AC ice-melting device and method for continuously adjustable multi-branch voltage and frequency of distribution network
A technology of voltage frequency and ice melting method, which is applied in the field of AC ice melting devices, can solve the problems of low machine ice melting efficiency, difficult distribution network multi-branch line ice melting, and limited ice melting range, so as to improve the ice melting efficiency , Increase the effect of ice melting function
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Embodiment 1
[0028] The first embodiment of the present invention provides a configuration structure of a variable-frequency AC ice-melting system suitable for flexible substations and continuous adjustment of voltage and frequency. The specific implementation is as follows: figure 1 shown. The premise of the implementation of the present invention is that the B2B-MMC replacement tie switch is installed in the substation, and its common function is power flow regulation. technology. In terms of B2B-MMC access mode, the difference from conventional functions is that a melting ice transformer and ice melting circuit breakers S4 and S5 are connected, so that it can adapt to the complex current situation of multi-branch ice melting in the distribution network. Handle overhead line, branch line or overhead main line. When the AC power with excessive voltage is generated from the ice melting side, the transformer can step down according to the ice melting demand to make the ice melting voltage ...
Embodiment 2
[0030] The second embodiment of the present invention provides a variable-frequency AC ice-melting technology model suitable for multi-branch distribution network and continuous voltage and frequency adjustment. The specific implementation is as follows: figure 2 shown. A control flow of the variable-frequency AC ice-melting technology that is suitable for multi-branch distribution network and continuous voltage and frequency adjustment proposed by the present invention includes the following steps:
[0031] Step 101: determine the online ice melting target route;
[0032] Step 102: close switches S4 and S5, connect to the ice melting system and form an ice melting circuit
[0033] Step 103: B2B-MMC switches to the ice melting mode;
[0034] Step 104: Calculate the current required for melting ice;
[0035] Step 105: Adjust the frequency parameter of the inverter and the transformation ratio of the ice-melting transformer according to the ice-melting current;
[0036] Ste...
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