Not easily. How much power/current capability does the 3 kV have? What is the pulsation rate? What frequency do you want at 220 volts?
In theory, you can AC couple the 3 kV via a capacitor, into a transformer. But transformers capable of 3 kV are difficult to design and build, even for someone with a lot of transformer design experience.
But if the input frequency is not the same as the output, then your best bet is to use diodes and caps to smooth the 3 kV, and then apply that to a special inverter. But at 3 kV that would be very difficult. Finding transistors and transformers that operate at that voltage is not easy.
In theory, you can AC couple the 3 kV via a capacitor, into a transformer. But transformers capable of 3 kV are difficult to design and build, even for someone with a lot of transformer design experience.
But if the input frequency is not the same as the output, then your best bet is to use diodes and caps to smooth the 3 kV, and then apply that to a special inverter. But at 3 kV that would be very difficult. Finding transistors and transformers that operate at that voltage is not easy.
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The power companies use SCR's (several in series) to switch the high DC voltage into a transformer to convert it to a much lower voltage AC, which is rectified back to DC and then a conventional switching regulator can produce a regulated DC voltage, which is then inverted back up to 220VAC.
If your load can tolerate phase control of the SCR's to produce a regulated "average" AC out, that might work for you.
If your load can tolerate phase control of the SCR's to produce a regulated "average" AC out, that might work for you.
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If you occasionally need 10 or 15 amps at 220 volts ac, your best choice is likely a 3500 watt inverter that accepts up to about 2000 volts dc. Lower voltage may be much less costly and has some other advantages, such as 800 volts dc. These are used for large PV solar panel arrays. You need 60 each 12volt, 12 amp hour sealed lead acid batteries for 800 volts or 222 lithium ion cells at about 3.6 volts each. The lithium ion cells occupy less space, weigh much less, tolerate higher energy pulses and store almost as much energy, but they are much more costly and less forgiving of over charge and excessive discharge. 7 amp hour sealed lead acid batteries are also readily available, but may be almost as costly as the 12 amp-hour batteries. Your battery bank can likely accept up to 15,000 watt, peak pulse, if the on time is 8 milliseconds or less and the duty cycle 50% or less. You could also use about 62 110 amp-hour 12 volt deep cycle lead acid batteries, for 9 times more run time at 220 volts ac. Neil