CN108363000B - Failure detection method for relay of inverter - Google Patents
Failure detection method for relay of inverter Download PDFInfo
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- CN108363000B CN108363000B CN201810063081.8A CN201810063081A CN108363000B CN 108363000 B CN108363000 B CN 108363000B CN 201810063081 A CN201810063081 A CN 201810063081A CN 108363000 B CN108363000 B CN 108363000B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
Abstract
The invention discloses a failure detection method of an inverter relay, which comprises the following steps: A. sequentially selecting one relay from the other relays except the Nth relay farthest from the power grid side or the load side as a tested relay, so that the relay between the tested relay and the power grid side or the load side is closed, and the relay between the tested relay and the inversion side is opened; B. judging whether the relay to be tested fails or not through the current detected by the current sampling unit which is positioned on the side of the relay to be tested far away from the power grid side or the load side when the relay to be tested is opened or closed; c0: the inverter control circuit generates a detection voltage; C. the other relays are disconnected, and whether the Nth relay fails or not is judged according to the current detected by the current sampling unit, which is positioned on the side, close to the power grid side or the load side, of the Nth relay when the Nth relay is disconnected or closed; steps A and B N-1 were performed. The method can avoid the condition of misjudgment and has no side detection blind spot.
Description
Technical Field
The invention relates to the field of inverter detection, in particular to a failure detection method for a relay of an inverter.
Background
Due to the safety requirements in the conventional inverter, two or more relays need to be connected in series at the side close to the power grid or the load to realize redundant protection, as shown in fig. 1. Before two or more relays are closed, whether the relays are good in function or not needs to be judged so that the closing and opening actions can be realized. After the relay is judged to have no abnormal condition through the relay function, the grid connection or the power output can be continued.
For detecting whether the function of the relay is good or not, detection blind spots or misjudgment conditions exist in existing detection circuits. For example, a wrong wiring, while a relay is normal may also falsify a relay anomaly. Or due to the control circuit, other elements are abnormal, and the relay is normal, the relay is also falsely reported to be abnormal, and the like.
Disclosure of Invention
In view of the above technical problems, an object of the present invention is to provide a failure detection method for an inverter relay.
In order to achieve the purpose, the invention adopts the technical scheme that:
a failure detection method for a relay of an inverter comprises N inverters which are sequentially connected in series from a power grid side or a load side to an inversion side, wherein N is more than or equal to 2, and a current sampling unit and an impedance element are respectively arranged between any two adjacent relays, and is characterized by comprising the following steps:
A. selecting one of the other relays except the Nth relay farthest from the power grid side or the load side as a tested relay, so that the relay between the tested relay and the power grid side or the load side is closed, and the relay between the tested relay and the inversion side is opened;
B. judging whether the relay to be tested fails or not through the current detected by the current sampling unit which is positioned on the side of the relay to be tested far away from the power grid side or the load side when the relay to be tested is opened or closed;
executing the step A and the step B N-1 times, and sequentially judging whether other relays except the Nth relay farthest from the power grid side or the load side fail;
the failure detection method further includes step C0 and step C;
the step C0: the inverter control circuit generates a detection voltage;
and C, performing the step of: and (3) switching off the other relays, and judging whether the Nth relay fails or not through the current detected by the current sampling unit which is positioned on the side of the Nth relay close to the power grid side or the load side when the Nth relay is switched off and switched on.
In some embodiments, step B specifically includes:
b1, switching off the relay to be tested, and detecting the current through a current sampling unit positioned on the side of the relay to be tested, which is far away from the power grid side or the load side; if the current is not detected, judging that the relay to be detected is normally disconnected; if the current is detected, judging that the tested relay is abnormal in disconnection;
b2, closing the relay to be tested, and detecting the current through a current sampling unit positioned on the side of the relay to be tested, which is far away from the power grid side or the load side; if the current is detected, judging that the relay to be detected is normally closed; and if the current is not detected, judging that the detected relay is abnormally closed.
In some embodiments, step C specifically includes:
c1, the Nth relay is switched off, and the current is detected by a current sampling unit which is positioned on the side of the Nth relay close to the power grid side or the load side; if the current is not detected, judging that the Nth relay is normally disconnected; if the current is detected, judging that the Nth relay is abnormal in disconnection;
c2, closing the Nth relay, and detecting the current through a current sampling unit which is positioned on the side of the Nth relay close to the power grid side or the load side; if the current is detected, judging that the Nth relay is normally closed; and if the current is not detected, judging that the Nth relay is closed abnormally.
In some embodiments, the failure detection method further comprises, before step a, the steps of: detecting whether an AC voltage exists through a voltage sampling unit arranged on one side of the 1 st relay close to the power grid side or the load side; if an AC voltage is present, step A is performed.
In some embodiments, the step C0 further includes: detecting the voltage of the Nth relay at the side close to the inversion side, and if the voltage is not detected, judging that the control circuit is abnormal; and C, if the voltage is detected, executing the step C.
In some embodiments, the current sampling unit is connected in series between two adjacent relays, connected in series with one impedance element, and then connected in parallel with the other impedance element.
In some embodiments, the current sampling unit is a hall device or a current transformer.
In some embodiments, the impedance element is a capacitor or a resistor.
In some embodiments, N =2, the 1 st relay and the 2 nd relay are serially connected in series from the grid side or the load side of the inverter, the failure detection method comprising the following steps in sequence:
s1, detecting whether an AC voltage exists through a voltage sampling unit arranged on one side of the 1 st relay close to the power grid side or the load side; if the AC voltage exists, executing the following steps;
s2, switching off the 1 st relay and the 2 nd relay, and detecting current through a current sampling unit positioned between the two relays; if the current is not detected, judging that the 1 st relay is normally disconnected; if the current is detected, judging that the 1 st relay is abnormal in disconnection;
s3, enabling the 1 st relay to be closed and the 2 nd relay to be kept open, and if the current sampling unit detects current, judging that the 1 st relay is normally closed; if the current sampling unit does not detect the current, judging that the 1 st relay is closed abnormally;
s4, the 1 st relay and the 2 nd relay are both switched off, and the control circuit on the inversion side generates the detection voltage;
s5, detecting the voltage of the Nth relay at the side close to the inversion side, and if the voltage is not detected, judging that the inverter control circuit is abnormal; if the voltage is detected, executing the following steps;
s6, if the current sampling unit does not detect the current, judging that the 2 nd relay is normally disconnected; if the current sampling unit detects the current, judging that the 2 nd relay is disconnected abnormally;
s7, enabling the 2 nd relay to be closed, keeping the 1 st relay to be opened, and if the current sampling unit detects current, judging that the 2 nd relay is normally closed; and if the current sampling unit does not detect the current, judging that the 2 nd relay is closed abnormally.
Compared with the prior art, the invention has the following advantages by adopting the scheme:
and comparing the currents of the relays when the relays are opened and closed to respectively judge whether the relays are abnormal in opening and closing, so that the condition of misjudgment can be avoided, and a detection side blind spot does not exist.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a circuit diagram of an inverter according to the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the invention may be more readily understood by those skilled in the art. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment provides a failure detection method of an inverter relay. Fig. 1 shows a circuit diagram of the inverter, which includes an inverter module, an inductor, a control circuit (not shown in the figure), and a plurality of relays, which are connected in series from a grid side or a load side to an inverter side. In this embodiment, a failure detection method of the inverter relay will be described in detail by taking two relays as an example, in which the relay on the right side near the power grid is referred to as a 1 st relay a, and the relay on the left side near the inverter is referred to as a 2 nd relay B.
As shown in fig. 1, a voltage sampling unit 1 is provided at the right side of the 1 st relay a for detecting whether an AC voltage exists; and a voltage sampling unit 2 is arranged on the left side of the 2 nd relay B and used for detecting whether the relay detects the existence of detection voltage. A current sampling unit CT and impedance elements X1, X2 are provided between the two relays a and B for detecting the current. The voltage sampling units 1 and 2 may be voltage sampling circuits or voltage sensors. The current sampling unit CT is an existing current detecting device in the inverter circuit, such as a hall device, and may also be a current transformer. The current sampling unit CT is connected between the two relays A and B, is connected in series with one impedance element X2 and then is connected in parallel with the other impedance element X1, and the impedance elements X1 and X2 are passive or active devices such as capacitors or resistors.
First, in the initial condition, both relays are open. When the 1 st relay A is detected, whether the 1 st relay A fails or not can be judged by comparing the conditions of controlling the 1 st relay A to be opened and closed.
Before the determination, it is first determined whether an AC voltage exists by the voltage sampling unit 1. If yes, executing the following steps:
1) under the condition that the 1 st relay A and the 2 nd relay B are controlled to be disconnected, if the current sampling unit CT does not detect the current, the 1 st relay A can be judged to be normally disconnected. If the current sampling unit CT detects the current, the 1 st relay A can be judged to be in a closed state, and the 1 st relay is abnormal in disconnection.
2) Under the condition that the 1 st relay A is controlled to be closed and the 2 nd relay B is kept to be opened, if the current sampling unit CT detects current, the 1 st relay A can be judged to be in a closed state, and at the moment, the 1 st relay A is normally closed. If the current sampling unit CT does not detect the current, it can be determined that the 1 st relay A is abnormal in disconnection.
Second, in the initial condition, both relays a and B are open. Before detecting the 2 nd relay B, the control circuit is required to generate an alternating current voltage, and whether the system generates the alternating current detection voltage or not is judged through the voltage sampling unit 2.
When the 2 nd relay B is detected, whether the 2 nd relay B fails or not can be judged by comparing the conditions of controlling the 2 nd relay B to be opened and closed.
1) If the voltage sampling unit 2 does not detect the voltage, it can be determined that the control circuit, the power unit or the sampling circuit is abnormal.
2) Under the condition that the 1 st relay A and the 2 nd relay B are controlled to be disconnected, if the current sampling unit CT does not detect the current, the 2 nd relay B can be judged to be normally disconnected. If the current sampling unit CT detects the current, the 2 nd relay B can be judged to be in a closed state, and the 2 nd relay B is in abnormal disconnection.
3) Under the circumstances that 2 nd relay B is closed, 1 st relay A keeps opening, if current is detected to current sampling unit CT, can judge 2 nd relay B be the closure state, and 2 nd relay B is closed normally this moment, if current is not detected to current sampling unit CT, can judge that 2 nd relay B is the disconnection condition, and 2 nd relay B is closed unusually this time.
For the inverter which comprises N relays and N is more than or equal to 3, the N relays are sequentially connected in series along the direction from the power grid side to the load side, and a current sampling unit and an impedance element are respectively arranged between any two adjacent relays. In the failure detection method of the relay, the step of detecting the 1 st to the N-1 st relays is the same as the step one, and the control circuit of the inverter generates an alternating current detection voltage only before the Nth relay is detected. The specific process is as follows:
A. selecting one of the other relays except the Nth relay farthest from the power grid side or the load side as a tested relay, so that the relay between the tested relay and the inversion side is closed, and the relay between the tested relay and the power grid side or the load side is opened;
B. judging whether the relay to be tested fails or not through the current detected by the current sampling unit which is positioned on the side of the relay to be tested far away from the power grid side or the load side when the relay to be tested is opened or closed;
executing step A, B for N-1 times, and sequentially judging whether other relays except the Nth relay close to the load side of the inverter fail;
c0: the inverter control circuit generates an alternating current detection voltage, detects the voltage of the side, close to the inversion side, of the Nth relay, and judges that the inverter control circuit is abnormal if the voltage is not detected; if the voltage is detected, executing the following steps;
C. and (3) switching off the other relays, and judging whether the Nth relay fails or not through the current detected by the current sampling unit which is positioned on the side of the Nth relay close to the power grid side or the load side when the Nth relay is switched off and switched on.
The specific process of the step B refers to the step I, and the specific process of the step C refers to the step II.
As in the case of three relays, in the initial state, all three relays are open;
judging whether the AC voltage on the power grid side exists or not, and under the condition that the AC voltage exists, firstly, detecting whether the 1 st relay is abnormal or not by opening and closing the 1 st relay closest to the power grid side or the load side;
after the detection of the 1 st relay is completed, the 1 st relay is closed, and the detection processes of the 2 nd relay and the 3 rd relay are similar to the detection processes of the relays A and B, and correspond to the detection processes of the two relays, namely:
the 3 rd relay is kept open, and whether the 2 nd relay is abnormal or not is detected by opening and closing the 2 nd relay positioned in the middle;
after the 2 nd relay detects the completion, all break off three relay, the contravariant side produces detection voltage, detects 3 rd relay whether unusual through disconnection, closed 3 rd relay.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are preferred embodiments, which are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (8)
1. A failure detection method of an inverter relay is characterized in that the inverter comprises N relays which are sequentially connected in series from a power grid side or a load side to an inversion side, N is larger than or equal to 2, a current sampling unit and an impedance element are respectively arranged between any two adjacent relays, the two impedance elements are connected in parallel, the current sampling unit is connected in series between the two adjacent relays, is connected in series with one impedance element and then is connected in parallel with the other impedance element, and the failure detection method comprises the following steps:
A. selecting one of the other relays except the Nth relay farthest from the power grid side or the load side as a tested relay, so that the relay between the tested relay and the power grid side or the load side is closed, and the relay between the tested relay and the inversion side is opened;
B. judging whether the relay to be tested fails or not through the current detected by the current sampling unit which is positioned on the side of the relay to be tested far away from the power grid side or the load side when the relay to be tested is opened or closed;
executing the step A and the step B N-1 times, and sequentially judging whether other relays except the Nth relay farthest from the power grid side or the load side fail;
the failure detection method further includes step C0 and step C;
the step C0: the inverter control circuit generates a detection voltage;
and C, performing the step of: and (3) switching off the other relays, and judging whether the Nth relay fails or not through the current detected by the current sampling unit which is positioned on the side of the Nth relay close to the power grid side or the load side when the Nth relay is switched off and switched on.
2. The failure detection method according to claim 1, wherein step B specifically comprises:
b1, switching off the relay to be tested, and detecting the current through a current sampling unit positioned on the side of the relay to be tested, which is far away from the power grid side or the load side; if the current is not detected, judging that the relay to be detected is normally disconnected; if the current is detected, judging that the tested relay is abnormal in disconnection;
b2, closing the relay to be tested, and detecting the current through a current sampling unit positioned on the side of the relay to be tested, which is far away from the power grid side or the load side; if the current is detected, judging that the relay to be detected is normally closed; and if the current is not detected, judging that the detected relay is abnormally closed.
3. The failure detection method according to claim 1, wherein step C specifically comprises:
c1, the Nth relay is switched off, and the current is detected by a current sampling unit which is positioned on the side of the Nth relay close to the power grid side or the load side; if the current is not detected, judging that the Nth relay is normally disconnected; if the current is detected, judging that the Nth relay is abnormal in disconnection;
c2, closing the Nth relay, and detecting the current through a current sampling unit which is positioned on the side of the Nth relay close to the power grid side or the load side; if the current is detected, judging that the Nth relay is normally closed; and if the current is not detected, judging that the Nth relay is closed abnormally.
4. The failure detection method according to claim 1, characterized in that it further comprises, before step a, the steps of: detecting whether an AC voltage exists through a voltage sampling unit arranged on one side of the 1 st relay close to the power grid side or the load side; if an AC voltage is present, step A is performed.
5. The failure detection method according to claim 1, wherein the step C0 further comprises: detecting the voltage of the Nth relay at the side close to the inversion side, and if the voltage is not detected, judging that the control circuit is abnormal; and C, if the voltage is detected, executing the step C.
6. The failure detection method of claim 1, wherein the current sampling unit is a hall device or a current transformer.
7. The failure detection method according to claim 1, wherein the impedance element is a capacitor or a resistor.
8. The failure detection method according to any one of claims 1 to 7, wherein N =2, and the 1 st relay and the 2 nd relay are connected in series in order from the grid side or the load side of the inverter, the failure detection method comprising the steps of:
s1, detecting whether an AC voltage exists through a voltage sampling unit arranged on one side of the 1 st relay close to the power grid side or the load side; if the AC voltage exists, executing the following steps;
s2, switching off the 1 st relay and the 2 nd relay, and detecting current through a current sampling unit positioned between the two relays; if the current is not detected, judging that the 1 st relay is normally disconnected; if the current is detected, judging that the 1 st relay is abnormal in disconnection;
s3, enabling the 1 st relay to be closed and the 2 nd relay to be kept open, and if the current sampling unit detects current, judging that the 1 st relay is normally closed; if the current sampling unit does not detect the current, judging that the 1 st relay is closed abnormally;
s4, the 1 st relay and the 2 nd relay are both switched off, and the control circuit on the inversion side generates the detection voltage;
s5, detecting the voltage of the 2 nd relay close to the inversion side, and if the voltage is not detected, judging that the inverter control circuit is abnormal; if the voltage is detected, executing the following steps;
s6, if the current sampling unit does not detect the current, judging that the 2 nd relay is normally disconnected; if the current sampling unit detects the current, judging that the 2 nd relay is disconnected abnormally;
s7, enabling the 2 nd relay to be closed, keeping the 1 st relay to be opened, and if the current sampling unit detects current, judging that the 2 nd relay is normally closed; and if the current sampling unit does not detect the current, judging that the 2 nd relay is closed abnormally.
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| CN201810063081.8A CN108363000B (en) | 2018-01-23 | 2018-01-23 | Failure detection method for relay of inverter |
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| CN112964981B (en) * | 2021-02-05 | 2023-01-24 | 苏州海鹏科技有限公司 | Three-phase photovoltaic inverter relay fault detection method |
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