in the DC current limiting resistor and start the current limit to limit the current after the converter is unlocked when the sub-module is low voltage; the circuit structure is as follows figure 1 Shown
[0071] When the parallel converter makes the capacitor voltage of the sub-module reach the rated value through controllable rectification, the capacitor voltage of the series-side MMC module reaches half of the rated value. At this time, the series-side MMC pulse is unlocked, and the sub-modules are divided into two groups and input. At the same time, a current-limiting resistor is input on the DC side to limit the impact current. The series-side MMC can absorb electric energy through the DC side to charge the module capacitor. When the number of modules invested in each group of each phase of the MMC on the series side is N, the N module capacitors can be charged to the rated voltage. Pass; Two-stage switching and alternate charging methods, and fi...
Example Embodiment
[0076] Example 2
[0077] Input AC current-limiting resistance current-limiting start, the circuit structure is like figure 2 Shown. This scheme omits the DC current limiting resistor and its bypass switch, but it will increase the valve's requirements for voltage and current tolerance. In the uncontrolled rectification stage, a current-limiting resistor is required on the AC side, and this resistor is bypassed after the uncontrolled rectification is over. When the controllable rectification starts, the resistor can be reconnected to limit the inrush current.
[0078] The full charging steps are as follows:
[0079] The parallel converter triggers the pulse unlock, and adopts constant DC voltage control until the AC side charges the capacitor voltage of the parallel converter sub-module to the rated value. At this time, the capacitor voltage of the series converter sub-module is charged to half of the rated value.
[0080] Disconnect the soft-start resistance bypass switch BKRST;
...
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