CN112736980B - Grid-connected management system and method for generator sets of different types - Google Patents
Grid-connected management system and method for generator sets of different types Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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Abstract
The invention discloses a grid-connected management system and method of generator sets with different models, which relate to the technical field of generator grid connection, wherein the system comprises: the system comprises a grid-connected controller, at least two generator sets with different models, a grid-connected bus and a power grid; the power grid comprises a first output bus and a second output bus which are coupled through a first switch unit; the grid-connected controller is electrically connected with the first output bus through a first sensor, is electrically connected with the second output bus through a second sensor and is electrically connected with the grid-connected bus through a third sensor; the controllers of the generator sets are respectively and electrically connected with the grid-connected controller through different first signal buses, and the output ends of the generator sets are respectively and electrically connected with the grid-connected buses through different second switch units; the controllers of the generator sets are also electrically connected with the grid-connected buses through different fourth sensors respectively; the output end of the grid-connected bus and the second output bus of the power grid are respectively coupled with a load. Thus, the grid-connected function of the generator sets with different models is realized.
Description
Technical Field
The invention relates to the technical field of generator grid connection, in particular to a grid connection management system and method for generator sets of different types.
Background
While social economy rapidly develops, the power industry is also faced with more pressure and challenges, the scale of power users is continuously enlarged, the requirements of people on the power supply availability and stability are higher and higher, no matter in emergency power conservation or uninterrupted operation, the generator set is required to be used, the reliability and the availability of the generator set are improved, the operation cost is reduced, and the method is a target continuously pursued by power grid enterprises.
In the generator sets purchased in the past, brands are more, power is uneven, the generator sets are combined and connected with each other, the manual operation of a senior professional person is necessary to realize the operation, and when a certain generator set fails, the worker cannot cut into a standby generator set and cut off the failed generator set at the first time, and sometimes even huge losses are caused. In the conventional parallel operation and grid connection technology of the generator sets, the generator sets with the same type and same power and even the generator sets with the same batch can be connected in a grid mode, and obviously, the grid connection technology cannot meet the current requirements.
Therefore, there is a need to develop a system and a method for managing grid connection of a generator set, so as to realize the grid connection function of generator sets with different models and different power levels.
Disclosure of Invention
In view of the above, the invention provides a grid-connected management system and method for generator sets of different types, which realizes the grid-connected function of the generator sets of different types and different powers and reduces the complexity of grid-connected operation.
In a first aspect, the present application provides a grid-connected management system for generator sets of different models, including: the system comprises a grid-connected controller, at least two generator sets with different models, a grid-connected bus and a power grid, wherein rated powers of the at least two generator sets are different;
the power grid comprises a first output bus and a second output bus, and the first output bus and the second output bus are coupled through a first switch unit; the grid-connected controller is electrically connected with the first output bus through a first sensor and is used for acquiring the electrical information of the first output bus through the first sensor; the grid-connected controller is electrically connected with the second output bus through a second sensor and is used for acquiring the electrical information of the second output bus through the second sensor;
the grid-connected controller is electrically connected with the grid-connected bus through a third sensor and is used for acquiring the electrical information of the grid-connected bus through the third sensor;
The controllers of the generator sets are respectively and electrically connected with the grid-connected controllers through different first signal buses, and the output ends of the generator sets are respectively and electrically connected with the grid-connected buses through different second switch units;
The controllers of the generator sets are also respectively and electrically connected with the grid-connected buses through different fourth sensors, and the generator sets acquire the electrical information of the grid-connected buses through the fourth sensors;
the output end of the grid-connected bus and the second output bus of the power grid are respectively coupled with a load.
Optionally, wherein: the electrical information includes voltage, frequency and phase.
Optionally, wherein: and the output end of the grid-connected bus is coupled with the load through a third switch unit.
Optionally, wherein: the number of the generator sets is 2-10, and rated power of each generator set is different; when each generator set is electrically connected with the grid-connected bus, the generator set with the largest rated power keeps constant voltage output, and other generator sets keep constant power output.
Optionally, wherein: at least part of the controllers of the generator sets are electrically connected with the first signal bus through an interface converter.
In a second aspect, the application provides a grid-connected management method of generator sets with different types, which is applied to a grid-connected management system of the generator sets with different types, wherein the method comprises a first power supply state and a second power supply state;
In the first power supply state, the first switch unit is conducted, and the power grid supplies power to a load through a first output bus and a second output bus; the output ends of the at least two generator sets are electrically connected with a grid-connected bus, the grid-connected bus is electrically connected with a load, and the output ends of the at least two generator sets supply power to the load through the grid-connected bus;
In the second power supply state, the first switch unit is turned off, the power grid does not supply power to the load, the output ends of the at least two generator sets are electrically connected with a grid-connected bus, the grid-connected bus is electrically connected with the load, and the output ends of the at least two generator sets supply power to the load through the grid-connected bus.
Optionally, wherein:
In the first power supply state, the output ends of the at least two generator sets are electrically connected with a grid-connected bus, the grid-connected bus is electrically connected with a load, and the output ends of the at least two generator sets supply power to the load through the grid-connected bus, specifically:
Setting at least two generator sets with the largest rated power as a main generator set and other generator sets as auxiliary generator sets;
The grid-connected controller obtains the electric information of the first output bus through the first sensor, and obtains the electric information of the main generator set through a first signal bus electrically connected with the main generator set, wherein the electric information comprises voltage, frequency and phase; when the electric information output by the main generator set is completely consistent with the electric information of the first output bus, the grid-connected controller sends a control instruction to the main generator set to control a second switch unit electrically connected with the main generator set to be conducted;
Each auxiliary generator set respectively acquires the electric information of the grid-connected bus through a fourth sensor, and when the electric information of the auxiliary generator set is completely consistent with the electric information of the grid-connected bus, a second switch unit electrically connected with the auxiliary generator set is controlled to be conducted so that the output end of the auxiliary generator set is electrically connected with the grid-connected bus;
When the second switch units connected with the main generator set and the auxiliary generator sets are all conducted, the grid-connected controller obtains the electric information of the grid-connected bus and the second output bus through the third sensor and the second sensor respectively, and when the electric information of the grid-connected bus and the electric information of the second output bus are completely consistent, the grid-connected controller controls the third switch units electrically connected with the output ends of the grid-connected bus to be conducted, so that the main generator set and the auxiliary generator sets supply power to loads simultaneously.
Optionally, wherein:
And in the first power supply state and the second power supply state, according to a power distribution method of the generator set, the main generator set keeps constant-voltage output, the output current of the main generator set changes along with the change of a load, and each auxiliary generator set keeps constant-power output.
Optionally, wherein:
the power distribution method of the generator set comprises the following steps:
The grid-connected controller automatically monitors and outputs the total load power in real time;
subtracting half of rated power of the main generator set from the total load power to serve as residual load power;
And distributing the residual load power to each auxiliary generator set according to the rated power of each auxiliary generator set.
Optionally, wherein:
Further comprises:
the grid-connected controller monitors the change condition of the total load in real time;
When the total load is monitored to be increased and the load rate of the main generator set is greater than 80% of the rated power of the main generator set, the grid-connected controller sends an instruction to each auxiliary generator set through the first signal bus, controls each auxiliary generator set to increase the output power according to the respective rated power and keep constant power operation, and enables the load rate of the main generator set to be maintained within the range of 30% -80% of the rated power of the main generator set;
When the total load is monitored to be reduced and the load rate of the main generator set is less than 30% of the rated power of the main generator set, the grid-connected controller sends an instruction to each auxiliary generator set through the first signal bus, controls each auxiliary generator set to reduce the output power according to the respective rated power and keep constant power operation, and enables the load rate of the main generator set to be maintained within the range of 30% -80% of the rated power of the main generator set;
When the load rate of each auxiliary generator set is monitored to be less than 30% of the rated power of the auxiliary generator set, the grid-connected controller sends a shutdown command to one auxiliary generator set, and controls the corresponding second switch units of the auxiliary generator set to be disconnected, so that the load rate of other auxiliary generator sets is maintained within the range of 50% -75% of the rated power of the auxiliary generator set;
When the total load is monitored to be increased and the load rate of the main generator set is greater than 80% of the rated power of the main generator set, the grid-connected controller sends a starting instruction to the auxiliary generator set which stops running, controls the auxiliary generator set to start, and runs with constant power according to the load proportion distributed by the grid-connected controller.
Compared with the prior art, the grid-connected management system and method for the generator sets with different models at least realize the following beneficial effects:
In the grid-connected management system and method for the generator sets with different types, at least two generator sets with different types are connected in a grid through the grid-connected bus by the grid-connected controller, and rated powers of the at least two generator sets are different. The grid-connected controller can monitor the electrical information on the first output bus and the second output bus in the power grid, and can monitor the electrical information on the grid-connected bus. The controllers of the generator sets can also monitor the electrical information on the grid-connected bus. In a first power supply state, under the control of a grid-connected controller, at least two generator sets with different models are connected in parallel with a power grid, the power grid and the at least two generator sets supply power to a load at the same time, and the situation is particularly suitable for situations that temporary and short-time capacity gaps can occur in power consumption peaks of the power grid capacity in winter or summer, and the at least two generator sets can compensate the capacity gaps of the power grid. In the second power supply state, the power grid does not supply power to the load, and the grid-connected controller controls a power supply network formed by at least two generator sets to supply power to the load. According to the invention, the automatic monitoring and grid connection functions of the generator sets with different types and different powers are realized through the grid connection controller, and the problem that the generator sets with different types and different powers cannot be connected in the prior art is solved.
Of course, it is not necessary for any one product embodying the invention to achieve all of the technical effects described above at the same time.
Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic structural diagram of a grid-connected management system of a generator set with different models according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for grid-tie management of a generator set with different signals according to the present invention;
FIG. 3 is a flow chart illustrating the grid connection of a generator set;
fig. 4 is a flowchart of a method for distributing power of a generator set according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
The following detailed description will proceed with reference being made to the drawings and detailed description of embodiments.
Fig. 1 is a schematic structural diagram of a grid-connected management system for a generator set with different types, which is provided by an embodiment of the present invention, please refer to fig. 1, and the grid-connected management system for a generator set with different types provided by the present invention includes: the system comprises a grid-connected controller 10, at least two generator sets 20 with different models, a grid-connected bus 30 and a power grid 40, wherein rated powers of the at least two generator sets 20 are different;
The power grid 40 includes a first output bus L1 and a second output bus L2, and the first output bus L1 and the second output bus L2 are coupled through a first switch unit K1; the grid-connected controller 10 is electrically connected with the first output bus L1 through a first sensor Q1, and the grid-connected controller 10 is configured to obtain electrical information of the first output bus L1 through the first sensor Q1; the grid-connected controller 10 is electrically connected with the second output bus L2 through a second sensor Q2, and the grid-connected controller 10 is configured to obtain electrical information of the second output bus L2 through the second sensor Q2;
The grid-connected controller 10 is electrically connected with the grid-connected bus 30 through a third sensor Q3, and the grid-connected controller 10 is used for acquiring the electrical information of the grid-connected bus 30 through the third sensor Q3;
The controllers of the generator sets 20 are respectively and electrically connected with the grid-connected controller 10 through different first signal buses X1, and the output ends of the generator sets 20 are respectively and electrically connected with the grid-connected buses 30 through different second switch units K2;
The controllers of the generator sets 20 are also respectively and electrically connected with the grid-connected bus 30 through different fourth sensors Q4, and the generator sets 20 acquire the electrical information of the grid-connected bus 30 through the fourth sensors Q4;
The output of the grid-connected bus 30 and the second output bus L2 of the grid 40 are each coupled to a load.
It should be noted that the type of the generator referred to in the present invention is the type of the generator defined in the prior art. For example, the turbogenerator produced in China has QFQ, QFN, QFS series, the first two letters represent turbogenerators, the third letter represents cooling mode, Q represents hydrogen external cooling, N represents hydrogen internal cooling, and S represents double water internal cooling. The large-scale hydro-generator produced in China is TS series, T represents synchronization, and S represents a water wheel. For example, QFS-300-3 represents a double water cooled 2 pole turbo generator with a capacity of 300 MW. TSS1264/160-48 represents a double water cooled hydro-generator with a stator outer diameter of 1264 cm, a core length of 160 cm and a pole count of 48.
It should be further noted that, grid connection refers to connecting at least two generator sets with different models to the grid connection bus 30 to supply power to the load, where the multiple generator sets 20 may supply power to the load together with the power grid 40, and the multiple generator sets 20 may also supply power to the load separately. The first sensor, the second sensor, the third sensor and the fourth sensor mentioned in the present invention are all electrical sensors capable of sensing signals of voltage, current, frequency and waveform (phase).
Specifically, fig. 1 shows 5 generator sets 20 connected to the grid-connected controller 10, which are a-type generator set, B-type generator set, C-type generator set, D-type generator set, and E-type generator set, respectively. Alternatively, 5 gensets 20 may be different in model number and power rating. The figure only illustrates that the model numbers and rated powers of 5 generator sets 20 are different, and in other embodiments of the present invention, the number of generator sets 20 connected to the grid-connected controller 10 may be at least two. In addition, when there are more than two power generating sets 20 connected to the grid-connected controller 10, the present invention is not particularly limited as long as there are at least two power generating sets 20 of different types and at least two power generating sets 20 of different rated powers. Fig. 1 shows only 5 different rated powers corresponding to 5 gensets 20, and is not limited to the actual rated powers of the gensets 20, and in other embodiments of the present invention, gensets 20 with various powers may be selected according to actual situations.
Referring to fig. 1, each generator set 20 includes a corresponding controller, each generator set 20 is electrically connected to the grid-connected controller 10 through the corresponding controller, that is, the controller of each generator set 20 is electrically connected to the grid-connected controller 10 through different first signal buses X1, so that each generator set 20 can implement information interaction with the grid-connected controller 10. The output end of each generator set 20 is also electrically connected with the grid-connected bus 30 through different second switch units K2, when the second switch units K2 are closed, the corresponding generator set 20 is electrically connected with the grid-connected bus 30, and signals output by the generator sets 20 are transmitted to the grid-connected bus 30. In addition, the controller of each generator set 20 is further electrically connected to the grid-connected bus 30 through different fourth sensors Q4, the generator set 20 may obtain the electrical information on the grid-connected bus 30 through the corresponding fourth sensor Q4, for example, when a certain generator set 20 needs to be electrically connected to the grid-connected bus 30, the generator set 20 may first obtain the electrical information on the grid-connected bus 30 through the corresponding fourth sensor Q4, and when the electrical information of the generator set 20 is completely the same as the electrical information on the grid-connected bus 30, the second switch unit K2 between the generator set 20 and the grid-connected bus 30 is controlled to be closed, so that the generator set 20 is smoothly connected to the grid.
In the grid-connected management system for the generator sets 20 with different models, at least two generator sets 20 with different models are connected in a grid through the grid-connected bus 30 by the grid-connected controller 10, and rated powers of the at least two generator sets 20 are different. The grid-tie controller 10 is capable of monitoring the electrical information on the first output bus L1 and the second output bus L2 in the grid 40, while being capable of monitoring the electrical information on the grid-tie bus 30. The controller of each genset 20 is also able to monitor the electrical information on the grid-tie bus 30. In the first power supply state, under the control of the grid-connected controller 10, at least two generator sets 20 with different models are connected in parallel with the power grid 40, the power grid 40 and the at least two generator sets 20 supply power to the load simultaneously, and the situation is particularly suitable for the situation that temporary and short-time capacity gaps can occur in the power consumption peak of the capacity of the power grid 40 in winter or summer, and the capacity gaps of the power grid 40 can be compensated by the at least two generator sets 20. In the second power supply state, the power grid 40 does not supply power to the load, and the grid-connected controller 10 controls the power supply network formed by at least two generator sets 20 to supply power to the load, so that the power grid is particularly suitable for ensuring normal power consumption of a user under the condition that the power grid 40 is in power failure or power failure overhauling. The invention realizes the automatic monitoring and grid connection functions of the generator sets 20 with different models and different powers through the grid connection controller 10, and solves the problem that the generator sets 20 with different models and different powers cannot realize grid connection in the prior art.
Optionally, the grid-connected controller 10 provided by the present invention may include a high-speed a/D converter, a memory chip, a signal processing circuit, a driving circuit, an actuator, and the like.
In an alternative embodiment of the present invention, please continue to refer to fig. 1, the electrical information includes voltage, frequency and phase. During the grid-tie process, the grid-tie controller 10 can track, synchronize, phase lock the voltage, frequency, phase and other electrical information of the grid 40, and then the grid-tie controller 10 directs the generator set 20 with the largest power in the micro-grid (the generator set 20 connected to the grid-tie controller 10 in the grid-tie management system) to track the electrical information. Taking fig. 1 as an example, the generator set 20 with the largest rated power is an E-type generator set, when the voltage, frequency and phase output by the E-type generator set are completely consistent with those of the power grid 40, the grid-connected controller 10 gives an instruction to the controller of the E-type generator set, the controller driving circuit of the E-type generator set acts to close the second switch unit K2 electrically connected with the E-type generator set, so that the process of grid-connecting the E-type generator set is realized. When the voltage, frequency and phase of the generator set 20 to be connected to the grid are completely consistent with the voltage, frequency and phase of the grid 40, it is beneficial to avoid the phenomenon of abnormal power supply caused by the connection of the generator sets 20 with non-identical electrical information.
In an alternative embodiment of the present invention, please continue to refer to fig. 1, the output end of the grid-connected bus 30 is coupled to the load through the third switch unit K3.
Specifically, the output end of the grid-connected bus 30 is coupled to the load through the third switch unit K3, optionally, when the micro-grid formed by the generator sets 20 is needed to supply power to the load together in the process of supplying power to the load by the grid 40, after at least two generator sets 20 are connected to the grid-connected bus 30, the grid-connected controller 10 can obtain the electrical information of the grid-connected bus 30 through the third sensor Q3, and can obtain the electrical information of the grid 40 through the second sensor Q2, and when the electrical information of the two electrical information are completely consistent, the grid-connected controller 10 can control the third switch unit K3 to be closed, so that the grid-connected bus 30 is electrically connected with the load, and smooth power supply of the generator sets 20 and the grid 40 to the load is realized.
In an alternative embodiment of the present invention, the number of the generator sets 20 is 2-10, and the rated power of each generator set 20 is different; when each of the generator sets 20 is electrically connected to the grid-connected bus 30, the generator set 20 with the largest rated power maintains constant voltage output, and other generator sets 20 maintain constant power output.
Specifically, in the grid-connected management system provided by the present invention, the number of the generator sets 20 (i.e. the number of the generator sets 20 included in the micro-grid) used for connecting to the grid-connected bus 30 may be selected to be 2-10, for example, 3-8, etc. according to the requirement, and the embodiment of the present invention is only illustrated by taking 5 as an example. The rated power of each generator set 20 is different, the generator set 20 with the largest rated power is selected by the generator set 20 to be connected in the micro-grid to perform constant-voltage operation, and the current output of the generator set is changed along with the load change; the other generator sets 20 output a constant current in proportion to the magnitude of their own power, i.e., maintain a constant power output. In this way, the generator set 20 with the largest rated power in the micro-grid is used as the main generator set 21, the other generator sets 20 are used as the auxiliary generator sets 22, and the whole output of the grid-connected bus is kept stable under the control of the grid-connected controller 10, so that the whole system can supply power to a load stably.
In an alternative embodiment of the present invention, at least a portion of the controller of the genset 20 is electrically connected to the first signal bus X1 through an interface converter.
Specifically, considering that the types of the generator sets 20 in the micro-grid are not completely the same, the connection interfaces of the generator sets 20 and the grid-connected controller 10 are not completely the same, at this time, an interface converter is introduced between the first signal bus X1 and the controller of the generator sets 20, so that the first signal bus X1 is electrically connected with the controller of the generator sets 20 through the interface converter, and therefore, the grid-connected of the generator sets 20 with different types and different interfaces to the grid-connected bus 30 is realized, the grid-connected management system provided by the invention can be compatible with the generator sets 20 with different types, the requirement that the types of the generator sets 20 in the grid-connected management system in the prior art must be unified is broken, and the grid-connected management system provided by the invention has stronger compatibility and stronger practicability.
Based on the same inventive concept, the present invention further provides a grid-connected management method of the generator set 20 with different types, which is applied to the grid-connected management system of the generator set 20 with different types provided by the embodiment of the present invention, fig. 2 is a flowchart of a grid-connected management method of the generator set 20 with different signals provided by the present invention, and please combine fig. 1 and fig. 2, where the method includes a first power supply state and a second power supply state;
In the first power supply state, the first switch unit K1 is turned on, and the power grid 40 supplies power to the load through the first output bus L1 and the second output bus L2; the output ends of the at least two generator sets 20 are electrically connected with a grid-connected bus 30, the grid-connected bus 30 is electrically connected with a load, and the output ends of the at least two generator sets 20 supply power to the load through the grid-connected bus 30;
In the second power supply state, the first switch unit K1 is turned off, the power grid 40 does not supply power to the load, the output ends of the at least two generator sets 20 are electrically connected with the grid-connected bus 30, the grid-connected bus 30 is electrically connected with the load, and the output ends of the at least two generator sets 20 supply power to the load through the grid-connected bus 30.
Specifically, in the grid-connected management method of the generator set 20 with different signals provided by the invention, the grid-connected management system can be controlled to select two different power supply states according to different requirements. Under the control of the grid-connected controller 10, at least two generator sets 20 with different models are connected in parallel with the power grid 40, the power grid 40 and the at least two generator sets 20 supply power to loads simultaneously, and the situation is particularly suitable for situations that temporary and short-time capacity gaps can occur in power consumption peaks of the capacity of the power grid 40 in winter or summer, and the capacity gaps of the power grid 40 can be compensated by the at least two generator sets 20. In the second power supply state, the power grid 40 does not supply power to the load, and the grid-connected controller 10 controls the power supply network formed by at least two generator sets 20 to supply power to the load, so that the power grid is particularly suitable for ensuring normal power consumption of a user under the condition that the power grid 40 is in power failure or power failure overhauling. The grid-connected management method of the generator sets 20 with different signals provided by the invention realizes the automatic monitoring and grid-connected functions of the generator sets 20 with different types and different powers, and solves the problem that the generator sets 20 with different types and different powers cannot realize grid connection in the prior art.
In an alternative embodiment of the present invention, please refer to fig. 1 and 3, fig. 3 is a flowchart showing a process of grid-connecting the generator sets 20, in the first power supply state, the output ends of the at least two generator sets 20 are electrically connected to a grid-connected bus 30, the grid-connected bus 30 is electrically connected to a load, and the output ends of the at least two generator sets 20 supply power to the load through the grid-connected bus 30, specifically:
And S01, setting at least two generator sets 20 with the largest rated power among the generator sets 20 as a main generator set 21, and setting other generator sets 20 as auxiliary generator sets 22.
Alternatively, taking the grid-connected management system in fig. 1 as an example, the rated power of the E-type generator set is 3000KW, and is the generator set 20 with the largest rated power in the micro-grid, so the E-type generator set is used as the main generator set 21, and the rated powers of the other generator sets 20 are smaller than those of the E-type generator sets, so the other generator sets are used as the auxiliary generator sets 22.
S02, the grid-connected controller 10 obtains electric information of the first output bus L1 through the first sensor Q1, and obtains electric information of the main generator set 21 through a first signal bus X1 electrically connected with the main generator set 21, wherein the electric information comprises voltage, frequency and phase; when the electrical information output by the main generator set 21 is completely consistent with the electrical information of the first output bus L1, the grid-connected controller 10 sends a control command to the main generator set 21 to control the second switch unit K2 electrically connected to the main generator set 21 to be turned on. In this way, the main generator set 21 (i.e. corresponding to the E-type generator set in fig. 1) is first electrically connected to the grid-connected bus 30, and at this time, the electrical information on the grid-connected bus 30 is consistent with the electrical information output by the main generator set 21. When the second switching unit K2 corresponding to the main generator set 21 is not turned on, the grid-connected controller 10 sends the electrical information of the power grid 40 to the main generator set 21 at regular intervals (e.g., 10 ms).
S03, each auxiliary generator set 22 obtains the electrical information of the grid-connected bus 30 through a fourth sensor Q4, and when the electrical information of the auxiliary generator set 22 is completely consistent with the electrical information of the grid-connected bus 30, a second switch unit K2 electrically connected with the auxiliary generator set 22 is controlled to be conducted, so that the output end of the auxiliary generator set 22 is electrically connected with the grid-connected bus 30.
To ensure the power supply capacity of the whole power supply network, at least one auxiliary generator set 22 is connected to the grid-connected bus 30 in addition to the main generator set 21 and the grid-connected bus 30. The connection process of the auxiliary generator set 22 to the grid-connected bus 30 is performed after the main generator set 21 is connected to the grid-connected bus 30. When the electrical information of the auxiliary generator set 22 is completely consistent with the electrical information of the grid-connected bus 30, the second switch unit K2 electrically connected with the auxiliary generator set 22 can be controlled to be turned on, so that the stability of the electrical information of the grid-connected bus 30 is maintained, and the stability of final power supply is further ensured.
S04, when the second switch units K2 connected to the main generator set 21 and the auxiliary generator sets 22 are all turned on, the grid-connected controller 10 obtains the electrical information of the grid-connected bus 30 and the second output bus L2 through the third sensor Q3 and the second sensor Q2, respectively, and when the electrical information of the grid-connected bus 30 and the electrical information of the second output bus L2 are completely consistent, the grid-connected controller 10 controls the third switch unit K3 electrically connected to the output end of the grid-connected bus 30 to be turned on, so that the main generator set 21 and the auxiliary generator sets 22 supply power to the load simultaneously.
After the main generator set 21 and the auxiliary generator set 22 in the micro-grid are connected to the grid-connected bus 30, the grid-connected controller 10 monitors the electrical information of the grid-connected bus 30 again, monitors the electrical information of the second output bus L2 connected with the power grid 40, and can control the third switch unit K3 to be turned on when the electrical information of the main generator set 21 and the auxiliary generator set are completely consistent, so that the grid-connected bus 30 is electrically connected with a load, and the generator set 20 and the power grid 40 in the micro-grid supply power to the load simultaneously. Meanwhile, because the electric information in the grid-connected bus 30 is completely consistent with the electric information provided by the power grid 40, the power consumption user does not feel the phenomenon of abnormal power supply, and therefore stable supply of power supply to the load is facilitated.
It should be noted that, in the grid-connected management method provided by the present invention, the on and off processes of the second switch unit K2 electrically connected to the main generator set 21 or the auxiliary generator set 22 are automatically controlled by the grid-connected controller 10, and no manual intervention is required, so that the operation complexity of the grid-connected system is simplified, and huge loss caused by misoperation of staff is avoided.
In an alternative embodiment of the present invention, in the first power supply state and the second power supply state, according to the power distribution method of the generator set 20, the main generator set 21 is kept at a constant voltage output, and the output current of the main generator set 21 varies with the load, and each of the auxiliary generator sets 22 is kept at a constant power output.
Specifically, in the grid-connected management system provided by the present invention, the number of the generator sets 20 (i.e. the number of the generator sets 20 included in the micro-grid) used for connecting to the grid-connected bus 30 may be selected to be 2-10, for example, 3-8, etc. according to the requirement, and the embodiment of the present invention is only illustrated by taking 5 as an example. The rated power of each generator set 20 is different, the generator set 20 with the largest rated power is selected by the generator set 20 to be connected in the micro-grid to perform constant-voltage operation, and the current output of the generator set is changed along with the load change; the other generator sets 20 output a constant current in proportion to the magnitude of their own power, i.e., maintain a constant power output. In this way, the generator set 20 with the largest rated power in the micro-grid is used as the main generator set 21, the other generator sets 20 are used as the auxiliary generator sets 22, and the whole output of the grid-connected bus is kept stable under the control of the grid-connected controller 10, so that the whole system can supply power to a load stably.
Because the power of each generator set is different, as shown by the formula R=U 2/W, the internal resistance of each generator set is different, when the load fluctuates, the negative feedback coefficient in the automatic control system of each generator set is different, if each generator set works in an automatic voltage stabilizing mode, the time and amplitude of each generator set which are adjusted along with the change of the load are different, the system voltage oscillation is very easy to generate, the generator set is continuously and automatically adjusted between overhigh and overlow, the generator set is separated (automatic off-grid) in severe cases, and once one generator set is separated, other generator sets are possibly overloaded, and the micro grid is paralyzed; when the constant current running, the output of the unit is not affected by the load, and the stable power is output into the network, so that the unit is stable in running. When only one unit is kept for voltage stabilizing operation, the unit can automatically adjust along with load change, automatically damp when the adjusting range is overlarge, automatically improve the rising rate when the adjusting range is overlarge, and keep normal operation as long as the load is suddenly added and suddenly reduced by not more than 50% of rated power of the unit. It should be noted that, the "unit" mentioned in the present invention represents a "generator unit".
In an alternative embodiment of the present invention, please refer to fig. 4, fig. 4 is a flowchart illustrating a method for distributing power of a generator set 20 according to an embodiment of the present invention, where the method for distributing power of the generator set 20 includes:
S11, the grid-connected controller 10 automatically monitors and outputs the total load power in real time;
s12, subtracting half of rated power of the main generator set 21 from the total load power to serve as residual load power;
and S13, distributing the residual load power to each auxiliary generator set 22 according to the size proportion of the rated power of each auxiliary generator set 22.
Specifically, the 5 gensets 20 shown in fig. 1 will be described as an example, and the total rated power ppad=1200+800+1000+1600+3000=7600 KW of the 5 gensets 20. Suppose the required load power at the point of access is 5000W. The rated power of the main generator set 21, which is the total load power minus half, is 5000-3000/2=3500W, which 3500W corresponds to the residual load power. The ratio between the total rated power and the residual load power corresponding to the auxiliary generator set 22 is: (7600-3000)/3500=1.31, the power allocated to each auxiliary generator set 22 is p=pe/1.31 (where Pe represents the rated power of the auxiliary generator set 22), so that the power pa=1200/1.31 allocated to the a-type generator set, the power pb=800/1.31 allocated to the b-type generator set, the power pc=1000/1.31 allocated to the c-type generator set, the power allocated to the d-type generator set is 1600/1.31, and the units of the above powers are KW. The power is distributed to the main generator set 21 and each auxiliary generator set 22 in the above manner, and as the heat dissipation design of each set is strictly related to the operation power thereof, the operation balance of each set must be considered when a plurality of sets are operated in parallel, and each set is distributed in the above manner, so that a proper amount of margin of comparison is reserved, the operation is balanced and stable, and the continuous parallel operation can be realized for a long time, such as continuous operation for 24 hours.
In an alternative embodiment of the present invention, the grid-connected management method for the generator sets 20 with different models provided by the present invention further includes:
The grid-connected controller 10 monitors the change condition of the total load in real time;
When the total load is monitored to be increased and the load factor of the main generator set 21 is greater than 80% of the rated power of the main generator set 21, the grid-connected controller 10 sends a command to each auxiliary generator set 22 through the first signal bus X1, controls each auxiliary generator set 22 to increase the output power according to the respective rated power and keep constant power operation, and enables the load factor of the main generator set 21 to be maintained within the range of 30% -80% of the rated power of the main generator set 21. When the load rated power of the main generator set 21 is greater than 80% of the rated power thereof, the grid-connected controller 10 controls the auxiliary generator sets 22 to increase the output power, and the increase of the output power of each auxiliary generator set 22 can be distributed by referring to the power distribution method of the generator set 20, so that the output power of the main generator set 21 is kept below 80% of the rated power thereof. Alternatively, the output power of main genset 21 is maintained at around 50% of its rated power.
When the total load is monitored to be reduced and the load factor of the main generator set 21 is less than 30% of the rated power of the main generator set 21, the grid-connected controller 10 sends a command to each auxiliary generator set 22 through the first signal bus X1, controls each auxiliary generator set 22 to reduce the output power according to the respective rated power and keep constant power operation, and enables the load factor of the main generator set 21 to be maintained within the range of 30% -80% of the rated power of the main generator set 21. When the load factor of the main generator is reduced to less than 30% of the rated power thereof, the grid-connected controller 10 controls each auxiliary generator set 22 to reduce the output power, and the reduction amount of the output power of each auxiliary generator set 22 can be distributed by referring to the power distribution method of the generator set 20, so that the output power of the main generator set 21 is maintained above 30%.
When the load rate of each auxiliary generator set 22 is monitored to be less than 30% of the rated power of the auxiliary generator set, the grid-connected controller 10 sends a shutdown command to one auxiliary generator set 22, and controls the second switch unit K2 corresponding to the auxiliary generator set 22 to be disconnected, so that the load rate of other auxiliary generator sets 22 is maintained within the range of 50% -75% of the rated power of the auxiliary generator set. Optionally, when the load rate of each auxiliary generator set 22 is less than 30% of its rated power, the grid-connected controller 10 sends a shutdown command to the generator set 20 with a central capacity (rated power) in the auxiliary generator sets 22 running in the micro-grid, and the other generator sets 20 run normally, so that the load rate of the other auxiliary generator sets 22 is maintained within the range of 50% -75% of its rated power. The consideration of selecting the generator set 20 with the central capacity is that if the auxiliary generator set 22 with the smallest capacity is selected to stop, the load rate of other auxiliary generator sets 22 may not be adjusted to 50% -75% of the rated power of the auxiliary generator set, and other auxiliary generator sets 22 need to be selected to stop to achieve the effect. If the auxiliary generator set 22 with the largest capacity is selected to stop, the load rate of other auxiliary generator sets 22 may exceed 75%, and thus the stopped generator set 20 may need to be connected in grid. Therefore, the invention selects the capacity-centered auxiliary generator set 22 to stop, avoids the frequent stop or grid connection work of the auxiliary generator set 22 of the grid connection management system, and reduces the fluctuation of the power supply network as much as possible.
When the total load is monitored to be increased and the load rate of the main generator set 21 is greater than 80% of the rated power of the main generator set 21, the grid-connected controller 10 sends a starting instruction to the auxiliary generator set 22 which stops running, controls the auxiliary generator set 22 to start, and runs with constant power according to the load proportion distributed by the grid-connected controller 10. After a certain auxiliary generator set 22 in the micro-grid is shut down, if the total load is increased and the load rate of the main generator set 21 is greater than 80% of the rated power, the grid-connected controller 10 will automatically send a start command to the shut down auxiliary generator set 22 to make it electrically connected with the grid-connected bus 30, thereby reducing the load rate of the main generator set 21.
Optionally, the embodiment of the present invention in which the grid-connected controller 10 controls the auxiliary generator set 22 to stop refers to that the grid-connected controller 10 controls the second switching unit K2 between the auxiliary generator set 22 and the grid-connected bus 30 to be turned off, so that the auxiliary generator set 22 no longer outputs electrical information to the grid-connected bus 30. The grid-connected controller 10 in the embodiment of the present invention controls the auxiliary generator set 22 to start, which means that the grid-connected controller 10 controls the second switch unit K2 between the auxiliary generator set 22 and the grid-connected bus 30 to be closed, so that the auxiliary generator set 22 is conducted with the grid-connected bus 30, and the power information is transmitted to the grid-connected bus 30. Before the generator set 20 for controlling shutdown is conducted with the grid-connected bus 30, the grid-connected controller 10 first monitors whether the electrical information of the auxiliary generator set 22 is consistent with the electrical information on the grid-connected bus 30, and if so, the auxiliary generator set 22 can be conducted with the grid-connected bus 30.
In the grid-connected operation, before the generator sets 20 are electrically connected to the grid-connected bus 30, the grid-connected controller 10 monitors whether the electrical information on each generator set 20 is consistent with the electrical information on the grid-connected bus 30 or the electrical information on the grid 40, and the grid-connected operation can be performed by the consistency. Optionally, each generator set 20 is provided with an automatic voltage regulator and an automatic speed regulator, when the electrical information of the generator set 20 is inconsistent with the electrical information of the grid-connected bus 30 or the electrical network 40, the generator set 20 can regulate the electrical information of itself, for example, the voltage can be finely regulated by the automatic voltage regulator, the frequency can be finely regulated by the automatic speed regulator, the phase can adopt a waveform comparison method, that is, when the time sequence waveforms of the generator set 20 and the sine wave of the mains supply are completely coincident, the second switch unit K2 is controlled to be closed.
Referring to fig. 1, when the power grid and the micro-grid supply power to the liability at the same time, the grid-connected controller 10 sends out an instruction to switch the first switch unit K1 off (i.e. to switch off), the system becomes island operation (i.e. only the generator set in the micro-grid supplies power to the load), the grid-connected controller 10 still keeps constant voltage output of the main generator set (the E-type generator set in the corresponding diagram) according to a preset principle, the output power changes along with the load change, the auxiliary generator set runs with constant power according to the distribution ratio calculated in real time by the grid-connected controller, the main generator set is equivalent to the position of bearing the power grid, and the grid-connected controller and the auxiliary generator set both take the main generator set as tracked objects, and the main generator set leads synchronization and phase locking to keep the grid-connected management system to run stably.
When the mains supply of the power grid is recovered, the grid-connected controller automatically monitors the voltage, the frequency and the phase of the mains supply through the first sensor Q1, compares the three parameters with the three parameters monitored by the third sensor Q3, and when the three parameters are deviated, fine-adjusts the parameter information of the generator set, and only when the three parameters detected by the first sensor Q1 and the third sensor Q3 are completely consistent, the grid-connected controller sends a switching-on instruction to the first switch unit K1, and the mains supply and the generator set are subjected to grid-connected power supply after the first switch unit K1 is successfully switched on.
When the capacity of the power grid meets the customer load, the power grid takes precedence, and the generator set can be used as emergency guarantee; when the capacity of the power grid is in winter or Xia Gaofeng, a temporary short-time capacity gap can be generated, and the standby generator set can be used as emergency supplement; in the network topology structure shown in fig. 1, at this time, the power grid load can be output at maximum, the generator set is supplemented in real time, the parallel operation controller detects the load real-time data through the second sensor and the third sensor, the running number of the generator set in the micro-grid is adjusted in time through analysis and judgment, the generator set is started or closed in time according to the field requirement, and the benefit is kept maximized.
In summary, the grid-connected management system and method for the generator sets with different models provided by the invention at least realize the following beneficial effects:
In the grid-connected management system and method for the generator sets with different types, at least two generator sets with different types are connected in a grid through the grid-connected bus by the grid-connected controller, and rated powers of the at least two generator sets are different. The grid-connected controller can monitor the electrical information on the first output bus and the second output bus in the power grid, and can monitor the electrical information on the grid-connected bus. The controllers of the generator sets can also monitor the electrical information on the grid-connected bus. In a first power supply state, under the control of a grid-connected controller, at least two generator sets with different models are connected in parallel with a power grid, the power grid and the at least two generator sets supply power to a load at the same time, and the situation is particularly suitable for situations that temporary and short-time capacity gaps can occur in power consumption peaks of the power grid capacity in winter or summer, and the at least two generator sets can compensate the capacity gaps of the power grid. In the second power supply state, the power grid does not supply power to the load, and the grid-connected controller controls a power supply network formed by at least two generator sets to supply power to the load. According to the invention, the automatic monitoring and grid connection functions of the generator sets with different types and different powers are realized through the grid connection controller, and the problem that the generator sets with different types and different powers cannot be connected in the prior art is solved.
While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (8)
1. A grid-tie management system for generator sets of different models, comprising: the system comprises a grid-connected controller, at least two generator sets with different models, a grid-connected bus and a power grid, wherein rated powers of the at least two generator sets are different;
the power grid comprises a first output bus and a second output bus, and the first output bus and the second output bus are coupled through a first switch unit; the grid-connected controller is electrically connected with the first output bus through a first sensor and is used for acquiring the electrical information of the first output bus through the first sensor; the grid-connected controller is electrically connected with the second output bus through a second sensor and is used for acquiring the electrical information of the second output bus through the second sensor;
the grid-connected controller is electrically connected with the grid-connected bus through a third sensor and is used for acquiring the electrical information of the grid-connected bus through the third sensor;
The controllers of the generator sets are respectively and electrically connected with the grid-connected controllers through different first signal buses, and the output ends of the generator sets are respectively and electrically connected with the grid-connected buses through different second switch units;
The controllers of the generator sets are also respectively and electrically connected with the grid-connected buses through different fourth sensors, and the generator sets acquire the electrical information of the grid-connected buses through the fourth sensors;
the output end of the grid-connected bus and the second output bus of the power grid are respectively coupled with a load;
the electrical information includes voltage, frequency and phase;
The number of the generator sets is 2-10, and rated power of each generator set is different; when each generator set is electrically connected with the grid-connected bus, the generator set with the largest rated power keeps constant voltage output, and other generator sets keep constant power output.
2. The grid tie management system for a generator set of different model number according to claim 1, wherein the output of the grid tie bus is coupled to the load through a third switching unit.
3. The grid tie management system for a plurality of generator sets of claim 1, wherein at least a portion of the controllers of the generator sets are electrically connected to the first signal bus via an interface converter.
4. A grid-tie management method of a generator set of a different model, characterized in that it is applied to a grid-tie management system of a generator set of a different model as claimed in any one of claims 1 to 3, the method comprising a first power supply state and a second power supply state;
In the first power supply state, the first switch unit is conducted, and the power grid supplies power to a load through a first output bus and a second output bus; the output ends of the at least two generator sets are electrically connected with a grid-connected bus, the grid-connected bus is electrically connected with a load, and the output ends of the at least two generator sets supply power to the load through the grid-connected bus;
In the second power supply state, the first switch unit is turned off, the power grid does not supply power to the load, the output ends of the at least two generator sets are electrically connected with a grid-connected bus, the grid-connected bus is electrically connected with the load, and the output ends of the at least two generator sets supply power to the load through the grid-connected bus.
5. The grid-connected management method of generator sets with different models according to claim 4, wherein in the first power supply state, output ends of the at least two generator sets are electrically connected with a grid-connected bus, the grid-connected bus is electrically connected with a load, and the output ends of the at least two generator sets supply power to the load through the grid-connected bus, specifically:
Setting at least two generator sets with the largest rated power as a main generator set and other generator sets as auxiliary generator sets;
The grid-connected controller obtains the electric information of the first output bus through the first sensor, and obtains the electric information of the main generator set through a first signal bus electrically connected with the main generator set, wherein the electric information comprises voltage, frequency and phase; when the electric information output by the main generator set is completely consistent with the electric information of the first output bus, the grid-connected controller sends a control instruction to the main generator set to control a second switch unit electrically connected with the main generator set to be conducted;
Each auxiliary generator set respectively acquires the electric information of the grid-connected bus through a fourth sensor, and when the electric information of the auxiliary generator set is completely consistent with the electric information of the grid-connected bus, a second switch unit electrically connected with the auxiliary generator set is controlled to be conducted so that the output end of the auxiliary generator set is electrically connected with the grid-connected bus;
When the second switch units connected with the main generator set and the auxiliary generator sets are all conducted, the grid-connected controller obtains the electric information of the grid-connected bus and the second output bus through the third sensor and the second sensor respectively, and when the electric information of the grid-connected bus and the electric information of the second output bus are completely consistent, the grid-connected controller controls the third switch units electrically connected with the output ends of the grid-connected bus to be conducted, so that the main generator set and the auxiliary generator sets supply power to loads simultaneously.
6. The grid-connected management method of generator sets of different models according to claim 5, wherein in the first power supply state and the second power supply state, according to a generator set power distribution method, the main generator set is kept at constant voltage output, and the output current of the main generator set is changed along with the change of load, and each auxiliary generator set is kept at constant power output.
7. The grid-connected management method of generator sets with different models according to claim 6, wherein the power distribution method of the generator sets is as follows:
The grid-connected controller automatically monitors and outputs the total load power in real time;
subtracting half of rated power of the main generator set from the total load power to serve as residual load power;
And distributing the residual load power to each auxiliary generator set according to the rated power of each auxiliary generator set.
8. The grid-tie management method of generator sets of different models according to claim 7, further comprising:
the grid-connected controller monitors the change condition of the total load in real time;
When the total load is monitored to be increased and the load rate of the main generator set is greater than 80% of the rated power of the main generator set, the grid-connected controller sends an instruction to each auxiliary generator set through the first signal bus, controls each auxiliary generator set to increase the output power according to the respective rated power and keep constant power operation, and enables the load rate of the main generator set to be maintained within the range of 30% -80% of the rated power of the main generator set;
When the total load is monitored to be reduced and the load rate of the main generator set is less than 30% of the rated power of the main generator set, the grid-connected controller sends an instruction to each auxiliary generator set through the first signal bus, controls each auxiliary generator set to reduce the output power according to the respective rated power and keep constant power operation, and enables the load rate of the main generator set to be maintained within the range of 30% -80% of the rated power of the main generator set;
When the load rate of each auxiliary generator set is monitored to be less than 30% of the rated power of the auxiliary generator set, the grid-connected controller sends a shutdown command to one auxiliary generator set, and controls the corresponding second switch units of the auxiliary generator set to be disconnected, so that the load rate of other auxiliary generator sets is maintained within the range of 50% -75% of the rated power of the auxiliary generator set;
When the total load is monitored to be increased and the load rate of the main generator set is greater than 80% of the rated power of the main generator set, the grid-connected controller sends a starting instruction to the auxiliary generator set which stops running, controls the auxiliary generator set to start, and runs with constant power according to the load proportion distributed by the grid-connected controller.
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