EP0227014A1
Expired / Lapsed
EP
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Turbine helper drive apparatus
Assignee: Toshiba Corp
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Filing: 1986-12-16
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Granted: —
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Expires: 2006-12-16
Abstract
Abstract A turbine helper drive apparatus has an induction motor (2A) coupled to a turbine (1), and a power converter for power-controlling the motor (2A). Part of the load of the turbine (1) is shared by the motor (2A) in accordance with preset power (Pref) for power control, so that auxiliary drive to compensate for the insufficient capacity of the turbine (1) is performed and cheaper, late-night electric power is effectively utilized.
Inventors
- 👤 Suzuo C/O Patent Div. K.K. Toshiba Saito
- 👤 Teruo C/O Patent Div. K.K. Toshiba Nakagawa
- 👤 Akio C/O Patent Div. K.K. Toshiba Hirata
- 👤 Tadao C/O Patent Div. K.K. Toshiba Mose
- 👤 Kohsaku C/O Patent Div. K.K. Toshiba Ichikawa
- 👤 Kazuto C/O Patent Div. K.K. Toshiba Kawakami
- 👤 Tsugunori C/O Patent Div. K.K. Toshiba Kuga
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 07:34
CPC Classifications
G; G05; G05D; G05D17/00; G05D17/02; H; H02; H02P; H02P25/00; H02P25/02; H02P25/022; H02P25/03; H02P29/00; H02P29/0016
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
104 words
A turbine helper drive apparatus comprising: a turbine (1); a load device (3) mechanically coupled to said turbine (1) and driven thereby; an alternating-current motor (2), mechanically coupled to said load device (3), for driving said load device (3) in cooperation with said turbine (1), to thereby partially share a load of said load device (3); and control means (100) for controlling said alternating-current motor (2) in accordance with a power reference (Pref) that determines a load sharing ratio of said turbine (1) and said alternating-current motor (2), so that a mechanical output from said alternating-current motor (2) corresponds to the power reference (Pref).
Claim 2
Dependent Claim
104 words
A turbine helper drive apparatus comprising: a turbine (1); a load device (3) mechanically coupled to said turbine (1) and driven thereby; an alternating-current motor (2), mechanically coupled to said load device (3), for driving said load device (3) in cooperation with said turbine (1), to thereby partially share a load of said load device (3); and control means (100) for controlling said alternating-current motor (2) in accordance with a power reference (Pref) that determines a load sharing ratio of said turbine (1) and said alternating-current motor (2), so that a mechanical output from said alternating-current motor (2) corresponds to the power reference (Pref).
Claim 3
Dependent Claim
82 words
An apparatus according to claim 1, characterized in that said alternating-current motor (2) is an induction motor (2A), and said control means (100) includes: voltage control means (4, 13, 15, 5, 6) for setting a voltage (Vm) applied to said induction motor (2A) to a predetermined value corresponding to a rotational frequency (N) thereof; and current control means (6 - 12, 14, A1, A2) for changing a current (Im) supplied to said induction motor (2A) in accordance with the power reference (Pref).
Claim 4
Dependent Claim
205 words
An apparatus according to claim 2, characterized in that said current control means (6 - 12, 14, A1, A2) includes: power detecting means (7 - 9) for detecting input power (PM) supplied to said induction motor (2A) and generating a power signal (PB) representing the input power (PM); torque correction means (A1, 10) for detecting a difference (PB - Pref) between the power signal (PB) and the power reference (Pref) and generating a torque correction signal (TAB) corresponding to the difference; torque instruction means (4, 11) for detecting the rotational frequency (N) of said induction motor (2A) and generating a torque instruction signal (TA) representing a ratio of data (fm) of the rotational frequency (N) to the power reference (Pref); frequency reference generating means (12) for adding the torque correction signal (TAB) to the torque instruction signal (TA), so that generating a slip frequency reference (SFA) is generated; and means (A2, 14, 6) for changing a current (Im) to be supplied to said induction motor (2A) based on a frequency signal (fb) obtained by adding the slip frequency reference (SFA or fs) to the rotational frequency data (fm), thereby controlling an output torque of said induction motor (2A) in accordance with the power reference (Pref).
Claim 5
Dependent Claim
83 words
An apparatus according to claim 1, characterized in that said alternating-current motor (2) is an induction motor (2A), and said control means (100) includes: current control means (4, 6, 14, 21, A2) for setting a current (Im) supplied to said induction motor (2A) at a predetermined value corresponding to a rotational frequency (N) thereof; and voltage control means (5 - 11, 13, 15, 22, 23) for changing a voltage (Vm) applied to said induction motor (2A) in accordance with the power reference (Pref).
Claim 6
Dependent Claim
191 words
An apparatus according to claim 4, characterized in that said voltage control means ( 5 - 11, 13, 15, 22, 23) includes: power detecting means (7 - 9) for detecting input power (PM) supplied to said induction motor (2A) and generating a power signal (PB) representing the input power (PM); torque correction means (A1, 10) for detecting a difference (PB - Pref) between the power signal (PB) and the power reference (Pref) and generating a torque correction signal (TAB) corresponding to the difference; torque instruction means (4, 11) for detecting the rotational frequency (N) of said induction motor (2A) and generating a torque instruction signal (TA) representing a ratio of data (fm) of the rotational frequency (N) to the power reference (Pref); voltage reference generating means (22, 23) for adding the torque correction signal (TAB) to the torque instruction signal (TA), so that a voltage reference (VA*) is generated; and means (13, 15, 5, 6) for changing a voltage (Vm) to be applied to said induction motor (2A) based on the voltage reference (VA*), thereby controlling an output torque of said induction motor (2A) in accordance with the power reference (Pref).
Claim 7
Dependent Claim
88 words
An apparatus according to claim 1, characterized in that said alternating-current motor (2) is a synchronous motor (2B), and said control means (100) includes: commutation leading angle control means (31, 34, 35, 6 - 8) for detecting a commutation leading angle (γ0) of said synchronous motor (2B) and setting the commutation leading angle (γ0) at a predetermined value; and current control means (5 - 10, 15, 32, 33, A1, A3) for changing a current (Im) supplied to said synchronous motor (2B) in accordance with the power reference (Pref).
Claim 8
Dependent Claim
190 words
An apparatus according to claim 6, characterized in that said current control means (5 - 10, 15, 32, 33, A1, A2) includes: power detecting means (7 - 9) for detecting input power (PM) supplied to said synchronous motor (2B) and generating a power signal (PB) representing the input power (PM); current correction means (A1, 10) for detecting a difference (PB - Pref) between the power signal (PB) and the power reference (Pref) and generating a current correction signal (TAB) corresponding to the difference; current instruction means (4, 32) for detecting a rotational frequency (N) of said synchronous motor (2A) and generating a current instruction signal (IA*) representing a ratio of data (fm) of the rotational frequency (N) to the power reference (Pref); current reference generating means (A3) for adding the current correction signal (IAB) to the current instruction signal (IA*), so that a current reference (IA) is generated; and means (33, 15, 5, 6) for changing a current (Im) to be supplied to said synchronous motor (2B) based on the current reference (IA), thereby controlling an output torque of said synchronous motor (2B) in accordance with the power reference (Pref).
Claim 9
Dependent Claim
82 words
An apparatus according to claim 1, characterized in that said alternating-current motor (2) is a synchronous motor (2B), and said control means (100) includes: current control means (41, 33, 15, 5, 6) for setting a current (Im) to be supplied to said synchronous motor (2B) at a predetermined value (IA); and commutation leading angle control means (5 - 10, 31, 32, 35, 42) for changing a commutation leading angle (γ0) of said synchronous motor (2B) in accordance with the power reference (Pref).
Claim 10
Dependent Claim
208 words
An apparatus according to claim 8, characterized in that said commutation leading angle control means (5 - 10, 31, 32, 35, 42) includes: power detecting means (7 - 9) for detecting input power (PM) supplied to said synchronous motor (2B) and generating a power signal (PB) representing the input power (PM); current correction means (A1, 10) for detecting a difference (PB - Pref) between the power signal (PB) and the power reference (Pref) and generating a current correction signal (IAB) corresponding to the difference; current instruction means (7, 8, 31, 32) for detecting the commutation leading angle (γ0) of said synchronous motor (2A) and generating a current instruction signal (IA*) representing a ratio of the commutation leading angle (γ0) to the power reference (Pref); commutation leading angle reference generating means (42) for adding the current correction signal (IAB) to the current instruction signal (IA*), so that a commutation leading angle reference (γ) is generated; and means (35, 6) for changing a power factor angle of the input power (PM) to be supplied to said synchronous motor (2A) so that the commutation leading angle (γ0) matches the commutation leading angle reference (γ), thereby controlling an output torque of said synchronous motor (2B) in accordance with the power reference (Pref).
Claim 11
Dependent Claim
81 words
An apparatus according to claim 1, further comprising: turbine load detecting means (50) for detecting the load of said turbine (1) and generating a turbine load signal (PT) representing the detected load; and means (60, 70), responsive to a predetermined load reference (PS) and a difference (PS - PT) between the turbine load (PT) and the load reference (PS), for changing the power reference (Pref) such that the difference (PS - PT) is decreased when the difference (PS - PT) appears.
References Cited (Backward Citations)
US4246528A
Cited
EP0144161A2
Cited
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