CN209896703U - Anti-reverse power automatic control device and new energy power generation system - Google Patents
Anti-reverse power automatic control device and new energy power generation system Download PDFInfo
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- CN209896703U CN209896703U CN201920553227.7U CN201920553227U CN209896703U CN 209896703 U CN209896703 U CN 209896703U CN 201920553227 U CN201920553227 U CN 201920553227U CN 209896703 U CN209896703 U CN 209896703U
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Abstract
The utility model relates to an automatic anti-reverse power control device and a new energy power generation system, wherein, the automatic anti-reverse power control device comprises an alternating current board, a CPU board and an outlet board, the alternating current board collects real-time voltage and real-time current of property right boundary points so as to acquire the real-time power of the property right boundary points, the CPU board comprehensively judges whether to input a gathering line or cut off the gathering line by comparing the real-time power and preset power of the property right boundary points and the state of a gathered gathering line switch, when the gathering line needs to be input, the closing outlet is controlled so as to control the closing switch of the gathering line switch so as to input the gathering line, when the gathering line needs to be cut off, the tripping outlet is controlled so as to control the breaking switch of the gathering line so as to cut off the output of the gathering line, and then the output power of the new energy power generation system is adjusted, so that the output power of the new energy power, energy is saved, and reverse power can be prevented from being generated.
Description
Technical Field
The utility model relates to a new forms of energy power generation control field especially relates to a prevent reverse power automatic control device and new forms of energy power generation system.
Background
With the development of new energy technology, the national power grid adopts an encouraging and cooperative attitude for distributed photovoltaic power generation at present. The photovoltaic power generation comprises three modes of spontaneous self-use, spontaneous self-use residual power on-line and generated energy complete on-line. The spontaneous self-use mode is limited by technical conditions and the level of consumption of owners and is developed slowly at present.
A reverse power control cabinet is usually adopted in a spontaneous self-service project, and the output power of an inverter is adjusted or a photovoltaic power generation system is cut off by comparing the power of a property right demarcation point with a control power fixed value. The reverse power control cabinet and the inverter are communicated by RS485, the whole system is over dependent on communication, and if the communication is interrupted, the reverse power control cabinet can directly cut off the photovoltaic power generation system, so that the photovoltaic power generation resource is wasted.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide an automatic reverse power prevention control device and a new energy power generation system for solving the problem of power generation resource waste in the conventional technology.
The utility model provides an anti-reverse power automatic control device for new forms of energy power generation system to set up in the point of being incorporated into the power networks, anti-reverse power automatic control device includes:
the alternating current board is used for collecting real-time voltage and real-time current of the property right boundary point, wherein the property right boundary point comprises a boundary point between a power grid and a load;
the CPU board is connected with the alternating current board and used for calculating real-time power according to the real-time voltage and the real-time current, preset power is stored in the CPU board, and the CPU board is also used for comparing the real-time power with the preset power;
the outlet plate is connected with the CPU plate and comprises a plurality of groups of closing outlets and a plurality of groups of tripping outlets, the closing outlets are connected with the collecting line switch and used for controlling the closing of the collecting line switch, and the tripping outlets are correspondingly connected with the collecting line switch and the grid-connected switch and used for controlling the disconnection of the collecting line switch and the grid-connected switch; when the real-time power is larger than the preset power, the CPU board controls at least one collecting line switch to be closed by controlling the closing outlet, so that the new energy power generation system supplies power to the load; when the real-time power is smaller than the preset power, the CPU board controls the tripping outlet to control at least one collecting line switch to be disconnected so as to prevent the new energy power generation system from supplying power to the power grid.
The above-mentioned embodiment provides an automatic reverse power control device, real-time voltage and real-time current and then can know the real-time power of property right demarcation point are gathered through setting up the interchange board, the CPU board is through comparing the real-time power and the predetermined power of property right demarcation point, and the state of the collection line switch that gathers judges whether to put into the collection line or cut off the collection line synthetically, when needing to put into the collection line, through control combined floodgate export and then control the closure of collection line switch in order to put into the collection line, when needing to cut off the collection line, through control tripping operation export control collection line switch disconnection in order to cut off the output of collection line, and then adjust the output of new forms of energy power generation system, make the output of new forms of energy power generation system and the consumption level of local load balanced, the energy saving, can also prevent to produce reverse power simultaneously.
In one embodiment, the switching system further includes an opening board, where the opening board is connected to the CPU board, and is configured to detect a state of the aggregation switch and send the state of the aggregation switch to the CPU board when the real-time power is greater than a preset power, where when at least one aggregation switch is in an off state, the CPU board compares a rated power of an open aggregation line with a magnitude of a first difference, and if the first difference is greater than the rated power of the open aggregation line, the CPU board controls the aggregation switch to be closed by controlling the closing outlet, where the first difference is a difference between the real-time power and the preset power.
In one embodiment, the open-close board is further configured to collect the state of the collection line switch when the real-time power is less than the preset power to search for the collection line switch in a closed state, and send the collection line switch to the CPU board, and the CPU board compares the rated power of each closed collection line and searches for a target collection line with the minimum rated power;
and the CPU board judges the magnitude of a second difference between the rated power and the real-time power of the target collection line and the sum of the rated power of each collection line in a closed state, and when the second difference is smaller than the target power, the CPU board controls the trip outlet to control the collection line switch corresponding to the target collection line to be switched off, wherein the target power is the sum of the rated power and the fixed power of the collection lines in a conducting state.
In one embodiment, when the second difference is greater than or equal to the sum of the rated powers, the CPU board controls the grid-connected switch of the new energy power generation system to be turned off by controlling the corresponding trip outlet.
In one embodiment, the opening board is further connected with an external power supply for providing working power for the alternating current board, the outlet board and the CPU board.
In one embodiment, the ac board includes a voltage collector and a current collector, and the voltage collector and the current collector are respectively connected to the CPU board.
A new energy power generation system comprises the anti-reverse power automatic control device.
In one embodiment, the new energy power generation system further comprises at least one power generation unit, at least one collection line and a collection line switch correspondingly connected with the collection line;
one end of each collecting line is correspondingly connected with the power generation units one by one, and the other end of each collecting line is correspondingly connected with one end of the collecting line switch;
the opening plate is connected with the collection line switch and is used for collecting the state of the collection line switch;
the closing outlet and the tripping outlet are respectively connected with the collecting line switches in a one-to-one correspondence mode and used for controlling the collecting line switches to be closed or opened under the action of the CPU board.
In one embodiment, the new energy power generation system further comprises a grid-connected line;
the other end of each collection line switch is connected with the new energy power generation system bus, and the new energy power generation system bus feeds the electric energy generated by the power generation unit to a bus where a user load is located through the grid-connected line to supply power to the load.
In one embodiment, the new energy power generation system further comprises a grid-connected switch, wherein one end of the grid-connected switch is connected with the grid-connected line, and the other end of the grid-connected switch is connected with a bus where a user load is located;
the opening plate is also connected with the grid-connected switch and used for collecting the state of the grid-connected switch;
and the tripping outlet is also connected with the grid-connected switch and used for controlling the grid-connected switch to be disconnected under the action of the CPU board.
Drawings
FIG. 1 is a diagram of a method for using an automatic reverse power control device according to an embodiment of the present application;
FIG. 2 is a diagram illustrating a method for using an automatic reverse power control device according to another embodiment of the present application;
FIG. 3 is a diagram illustrating a method for using an automatic reverse power control device according to another embodiment of the present application;
FIG. 4 is a block diagram of an automatic reverse power control device according to an embodiment of the present disclosure;
fig. 5 is a main wiring diagram of a new energy power generation system according to an embodiment of the present application.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, an embodiment of the present application provides an automatic anti-reverse power control device, and a method for using the automatic anti-reverse power control device includes the following steps:
s100: real-time power of a title demarcation point is detected.
The embodiment provides a reverse power protection method for a new energy power generation system, wherein the new energy power generation system can be a photovoltaic power generation system, a wind power generation system and the like. In the spontaneous self-use mode of the new energy power generation system, the energy flow direction is as follows: the energy of the new energy power generation system is provided for local loads for use, and when the energy required by the local loads is more and the new energy power generation system is not enough, the energy of a power grid is used for supplement.
In the spontaneous self-service mode, the electric energy generated by the new energy power generation system is only used for providing the electric energy for local loads, so that the new energy power generation system is required to be prevented from generating excessive energy and the redundant energy flows to a power grid, wherein the energy flowing into the power grid is reverse power, and when the reverse power occurs, the energy of the new energy power generation system is required to be adjusted to realize zero-power output to the power grid.
According to the embodiment, the output energy of the new energy power generation system is adjusted by adjusting the number of the collection lines which are put into the new energy power generation system, so that zero power output to a power grid is realized. The new energy power generation system comprises at least one power generation unit, at least one collection line, a collection line switch and a grid-connected switch, wherein the collection line switch and the grid-connected switch are correspondingly connected with the collection line. One end of each collection line is correspondingly connected with one power generation unit, the other end of each collection line is correspondingly connected with one end of a collection line switch, the other ends of the collection line switches are connected to a new energy power generation system bus through the collection line switches, the new energy power generation system bus is connected to a bus where a user load is located through a grid-connected line, and the new energy power generation system is connected to a local load bus through the grid-connected line. The grid-connected circuit is provided with a grid-connected switch, whether the grid-connected switch is closed or not is firstly checked, and when the grid-connected switch is closed, the anti-reverse power automatic control device collects the real-time power of the property right boundary point and judges whether the real-time power is reverse power or not. The property right demarcation point is a first breaker demarcation point between a power grid and a user power distribution room. When the power flows out from the power grid, it is the forward power, and when the power flows into the power grid, it is the reverse power, in this embodiment, the real-time power flowing out of the power grid is defined as positive, and the real-time power flowing into the power grid is defined as negative. Specifically, the voltage and current at the title boundary point can be detected, and then the real-time power at the title boundary point can be calculated.
S200: and comparing the real-time power with the preset power.
The automatic reverse power prevention control device is stored with preset power, and after the real-time power is collected, the real-time power is compared with the preset power to judge whether the reverse power is generated.
S300: and when the real-time power is larger than the preset power, controlling at least one collecting line switch to be closed so as to enable the new energy power generation system to supply power for the load.
When the real-time power is larger than the preset power, the real-time power is the forward power, namely the power grid supplies power to the local load, which indicates that the power consumption of the power grid of the local load is more at the moment, therefore, a gathering line needs to be input, and a new energy power generation system is adopted to supply power to the local load so as to reduce the power consumption of the power grid.
Specifically, the new energy power generation system comprises a plurality of power generation units and collection lines correspondingly connected with the power generation units, wherein each collection line is connected in parallel, and a collection line switch is arranged on each collection line. The other end of each collecting line is connected with a new energy power generation system bus, each bus is used for collecting electric energy generated by the power generation unit to a grid-connected line, and when the more collecting lines are input into the new energy power generation system, the higher the generated energy of the new energy power generation system is. And the grid-connected line is used for feeding the electric energy generated by the power generation unit to a bus where the user load is located so as to supply the electric energy to the local load.
The anti-reverse power automatic control device is connected with the collection line switches to control the connection and disconnection of the collection line switches, and when the collection line needs to be input, the anti-reverse power automatic control device controls at least one collection line switch to be connected so that the new energy power generation system supplies power for the load.
S400: and when the real-time power is smaller than the preset power, controlling at least one collecting line switch to be switched off so as to prevent the new energy power generation system from supplying power for the power grid.
When the real-time power is smaller than the preset power, the real-time power is reverse power, namely, the new energy power generation system not only supplies power for a local load, but also returns extra electric quantity to a power grid, so that the number of input collection lines needs to be reduced to reduce the input power of a grid-connected line, and further the real-time power of a property right demarcation point is controlled. The anti-reverse power automatic control device reduces the output power of the new energy system by controlling the disconnection of at least one collection line switch, and prevents the energy of the new energy power generation system from being returned to a power grid.
S500: and when the real-time power is equal to the preset power, maintaining the current state.
When the real-time power is equal to the preset power, it is indicated that no reverse power is input into the power grid at present, the consumption level of the local load and the generated energy of the new energy power generation system are in a balanced state, and the current state is maintained, so that the collection line is not input or withdrawn.
The application method of the automatic reverse power prevention control device in the embodiment comprises the steps of simultaneously collecting real-time power of property right decomposition points, comparing the real-time power with preset power, judging whether reverse power occurs, and controlling the junction switch to be disconnected when the reverse power occurs so as to reduce output of a new energy power generation system and prevent reverse power from being generated.
Referring to fig. 2, in one embodiment, when the real-time power is greater than the preset power, the controlling the at least one bussing switch to close includes:
s310: and when the real-time power is greater than the preset power, the real-time power is the forward power, and the on-off state of a collection line in the new energy power generation system is detected.
Specifically, when the real-time power is greater than the preset power, it indicates that the local load uses a large amount of power in the power grid, and therefore a collection line needs to be input. Before the collection line is put into use, the anti-reverse power automatic control device firstly collects the state of the collection line switch and judges whether the collection line switch needs to be controlled or not. When all the collection line switches are in a closed state, namely all the collection lines are put into use, the output of the new energy power generation system reaches the maximum, and at the moment, the collection line switches do not need to be controlled to be closed.
S320: when at least one collection line switch is in an off state, a collection line corresponding to the collection line switch in the off state is determined, and the rated power of the disconnected collection line is compared with the first difference value.
When at least one gathering line switch is in an off state, gathering lines which are not input at the moment exist, and the anti-reverse power automatic control device needs to judge whether a certain gathering line is input or not. If no reverse power is present after the collection lines are put in, the corresponding collection lines can be put in. The automatic anti-reverse power control device obtains a first difference value by subtracting the real-time power and the preset power, and compares the first difference value with the rated power to judge whether the corresponding collection line needs to be put in.
S330: and if the first difference is larger than the rated power of one disconnected collection line, controlling the corresponding collection line switch to be closed.
When the first difference is larger than the rated power of a certain gathering line in the disconnected state, the gathering line is put into use at the moment, the power consumption of the power grid can be reduced, and reverse power cannot occur. When the first difference is smaller than the rated power of a certain gathering line in a disconnected state, if the gathering line is input, partial power is returned to the power grid to generate reverse power, and at the moment, the gathering line cannot be input. It should be noted that the real-time power and the first difference are not fixed, and the real-time power and the preset power change after each time the line is collected.
Specifically, when P isiAnd P isi+1When the strip collecting line switch is in the off state, the P-th line switch is comparediThe rated power of the strip collection line is larger than the first difference value if the first difference value is larger than the pthiThe rated power of the strip collecting line, the inverse power preventing automatic control device controls the No. PiThe collector switch corresponding to the strip collector is closed to put in the P-thiThe strips converge the lines. At the moment, the automatic inverse power prevention control device detects the real-time power at the property right decomposition point again, and the real-time power and the preset power are subtracted again to obtain a first difference value. Comparing the first difference and then the P-thi+1Rated power of the strip collector line, if the first difference is less than the Pthi+1The rated power of the strip collecting line is not put into the Pthi+1The strips gather the lines to prevent back power from being generated.
Referring to fig. 3, when the real-time power is less than the preset power, the step of controlling the at least one bus switch to be turned off includes the following steps:
s410: and when the real-time power is smaller than the preset power, the real-time power is reverse power, and the state of the collection line switch is detected so as to search the collection line switch in a closed state.
Specifically, when the real-time power is smaller than the preset power, it indicates that the electricity consumption of the local load is low, and a part of the electricity of the new energy power generation system flows into the power grid besides being supplied to the local load, that is, the reverse power appears. At this time, part of the collection line needs to be disconnected, and the output of the new energy power generation system is reduced to eliminate the reverse power.
Before disconnecting the collection line switch, the state of the collection line switch needs to be detected, the position of the collection line switch which is in a closed state is judged, and at least one collection line switch is disconnected according to the obtained state of the collection line switch, so that the generated energy of the new energy power generation system and the consumption of a local load are in a balanced state.
S420: and determining the corresponding collection line of the collection line switch in the closed state, and searching a target collection line with the minimum rated power.
In order to increase the customer's consumption level, the target collector line with the smallest rated power is usually disconnected, and if the target collector line is disconnected, the reverse power still exists, and then the target collector line with the next smallest rated power is disconnected.
The reverse power detection device is pre-stored with the rated power of each collection line, when a collection line switch in a closed state is detected, the position of the conducted collection line can be known, the rated power of each conducted collection line is compared, and a target collection line with the minimum rated power is found out.
S430: and obtaining a second difference value by subtracting the rated power of the minimum aggregation line from the real-time power, and comparing the second difference value with the target power, wherein the target power is the sum of the rated power of the aggregation lines in a conducting state and the sum of the fixed power.
When the real-time power is smaller than the preset power, the real-time power is the inverse power, and therefore a second difference value obtained by subtracting the rated power of the minimum aggregation line from the real-time power is the sum of the absolute values of the minimum rated power and the real-time power. And comparing the second difference with a target power, wherein the target power is the sum of the rated power of the collector line in the conducting state and a fixed power, and the fixed power is a preset power value which can be positive, negative or zero. By comparing the sizes of the two, it is determined whether or not the reverse power can be eliminated by cutting the collector line.
S440: and when the second difference is smaller than the target power, controlling the collection line switch corresponding to the target collection line to be switched off.
When the sum of the minimum rated power and the absolute value of the real-time power is less than the sum of the rated power of the input collection lines, the situation that reverse power does not exist when at least one collection line is input is shown, and the number of the input collection lines is reduced at the moment, so that the reverse power can be prevented from appearing, and therefore the reverse power can be controlled by gradually quitting the collection lines. And after the target collection line is cut off, judging the size of the real-time power and the preset power at the moment again, if the real-time power is larger than the preset power, not cutting off the collection line any more, and if the real-time power is still smaller than the preset power, continuing to cut off the target collection line with the minimum rated power in the rest of the thrown collection lines.
When the sum of the minimum rated power and the absolute value of the real-time power is larger than the sum of the rated power of the input collection lines, which indicates that reverse power still exists even if only one collection line is input, the reverse power cannot be reduced by cutting off the collection lines, so that the grid-connected switch is directly cut off, the output of the new energy power generation system is cut off, and a power grid is adopted to supply power to a local load.
According to the automatic control method for the anti-reverse power, when the real-time power is larger than the preset power, the input of the collection line is controlled, the consumption of the local load on the new energy power generation system is improved, and the consumption level is further improved. And when the real-time power is smaller than the preset power, controlling to disconnect the collection line, so that the generated energy of the new energy power generation system is balanced with the consumption level of the local load, and the reverse power is eliminated.
Referring to fig. 4, an embodiment of the present invention provides an automatic reverse power control device, which can be used in a self-service project of 10kV and 35kV grid-connected Unit capacities 6MWp to 20MWp, but is not limited to the project of 6MWp to 20MWp, and includes an ac board 110, a CPU (Central Processing Unit) board 120, and an outlet board 130.
The automatic anti-reverse power control device is arranged at a grid-connected point, and the property right demarcation point is a demarcation point between a power grid and a load. The ac board 110 may include a voltage detector for collecting real-time voltage at the title boundary point and a current detector for detecting real-time current at the title boundary point and transmitting the collected real-time voltage and real-time current to the CPU board 120.
The CPU board 120 calculates real time power at the title demarcation point based on the real time voltage and real time current. The CPU board 120 includes a storage unit and a logic operation unit, the storage unit is pre-stored with a preset power, the CPU board 120 can compare the calculated real-time power with the preset power, and the logic operation unit is responsible for logic comparison and issues a switching-on/off command.
The outlet board 130 is connected to the CPU board 120, and the outlet board 130 includes n combined gate outlets and n +1 sets of trip outlets, where the n combined gate outlets are correspondingly connected to the n trunk switches, the n sets of trip outlets are correspondingly connected to the n trunk switches, and one trip outlet is connected to the grid-connected switch.
When the real-time power is larger than the preset power, the real-time power is the forward power, namely, the power grid supplies power to the local load, which indicates that the power consumption of the power grid of the local load is more at the moment, therefore, a gathering line needs to be input, and a new energy power generation system is adopted to supply power to the local load so as to reduce the power consumption of the power grid. At this time, the CPU board 120 controls at least one collection line switch to be closed by controlling the closing outlet, so that the new energy power generation system supplies power to the load. When the real-time power is smaller than the preset power, the real-time power is reverse power, namely, the new energy power generation system not only supplies power for a local load, but also returns extra electric quantity to a power grid, so that the number of input collection lines needs to be reduced to reduce the input power of a grid-connected point, and the real-time power of a property right boundary point is controlled. At this time, the CPU board 120 controls the trip outlet to control the at least one collection line switch to be turned off, so as to reduce the output power of the new energy system, balance the power generation amount of the new energy power generation system with the consumption amount of the local load, and prevent the energy of the new energy power generation system from being returned to the power grid.
The automatic anti-reverse power control device provided by the above embodiment can acquire the real-time power of the property right boundary point by setting the alternating current board 110 to acquire the real-time voltage and the real-time current of the property right boundary point, the CPU board 120 comprehensively judges whether to put in the collection line or cut off the collection line by comparing the real-time power of the property right boundary point with the preset power and the state of the collected collection line switch, when the collection line needs to be put in, the CPU board controls the closing of the collection line switch by controlling the closing outlet to put in the collection line, and when the collection line needs to be cut off, controls the opening of the collection line switch by controlling the tripping outlet to cut off the output of the collection line, thereby adjusting the output power of the new energy power generation system, so that the output power of the new energy power generation system is balanced with the consumption level of the local load, saving energy, and meanwhile, the generation.
In one embodiment, the anti-reverse power automatic control device further includes an open board 140, and the open board 140 is connected to the CPU board 120, and is configured to collect the on-off state of the bus when the real-time power is greater than the preset power, and send the on-off state of the bus to the CPU board 120. When the switching-in board 140 detects that at least one collection line switch is in a disconnected state, the CPU board 120 makes a difference between the rated power and the real-time power to obtain a first difference value, and compares the rated power of the disconnected collection line with the first difference value, and when the first difference value is greater than the rated power of the disconnected collection line, the CPU board controls the corresponding collection line switch to be closed by controlling the closing outlet.
For example, the new energy power generation system includes 5 collection lines, each collection line is correspondingly connected with a collection line switch, the opening plate 140 is connected with each collection line switch and is used for collecting the state of the collection line switch, and when the opening plate 140 collects the pth collected by the opening plate 140iThe collector switch connected by the collector is in off state, and the opening plate 140 opens the P-th collectoriThe state of the bus switch of the bus connection is sent to the CPU board 120, and the CPU board 120 compares the PthiThe rated power of the strip collection line is larger than the first difference value if the first difference value is larger than the pthiRated power of the strip collecting line, the CPU board 120 controls the P-th switch-on outletiThe collector switch corresponding to the strip collector is closed to put in the P-thiThe strips converge the lines.
When the real-time power is smaller than the preset power, the open board 140 is configured to collect the state of the bus switch to search for the bus switch in the closed state, and send the bus switch to the CPU board 120. The CPU board 120 compares the rated power of each of the collection lines in the closed state, and finds a target collection line having the smallest rated power. The CPU board 120 obtains a second difference by subtracting the real-time power from the rated power of the target bus, and since the real-time power is the inverse power at this time, the second difference is the sum of the absolute values of the minimum real-time power and the rated power. And comparing the second difference with a target power, wherein the target power is the sum of the rated power of the collector line in the conducting state and a fixed power, and the fixed power is a preset power value which can be positive, negative or zero. By comparing the sizes of the two, it is determined whether or not the reverse power can be eliminated by cutting the collector line.
When the sum of the minimum absolute value of the rated power and the real-time power is less than the sum of the rated powers of the input collection lines, it indicates that there is no reverse power when at least one collection line is input, and at this time, the number of input collection lines is reduced to prevent the occurrence of reverse power, so that the reverse power can be controlled by gradually withdrawing the collection lines, and the CPU board 120 controls the collection line switch of the target collection line to be switched off by controlling the trip outlet to cut off the target collection line, so that the reverse power can be reduced. After the target aggregation line is cut off, the CPU board 120 determines the magnitude of the real-time power and the preset power again, if the real-time power is greater than the preset power, the aggregation line is not cut off, and if the real-time power is still less than the preset power, the target aggregation line with the minimum rated power among the remaining added aggregation lines is continuously cut off.
When the sum of the minimum rated power and the absolute value of the real-time power is larger than the sum of the rated power of the input collection lines, which indicates that reverse power still exists even if only one collection line is input, the collection lines are cut off, and the reverse power cannot be reduced, so that the CPU board directly cuts off the grid-connected switch by controlling the trip outlet, cuts off the output of the new energy power generation system, and adopts a power grid to supply power for a local load.
In one embodiment, the access board 140 is further connected to an external power source for providing power to the ac board 110, the outlet board 130, and the CPU board 120.
When the real-time power is greater than the preset power, the CPU board 120 controls the input of the collection line, so that the consumption of the local load on the new energy power generation system is increased, and the consumption level is further increased. When the real-time power is smaller than the preset power, the CPU board 120 controls to disconnect the collection line, so that the generated energy of the new energy power generation system is balanced with the consumption level of the local load, and the reverse power is eliminated.
Referring to fig. 5, an embodiment of the present application provides a new energy power generation system, which includes the above-mentioned anti-reverse power automatic control device 100. The new energy power generation system further comprises a plurality of new energy power generation units 200, a collection line 300 and a grid-connected outlet line 400. The new energy power generation unit 200 may be a photovoltaic power generation unit, a wind power generation unit, or the like, and the photovoltaic power generation unit is taken as an example in the present embodiment for description. The photovoltaic power generation unit may be a solar cell panel, the solar cell panel is respectively connected to the collection lines 300, the collection lines 300 are provided with collection line switches 310, the collection lines 300 are connected to the bus bars through the collection line switches 310, and the collection lines 300 are connected in parallel. The bus bar is connected with the grid-connected outlet 400 and is connected to the bus bar where the user load is located through the grid-connected switch 410 so as to be used by the local load.
The anti-reverse power automatic control device 100 includes an ac board 110, a CPU board 120, an outlet board 130, and an opening board 140. The automatic anti-reverse power control device 100 is disposed at a grid-connected point, wherein the ac board 110 is used for collecting real-time voltage and real-time current of a property right boundary point, and the CPU board 120 is connected to the ac board 110 and is used for receiving the real-time voltage and the real-time current and calculating real-time power. The outlet board 130 is connected to the CPU board 120, and the outlet board 130 includes n combined gate outlets and n +1 sets of trip outlets, where the n combined gate outlets are correspondingly connected to the n trunk line switches 310, the n sets of trip outlets are correspondingly connected to the n trunk line switches 310, and one trip outlet is connected to the grid-connected switch 410. The access board 140 is also connected to the collection line switch 310 and the grid-connected switch 410, and is configured to collect states of the collection line switch 310 and the grid-connected switch 410 and send the collected states to the CPU board 120, so that the CPU board 120 controls the corresponding collection line to be put into the new energy power generation system or to exit the new energy power generation system according to the states of the collection line switch 310 and the grid-connected switch 410 and the real-time power of the property right decomposition point.
According to the new energy power generation system provided by the embodiment, the anti-reverse power automatic control device is provided with the plurality of groups of tripping outlets and closing outlets, the tripping outlets and the closing outlets are controlled to control the closing and the opening of the collection line switch by detecting the real-time power, and then the collection line is put into or withdrawn, so that the purpose of adjusting the power of the property right dividing point is achieved, the reverse power is prevented, and meanwhile, the consumption level of a user on the new energy power generation system is improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. The utility model provides an anti-reverse power automatic control device for new forms of energy power generation system to set up in the department that is incorporated into the power networks, its characterized in that, anti-reverse power automatic control device includes:
the alternating current board is used for collecting real-time voltage and real-time current of the property right boundary point;
the CPU board is connected with the alternating current board and used for calculating real-time power according to the real-time voltage and the real-time current, preset power is stored in the CPU board, and the CPU board is also used for comparing the real-time power with the preset power;
the outlet plate is connected with the CPU plate and comprises a plurality of groups of closing outlets and a plurality of groups of tripping outlets, the closing outlets are connected with the collecting line switch and used for controlling the closing of the collecting line switch, and the tripping outlets are correspondingly connected with the collecting line switch and the grid-connected switch and used for controlling the disconnection of the collecting line switch and the grid-connected switch; when the real-time power is larger than the preset power, the CPU board controls at least one collecting line switch to be closed by controlling the closing outlet, so that the new energy power generation system supplies power to a load; when the real-time power is smaller than the preset power, the CPU board controls at least one collecting line switch to be disconnected by controlling the tripping outlet, so that the new energy power generation system is prevented from supplying power to a power grid.
2. The automatic anti-reverse power control device according to claim 1, further comprising an opening board connected to the CPU board, wherein the opening board detects a state of the collecting line switch and sends the state of the collecting line switch to the CPU board when the real-time power is greater than a preset power, the CPU board compares a rated power of an open collecting line with a magnitude of a first difference when at least one collecting line switch is in an open state, and controls the closing of the collecting line switch by controlling the closing outlet if the first difference is greater than the rated power of the open collecting line, wherein the first difference is a difference between the real-time power and the preset power.
3. The automatic anti-reverse power control device according to claim 2, wherein the open board is further configured to collect the state of the collection line switch when the real-time power is less than the preset power to search for the collection line switch in a closed state, and send the collection line switch to the CPU board, and the CPU board compares the rated power of each closed collection line and searches for a target collection line having a minimum rated power;
and the CPU board judges the magnitude of a second difference between the rated power and the real-time power of the target collection line and the sum of the rated power of each collection line in a closed state, and when the second difference is smaller than the target power, the CPU board controls the trip outlet to control the collection line switch corresponding to the target collection line to be switched off, wherein the target power is the sum of the rated power and the fixed power of the collection lines in a conducting state.
4. The automatic reverse-power-preventing control device according to claim 3, wherein when the second difference is greater than or equal to the sum of the rated powers, the CPU board controls a grid-connected switch of the new energy power generation system to be turned off by controlling a corresponding trip outlet.
5. The automatic power control device of any one of claims 2-4, wherein an external power source is further connected to the opening board for providing working power to the AC board, the outlet board and the CPU board.
6. The automatic reverse-power prevention control device according to claim 5, wherein the alternating current board comprises a voltage collector and a current collector, and the voltage collector and the current collector are respectively connected with the CPU board.
7. A new energy power generation system, characterized by comprising the automatic anti-reverse power control device according to any one of claims 2 to 6.
8. The new energy power generation system as claimed in claim 7, further comprising at least one power generation unit, at least one collection line, and a collection line switch connected to the collection line;
one end of each collecting line is correspondingly connected with the power generation units one by one, and the other end of each collecting line is correspondingly connected with one end of the collecting line switch;
the opening plate is connected with the collection line switch and is used for collecting the state of the collection line switch;
the closing outlet and the tripping outlet are respectively connected with the collecting line switches in a one-to-one correspondence mode and used for controlling the collecting line switches to be closed or opened under the action of the CPU board.
9. The new energy power generation system of claim 8, further comprising a grid tie line;
the other end of each collection line switch is connected with a new energy power generation system bus, and the new energy power generation system bus feeds electric energy generated by the new energy power generation system to a bus where a load is located through the grid-connected line to supply power to the load.
10. The new energy power generation system according to claim 9, further comprising a grid-connected switch, wherein one end of the grid-connected switch is connected to the grid-connected line, and the other end of the grid-connected switch is connected to a bus where a user load is located;
the opening plate is also connected with the grid-connected switch and used for collecting the state of the grid-connected switch;
and the tripping outlet is also connected with the grid-connected switch and used for controlling the grid-connected switch to be disconnected under the action of the CPU board.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109861299A (en) * | 2019-04-22 | 2019-06-07 | 协鑫能源工程有限公司 | Anti- inverse probability autocontrol method, device and grid-connected power generation system |
| CN111431209A (en) * | 2020-04-26 | 2020-07-17 | 协鑫能源工程有限公司 | Grid-connected power generation anti-reflux system and method, computer equipment and storage medium thereof |
| CN112751319A (en) * | 2020-12-29 | 2021-05-04 | 中国电力工程顾问集团西北电力设计院有限公司 | Low-power protection control method during unit starting |
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2019
- 2019-04-22 CN CN201920553227.7U patent/CN209896703U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109861299A (en) * | 2019-04-22 | 2019-06-07 | 协鑫能源工程有限公司 | Anti- inverse probability autocontrol method, device and grid-connected power generation system |
| CN111431209A (en) * | 2020-04-26 | 2020-07-17 | 协鑫能源工程有限公司 | Grid-connected power generation anti-reflux system and method, computer equipment and storage medium thereof |
| CN111431209B (en) * | 2020-04-26 | 2024-05-14 | 协鑫绿能***科技有限公司 | Grid-connected power generation anti-reflux system and method thereof, computer equipment and storage medium |
| CN112751319A (en) * | 2020-12-29 | 2021-05-04 | 中国电力工程顾问集团西北电力设计院有限公司 | Low-power protection control method during unit starting |
| CN112751319B (en) * | 2020-12-29 | 2024-01-30 | 中国电力工程顾问集团西北电力设计院有限公司 | Low-power protection control method for unit starting |
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Address after: 210058 Longtan logistics base 1, Longgang street, Qixia Road, Qixia, Jiangsu, 3-100 Patentee after: GCL Green Energy System Technology Co.,Ltd. Address before: 210058 Longtan logistics base 1, Longgang street, Qixia Road, Qixia, Jiangsu, 3-100 Patentee before: GCL ENERGY ENGINEERING CO.,LTD. |