EP0310048A2
Expired / Lapsed
EP
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Inverter apparatus for system interconnection
Assignee: Toshiba Corp
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Filing: 1988-09-28
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Granted: —
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Expires: 2008-09-28
Abstract
Abstract In a system interconnecting inverter apparatus, an inverter (1, 2, 7 - 17) for controlling power of an AC power system (5, 20) is coupled, via a coupling reactor (X), to the AC power system (5, 20) having a system voltage (Vs). A system phase signal (E23) indicating the phase of the system voltage (Vs) is detected by a system phase detection circuit (23, PT2) in real time. Another phase signal (Es) indicating the phase of the system voltage (Vs) is detected by a comparison phase detection circuit (21) with a predetermined delay time, and the detection result is temporarily stored in the circuit (21) as a comparison phase signal (E21). The system phase signal (E23) and the comparison phase signal (E21) are phase-compared by a stop circuit (22, 100). When a phase difference between the system phase signal (E23) and the comparison phase signal (E21) exceeds a predetermined value, the stop circuit (22, 100) stops the operation of the inverter (1, 2, 7 - 17).
Inventors
- 👤 Nagataka Seki
- 👤 Kiyoshi Ogawa
- 👤 Kihei Nakajima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 16:04
CPC Classifications
H; H02; H02M; H02M7/00; H02J; H02J3/00; H02J3/38; H02J3/46; H02J3/466
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
189 words
A system interconnecting inverter apparatus comprising: an inverter (1, 2, 7 - 17), coupled to an AC power system (5, 20) having a system voltage (Vs), via a coupling reactor (X), for controlling power of said AC power system (5, 20); system phase detection means (23, PT2) for detecting a system phase signal (E23) indicating a phase of the system voltage (Vs) of said AC power system (5, 20) in real time; comparison phase detection means (21) for detecting a signal (Es) indicating the phase of the system voltage of said AC power system (5, 20) with a predetermined delay time, and temporarily storing a result of the detection to provide a comparison phase signal (E21); and stop means (22, 100), coupled to said inverter (1, 2, 7 - 17), said system phase detection means (23, PT2), and said comparison phase detection means (21), for phase-comparing the system phase signal (E23) and the comparison phase signal (E21) and, when a phase difference between the system phase signal (E23) and the comparison phase signal (E21) exceeds a predetermined value, stopping the operation of said inverter (1, 2, 7 - 17).
Claim 2
Independent Claim
189 words
A system interconnecting inverter apparatus comprising: an inverter (1, 2, 7 - 17), coupled to an AC power system (5, 20) having a system voltage (Vs), via a coupling reactor (X), for controlling power of said AC power system (5, 20); system phase detection means (23, PT2) for detecting a system phase signal (E23) indicating a phase of the system voltage (Vs) of said AC power system (5, 20) in real time; comparison phase detection means (21) for detecting a signal (Es) indicating the phase of the system voltage of said AC power system (5, 20) with a predetermined delay time, and temporarily storing a result of the detection to provide a comparison phase signal (E21); and stop means (22, 100), coupled to said inverter (1, 2, 7 - 17), said system phase detection means (23, PT2), and said comparison phase detection means (21), for phase-comparing the system phase signal (E23) and the comparison phase signal (E21) and, when a phase difference between the system phase signal (E23) and the comparison phase signal (E21) exceeds a predetermined value, stopping the operation of said inverter (1, 2, 7 - 17).
Claim 3
Dependent Claim
47 words
An apparatus according to claim 1, characterized in that said system phase detection means (23, PT2) includes means (23) for detecting the phase of the phase signal (Es) which is substantially in-phase with the system voltage (Vs) in real time, and outputting the system phase signal (E23).
Claim 4
Dependent Claim
58 words
An apparatus according to claim 1 or 2, characterized in that said comparison phase detection means (21) includes means (21 in Fig. 1) for detecting a phase of the phase signal (Es) which is substantially in-phase with the system voltage (Vs) of said AC power system (5, 20) in real time, and outputting the comparison phase signal (E21).
Claim 5
Dependent Claim
60 words
An apparatus according to claim 1 or 2, characterized in that said comparison phase detection means (21) includes means (21 in Fig. 4) for detecting a phase of the phase signal (Es) having a phase difference with respect to the system voltage (Vs) of said AC power system (5, 20) in real time and outputting the comparison phase signal (E21).
Claim 6
Dependent Claim
38 words
An apparatus according to claim 3 or 4, characterized in that the phase of the phase signal (Es) corresponds to a phase of a firing pulse of a switching element constituting said inverter (1, 2, 7 - 17).
Claim 7
Independent Claim
95 words
An apparatus according to any one of claims 1 to 5, characterized in that said stop means (22, 100) includes: phase comparison means (102) for outputting a first signal (E102) indicating a phase difference between the phase signal (Es) and the comparison phase signal (E21); integrating means (103) for integrating the first signal (E102) with a predetermined time constant, and outputting a second signal (E103) indicating the integration result; and signal generating means (104, 105) for outputting the comparison phase signal (E21) having a frequency corresponding to a signal level of the second signal (E103).
Claim 8
Dependent Claim
46 words
An apparatus according to claim 6, characterized in that said stop means (22, 100) includes: means (106), coupled to said signal generating means (104, 105), for adjusting the signal phase of the comparison phase signal (E21) independently of the signal level of the second signal (E103).
Claim 9
Independent Claim
43 words
An apparatus according to any one of claims 1 to 7, characterized in that said inverter (1, 2, 7 - 17) includes a PWM inverter (2) which is operated in response to a predetermined phase reference (ϑI*) and a predetermined voltage reference (VI*).
Claim 10
Independent Claim
57 words
An apparatus according to any one of claims 1 to 7, characterized in that said inverter (1, 2, 7 - 17) includes: a non-PWM inverter which is operated in response to a predetermined phase reference (ϑI*); and means (3), responsive to a predetermined voltage reference (VI*), for controlling a DC input voltage to said non-PWM inverter (2).
References Cited (Backward Citations)
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