EP0217298A2
Expired / Lapsed
EP
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Self-commutated power converter
Assignee: Toshiba Corp
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Filing: 1986-09-26
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Granted: —
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Expires: 2006-09-26
Abstract
Abstract In a self-commutated power converter, an error signal input (31a) of an error amplifier (33) in an active or reactive power control circuit is detected, and when the detected error signal input (31a) exceeds a predetermined value, a circuit breaker (4), which couples the power converter to an AC power system, is opened Then, any malfuncting ofthe power control system or power fault of the AC power system is detected in accordance with the value of the detection voltage of the AC power system.
Inventors
- 👤 Kiyoshi C/O Patent Division Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 08:00
CPC Classifications
H; H02; H02J; H02J9/00; H02J9/04; H02J9/06; H02J9/062; H02M; H02M7/00; H02M7/66; H02M7/68; H02M7/72; H02M7/75; H02M7/757
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
236 words
A self-commutated power converter coupled, via a circuit breaker, to an AC power system, comprising: power-detection means (32) for detecting an output power of the self-commutated power converter (2, 3), in order to generate a power-detection signal (32a); error signal-generating means (31, 31A) for generating an error signal (31a) representing the difference between said power-detection signal (32a) and a given power reference signal (Paref); output-control means (21-23; 33-36) for controlling the output of the self-commutated power converter (2, 3) according to said error signal (31a); error magnitude-detection means (51-54) for detecting the magnitude of said error signal (31a), and generating a first condition signal (54a) when the magnitude of said error signal (31a) reaches a first predetermined value; voltage-detection means (43) for detecting a voltage (13a) of the AC power system (5), and generating a second condition signal (43a) when the magnitude of said AC power system voltage (13a) reaches a second predetermined value; phase difference-detection means (42) for detecting a phase difference between said AC power system voltage (13a) and a voltage (12a) appearing at a coupling point (CP) of the self-excited power converter (2, 3) and the AC power system (5), and generating a third condition signal (42a) when said phase difference falls within a predetermined range; and breaker-control means (41) for controlling the opening and closing of the circuit breaker (4), according to said first, second, and third condition signals (54a, 43a, 42a).
Claim 2
Dependent Claim
236 words
A self-commutated power converter coupled, via a circuit breaker, to an AC power system, comprising: power-detection means (32) for detecting an output power of the self-commutated power converter (2, 3), in order to generate a power-detection signal (32a); error signal-generating means (31, 31A) for generating an error signal (31a) representing the difference between said power-detection signal (32a) and a given power reference signal (Paref); output-control means (21-23; 33-36) for controlling the output of the self-commutated power converter (2, 3) according to said error signal (31a); error magnitude-detection means (51-54) for detecting the magnitude of said error signal (31a), and generating a first condition signal (54a) when the magnitude of said error signal (31a) reaches a first predetermined value; voltage-detection means (43) for detecting a voltage (13a) of the AC power system (5), and generating a second condition signal (43a) when the magnitude of said AC power system voltage (13a) reaches a second predetermined value; phase difference-detection means (42) for detecting a phase difference between said AC power system voltage (13a) and a voltage (12a) appearing at a coupling point (CP) of the self-excited power converter (2, 3) and the AC power system (5), and generating a third condition signal (42a) when said phase difference falls within a predetermined range; and breaker-control means (41) for controlling the opening and closing of the circuit breaker (4), according to said first, second, and third condition signals (54a, 43a, 42a).
Claim 3
Dependent Claim
115 words
A self-commutated power converter according to claim 1, characterized in that said output-control means (21-23; 33-36) includes: a first error amplifier (33) for amplifying said error signal (31a), and characterized in that said error magnitude-detection means (51-54) includes: a second error amplifier (51) for amplifying said error signal (31a), to provide an amplified error signal (51a); and a signal level-detector (54) for detecting the level of said amplified error signal (51a), and providing said first condition signal (54a) when the level of said amplified error signal (51a) reaches a value corresponding to said first predetermined value, said first predetermined value representing the limit of nonsaturation of an output (33a) from said first error amplifier (33).
Claim 4
Dependent Claim
30 words
A self-commutated power converter according to claim 2, characterized in that the operation speed of said second error amplifier (51) is higher than that of said first error amplifier (33).
Claim 5
Dependent Claim
21 words
A self-commutated power converter according to claim 2, characterized in that said second error amplifier (51) has a finite amplification factor.
Claim 6
Dependent Claim
133 words
A self-commutated power converter coupled, via a circuit breaker, to an AC power system, comprising: means (32) for detecting an output power of the self-commutated power converter (2, 3), in order to generate a power-detection signal (32a); means (31, 31A) for generating an error signal (31a) representing the difference between said power-detection signal (32a) and a given power reference signal (Paref); output-control means (21-23; 33-36) for controlling the output of the self-commutated power converter (2, 3) according to said error signal (31a); error magnitude-detection means (51-54) for detecting the magnitude of said error signal (31a), and generating a condition signal (54a) when the magnitude of said error signal (31a) reaches a predetermined value; and means (41) for controlling the opening and closing of the circuit breaker (4), according to said condition signal (54a).
Claim 7
Dependent Claim
133 words
A self-commutated power converter coupled, via a circuit breaker, to an AC power system, comprising: means (32) for detecting an output power of the self-commutated power converter (2, 3), in order to generate a power-detection signal (32a); means (31, 31A) for generating an error signal (31a) representing the difference between said power-detection signal (32a) and a given power reference signal (Paref); output-control means (21-23; 33-36) for controlling the output of the self-commutated power converter (2, 3) according to said error signal (31a); error magnitude-detection means (51-54) for detecting the magnitude of said error signal (31a), and generating a condition signal (54a) when the magnitude of said error signal (31a) reaches a predetermined value; and means (41) for controlling the opening and closing of the circuit breaker (4), according to said condition signal (54a).
Claim 8
Dependent Claim
112 words
A self-commutated power converter according to claim 5, characterized in that said output-control means (21-23; 33-36) includes: a first error amplifier (33) for amplifying said error signal (31a), and characterized in that said error magnitude-detection means (51-54) includes: a second error amplifier (51) for amplifying said error signal (31a), to provide an amplified error signal (51a); and a signal level-detector (54) for detecting the level of said amplified error signal (51a), and providing said condition signal (54a) when the level of said amplified error signal (51a) reaches a value corresponding to said predetermined value, said predetermined value representing the limit of nonsaturation of an output (33a) from said first error amplifier (33).
Claim 9
Dependent Claim
174 words
A self-commutated power converter coupled, via a circuit breaker, to an AC power system, comprising: means (32) for detecting an output power of the self-commutated power converter (2, 3), in order to generate a power-detection signal (32a); means (31, 31A) for generating an error signal (31a) representing the difference between said power-detection signal (32a) and a given power reference signal (Paref); output-control means (21-23; 33-36) for controlling the output of the self-commutated power converter (2, 3) according to said error signal (31a); error magnitude-detection means (51-54) for detecting the magnitude of said error signal (31a), and generating a first condition signal (54a) when the magnitude of said error signal (31a) reaches a first predetermined value; means (43) for detecting a voltage (13a) of the AC power system (5), and generating a second condition signal (43a) when the magnitude of said AC power system voltage (13a) reaches a second predetermined value; and means (41) for controlling the opening and closing of the circuit breaker (4), according to said first and second condition signals (54a, 43a).
Claim 10
Dependent Claim
174 words
A self-commutated power converter coupled, via a circuit breaker, to an AC power system, comprising: means (32) for detecting an output power of the self-commutated power converter (2, 3), in order to generate a power-detection signal (32a); means (31, 31A) for generating an error signal (31a) representing the difference between said power-detection signal (32a) and a given power reference signal (Paref); output-control means (21-23; 33-36) for controlling the output of the self-commutated power converter (2, 3) according to said error signal (31a); error magnitude-detection means (51-54) for detecting the magnitude of said error signal (31a), and generating a first condition signal (54a) when the magnitude of said error signal (31a) reaches a first predetermined value; means (43) for detecting a voltage (13a) of the AC power system (5), and generating a second condition signal (43a) when the magnitude of said AC power system voltage (13a) reaches a second predetermined value; and means (41) for controlling the opening and closing of the circuit breaker (4), according to said first and second condition signals (54a, 43a).
Claim 11
Dependent Claim
112 words
A self-commutated power converter according to claim 7, characterized in that said output-control means (21-23; 33-36) includes: a first error amplifier (33) for amplifying said error signal (31a), and characterized in that said error magnitude-detection means (51-54) includes: a second error amplifier (51) for amplifying said error signal (31a), to provide an amplified error signal (51a); and a signal level-detector (54) for detecting the level of said amplified error signal (51a), and providing said condition signal (54a) when the level of said amplified error signal (51a) reaches a value corresponding to said predetermined value, said predetermined value representing the limit of nonsaturation of an output (33a) from said first error amplifier (33).
Claim 12
Dependent Claim
197 words
A self-commutated power converter coupled, via a circuit breaker, to an AC power system, comprising: means (32) for detecting an output power of the self-commutated power converter (2, 3), in order to generate a power-detection signal (32a); means (31, 31A) for generating an error signal (31a) representing the difference between said power-detection signal (32a) and a given power reference signal (Paref); output-control means (21-23; 33-36) for controlling the output of the self-commutated power converter (2, 3) according to said error signal (31a); error magnitude-detection means (51-54) for detecting the magnitude of said error signal (31a), and generating an error condition signal (54a) when the magnitude of said error signal (31a) reaches a first prefixed value; means (42) for detecting a phase difference between said AC power system voltage (13a) and a voltage (12a) appearing at a coupling point (CP) of the self-commutated power converter (2, 3) and the AC power system (5), and generating a phase condition signal (42a) when the magnitude of said phase difference reaches a second prefixed value; and means (41) for controlling the opening and closing of the circuit breaker (4), according to said error signal (31a) and said phase condition signal (42a).
Claim 13
Dependent Claim
197 words
A self-commutated power converter coupled, via a circuit breaker, to an AC power system, comprising: means (32) for detecting an output power of the self-commutated power converter (2, 3), in order to generate a power-detection signal (32a); means (31, 31A) for generating an error signal (31a) representing the difference between said power-detection signal (32a) and a given power reference signal (Paref); output-control means (21-23; 33-36) for controlling the output of the self-commutated power converter (2, 3) according to said error signal (31a); error magnitude-detection means (51-54) for detecting the magnitude of said error signal (31a), and generating an error condition signal (54a) when the magnitude of said error signal (31a) reaches a first prefixed value; means (42) for detecting a phase difference between said AC power system voltage (13a) and a voltage (12a) appearing at a coupling point (CP) of the self-commutated power converter (2, 3) and the AC power system (5), and generating a phase condition signal (42a) when the magnitude of said phase difference reaches a second prefixed value; and means (41) for controlling the opening and closing of the circuit breaker (4), according to said error signal (31a) and said phase condition signal (42a).
Claim 14
Dependent Claim
115 words
A self-commutated power converter according to claim 9, characterized in that said output-control means (21-23; 33-36) includes: a first error amplifier (33) for amplifying said error signal (31a), and characterized in that said error magnitude-detection means (51-54) includes: a second error amplifier (51) for amplifying said error signal (31a), to provide an amplified error signal (51a); and a signal level-detector (54) for detecting the level of said amplified error signal (51a), and providing said error condition signal (54a) when the level of said amplified error signal (51a) reaches a value corresponding to said first prefixed value, said first prefixed value representing the limit of nonsaturation of an output (33a) from said first error amplifier (33).
References Cited (Backward Citations)
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