Power converting apparatus, heat pump apparatus, and air conditioner

A power converting apparatus comprising:

• a rectifier that rectifies alternating-current power output by an alternating-current power supply;
• a capacitor provided at an output end of the rectifier;
• a reactor provided on a path from the alternating-current power supply to the capacitor;
• a load connected across the capacitor, wherein power output by the load comprises an alternating-current component and a direct-current component;
• and
• a controller that reduces a charging and discharging current of the capacitor by controlling an operation state of the load such that power pulsation is caused in power to be consumed by the load, power pulsation in power to be consumed by the load being characterized by the alternating-current component of the power output by the load,
• wherein
• a range of an inductance value of the reactor to enable reducing the charging and discharging current of the capacitor is defined by using a maximum value of an output voltage of the rectifier, a minimum value of the output voltage of the rectifier, the direct-current component of the power output by the load, a number of phases of the alternating-current power supply, and an angular frequency of the alternating-current power supply,
• the range of the inductance value of the reactor is further defined by use of a pulsating quantity and a ripple tolerance of the capacitor, the pulsating quantity corresponding to a ripple current of the capacitor to be obtained when the output power of the load is not pulsated,
• the inductance value of the reactor is expressed by following formulas:
• L
• =
• V
• max
• 2
• -
• V
• min
• 2
• 4
• ⁢
• P
• out
• ⁢
• _
• ⁢
• dc
• ⁢
• αβ
• (
• 2
• ⁢
• P
• )
• ⁢
• ω
• Formula
• ⁢
• 1
• and
• I
• r
• ⁢
• 0
• -
• I
• r
• ⁢
• _
• ⁢
• lim
• I
• r
• ⁢
• 0
• ≤
• αβ
• ≤
• 10
• Formula
• ⁢
• 2
• where L is the inductance value of the reactor, Vmax is the maximum value of the output voltage of the rectifier, Vmin is the minimum value of the output voltage of the rectifier, Pout_dc is the direct-current component of the output power of the load, P is the number of phases of the alternating-current power supply, ω is the angular frequency of the alternating-current power supply, Ir0 is a ripple current value of the capacitor corresponding to the pulsating quantity to be obtained when the output power of the load is not pulsated, Ir_lim is the ripple tolerance of the capacitor, and αβ is a coefficient based on a load pulsation allowable value and the ripple tolerance of the capacitor.