CN212966176U - Experimental microgrid construction for verifying various microgrid structures - Google Patents
Experimental microgrid construction for verifying various microgrid structures Download PDFInfo
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Abstract
The utility model belongs to the technical field of little electric wire netting, especially, relate to a little electric wire netting of test that can be used to various little electric wire netting structure verification founds. The utility model discloses experimental type microgrid includes double bus structure and segment control structure, the utility model discloses can simulate and verify various microgrid structures, include that voltage circuit to 10kv adopts double bus structure, segment control to constitute experimental type microgrid, overcome the problem that traditional 10kv voltage circuit can only single bus structure's unicity and local limit type. The structure of the experimental microgrid can be adjusted according to different demonstration engineering projects so as to carry out simulation verification, and an optimal operation scheme is found by using a two-layer operation optimization method with an economic index as a bottom layer and an electric energy quality index as an upper layer, so that the experimental microgrid always operates in an optimal working state, and the system operates more reasonably.
Description
Technical Field
The utility model belongs to the technical field of little electric wire netting, especially, relate to a little electric wire netting of test that can be used to various little electric wire netting structure verification founds.
Background
With the utilization of new energy sources increasing more and more, micro-grids formed by distributed power sources are diversified more and more, and various micro-grid structures are derived. Although the micro-grid structure is various, the traditional micro-grid structure has the disadvantage of singleness, and fixed micro-grid structures are adopted in different areas such as remote mountainous areas, island areas and urban industrial and commercial parks. This is a significant impediment to the construction of the microgrid. The capacity of the micro-sources and the load in each micro-grid structure is fixed according to practical demonstration engineering, so that distributed power sources and loads with specified capacity may not be available in the platform verification process.
Disclosure of Invention
To the weak point that exists among the above-mentioned prior art, the utility model provides a can be used to the experimental little electric wire netting of various little electric wire netting structure verifications to construct. The utility model aims at providing a can carry out the little electric wire netting that simulates and verify to various little electric wire netting structures and construct to overcome the problem of the unicity and the local limit type that traditional 10kv voltage circuit can only single bus structure.
The utility model discloses a realize that the technical scheme that above-mentioned purpose adopted is:
the method can be used for constructing test micro-grids for verifying various micro-grid structures, and the test micro-grid comprises a double-bus structure and a segmented control structure; the test-type micro-grid double-bus structure comprises two buses, wherein a grid alternating current bus is connected with a photovoltaic, a fan and a load; the other test alternating current bus is connected with a photovoltaic, a fan, a super capacitor, a storage battery, a gas turbine, a diesel engine, RTLAB semi-physical equipment and a load;
the test type microgrid sectional control structure comprises a power grid alternating current bus, the power grid alternating current bus is divided into two sections in total, and a circuit breaker is arranged in the middle of the power grid alternating current bus; one section of power grid alternating current bus is connected with a super capacitor, a storage battery, a gas turbine, a diesel engine, RTLAB semi-physical simulation equipment and a simulation load; and the other section of power grid alternating current bus is connected with a photovoltaic and a fan.
The test type microgrid double-bus structure comprises: the photovoltaic is sequentially connected with variable line impedance through a DC/AC inverter and is respectively connected to a power grid alternating current bus and a test alternating current bus through the variable line impedance; the fan is connected with variable line impedance through the AC/DC rectifier and the inverter and then respectively connected to the power grid alternating current bus and the test alternating current bus through the variable line impedance; the load is connected to a power grid alternating current bus; the super capacitor is connected with variable line impedance through an inverter and then connected to a test alternating current bus; the storage battery is connected with the variable line impedance through the inverter and then connected to the test alternating current bus; the gas turbine is connected with variable line impedance through a rectifier and an inverter and then connected to a test alternating current bus; the diesel engine is connected with variable line impedance through a rectifier and an inverter and then connected to a test alternating current bus; the RTLAB semi-physical equipment is connected with variable line impedance through a rectifier and an inverter and then connected to a test alternating current bus; the load is connected with the test alternating current bus, and the middle of the test alternating current bus is disconnected by the breaker.
The experimental microgrid segment control structure comprises: the test alternating-current bus is divided into two sections, and a circuit breaker is arranged in the middle of the test alternating-current bus and used for separating the test alternating-current bus into two sections; the section of test alternating current bus is firstly connected with variable line impedance and then respectively connected with the super capacitor and the storage battery through the inverter; the section of test alternating current bus is also respectively connected with a gas turbine, a diesel engine and RTLAB semi-physical simulation equipment through variable line impedance, an inverter and a rectifier; the section of test alternating current bus is also connected with a simulation load and used for performing a fault simulation test;
the other section of test alternating current bus is connected with variable line impedance, the other end of the variable line impedance is connected with an inverter, and the other end of the inverter is connected with the photovoltaic; the breaking test alternating current bus is also connected with variable line impedance, the other end of the variable line impedance is connected with an inverter, the other end of the inverter is connected with a rectifier, and the other end of the rectifier is connected with a fan, so that not only is a simulation test performed, but also the breaking test alternating current bus can be connected to the previous bus to supply power to a load; when the load capacity is increased, the breaker is disconnected, and the bus connecting the photovoltaic and the fan is connected to the load end, so that the sectional control is realized.
The test alternating current bus and the power grid alternating current bus are both power grid 10kv alternating current buses.
The two connecting channels of the photovoltaic and the fan are that two output ports on the micro source are respectively connected with the inverter and then connected to the two test alternating current buses; most of the generated power is output to a first power grid alternating current bus through the inverter to supply power to regional loads, and the other small part of the generated power is output to another test alternating current bus through the inverter to perform a simulation test.
Further, when the load of the local area increases, the channel of the output simulation test is disconnected by a breaker, and all the power is supplied to the load.
The utility model has the following beneficial effects and advantages:
the utility model discloses test type microgrid's structure should be able to cover the structural style of present stage and following microgrid, according to the experimental scheme of difference, switches corresponding microgrid structure at will, including direct current microgrid, exchange microgrid, the mixed microgrid of alternating current-direct current, multipotency complementary microgrid. The experimental microgrid should have expansibility, and should include mainstream micro sources of the existing new energy microgrid and micro sources with development prospects in the future. According to different test microgrid structure requirements, the test type microgrid can be switched into different structure modes so as to meet corresponding structure detection conditions. The system is more reasonable in operation by using the power quality standard and the economic standard and adopting a two-stage operation optimization strategy.
The utility model discloses can simulate and verify various little electric wire netting structures. The utility model discloses an adopt double bus structure, sectional control to constitute experimental type microgrid to 10 kv's voltage circuit, changed traditional 10kv voltage circuit can only single bus structure's unicity. The structure of the experimental microgrid can be adjusted according to different demonstration engineering projects so as to carry out simulation verification. In which variable line impedances and analogue loads are added to replace the impedances and loads in the microgrid. And an optimal operation scheme is found by using a two-layer operation optimization method with an economic index as a bottom layer and an electric energy quality index as an upper layer, so that the test type microgrid always operates in an optimal working state.
The utility model discloses a can be used to test microgrid that microgrid structure and operation scheme verify and establish and control method, overcome in the past that 10kv generating line only has single bus structure, can only single operation, have the problem of limitation type. In order to simulate the microgrid tests in different scenes, a double-bus structure and a sectional control method are adopted. The simulation experiment can be carried out, and power can be supplied to regional loads. The photovoltaic and fan large-scale power generation equipment is provided with two connecting channels which are switched randomly. Due to different simulation scenes, a variable line impedance and an analog load are used instead. In a simulation test, two-stage optimization is carried out by utilizing two standards of electric energy quality and economy, and an optimal scheme is found out, so that the system is more reasonable to operate.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of a double-bus structure of an experimental microgrid according to the present invention;
fig. 2 is a schematic diagram of a test-type microgrid segment control structure of the present invention;
fig. 3 is a block diagram of the experimental microgrid floor optimization process of the present invention;
fig. 4 is the utility model discloses experimental type microgrid upper strata optimizes the operation index system block diagram.
In the figure:
the system comprises a photovoltaic 1, a fan 2, a super capacitor 3, a storage battery 4, a gas turbine 5, a diesel engine 6, RTLAB semi-physical equipment 7, a load 8, an inverter 9, a rectifier 10, a power grid alternating current bus 11, a test alternating current bus 12, a simulation load 13, variable line impedance 14 and a circuit breaker 15.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The technical solutions of some embodiments of the present invention are described below with reference to fig. 1 to 4.
Example 1
The utility model relates to a can be used to the experimental little electric wire netting of various little electric wire netting structure verification to establish, as shown in FIG. 1, FIG. 1 is the utility model discloses experimental type little electric wire netting double bus structure schematic diagram. The utility model discloses have double bus structure and segmentation control structure, both can the simulation experiment, can give the regional load power supply again.
The photovoltaic 1 is connected with a variable line impedance 14 through a DC/AC inverter 9, and is respectively connected to a power grid alternating current bus 11 and a test alternating current bus 12 through the other end of the variable line impedance 14.
The fan 2 is connected with a variable line impedance 14 through an AC/DC rectifier 10 and an inverter 9, and then is respectively connected to a power grid alternating current bus 11 and a test alternating current bus 12 through the other end of the variable line impedance 14.
The load 8 is connected to the grid ac bus 11. The super capacitor 3 is connected to a test alternating current bus 12 through an inverter 9 and a variable line impedance 14, the storage battery 4 is connected to the test alternating current bus 12 through the inverter 9 and the variable line impedance 14, the gas turbine 5 is connected to the test alternating current bus 12 through a rectifier 10 and the inverter 9 and the variable line impedance 14, the diesel engine 6 is connected to the test alternating current bus 12 through the rectifier 10 and the inverter 9 and the variable line impedance 14, the RTLAB semi-physical device 7 is connected to the test alternating current bus 12 through the rectifier 10 and the inverter 9 and the load 8 is connected to the test alternating current bus 12. The middle of the test AC bus 12 is opened by a breaker 15.
Wherein the load 8 is replaced by an analog load 13.
The test alternating current bus 12 is a test 10kv alternating current bus.
The power grid alternating current bus 11 is a power grid 10kv alternating current bus.
The double-bus structure refers to two buses in total, and a grid alternating current bus 11 is connected with a photovoltaic 1, a fan 2 and other large micro sources to directly supply power to a load 8 in a specified area. And the other test AC bus 12 is connected with simulation units such as a photovoltaic 1, a fan 2, a super capacitor 3, a storage battery 4, a gas turbine 5 and the like to perform simulation fault tests.
As shown in fig. 2, fig. 2 is a schematic diagram of the sectional control structure of the experimental microgrid of the present invention. The sectional control method is that the test alternating current bus 12 for the simulation experiment is divided into two sections in total, and the buses are separated by a breaker 15. One section of the system is connected with a super capacitor 3, a storage battery 4, a gas turbine 5, RTLAB semi-physical simulation equipment 7 and a simulation load 13 for fault simulation test. Wherein: the test alternating current bus 12 is firstly connected with a variable line impedance 14 and then connected with the super capacitor 3 through the inverter 9; the test AC bus 12 is also connected with another group of variable line impedances 14, and then is connected with the storage battery 4 through the inverter 9.
The section of test alternating current bus 12 is also sequentially connected with an inverter 9, a rectifier 10 and a gas turbine 5 through another group of variable line impedance 14; the section of test alternating current bus 12 is also connected with the inverter 9 and the rectifier 10 in sequence through another group of variable line impedance 14 to be connected with the diesel engine 6.
The section of test alternating current bus 12 is also sequentially connected with an inverter 9 and a rectifier 10 through another group of variable line impedance 14 to be connected with RTLAB semi-physical simulation equipment 7; the section of test alternating current bus 12 is also connected with a simulation load 13 and used for fault simulation test.
The other section of test alternating current bus 12 is connected with the photovoltaic 1 and the fan 2, so that a simulation test can be carried out, and the other section of test alternating current bus can be connected to the previous bus to supply power to the load 8. As the load 8 capacity increases. And the circuit breaker 15 is disconnected, and the buses of the photovoltaic 1 and the fan 2 are connected to the load 8 end, so that the sectional control is realized.
Wherein: the other section of the test alternating current bus 12 is connected with a variable line impedance 14, the other end of the variable line impedance 14 is connected with an inverter 9, and the other end of the inverter 9 is connected with the photovoltaic 1. The section of test alternating current bus 12 is also connected with another group of variable line impedances 14, the other ends of the variable line impedances 14 are connected with the inverter 9, the other end of the inverter 9 is connected with the rectifier 10, and the other end of the rectifier 10 is connected with the fan 2.
Two connection ways of photovoltaic 1 and fan 2 indicate that it connects on two experimental interchange buses to have two output ports to connect inverter 9 respectively on the little source. Wherein most of the generated power is output to a first grid AC bus 11 through an inverter 9 to supply power to a regional load, the other small part of the generated power is output to another test AC bus 12 through the inverter 9 to perform a simulation test, if the regional load is increased, a channel for outputting the simulation test is disconnected by a breaker 15, and all the generated power is supplied to a load 8.
The analog load 13 means that the analog load 13 can adjust the capacity or power demand characteristics according to the actual demand. In the process of constructing the experimental microgrid, the microgrid structure of each demonstration project is different, so that the regions are different. So that the required load capacities are different, the load simulation module of the test microgrid is replaced by the dummy load 13.
The variable line impedance 14 refers to adjusting the resistance value or the impedance characteristic according to actual requirements. Due to different demonstration projects, each micro source is connected to the output of the inverter 9 and is different from the distance of the test alternating current bus 12, and the line impedance of the line is replaced by the variable line impedance 14 in the process of carrying out simulation experiments. Therefore, the impedance value can be adjusted in real time according to the demonstration project, and time and cost are saved.
Example 2
When the concrete implementation, utilize a concrete operating procedure that can be used to the experimental little electric wire netting of various little electric wire netting structural verification to control divide into the two-stage optimization, the two-stage optimization indicate to utilize the economic nature index to optimize for the bottom index, electric energy quality optimizes for the upper index, makes the system operation reach the efficiency highest.
The bottom layer index is optimized, as shown in fig. 3, fig. 3 is the flow diagram of the bottom layer optimization of the experimental microgrid of the present invention. Taking photovoltaic and wind turbines as examples, photovoltaic power generation uses solar energy to convert into electric energy, so the photovoltaic power generation capability is changed due to the lapse of time. Dividing 24 hours a day into six time segments, one for every four hours, then optimizing every four times. The power emitted by the photovoltaic cell is assumed to be fixed within these four hours. The power distribution from the photovoltaic and wind turbines is random when the load capacity is fixed. In order to determine the optimal one, one hundred schemes are random, the power required to be sent by each of the photovoltaic and the fan is determined, the cost of the photovoltaic and the fan is calculated, and then comparison is made to exclude the 20 schemes with the highest cost. Then 20 schemes are selected to form a hundred, and 20 schemes with poor economical efficiency are eliminated. By analogy, 200 calculation comparisons are performed in total. The 10 sets of data with the best economy were selected. The ten sets of data are considered to be the most economical within the four hours. Then, the upper layer optimization is carried out, and the ten groups of data are respectively subjected to the calculation of the electric energy quality. And giving a weight to each power quality standard, multiplying the weight by the power quality standard, and adding to find a group of data with the best power quality. The set of data is then the optimal configuration for that time period.
Because the photovoltaic capacity is different every four hours, the optimization is performed every four hours. This ensures that the system is in an optimal operating state. The specific algorithm is as follows.
{PPV PWIND} 1.1
wherein, PPVFor photovoltaic output power, PWINDAnd outputting power for the fan.
the objective function of the economic optimization of the experimental microgrid system can be expressed as follows:
minZcost＝λ1A+λ2B+λ3C 1.2
in the formula, ZcostThe method is a test type micro-grid operation objective function, wherein A is system maintenance cost, B is system operation resource consumption cost, and C is system power generation profit. It can be known that the total system cost is equal to the maintenance cost and the resource cost minus the profit created; lambda [ alpha ]1For the system maintenance cost weight ratio, λ2For the system running cost weight ratio, λ3To create profit weight ratio for system power generation, and lambda1+λ2+λ3＝1。
the particle swarm algorithm is a random search algorithm based on a population, and comprises the following specific steps:
firstly, determining a feasible domain space, wherein in a D-dimensional feasible domain, the spatial positions of n random particles at time t are assumed as follows:
in the above formula:
representing the spatial position of each particle at time t.
The particle velocity was:
in the above formula:
representing the velocity of each particle at time t.
Meanwhile, assuming that each particle is a feasible solution of an equation to be solved, calculating a fitness function value of the particle, and longitudinally comparing the sizes of historical fitness values of the particles before t moment to obtain an individual historical optimal position:
in the above formula:
a historical optimum value representing the current position of each particle.
And then, when the time t is transversely aligned, the size of the fitness value obtains the global optimal position in the current iteration:
in the above formula:
representing the global optimum of each particle.
Iterative optimization is carried out on the particles, and at the moment of t +1, the space position coordinate xi(t) and velocity vi(t), the formula is as follows:
vi(t+1)＝vi(t)+c1·r1(pi(t)-xi(t))+c2·r2(pg(t)-xi(t)) 3.5
in the formula, c1And c2Respectively represent the learning constants of the particles; r is1And r2In [0,1 ]]Uniformly taking values; p is a radical ofiIs an individual extremum; p is a radical ofgIs a global extremum.
According to the formula, the speed updating formula consists of three parts, wherein the first part enables the algorithm to carry out global search and balances global and local search capabilities; the second part enables the particles to perform a stronger local search; the third part considers the ability of the particles to learn from the particles in the whole population, and embodies the information sharing among different particles.
The position of the particle is updated by updating the corresponding speed, and the position formula is shown as the following formula:
xi(t+1)＝xi(t)+vi(t+1) 3.6
by limiting the amplitude of the speed variation, let vmin＜vi(t)＜vmaxAnd limiting the size of the position change of the particles. In multiple iterations, each particle in the population is updated cyclically, so that the whole population gradually approaches the global optimal solution.
as shown in fig. 4, fig. 4 is a block diagram of the experimental microgrid upper layer optimized operation index system of the present invention.
The method aims to research the relation between distributed power sources and loads of the micro-grid system and the quality of various electric energy qualities according to the requirements of the power grid and the requirements of related technologies, and mainly evaluates the micro-grid from two aspects of reliability and goodness.
Experimental type microgrid upper strata index is optimized, include:
step 41: establishing reliability and goodness as first-level indexes, and establishing satisfaction rate, insufficient power, system capacity utilization rate, voltage deviation, harmonic waves, three-phase unbalance and frequency deviation as second-level indexes.
Step 42: and carrying out weight distribution on the reliability and the goodness of the first-level indexes. The reliability ratio is 0.3, and the goodness ratio is 0.7.
Step 43: performing weight distribution on the second-level index of reliability, wherein the load satisfaction rate is 0.4, the power shortage rate is 0.2, and the system capacity standby rate is 0.4; and (3) carrying out weight distribution on the secondary indexes of goodness, wherein the evaluation rate deviation ratio is 0.27, the voltage deviation ratio is 0.34, the three-phase unbalance ratio is 0.22, and the harmonic ratio is 0.17.
And 5, determining a membership function:
the membership function is a relationship between the last score and the evaluation index, and is a criterion for obtaining the score of each index. The utility model discloses a membership function of each index is established to the Cauchy distribution, and the Cauchy distribution is as shown.
Absolute value of deviation of the index from the optimal index; alpha is alphaiAnd betaiCoefficient of Cauchi distribution corresponding to the ith index, beta in the utility modeliThe value is 1.45.
The algorithm for the optimal membership is as follows:
firstly, selecting a range, then taking a number from the selected range, and calling it as optimum standard value, then its correspondent optimum membership degree is 1, thenAnd selecting a corresponding reference value according to the known condition range, and specifying the corresponding optimal membership degree of 0.5, so that the numerical value of the unknown parameter can be calculated, and other optimal membership degrees can be known. Taking the frequency deviation in the primary index goodness of the experimental microgrid as an example, assuming that the limit value of the selected frequency deviation is plus or minus 0.5Hz, calculating by using an absolute value, and when the specified edge value, namely the frequency deviation is 1%, the optimal membership degree of 0.5 is evaluated to be 0.5; the frequency deviation is 0, which is the best index value, and the evaluation score is 1 corresponding to the membership degree of 1. According to xiWhen 1, λi0.5, push-out αiThe membership function for the frequency deviation is calculated as 1:
in the above formula: x is the number ofiRepresenting a frequency deviation, λiRepresenting the optimal degree of membership.
Ten economic optimal solutions are taken, and ten groups of data are respectively put into a simulation program to run. And then, calculating the power quality indexes of all groups according to power quality weight distribution, and selecting an optimal group which is a group of data optimal in the time period.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents of the embodiments of the invention may be made without departing from the spirit and scope of the invention, which should be construed as falling within the scope of the claims of the invention.
Claims (5)
1. The test microgrid construction method can be used for verifying various microgrid structures, and is characterized in that:
the test type microgrid comprises a double-bus structure and a segmented control structure;
the experimental microgrid double-bus structure comprises two buses, wherein one power grid alternating current bus is connected with a photovoltaic (1), a fan (2) and a load (8); the other test alternating current bus is connected with a photovoltaic (1), a fan (2), a super capacitor (3), a storage battery (4), a gas turbine (5), a diesel engine (6), RTLAB semi-physical equipment (7) and a load (8);
the test type microgrid subsection control structure comprises a power grid alternating current bus, the power grid alternating current bus is divided into two sections in total, and a circuit breaker (15) is arranged in the middle of the power grid alternating current bus; one section of power grid alternating current bus is connected with a super capacitor (3), a storage battery (4), a gas turbine (5), a diesel engine (6), RTLAB semi-physical equipment (7) and a simulation load (13); and the other section of power grid alternating current bus is connected with a photovoltaic (1) and a fan (2).
2. A test microgrid construction usable for various microgrid structural verifications as claimed in claim 1, characterized in that: the test type microgrid double-bus structure comprises: the photovoltaic (1) is sequentially connected with a variable line impedance (14) through a DC/AC inverter (9) and is respectively connected to a power grid alternating current bus (11) and a test alternating current bus (12) through the variable line impedance (14); the fan (2) is connected with a variable line impedance (14) through an AC/DC rectifier (10) and an inverter (9), and then is respectively connected to a power grid alternating current bus (11) and a test alternating current bus (12) through the variable line impedance (14); the load (8) is connected to a power grid alternating current bus (11); the super capacitor (3) is connected with a variable line impedance (14) through an inverter (9) and then is connected to a test alternating current bus (12); the storage battery (4) is connected with a variable line impedance (14) through an inverter (9) and then is connected to a test alternating current bus (12); the gas turbine (5) is connected with a variable line impedance (14) through a rectifier (10) and an inverter (9) and then is connected to a test alternating current bus (12); the diesel engine (6) is connected with a variable line impedance (14) through a rectifier (10) and an inverter (9) and then is connected to a test alternating current bus (12); the RTLAB semi-physical equipment (7) is connected with a variable line impedance (14) through a rectifier (10) and an inverter (9) and then is connected to a test alternating current bus (12); the load (8) is connected with the test alternating current bus (12), and the middle of the test alternating current bus (12) is disconnected by the breaker (15).
3. A test microgrid construction usable for various microgrid structural verifications as claimed in claim 1, characterized in that: the experimental microgrid segment control structure comprises: the test alternating-current bus (12) is divided into two sections, a circuit breaker (15) is arranged in the middle of the test alternating-current bus (12), and the test alternating-current bus (12) is divided into two sections; the section of test alternating current bus (12) is firstly connected with a variable line impedance (14) and then respectively connected with the super capacitor (3) and the storage battery (4) through the inverter (9); the section of test alternating current bus (12) is also respectively connected with a gas turbine (5), a diesel engine (6) and RTLAB semi-physical equipment (7) through variable line impedance (14), an inverter (9) and a rectifier (10); the section of test alternating current bus (12) is also connected with a simulation load (13) and used for fault simulation test;
the other section of test alternating current bus (12) is connected with a variable line impedance (14), the other end of the variable line impedance (14) is connected with an inverter (9), and the other end of the inverter (9) is connected with the photovoltaic (1); the breaking test alternating current bus (12) is also connected with a variable line impedance (14), the other end of the variable line impedance (14) is connected with an inverter (9), the other end of the inverter (9) is connected with a rectifier (10), the other end of the rectifier (10) is connected with a fan (2), and the breaking test alternating current bus not only can be used for a simulation test, but also can be connected to the previous bus to supply power to a load (8); when the capacity of the load (8) is increased, the breaker (15) is disconnected, and the buses connecting the photovoltaic (1) and the fan (2) are connected to the load (8) end, so that segmented control is realized.
4. A test microgrid construction usable for various microgrid structural verifications as claimed in claim 1, characterized in that: the test alternating current bus (12) and the power grid alternating current bus (11) are both power grid 10kv alternating current buses.
5. A test microgrid construction usable for various microgrid structural verifications as claimed in claim 1, characterized in that: the two connecting channels of the photovoltaic (1) and the fan (2) are that two output ports on a micro source are respectively connected with an inverter (9) and then connected to two test alternating current buses; the power generation part is output to a first power grid alternating current bus (11) through an inverter (9) to supply power to regional loads, and the other part is output to another test alternating current bus (12) through the inverter (9) to perform a simulation test.
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