CN110829482A - Integrated medium-voltage photovoltaic grid-connected system and interlocking control device thereof - Google Patents
Integrated medium-voltage photovoltaic grid-connected system and interlocking control device thereof Download PDFInfo
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- CN110829482A CN110829482A CN201810888839.1A CN201810888839A CN110829482A CN 110829482 A CN110829482 A CN 110829482A CN 201810888839 A CN201810888839 A CN 201810888839A CN 110829482 A CN110829482 A CN 110829482A
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Abstract
The interlocking control device comprises an inverter emergency stop device, a medium-voltage cabinet emergency stop device and a key exchange box, wherein the inverter emergency stop device is used for controlling connection between each inverter and a transformer in the integrated medium-voltage photovoltaic grid-connected system to be disconnected according to a received inversion emergency stop signal and unlocking a door lock key of an inverter room; the medium-voltage cabinet emergency stop device is used for controlling the disconnection between the medium-voltage protection device and the transformer according to the received output emergency stop signal and releasing the locking of a door lock key of a medium-voltage cabinet chamber; the key exchange box is used for unlocking the lock key of the door lock of the transformer chamber in the integrated medium-voltage photovoltaic grid-connected system under the condition that the lock key of the door lock of the inverter chamber and the lock key of the door lock of the medium-voltage chamber are locked.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to an integrated medium-voltage photovoltaic grid-connected system and an interlocking control device thereof.
Background
For a large-scale photovoltaic power station or a distributed grid-connected power generation system, the electrical structure of the system is generally as shown in fig. 1, and the system comprises a discrete inverter chamber, a transformer chamber and a medium-voltage ring main unit chamber. If the door lock of each chamber adopts a simple padlock or a cabinet lock scheme, namely, each chamber is provided with a set of independent lock, the opening and closing of each chamber have no logical interlocking relationship, and the safety of maintenance operation cannot be ensured.
Therefore, in order to ensure the safety of the maintenance operation of the system, it is generally required that each device in the system has a complete interlock design. In the prior art, as shown in fig. 2, each inverter key 10 can be obtained only when the ac/dc switch of each inverter 3 is in the off position; the method comprises the following steps that each inverter key 10 is placed in a key exchange box 20, and then a key 30 of a medium-voltage ring main unit chamber can be obtained; the key 30 of the medium-voltage ring main unit chamber is used for unlocking an installation padlock on a medium-voltage ring main unit switch, then the transformer key 40 is twisted to the position where the medium-voltage switch is disconnected, the transformer key 40 is pulled out and used for unlocking a transformer chamber door lock, and then the transformer chamber can be accessed for operation; through the complete mechanical interlocking scheme, the safety guarantee of the maintenance operation can be realized.
However, in the prior art of the above purely mechanical interlocking scheme, the ac/dc switch of the inverter needs to be customized in combination with the related lock, a padlock needs to be installed in a matching manner on the medium-voltage ring main unit switch, and many hardware need to be customized and designed, and the requirement on the quality of devices is high based on reliability, which results in high scheme cost; moreover, the design of the scheme is complex, so that the actual operation process is too complicated.
Disclosure of Invention
In view of this, the invention provides an integrated medium-voltage photovoltaic grid-connected system and an interlocking control device thereof, so as to solve the problems of high cost and complex operation in the prior art.
In order to achieve the above purpose, the technical solutions provided by the embodiments of the present invention are as follows:
the invention provides an interlocking control device of an integrated medium-voltage photovoltaic grid-connected system, which comprises: the system comprises an inverter emergency stop device, a medium-voltage cabinet emergency stop device and a key exchange box; wherein:
the inverter emergency stop device is used for controlling the connection between each inverter and the transformer in the integrated medium-voltage photovoltaic grid-connected system to be disconnected according to the received inverter emergency stop signal and then releasing the locking of a door lock key of the inverter room;
the medium-voltage cabinet emergency stop device is used for controlling the connection disconnection between the medium-voltage protection device and the transformer in the integrated medium-voltage photovoltaic grid-connected system according to the received output emergency stop signal and then releasing the locking of a medium-voltage cabinet chamber door lock key;
the key exchange box is used for unlocking the lock key of the transformer chamber door in the integrated medium-voltage photovoltaic grid-connected system under the condition that the lock key of the inverter chamber door and the lock key of the medium-voltage cabinet chamber door are locked.
Optionally, the inverter emergency stop device includes: the device comprises n direct-current side switch control circuits, n alternating-current side switch control circuits and a first locking device; wherein:
n is the number of inverters in the integrated medium-voltage photovoltaic grid-connected system, and n is more than or equal to 1;
the direct current side switch control circuit is used for controlling the direct current side of the connected inverter to be switched on or off according to the inversion emergency stop signal;
the alternating current side switch control circuit is used for controlling the alternating current side of the connected inverter to be switched on and off according to the inversion emergency stop signal;
the first locking device is used for unlocking the lock key of the door of the inverter chamber when the direct current side switch and the alternating current side switch of all the inverters are turned off.
Optionally, the inverter emergency stop device further includes:
and the inverter emergency stop button is used for generating and outputting the inverter emergency stop signal when being pressed.
Optionally, the dc side switch and the ac side switch are both circuit breakers;
the DC side switch control circuit and the AC side switch control circuit both include: a controllable switch; the controllable switch and the shunt coil of the corresponding circuit breaker are connected in series between a power supply and the ground, and the control end of the controllable switch receives the inversion emergency stop signal.
Optionally, the first locking device comprises: a switch state monitoring circuit and a locking device;
the switch state monitoring circuit is used for detecting whether the direct current side switches and the alternating current side switches of all the inverters are disconnected or not, and generating and outputting a first unlocking signal under the condition that the direct current side switches and the alternating current side switches of all the inverters are disconnected;
the locking device is used for unlocking the lock key of the door of the inverter chamber according to the first unlocking signal.
Optionally, the medium-voltage cabinet emergency stop device includes: a medium voltage switch control circuit and a second locking device; wherein:
the medium-voltage switch control circuit is used for controlling a medium-voltage switch in the medium-voltage protection device to be switched off according to the output emergency stop signal;
the second locking device is used for unlocking the key of the door lock of the medium voltage cabinet chamber under the condition that the medium voltage switch is disconnected.
Optionally, the medium-voltage cabinet emergency stop device further includes:
and the middle cabinet emergency stop button is used for generating and outputting the output emergency stop signal when being pressed.
Optionally, the medium voltage switch is a circuit breaker;
the medium voltage switch control circuit comprises: a controllable switch; the controllable switch and the shunt coil of the corresponding circuit breaker are connected in series between a power supply and the ground, and the control end of the controllable switch receives the output emergency stop signal.
Optionally, the second locking device includes: a switch state monitoring circuit and a locking device;
the switch state monitoring circuit is used for detecting whether the medium-voltage switch is disconnected or not, and generating and outputting a second unlocking signal under the condition that the medium-voltage switch is disconnected;
the locking device is used for unlocking the lock key of the middle pressure cabinet chamber door according to the second unlocking signal.
An integrated medium voltage grid-connected photovoltaic system comprising: the system comprises an inverter chamber, a transformer chamber, a medium-voltage cabinet chamber and an interlocking control device of the integrated medium-voltage photovoltaic grid-connected system, wherein the inverter chamber, the transformer chamber, the medium-voltage cabinet chamber and the interlocking control device are arranged in the transformer chamber;
the inverter chamber, the transformer chamber and the medium-voltage cabinet chamber are integrally arranged in the same box body.
The application provides an interlocking control device of an integrated medium-voltage photovoltaic grid-connected system, which disconnects each inverter and a transformer in the integrated medium-voltage photovoltaic grid-connected system and the connection between the transformer and a medium-voltage protection device in an electrical control mode; the manual disconnection process of each switch in the prior art is replaced, and the problem of complex operation is avoided. Then, under the condition that the corresponding connection is disconnected, the locking of a door lock key of the inverter room or a door lock key of the medium-voltage cabinet room is released; and furthermore, the high-requirement customization on various hardware in the prior art is avoided in an electric interlocking mode, and the cost is reduced. After the door lock key of the inverter chamber and the door lock key of the medium-voltage chamber can be taken out, the door lock keys are locked by the key exchange box, and the locking of the door lock keys of the transformer chamber in the integrated medium-voltage photovoltaic grid-connected system is released in a mechanical interlocking mode; and then can be under the condition that the transformer both sides are connected and all break off, open the lock of transformer room through this transformer room door lock key, get into the transformer room and maintain the operation, guaranteed the security of maintaining the operation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic block diagram of an integrated medium-voltage photovoltaic grid-connected system provided in the prior art;
fig. 2 is a schematic block diagram of an integrated medium-voltage photovoltaic grid-connected system provided in the prior art for implementing mechanical interlocking;
fig. 3 is a schematic structural diagram of an interlock control device of an integrated medium-voltage photovoltaic grid-connected system according to an embodiment of the present application;
fig. 4 is an electrical wiring schematic diagram of an inverter scram device in an interlock control device of an integrated medium voltage photovoltaic grid-connected system according to another embodiment of the present application;
fig. 5 is an electrical wiring schematic diagram of a medium voltage cabinet scram device in an interlock control device of an integrated medium voltage photovoltaic grid-connected system according to another embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The interlocking control device of the integrated medium-voltage photovoltaic grid-connected system provided by the embodiment of the invention can realize the safety interlocking among all chambers of the integrated medium-voltage photovoltaic grid-connected system arranged in a large photovoltaic power station or a distributed grid-connected power generation system in an electrical and mechanical combined mode, and the integrated medium-voltage photovoltaic grid-connected system comprises an inverter chamber, a transformer chamber and a medium-voltage cabinet chamber which are integrally arranged in the same box body (such as a 20-inch container).
Referring to fig. 3, fig. 3 is a schematic block diagram of an interlock control device of an integrated medium voltage photovoltaic grid-connected system according to an embodiment of the present invention, where the interlock control device of the integrated medium voltage photovoltaic grid-connected system according to the embodiment of the present invention includes: an inverter scram device 100, a medium voltage cabinet scram device 200, and a key exchange box 300, wherein,
when an inverter chamber InverterRoom of the integrated medium-voltage photovoltaic grid-connected system needs to be overhauled or the system needs to break down and needs to stop the system to run urgently, an operator can send an inversion emergency stop signal to the inverter emergency stop device 100 through local control equipment or an upper computer; according to the received inversion emergency stop signal, the Inverter emergency stop device 100 disconnects each Inverter provided in the Inverter Room of the integrated medium-voltage photovoltaic grid-connected system from the Transformer provided in the Transformer Room.
Optionally, the inverter emergency Stop signal may be generated in various manners, for example, the inverter emergency Stop signal may be an inverter emergency Stop button Em Stop 1 provided in the inverter emergency Stop apparatus 100, and when an operator presses the button, the inverter emergency Stop signal may be generated and output. Alternatively, in the case that the inverter emergency Stop button Em Stop 1 is not provided, the inverter emergency Stop signal may be sent by the upper computer, and the upper computer directly controls the operating state of the inverter emergency Stop device 100. Of course, the inverse emergency stop signal can also be sent by an infrared remote controller and the like. It should be noted that any manner of generating the inverse scram signal is optional, and is not limited to the example given in the embodiment of the present invention, and other control manners of generating the inverse scram signal also belong to the protection scope of the present invention. In practical use, in order to prevent malfunction and improve reliability, it is preferable to generate the inverter emergency Stop signal using the inverter emergency Stop button Em Stop 1.
After the Inverter emergency stop device 100 controls the connection between each Inverter and the transformer in the integrated medium-voltage photovoltaic grid-connected system to be disconnected according to the received Inverter emergency stop signal, the locking of the door lock Key A1Key of the Inverter door is further released, so that an operator can take the door lock Key A1Key of the Inverter door under the condition that the electrical connections on the two sides of the Inverter are disconnected, open the door lock A1 of the Inverter Room, enter the Inverter Room, overhaul or maintain the Inverter, and ensure the safety.
When the integrated medium-voltage photovoltaic grid-connected system medium-voltage cabinet Room Switchgear Room needs to be overhauled or the system needs to break down and needs to cut off the system output urgently, an operator can send an output urgent stop signal to the medium-voltage cabinet urgent stop device 200 through local control equipment or an upper computer; according to the received output emergency stop signal, the medium-voltage cabinet emergency stop device 200 disconnects the medium-voltage protection device arranged in the medium-voltage cabinet Room Switchgear Room of the integrated medium-voltage photovoltaic grid-connected system from the Transformer arranged in the Transformer Room.
Specifically, the control principle of the medium voltage cabinet emergency stop device 200 is similar to that of the inverter emergency stop device 100. Preferably, an operator can press a medium-voltage cabinet emergency Stop button Em Stop 2 arranged in the medium-voltage cabinet emergency Stop device 200 to generate and send an output emergency Stop signal, and of course, the output emergency Stop signal can also be output to the medium-voltage cabinet emergency Stop device 200 in other feasible manners such as an upper computer; the medium voltage cabinet scram 200 then, upon receiving the signal, controls the medium voltage protection device (schematically represented by a switch symbol in the medium voltage cabinet Room in fig. 3) in the integrated medium voltage photovoltaic grid-connected system to disconnect from the Transformer in the Transformer Room (schematically represented by a Transformer symbol in fig. 3).
After the medium-voltage cabinet emergency stop device 200 controls the electrical connections on the two sides of the medium-voltage protection device in the integrated medium-voltage photovoltaic grid-connected system to be disconnected according to the received output emergency stop signal, the locking on the door lock Key a2Key of the medium-voltage cabinet chamber is further released, so that an operator can take the door lock Key a2Key of the medium-voltage cabinet chamber under the condition that the electrical connections on the two sides of the medium-voltage protection device are all disconnected, open the door lock a2 of the medium-voltage cabinet chamber Switchgear Room by using the Key, enter the medium-voltage cabinet chamber Switchgear Room, and overhaul or maintain the medium-voltage protection device, thereby ensuring the safety.
After an operator obtains an inverter Room door lock Key a1Key and a medium voltage cabinet Room door lock Key a2Key at the same time, the two keys can be simultaneously inserted into the Key exchange box 300, the Key exchange box 300 locks the two keys, and further, after the two keys are locked, the Key exchange box 300 can release the original locking of a Transformer Room door lock Key B1 Key in the integrated medium voltage photovoltaic grid-connected system, so that the operator can obtain the Key and enter a Transformer Room to overhaul or maintain the Transformer. It is conceivable that, since the connection of each inverter and the medium voltage protection device to the transformer has been disconnected in the process of obtaining the inverter chamber door lock Key a1Key and the medium voltage cabinet chamber door lock Key a2Key, respectively, the transformer is already in a power-off state when the operator can get the transformer chamber door lock Key B1 Key, so that the operator can safely perform the maintenance work.
Further, when an operator unlocks the transformer chamber door lock B1 by using the transformer chamber door lock Key B1 Key to make the door lock B1 in an unlocked state, the transformer chamber door lock Key B1 Key is in a locked state, and the operator cannot obtain the transformer chamber door lock Key B1 Key when the door lock B1 is in an unlocked state. This means that only when the transformer Room door lock B1 is in a locked state and the operator obtains the transformer Room door lock Key B1 Key, the Inverter Room door lock Key a1Key and the medium voltage cabinet Room door lock Key a2Key can be unlocked, and then the normal operation of the electrical equipment in the Inverter Room and the medium voltage cabinet Room switch Room can be resumed.
According to the interlocking control device of the integrated medium-voltage photovoltaic grid-connected system, the connection between each inverter and the transformer and between the transformer and the medium-voltage protection device in the integrated medium-voltage photovoltaic grid-connected system is disconnected in an electrical control mode; the manual disconnection process of each switch in the prior art is replaced, and the problem of complex operation is avoided. Then, under the condition that the corresponding connection is disconnected, the locking of an inverter chamber door lock Key A1Key or a medium-voltage cabinet chamber door lock Key A2Key is released; and furthermore, the high-requirement customization on various hardware in the prior art is avoided in an electric interlocking mode, and the cost is reduced. After the door lock Key A1Key of the inverter room and the door lock Key A2Key of the medium-voltage cabinet room can be taken out, the door lock keys are locked by the Key exchange box 300, and the locking of the door lock Key B1 Key of the transformer room in the integrated medium-voltage photovoltaic grid-connected system is released in a mechanical interlocking mode; and then can be under the condition that the Transformer both sides are connected and all break off, open the lock B1 of Transformer Room through this Transformer Room door lock Key B1 Key, get into Transformer Room and maintain the operation, guaranteed the security of maintaining the operation, simultaneously, can also prevent to be in under the state of overhauing at the Transformer, go on to the electricity operation to inverter Room or medium voltage cabinet indoor set, effectively guarantee operating personnel's personal safety.
It should be noted that the above description states that the operator needs to insert both the inverter chamber door lock Key a1Key and the medium voltage chamber door lock Key a2Key into the Key exchange box 300, which is only one of many control types, how the inverter chamber door lock Key a1Key and the medium voltage chamber door lock Key a2Key are engaged with the Key exchange box 300, depending on the system settings, for example, if the Key exchange box 300 is provided with an induction panel, the inverter compartment door lock Key a1Key and the medium voltage compartment door lock Key A2Key are each provided with a mating induction device, when the induction panel receives the corresponding induction signal, the corresponding key can be in a locking state, that is, the operation of the inverter or the medium voltage cabinet protection device cannot be recovered by the Key, and when the operator obtains the inverter chamber door lock Key a1Key and the medium voltage cabinet chamber door lock Key a2Key, the operator only needs to contact the two keys with the sensing panel provided in the Key exchange box 300. Any way that the inverter chamber door lock Key a1Key and the medium voltage chamber door lock Key A2Key can be locked is optional and also belongs to the protection scope of the present invention.
Another embodiment of the present invention provides a specific interlocking control device for an integrated medium-voltage photovoltaic grid-connected system, and on the basis of fig. 3 and the above-mentioned embodiments, preferably, referring to fig. 4, the inverter emergency stop device 100 includes: n dc side switch control circuits 101, n ac side switch control circuits 102, and a first locking device (not shown in the figure);
the number n is used for representing the number of inverters in the integrated medium-voltage photovoltaic grid-connected system, and is not less than 1 according to actual use conditions.
In order to realize the control function of the inverter emergency stop device 100, each dc-side switch control circuit 101 may control the dc-side switch of the inverter connected to itself to be disconnected according to the received inverter emergency stop signal, so as to disconnect the dc power supply from the inverter. Correspondingly, the ac side switch control circuit 102 may control the ac side of the inverter connected to itself to be turned on or off, i.e., disconnect the inverter from the transformer, according to the received inverter emergency stop signal.
Through the direct-current side switch control circuit 101 and the alternating-current side switch control circuit 102 in the Inverter emergency stop device 100, the electrical connection between each Inverter and the devices on two sides of each Inverter in the integrated medium-voltage photovoltaic grid-connected system can be disconnected, and the safety of the operation personnel entering an Inverter Room to overhaul and maintain the inverters is ensured.
It is worth noting that in the prior art, the inverters need to be manually disconnected one by one, the system is larger, the number of the included inverters is larger, the operation process is more complicated, and the time consumption is longer naturally. The interlocking control device of the integrated medium-voltage photovoltaic grid-connected system provided by the embodiment can simultaneously disconnect all inverters from the direct-current side power supply and the transformer through electrical control, and is convenient, rapid, safe and reliable. In addition, the interlocking control device of the integrated medium-voltage photovoltaic grid-connected system provided by the embodiment can simplify the operation process, remarkably improve the working efficiency and shorten the operation time through the one-time electrical control on each inverter.
Similarly, referring to fig. 5, the medium-voltage cabinet emergency stop device 200 includes: a medium voltage switch control circuit 201 and a second locking device (not shown in the figure). The medium voltage switch control circuit 201 may receive the output emergency stop signal, and after receiving the output emergency stop signal, control the medium voltage switch in the medium voltage protection device to be turned off, so that the medium voltage protection device is no longer connected to the transformer.
After the process of electrically disconnecting the electrical connection is realized by means of the above-mentioned electrical control, an electrical interlock will also be realized by means of the corresponding locking device.
Specifically, the inverter scram device 100 may implement an electrical interlock function through the first locking device. The first locking device is provided with a switch state monitoring circuit and a locking device, wherein the switch state monitoring circuit can detect the states of direct current side switches and alternating current side switches of all inverters in a system, judge whether all the direct current side switches and all the alternating current side switches are disconnected, and generate and output a first unlocking signal to the locking device arranged in the first locking device under the condition that the direct current side switches and the alternating current side switches of all the inverters are detected to be disconnected, so that the locking device can unlock an inverter room door lock Key A1 Key.
Optionally, the locking device arranged in the first locking device may be any device in the prior art that can lock or unlock the inverter chamber door lock Key a1Key according to the received signal, so as to ensure that any person cannot obtain the inverter chamber door lock Key a1Key without receiving the aforementioned first unlocking signal.
Optionally, the main purpose of providing the switch state monitoring circuit in the first locking device is to determine that the dc side switch and the ac side switch of each inverter are both disconnected after the inverter emergency stop signal is sent, so that the inverters are completely disconnected from the system to disconnect the electrical connection, thereby ensuring the safety of the operator.
Of course, if there are other ways to ensure that each inverter is in the power-off state after the inverter emergency stop signal is sent out, the first locking device may also optionally not be provided with the switch state monitoring circuit. If the switch state monitoring circuit is not arranged, the locking equipment can immediately release the locking of the lock Key A1Key of the door of the inverter room after receiving the inversion emergency stop signal, or release the locking of the lock Key A1Key of the door of the inverter room after delaying a period of time after receiving the inversion emergency stop signal; depending on the specific application environment, are all within the scope of the present application.
Similarly, the second locking device in the medium voltage cabinet emergency stop device 200, like the first locking device, also includes a switch state monitoring circuit and a locking device, and the difference is that the switch state monitoring circuit in the second locking device can detect the state of the medium voltage switch in the medium voltage cabinet protection device in the system, determine whether the medium voltage switch is turned off, and generate and output a second unlocking signal to the locking device provided in the second locking device when the medium voltage switch is turned off, so that the locking device unlocks the medium voltage cabinet room door lock Key a2Key, so that the operator can obtain the Key.
In the medium-voltage cabinet emergency stop device 200, after the medium-voltage switch control circuit 201 controls the medium-voltage cabinet protection device to disconnect the electrical connection with the transformer, the electrical equipment in the medium-voltage cabinet switch Room is powered off, at this time, the second locking device in the medium-voltage protection device releases the locking of the door lock Key a2Key of the medium-voltage cabinet under the condition that the medium-voltage switch is disconnected according to the principle, and an operator can obtain the Key to open the door lock a2 of the medium-voltage cabinet switch Room to enter the medium-voltage cabinet switch Room and overhaul or maintain the electrical equipment in the cabinet Room.
Because the middle-voltage cabinet emergency stop device 200 will release the lock of the middle-voltage cabinet Room door lock Key a2Key only when the middle-voltage cabinet protection device is electrically disconnected, when an operator can take the middle-voltage cabinet Room door lock Key a2Key, that is, the electrical equipment in the middle-voltage cabinet Room Switchgear Room is powered off, the operator can safely perform maintenance or repair work, and the safety of the operator is effectively ensured.
Of course, if there are other ways to ensure that the medium voltage switch is in the off state after the output emergency stop signal is sent out, the second locking device may also be selected not to be provided with the switch state monitoring circuit. If the switch state monitoring circuit is not arranged, the locking equipment can immediately unlock the A2Key of the middle-voltage cabinet room door lock after receiving the output emergency stop signal, or unlock the A2Key of the middle-voltage cabinet room door lock after delaying for a period of time after receiving the output emergency stop signal; depending on the specific application environment, are all within the scope of the present application.
The locking device provided by the embodiment can realize the unlocking of the corresponding key after receiving the corresponding electric unlocking signal, avoids high-requirement customization caused by hardware linkage in the prior art, and reduces the cost.
The rest of the structure and the principle are the same as those of the above embodiments, and are not described in detail here.
Another embodiment of the present invention provides a specific interlocking control device for an integrated medium-voltage photovoltaic grid-connected system, on the basis of the above embodiments, optionally refer to fig. 4 and 5, where:
fig. 4 is an electrical wiring schematic diagram of an inverter scram device 100 in an interlock control device of an integrated medium-voltage photovoltaic grid-connected system according to an embodiment of the present invention; fig. 5 is an electrical wiring schematic diagram of a medium voltage cabinet emergency stop device 200 in an interlock control device of an integrated medium voltage photovoltaic grid-connected system according to an embodiment of the present invention.
As can be seen from fig. 4, the dc-side switch and the ac-side switch in the inverter emergency Stop apparatus 100 are both circuit breakers, the dc-side switch control circuit 101 and the ac-side switch control circuit 102 both include controllable switches (switches connected to the inverter emergency Stop button Em Stop 1 in the figure), the controllable switches are respectively connected in series with corresponding shunt coils of the circuit breakers between the power supply and the ground, and the control ends of the controllable switches receive the inverter emergency Stop signal sent by the inverter emergency Stop button Em Stop 1. When the inverter emergency Stop button Em Stop 1 is pressed down and an inverter emergency Stop signal is sent out, the controllable switch is closed, the shunt coil of the circuit Breaker is electrified, and the linkage of the internal mechanism of the circuit Breaker (such as DC Breaker or AC Breaker disconnection) is triggered, so that the circuit connection at the two sides of the inverter is disconnected.
Similarly, as shown in fig. 5, the medium-voltage switch in the medium-voltage cabinet emergency Stop device 200 may also be a circuit breaker, and the medium-voltage switch control circuit 201 includes a controllable switch (a switch connected to the medium-voltage cabinet emergency Stop button Em Stop 2 in the figure), and the controllable switch and a corresponding shunt coil of the circuit breaker are connected in series between the Power Supply and the ground, and receive the output emergency Stop signal sent by the medium-voltage cabinet emergency Stop button Em Stop 2 through the control terminal. When the scram button Em Stop 2 of the medium-voltage cabinet is pressed down and an output scram signal is sent out, the controllable switch is closed, the shunt excitation coil of the circuit breaker is electrified, the linkage of the internal mechanism of the circuit breaker (such as HV VCB disconnection) is triggered, and then the circuit connection on the two sides of the circuit breaker is disconnected.
The circuit breaker is adopted as a medium-voltage switch, a direct-current side switch and an alternating-current side switch, the control principle and the specific realization of an electric circuit are simple, the overhaul and the maintenance of the control device are convenient, meanwhile, the electric isolation can be realized through the circuit breaker, and the safety of the device is further improved.
It should be noted that, in a specific practical application, the dc side switch, the ac side switch and the medium voltage switch are not limited to a circuit breaker, and here, the switches are only an example, and may also be other forms of controllable switches, and corresponding devices capable of achieving electrical connection and disconnection according to an electrical control signal may be adopted, and also belong to the protection scope of the present invention.
The rest of the structure and the principle are the same as those of the above embodiments, and are not described in detail here.
Another embodiment of the present invention further provides an integrated medium-voltage photovoltaic grid-connected system, as shown in fig. 3, including: inverter Room, Transformer Room, medium voltage cabinet Room Switchgear Room and interlock control device as described in any of the above embodiments;
the Inverter Room, the Transformer Room and the medium-voltage cabinet Room Switchgear Room are integrally arranged in the same box body.
The rest of the structure and the principle are the same as those of the above embodiments, and are not described in detail here.
The embodiments of the invention are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The foregoing are merely preferred embodiments of the present invention to enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An interlocking control device of an integrated medium-voltage photovoltaic grid-connected system is characterized by comprising: the system comprises an inverter emergency stop device, a medium-voltage cabinet emergency stop device and a key exchange box; wherein:
the inverter emergency stop device is used for controlling the connection between each inverter and the transformer in the integrated medium-voltage photovoltaic grid-connected system to be disconnected according to the received inverter emergency stop signal and then releasing the locking of a door lock key of the inverter room;
the medium-voltage cabinet emergency stop device is used for controlling the connection disconnection between the medium-voltage protection device and the transformer in the integrated medium-voltage photovoltaic grid-connected system according to the received output emergency stop signal and then releasing the locking of a medium-voltage cabinet chamber door lock key;
the key exchange box is used for unlocking the lock key of the transformer chamber door in the integrated medium-voltage photovoltaic grid-connected system under the condition that the lock key of the inverter chamber door and the lock key of the medium-voltage cabinet chamber door are locked.
2. The interlock control device of the integrated medium voltage photovoltaic grid-connected system according to claim 1, wherein the inverter scram device comprises: the device comprises n direct-current side switch control circuits, n alternating-current side switch control circuits and a first locking device; wherein:
n is the number of inverters in the integrated medium-voltage photovoltaic grid-connected system, and n is more than or equal to 1;
the direct current side switch control circuit is used for controlling the direct current side of the connected inverter to be switched on or off according to the inversion emergency stop signal;
the alternating current side switch control circuit is used for controlling the alternating current side of the connected inverter to be switched on and off according to the inversion emergency stop signal;
the first locking device is used for unlocking the lock key of the door of the inverter chamber when the direct current side switch and the alternating current side switch of all the inverters are turned off.
3. The interlock control device of the integrated medium voltage photovoltaic grid-connected system according to claim 2, wherein the inverter scram device further comprises:
and the inverter emergency stop button is used for generating and outputting the inverter emergency stop signal when being pressed.
4. The interlock control device of the integrated medium voltage photovoltaic grid-connected system according to claim 2, wherein the dc side switch and the ac side switch are both circuit breakers;
the DC side switch control circuit and the AC side switch control circuit both include: a controllable switch; the controllable switch and the shunt coil of the corresponding circuit breaker are connected in series between a power supply and the ground, and the control end of the controllable switch receives the inversion emergency stop signal.
5. The interlocking control device of an integrated medium voltage photovoltaic grid connected system according to claim 2, characterized in that said first locking device comprises: a switch state monitoring circuit and a locking device;
the switch state monitoring circuit is used for detecting whether the direct current side switches and the alternating current side switches of all the inverters are disconnected or not, and generating and outputting a first unlocking signal under the condition that the direct current side switches and the alternating current side switches of all the inverters are disconnected;
the locking device is used for unlocking the lock key of the door of the inverter chamber according to the first unlocking signal.
6. The interlocking control device of the integrated medium voltage photovoltaic grid-connected system according to claim 1, characterized in that the medium voltage cabinet scram device comprises: a medium voltage switch control circuit and a second locking device; wherein:
the medium-voltage switch control circuit is used for controlling a medium-voltage switch in the medium-voltage protection device to be switched off according to the output emergency stop signal;
the second locking device is used for unlocking the key of the door lock of the medium voltage cabinet chamber under the condition that the medium voltage switch is disconnected.
7. The interlocking control device of the integrated medium voltage photovoltaic grid-connected system according to claim 6, wherein the medium voltage cabinet emergency stop device further comprises:
and the middle cabinet emergency stop button is used for generating and outputting the output emergency stop signal when being pressed.
8. The interlocking control device of an integrated medium voltage photovoltaic grid connected system according to claim 6, characterized in that the medium voltage switch is a circuit breaker;
the medium voltage switch control circuit comprises: a controllable switch; the controllable switch and the shunt coil of the corresponding circuit breaker are connected in series between a power supply and the ground, and the control end of the controllable switch receives the output emergency stop signal.
9. The interlocking control device of an integrated medium voltage photovoltaic grid connected system according to claim 6, characterized in that said second locking device comprises: a switch state monitoring circuit and a locking device;
the switch state monitoring circuit is used for detecting whether the medium-voltage switch is disconnected or not, and generating and outputting a second unlocking signal under the condition that the medium-voltage switch is disconnected;
the locking device is used for unlocking the lock key of the middle pressure cabinet chamber door according to the second unlocking signal.
10. An integrated medium voltage photovoltaic grid connected system, comprising: an inverter compartment, a transformer compartment, a medium voltage cabinet compartment and an interlock control device of an integrated medium voltage photovoltaic grid connected system according to any one of claims 1-9;
the inverter chamber, the transformer chamber and the medium-voltage cabinet chamber are integrally arranged in the same box body.
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| CN110829482B (en) | 2022-04-08 |
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