Superconductive rotating electric machine drive control system and superconductive rotating electric machine drive control method

A superconductive rotating electric machine drive control system comprising:

• a synchronous rotating electric machine that has a superconductive field winding and a copper armature winding or a superconductive armature winding;
• a power unit provided as a power supply unit that supplies power to the synchronous rotating electric machine or as a load unit that receives power from the synchronous rotating electric machine;
• an armature-side power converting device that converts electric power exchanged between the synchronous rotating electric machine and the power unit;
• a field power supply that supplies a field current to the synchronous rotating electric machine;
• a field-side power converting device that controls the current supplied from the field power supply to the superconductive field winding;
• an unified controller that coordinately controls a direct or alternating current flowing in the superconductive field winding and the copper armature winding or superconductive armature winding;
• and
• a refrigerating unit that cools down the superconductive field winding or both the superconductive field winding and the superconductive armature winding to a very low temperature,
• wherein, when the synchronous rotating electric machine is used as a synchronous motor, the unified controller performs a control operation so that field currents If1 and If2 respectively applied to a field winding of the power supply unit and the superconductive field winding of the synchronous rotating electric machine satisfy the following equations (11) and (12) in accordance with a variation of the electric power exchanged between the synchronous rotating electric machine and the power unit:
• If2=E2/k4n2ν=√{square root over ((Vt cos θ−r2I)2+(Vt sin
• θ−x2I)2)}{square root over ((Vt cos θ−r2I)2+(Vt sin
• θ−x2I)2)}/k4n2ν (11)
• If1=E1/k3n1ν=√{square root over ((Vt cos θ+r2I)2+(Vt sin
• θ+x2I)2)}{square root over ((Vt cos θ+r2I)2+(Vt sin
• θ+x2I)2)}/k3n1ν (12)
• where If1 and If2 represent the field currents respectively applied to the field winding of the power supply unit and the superconductive field winding of the synchronous rotating electric machine, I represents a line current, E1 and E2 represent induced electromotive forces of the power supply unit and the synchronous rotating electric machine, Vt represents a terminal voltage, k3 and k4 represent constants, n1 and n2 represent numbers of winding wires in the field winding of the power supply unit and the superconductive field winding of the synchronous rotating electric machine, ν represents a rotation speed of the synchronous rotating electric machine, θ represents a power factor angle, r1 and r2 respectively represent resistance of the power supply unit and resistance of the synchronous rotating electric machine, and χ1 and χ2 respectively represent reactance of the power supply unit and reactance of the synchronous rotating electric machine.

A superconductive rotating electric machine drive control system comprising:

• a synchronous rotating electric machine that has a superconductive field winding and a copper armature winding or a superconductive armature winding;
• a power unit provided as a power supply unit that supplies power to the synchronous rotating electric machine or as a load unit that receives power from the synchronous rotating electric machine;
• an armature-side power converting device that converts electric power exchanged between the synchronous rotating electric machine and the power unit;
• a field power supply that supplies a field current to the synchronous rotating electric machine;
• a field-side power converting device that controls the current supplied from the field power supply to the superconductive field winding;
• an unified controller that coordinately controls a direct or alternating current flowing in the superconductive field winding and the copper armature winding or superconductive armature winding;
• and
• a refrigerating unit that cools down the superconductive field winding or both the superconductive field winding and the superconductive armature winding to a very low temperature,
• wherein, when the synchronous rotating electric machine is used as a power generator, the unified controller performs a control operation so that a field current If2 applied to the superconductive field winding satisfies the following equation (20) in accordance with a variation of the electric power exchanged between the synchronous rotating electric machine and the power unit:
• If2=√{square root over ((Vt cos θ+2I)2+(Vt sin θ+x2I)2)}{square root over ((Vt cos θ+2I)2+(Vt sin θ+x2I)2)}/ k4n2ν (20)
• where If2 represents the field current applied to the superconductive field winding, I represents a line current, Vt represents a terminal voltage, k4 represents a constant, n2 represents a number of winding wires in the superconductive field winding, ν represents a rotation speed of the synchronous rotating electric machine, θ represents a power factor angle, r2 represents resistance of the synchronous rotating electric machine, and χ2 represent reactance of the synchronous rotating electric machine.

A superconductive rotating electric machine drive control method that is implemented in a superconductive rotating electric machine drive control system, the superconductive rotating electric machine drive control system including:

• a synchronous rotating electric machine that has a superconductive field winding and a copper armature winding or a superconductive armature winding;
• a power unit provided as a power supply unit that supplies power to the synchronous rotating electric machine or as a load unit that receives power from the synchronous rotating electric machine;
• an armature-side power converting device that converts electric power exchanged between the synchronous rotating electric machine and the power unit;
• a field power supply that supplies a field current to the synchronous rotating electric machine;
• a field-side power converting device that controls the current supplied from the field power supply to the superconductive field winding;
• an unified controller that coordinately controls a direct or alternating current flowing in the superconductive field winding and the copper armature winding or superconductive armature winding;
• and
• a refrigerating unit that cools down the superconductive field winding or both the superconductive field winding and the superconductive armature winding to a very low temperature,
• the superconductive rotating electric machine drive control method comprising:
• performing a control operation with the use of the unified controller, when the synchronous rotating electric machine is used as a synchronous motor, so that a field current If2 applied to the superconductive field winding of the synchronous rotating electric machine satisfies the following equation (11) in accordance with a variation of the electric power exchanged between the synchronous rotating electric machine and the power unit:
• If2=E2/k4n2ν=√{square root over ((Vt cos θ−r2I)2+(Vt sin
• θ−x2I)2)}{square root over ((Vt cos θ−r2I)2+(Vt sin
• θ−x2I)2)}/k4n2ν (11)
• where If2 represents the field current applied to the superconductive field winding, I represents a line current, E2 represents an induced electromotive force of the synchronous rotating electric machine, Vt represents a terminal voltage, k4 represents a constant, n2 represents a number of winding wires in the superconductive field winding, ν represents a rotation speed of the synchronous rotating electric machine, θ represents a power factor angle, r2 represents resistance of the synchronous rotating electric machine, and χ2 represent reactance of the synchronous rotating electric machine.

A superconductive rotating electric machine drive control method that is implemented in a superconductive rotating electric machine drive control system, the superconductive rotating electric machine drive control system including:

• a synchronous rotating electric machine that has a superconductive field winding and a copper armature winding or a superconductive armature winding;
• a power unit provided as a power supply unit that supplies power to the synchronous rotating electric machine or as a load unit that receives power from the synchronous rotating electric machine;
• an armature-side power converting device that converts electric power exchanged between the synchronous rotating electric machine and the power unit;
• a field power supply that supplies a field current to the synchronous rotating electric machine;
• a field-side power converting device that controls the current supplied from the field power supply to the superconductive field winding;
• an unified controller that coordinately controls a direct or alternating current flowing in the superconductive field winding and the copper armature winding or superconductive armature winding;
• and
• a refrigerating unit that cools down the superconductive field winding or both the superconductive field winding and the superconductive armature winding to a very low temperature,
• the superconductive rotating electric machine drive control method comprising:
• performing a control operation with the use of the unified controller, when the synchronous rotating electric machine is used as a synchronous motor, so that field currents If1 and If2 respectively applied to a field winding of the power supply unit and the superconductive field winding of the synchronous rotating electric machine satisfy the following equations (11) and (12) in accordance with a variation of the electric power exchanged between the synchronous rotating electric machine and the power unit:
• If2=E2/k4n2ν=√{square root over ((Vt cos θ−r2I)2+(Vt sin
• θ−x2I)2)}{square root over ((Vt cos θ−r2I)2+(Vt sin
• θ−x2I)2)}/k4n2ν (11)
• If1=E1/k3n1ν=√{square root over ((Vt cos θ+r2I)2+(Vt sin
• θ+x2I)2)}{square root over ((Vt cos θ+r2I)2+(Vt sin
• θ+x2I)2)}/k3n1ν (12)
• where If1 and If2 represent the field currents respectively applied to the field winding of the power supply unit and the superconductive field winding the synchronous rotating electric machine, I represents a line current, E1 and E2 represent induced electromotive forces of the power supply unit and the synchronous rotating electric machine, Vt represents a terminal voltage, k3 and k4 represent constants, n1 and n2 represent numbers of winding wires in the field winding of the power supply unit and the superconductive field winding of the synchronous rotating electric machine, ν represents a rotation speed of the synchronous rotating electric machine, θ represents a power factor angle, r1 and r2 respectively represent resistance of the power supply unit and resistance of the synchronous rotating electric machine, and χ1 and χ2 respectively represent reactance of the power supply unit and reactance of the synchronous rotating electric machine.

A superconductive rotating electric machine drive control method that is implemented in a superconductive rotating electric machine drive control system, the superconductive rotating electric machine drive control system including:

• a synchronous rotating electric machine that has a superconductive field winding and a copper armature winding or a superconductive armature winding;
• a power unit provided as a power supply unit that supplies power to the synchronous rotating electric machine or as a load unit that receives power from the synchronous rotating electric machine;
• an armature-side power converting device that converts electric power exchanged between the synchronous rotating electric machine and the power unit;
• a field power supply that supplies a field current to the synchronous rotating electric machine;
• a field-side power converting device that controls the current supplied from the field power supply to the superconductive field winding;
• an unified controller that coordinately controls a direct or alternating current flowing in the superconductive field winding and the copper armature winding or superconductive armature winding;
• and
• a refrigerating unit that cools down the superconductive field winding or both the superconductive field winding and the superconductive armature winding to a very low temperature,
• the superconductive rotating electric machine drive control method comprising:
• performing a control operation with the use of the unified controller, when the synchronous rotating electric machine is used as a power generator, so that a field current If2 applied to the superconductive field winding satisfies the following equation (20) in accordance with a variation of the electric power exchanged between the synchronous rotating electric machine and the power unit:
• If2=√{square root over ((Vt cos θ+2I)2+(Vt sin θ+x2I)2)}{square root over ((Vt cos θ+2I)2+(Vt sin θ+x2I)2)}/ k4n2ν (20)
• where If2 represents the field current applied to the superconductive field winding, I represents a line current, Vt represents a terminal voltage, k4 represents a constant, n2 represents a number of winding wires in the superconductive field winding, ν represents a rotation speed of the synchronous rotating electric machine, θ represents a power factor angle, r2 represents resistance of the synchronous rotating electric machine, and χ2 represent reactance of the synchronous rotating electric machine.