CN111896887B - Distribution network real-environment test platform connected with distributed power supply and test method thereof - Google Patents
Distribution network real-environment test platform connected with distributed power supply and test method thereof Download PDFInfo
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Abstract
The invention discloses a distribution network real-environment test platform accessed to a distributed power supply and a test method thereof, wherein the test platform comprises a main power supply, a bus, a branch line, a neutral point grounding complete set device and a distributed power supply simulation device; the main power supply is connected with the branch line through a bus; the bus is provided with a reserved interface, an electric energy quality testing interface and an indoor dry-type transformer; a reserved tested equipment interface is arranged on the branch line; the neutral point grounding complete set device is connected with the bus through a grounding transformer; the distributed power supply simulation device is connected with the bus through a reserved interface, an electric energy quality testing interface or an indoor dry-type transformer; or the distributed power supply simulation device is connected with the tested equipment interface through the distribution transformer; or the distributed power supply simulation device is connected with the tested equipment interface through the distribution transformer and is connected with at least one user charge in parallel. The invention can realize the access of the distributed power supply under different permeabilities, provides the field environment which is closest to the real distribution network, and obtains an accurate detection result.
Description
Technical Field
The invention relates to the technical field of power equipment detection, in particular to a distribution network real-time test platform accessed to a distributed power supply and a test method thereof.
Background
Feeder automation is the use of automation devices or systems to monitor the operating conditions of a distribution network, discover distribution network faults in time, locate and isolate faults, and restore power to non-faulty areas. With the continuous improvement of the permeability of the distributed power supply in the power distribution network system, when the system fails, the short-circuit current provided by the distributed power supply is also continuously increased, which inevitably affects the reliability and sensitivity of the original protection. However, the current research on the transient influence of the distributed power supply is mainly based on simulation results or laboratory environment research, and inevitably different from the actual fault characteristics, so that the fixed value setting of protection and the effectiveness of a scheme are influenced, and the abnormality or the failure of the scheme or the device is possibly caused.
Disclosure of Invention
The invention aims to provide a distribution network real-environment test platform with distributed power supply access and a test method thereof, and provides the distribution network real-environment test platform with real net racks, lines, multiple neutral point grounding modes, various types of grounding faults and short-circuit faults.
In order to achieve the above object, an embodiment of the present invention provides a distribution network real-world test platform connected to a distributed power supply, including a main power supply, a bus, a branch line, a neutral point grounding complete set of devices, and a distributed power supply simulation device; wherein the main power supply is connected with the branch line through the bus bar; the bus is provided with a reserved interface, an electric energy quality testing interface and an indoor dry-type transformer; a reserved tested equipment interface is arranged on the branch line; the neutral point grounding complete set device is connected with the bus through a grounding transformer; the distributed power supply simulation device is connected with the bus through the reserved interface, the electric energy quality testing interface or the indoor dry-type transformer; or the distributed power supply simulation device is connected with the tested device interface through a distribution transformer; or the distributed power supply simulation device is connected with the tested equipment interface through a distribution transformer and is connected with at least one user charge in parallel.
Another embodiment of the present invention provides a method for testing a distribution network real-world test platform based on the above-mentioned access distributed power supply, including the following steps:
determining the permeability of a distribution network real-environment test platform according to the permeability of the distributed power supply on the actual engineering site;
acquiring the rated capacity of a main transformer of the distribution network real-world test platform, and determining the sum of the capacities of all distributed power supply simulation devices of the distribution network real-world test platform according to the permeability of the distribution network real-world test platform and the rated capacity;
determining installed capacity and types of the accessed distributed power supply simulation devices according to the operation constraint conditions and the sum of the capacities of all the distributed power supply simulation devices;
selecting an access position of the distributed power supply simulation device according to test requirements;
and simulating the faults at different positions of the distribution network real-world test platform according to test requirements so as to perform fault simulation tests.
Preferably, the operational constraints include line transfer capacity constraints, main transformer rated capacity constraints, node voltage constraints and bus short circuit current constraints.
Preferably, the access position of the distributed power source simulation apparatus includes:
the distributed power supply simulation device is connected with a bus on the distribution network real-time test platform through the reserved interface, the electric energy quality test interface or the indoor dry-type transformer;
the distributed power supply simulation device is connected with a tested device interface of a branch line on the distribution network real-time test platform through a distribution transformer; and the number of the first and second groups,
the distributed power supply simulation device is connected with tested equipment interfaces of branch lines on the distribution network real-time test platform through a distribution transformer and is connected with at least one user charge in parallel.
Preferably, the fault simulation test comprises a short circuit fault simulation test and a ground fault simulation test; the short-circuit fault of the short-circuit fault simulation test is generated by a short-circuit fault simulation unit, and the ground fault of the ground fault simulation test is generated by a ground fault simulation unit.
Preferably, the fault occurrence positions of the fault simulation test are divided into three categories, namely that the fault point is located at the upstream of the distributed power supply access point, the fault point is located at the downstream of the distributed power supply access point, and the fault point is located on the adjacent line of the distributed power supply access point.
Compared with the prior art, the distribution network real-environment test platform accessed with the distributed power supply and the test method thereof provided by the embodiment of the invention have the advantages that the real-environment test platform comprises real and simulated overhead lines and cable lines, various grid structure types can be flexibly constructed, the distributed power supply access under different permeability conditions can be realized, and the real-environment reproduction of different types and different access positions of the distributed power supply can be realized.
Drawings
Fig. 1 is a schematic diagram of an overall design framework of a distribution network real-world test platform accessing a distributed power supply according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a testing method of a distribution network real-world testing platform based on access to a distributed power supply according to an embodiment of the present invention;
FIG. 3 is an equivalent circuit diagram with a fault point upstream of a distributed power access point according to one embodiment of the present invention;
FIG. 4 is an equivalent circuit diagram with a fault point downstream of a distributed power access point according to an embodiment of the present invention;
fig. 5 is an equivalent circuit diagram of a neighboring line with a fault point located at a distributed power access point according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the schematic diagram of a general design framework of a distribution network real-world test platform accessed to a distributed power supply according to an embodiment of the present invention is provided, where the distribution network real-world test platform includes a main power supply, a bus, a branch line, a neutral point grounding complete set of devices, and a distributed power supply simulation device; wherein the main power supply is connected with the branch line through the bus bar; the bus is provided with a reserved interface, an electric energy quality testing interface and an indoor dry-type transformer; a reserved tested equipment interface is arranged on the branch line; the neutral point grounding complete set device is connected with the bus through a grounding transformer; the distributed power supply simulation device is connected with the bus through the reserved interface, the electric energy quality testing interface or the indoor dry-type transformer; or the distributed power supply simulation device is connected with the tested device interface through a distribution transformer; or the distributed power supply simulation device is connected with the tested equipment interface through a distribution transformer and is connected with at least one user charge in parallel.
Specifically, the distribution network real-environment test platform comprises a main power supply, a bus, a branch line, a neutral point grounding complete set device and a distributed power supply simulation device; the main power supply is a 1-turn 10kV special line, and is set to be in a single bus section mode after passing through 1 2000kVA 10kV isolation transformer. The bus is divided into two sections, including I section bus and II section bus. The main power supply is connected with the branch line through a bus. 8 switch cabinets are arranged on the first section of bus, namely 1 incoming line cabinet (G01 in fig. 1), 1 voltage transformer cabinet (also called PT cabinet) and 6 outgoing line cabinets (G02-G07 in fig. 1); 7 switch cabinets and 1 reservation cabinet are arranged on the second section of bus, and the 7 switch cabinets are respectively 1 incoming line cabinet (G08 in fig. 1), 1 voltage transformer cabinet and 5 outgoing line cabinets (G09-G013 in fig. 1). The switch cabinets are all provided with protection measurement and control devices and have protection functions of quick disconnection, overcurrent and the like. Six branch lines are arranged, namely F1-F6, which correspond to G02, G03, G04, G09, G10 and G11 in the figure 1, namely three branch lines are arranged on one section of the bus. The bus is provided with a reserved interface, an electric energy quality testing interface and an indoor dry-type transformer which are respectively corresponding to G12, G13 and G05. And a reserved tested equipment interface is arranged on the branch line and is used for accessing the tested equipment. An outdoor switch box is also arranged on the branch line. The neutral grounding complete set device is connected with the bus through a grounding transformer. The neutral point grounding mode of the neutral point grounding complete set of device comprises grounding through the arc suppression coil, grounding through the small resistor, grounding through the arc suppression coil and the small resistor, and non-grounding of the neutral point. The neutral point grounding complete device is used for leading out a system neutral point and grounding.
The outgoing line voltage of the analog distributed power supply is generally 380V, and the analog distributed power supply can be directly connected to a low-voltage side and can also output 10kV voltage through a step-up transformer. The accessed analog distributed power supply should meet the specified grid connection requirement. The distributed power supply simulation device has three access modes when being accessed to a real environment test platform:
(1) special line access bus
The distributed power supply simulation device is connected to the reserved interface of G12 or the power quality test access end of G13 through the step-up transformer, and simulation of the condition that a special line is connected to a bus can be achieved.
G05 is connected with an indoor dry type transformer, can be used as a step-up transformer temporarily if necessary, and the distributed power supply simulation device is connected to the dry type low voltage side, which is equivalent to being connected to a bus through a private line.
The access positions are G12, G13 and G05, namely, the distributed power supply simulation device is connected with the bus through a reserved interface, a power quality testing interface or an indoor dry-type transformer.
(2) T-type access main feeder
The distributed power supply simulation device can be further increased to 10kV through a step-up transformer, and connected to a reserved tested device interface on a line from F1 to F6, so that the condition that a T-shaped power supply is connected to a main feeder line can be simulated.
The distributed power supply simulation device is connected to the low-voltage side of each distribution transformer through 380V, the distribution transformers can be used as a boosting transformer temporarily, the boosting voltage is increased to 10kV, the condition that a T-shaped access main feeder is simulated, and more access nodes are obtained.
The access positions are positions of each tested equipment interface and each distribution transformer, namely, the distributed power supply simulation device is connected with the tested equipment interface through the distribution transformer and is accessed into the test platform from the branch line.
(3) Low voltage side access
The low-voltage side access is similar to the T-type access main feeder, and the difference between the low-voltage side access and the T-type access main feeder is that when the low-voltage side access is carried out, the low-voltage side has other loads, and the electric energy transmitted by the distributed power supply can be consumed.
Therefore, the distributed power supply simulation device is connected to the low-voltage side of the distribution transformers from F1 to F6 through 380V and is connected with the user load in parallel, and the connection mode can simulate the mode of low-voltage side connection. The load comprises a resistive power frequency load, an inductive power frequency load, a capacitive power frequency load and a nonlinear load which can generate harmonic waves, the load capacity is adjustable, the requirement that the whole line load current of a single 10kV line can reach 10A or more is met, and the load capacity is 173kW or more.
The access positions are the positions of the interfaces of the tested equipment and the distribution transformers. That is, the distributed power source simulation apparatus is interfaced with the device under test through a distribution transformer and connected in parallel with at least one user charge.
It should be noted that the distribution network real-world test platform covers main 10kV distribution network elements such as 10kV overhead lines, cable lines, column switches, switch cabinets, and the like. The branch line of the first section of the bus is a cable line, and can construct a single-radiation structure, a single-ring network structure, a 2-1 single-ring network structure, a 3-1 single-ring network structure, a 2-supply 1 backup structure and a double-ring network structure. The 3-1 single-ring network structure refers to 3 loops 1. The branch line of the first section of the bus is an overhead line, and a single radiation structure, a tail end connection structure, a multi-section moderate connection structure, a two-supply one-standby structure and a three-supply one-standby structure can be constructed. Therefore, the line network frame of the distribution network real-environment test platform can construct various circuit structures required by power test, and the applicability is strong.
The distribution network real-environment test platform connected with the distributed power supply comprises real and simulated overhead lines and cable lines, can flexibly construct various grid structure types, can realize distributed power supply connection under different permeability conditions, and can realize real-environment reproduction of different types and different connection positions of the distributed power supply.
Referring to fig. 2, it is a schematic flow chart of a testing method of the distribution network real-world testing platform based on the above-mentioned access distributed power source according to another embodiment of the present invention, where the method includes steps S1 to S5:
s1, determining the permeability of the distribution network real-environment test platform according to the permeability of the distributed power supply of the actual engineering site;
s2, obtaining the rated capacity of a main transformer of the distribution network real-world test platform, and determining the sum of the capacities of all distributed power supply simulation devices of the distribution network real-world test platform according to the permeability of the distribution network real-world test platform and the rated capacity;
s3, determining installed capacity and type of the accessed distributed power supply simulation device according to the operation constraint condition and the sum of the capacities of all the distributed power supply simulation devices;
s4, selecting the access positions of the distributed power supply simulation devices according to test requirements;
and S5, simulating the faults at different positions of the distribution network real-environment test platform according to test requirements so as to perform fault simulation tests.
Specifically, because the system capacity of the real-world test platform is relatively limited, the power capacity access of a real actual field cannot be met in the condition setting of the distributed power supply, and therefore the equivalent test method is provided by the scheme of the invention. And determining the permeability of the distribution network real-world test platform according to the permeability of the distributed power supply of the actual engineering site, namely determining that the permeability of the distribution network real-world test platform is equal to the permeability of the distributed power supply of the actual engineering site.
The permeability of the distributed power supply is divided into power permeability and energy permeability, wherein the permeability refers to the power permeability and is a ratio of the total installed capacity of the distributed power supply to the total capacity of equipment, and the calculation formula is
In the above formula, P rt As permeability, S Gsum Is the sum of installed capacities, S, of all distributed power supplies T The rated capacity of the main transformer is obtained.
Because the influence of the distributed power supply on the steady state and the transient state of the system is related to the permeability, the situation of a field can be equivalently simulated in the same way of the permeability.
And acquiring the rated capacity of a main transformer of the distribution network real-environment test platform, namely acquiring an isolation transformer of a main power outlet of the test platform, wherein the rated capacity of the main transformer is 2000kVA, namely 2 MVA. And determining the sum of the capacities of all the distributed power supplies of the distribution network real-world test platform according to the permeability and the rated capacity of the distribution network real-world test platform, namely determining the sum of the capacities of all the distributed power supplies as the product of the permeability and the rated capacity of the main transformer. That is to say, the capacity of the main transformer of the real-world test platform is 2MVA, and the access capacity of the distributed power supply is 2P rt (MVA)。
When the specific accessed distributed energy type and capacity are selected, the control of the grid-connected condition of the distributed power supply needs to be considered in the actual situation, and a series of constraint conditions can be obtained. Therefore, the installed capacity and the type of the accessed distributed power supply simulation device are determined according to the operation constraint condition and the sum of the capacities of all the distributed power supply simulation devices. The distributed power supply simulation device is of a hydroelectric simulation device, a wind power simulation device, a photovoltaic power generation simulation device and the like.
And selecting the access position of the distributed power supply simulation device according to the test requirement. When the condition that a special line is required to be simulated to be connected with the bus is required, the connection positions of the distributed power supply simulation device are G12, G13 and G05. When the condition of T-shaped access main feeder is required to be simulated, the access positions of the distributed power supply simulation device are the positions of each tested device interface and each distribution transformer. When the condition of low-voltage side access needs to be simulated, the access positions of the distributed power supply simulation device are the positions of each tested device interface and each distribution transformer, and at least one user load is connected in parallel.
And simulating the distribution network real-environment test platform to generate faults at different positions according to test requirements so as to perform fault simulation tests. The general procedure for the test was: the distributed power supply simulation device is connected into a distribution network real-environment test platform, a net rack form is selected according to test requirements, a neutral point grounding mode is selected through a neutral point grounding complete device, the occurrence of faults is simulated, the output condition and state change or action of the distributed power supply simulation device are observed, and the recurrence of the field fault condition is achieved.
As an improvement of the scheme, the constraint conditions of the operation comprise a line transmission capacity constraint, a rated capacity constraint of a main transformer, a node voltage constraint and a bus short-circuit current constraint.
Specifically, the constraints of operation include line transfer capacity constraints, main transformer rated capacity constraints, node voltage constraints, and bus short circuit current constraints. Wherein,
1) line transport capacity constraints
Considering that all the output of the distributed power supply is sent upwards, in order to ensure that the current-carrying capacity of the distribution line is not out of limit, the maximum installed capacity of the distributed power supply simulation device connected to each branch line loop should be the rated transmission capacity of the line, namely the installed capacity of the distributed power supply simulation device connected to each branch line loop should be smaller than or equal to the rated transmission capacity of the line.
2) Rated capacity constraint of main transformer
The maximum installed capacity of the distributed power supply simulation device accessible to the main transformer power supply area is the rated capacity value of the main transformer, namely the installed capacity of the distributed power supply simulation device accessible to the main transformer power supply area is smaller than or equal to the rated capacity of the main transformer.
3) Node voltage constraint
In general, the effect of a single-circuit line-connected distributed power supply on the bus voltage can be expressed as
Where Δ U is the voltage deviation, Δ Q is the injected reactive delta, S C The short-circuit capacity of the grid-connected point C of the distributed power supply.
4) Bus short circuit current constraint
According to the regulation in GB/T12325-2008 power quality supply voltage deviation, the three-phase supply voltage deviation of 20kV and below is +/-7% of the nominal voltage; and setting the short-circuit current of the 10kV bus not to exceed 20kA according to the relevant requirements of the national power grid and the southern power grid in the technical guidance principle of the planning of the medium-voltage distribution network.
As an improvement of the above solution, the access position of the distributed power source simulation apparatus includes:
the distributed power supply simulation device is connected with a bus on the distribution network real-time test platform through the reserved interface, the electric energy quality test interface or the indoor dry-type transformer;
the distributed power supply simulation device is connected with a tested device interface of a branch line on the distribution network real-time test platform through a distribution transformer; and the number of the first and second groups,
the distributed power supply simulation device is connected with tested equipment interfaces of branch lines on the distribution network real-time test platform through a distribution transformer and is connected with at least one user charge in parallel.
Specifically, the access positions of the distributed power sources include the following three cases:
1) when the condition that a special line is required to be simulated to access the bus, the access positions of the distributed power supply are G12, G13 and G05.
The distributed power supply simulation device is connected with a bus on the distribution network real-time test platform through a reserved interface, an electric energy quality test interface or an indoor dry-type transformer;
2) when the condition of T-shaped access to the main feeder needs to be simulated, the access positions of the distributed power supply are the positions of each tested device interface and each distribution transformer.
Namely, the distributed power supply simulation device is connected with a tested equipment interface of a branch line on the distribution network real-world test platform through a distribution transformer; and the number of the first and second groups,
3) when the condition of low-voltage side access needs to be simulated, the access positions of the distributed power supply are the positions of each tested equipment interface and each distribution transformer, and at least one user load is connected in parallel.
Namely, the distributed power supply simulation device is connected with the tested equipment interface of the branch line on the distribution network real-time test platform through the distribution transformer and is connected with at least one user charge in parallel.
As an improvement of the above scheme, the fault simulation test comprises a short-circuit fault simulation test and a ground fault simulation test; the short-circuit fault of the short-circuit fault simulation test is generated by a short-circuit fault simulation unit, and the ground fault of the ground fault simulation test is generated by a ground fault simulation unit.
Specifically, the fault simulation test has two types, including a short-circuit fault simulation test and a ground fault simulation test; the short-circuit fault of the short-circuit fault simulation test is generated by the short-circuit fault simulation unit, and the ground fault of the ground fault simulation test is generated by the ground fault simulation unit. Two types of failures are described in detail below:
A. short circuit fault
The short-circuit fault simulation unit can generate an interphase two-phase short-circuit fault and a three-phase short-circuit fault, the current of the interphase short-circuit fault can reach 1500A at most, and the longest duration time is 200 ms. The fault current can be adjusted by forming phase-to-phase faults through different resistors and is realized through 35kV isolation disconnecting switches (selecting different resistors).
B. Ground fault
The ground fault simulation unit can perform single-phase ground fault simulation of various types and different parameters, including metallic ground fault, grounding via a fixed resistor (50-2000 omega), arc grounding and the like.
Different types of faults are simulated through switching. Single-phase ground faults that can be simulated include: metallic grounding faults (switching 12kV vacuum contactors), arc grounding faults (switching arc grounding simulation devices), grounding faults with different resistance values (50-2000 omega, grouping switching), and arc grounding faults through transition resistors. Meanwhile, the grounding conditions of different media, such as grounding through a pond, grounding through grasslands, grounding on the surface of soil and the like, can be simulated.
As an improvement of the above scheme, the fault occurrence positions of the fault simulation test are divided into three categories, namely that the fault point is located at the upstream of the distributed power supply access point, the fault point is located at the downstream of the distributed power supply access point, and the fault point is located at the adjacent line of the distributed power supply access point.
Specifically, because the main test object of the invention is a distributed power supply, the fault occurrence positions of the fault simulation test can be divided into three categories, namely, the fault point is located at the upstream of the distributed power supply access point, the fault point is located at the downstream of the distributed power supply access point, and the fault point is located at the adjacent line of the distributed power supply access point, according to the position relationship between the fault occurrence position and the distributed power supply access point. When faults occur at different positions, the influences of distributed energy access on a feeder automation scheme are different, but the distributed energy access method can be used for simulating so as to better understand the operation condition of an actual engineering field. Referring to fig. 3, an equivalent circuit diagram of a fault point located upstream of a distributed power access point according to the embodiment of the present invention is provided, referring to fig. 4, an equivalent circuit diagram of a fault point located downstream of a distributed power access point according to the embodiment of the present invention is provided, referring to fig. 5, an equivalent circuit diagram of a neighboring line of a fault point located at a distributed power access point according to the embodiment of the present invention is provided.
The distribution network real-environment test platform accessed to the distributed power supply also meets the following requirements:
(1) for simulating photovoltaic power generation
The photovoltaic power generation simulation device of the real environment test platform has the following functions:
a. the power generation condition of the photovoltaic module can be simulated by setting different illumination intensities and different module temperatures;
b. the photovoltaic module power generation conditions in different seasons and different weather conditions are simulated; simulating the photovoltaic power generation process of one day under different weather conditions;
c. the photovoltaic power generation simulation system simulates the processes of starting, stopping, running, grid connection and island of the photovoltaic power generation system; simulating the interactive operation of the photovoltaic power generation system, a power grid and a distributed power supply; the low voltage ride through capability is achieved;
d. the photovoltaic simulation system has the function of real Maximum Power Point Tracking (MPPT) of the photovoltaic power generation system;
e. the photovoltaic simulation system can self-define the parameter function, and simulate different photovoltaic power generation conditions by setting different parameters such as open-circuit voltage, short-circuit current, maximum power point voltage and current. And an external photovoltaic curve importing function is supported, and photovoltaic output characteristics under different working conditions are simulated according to imported photovoltaic curve data.
That is to say, the photovoltaic power generation simulation system can simulate the power generation process of a real photovoltaic power generation system, simulate the automatic starting, running, grid connection and island process of a photovoltaic power station, simulate the power generation conditions of photovoltaic arrays under different material typical photovoltaic components (monocrystalline silicon, polycrystalline silicon and copper indium gallium selenide thin-film batteries), different illumination intensities and different component temperatures, and can simulate the power generation conditions of the photovoltaic arrays under different seasons and different weather conditions; simulating the photovoltaic power generation process of one day under different weather conditions; simulating a photovoltaic power generation process under shadow shielding; the touch screen is provided, so that local operation can be facilitated; the device is provided with a remote control interface and can be connected with a background; the photovoltaic power generation system is provided with simulation software, and operation of the photovoltaic power generation system is convenient to carry out.
(2) For simulating wind power generation
The wind power generation simulation device of the real environment test platform has the following functions:
a. simulating the starting, stopping, running and grid-connected processes of a real wind driven generator;
b. simulating the power generation state and the running state of a real wind driven generator at different wind speeds; the low voltage ride through capability is achieved;
c. simulating the interactive operation of a real wind driven generator, a power grid and a distributed power supply;
d. a control system of a real wind driven generator is simulated, and remote/local setting of fixed values, parameters and other operations are supported;
e. the wind speed under external working conditions and the importing and inquiring of a custom wind speed curve are supported;
f. and continuously controlling the motor according to a preset wind speed curve.
The wind power generation simulation device consists of a double-fed generator and a control system. The double-fed wind driven generator control system is suitable for analog control of a test platform of a small-sized 5-30 kW wind driven generator, and the platform can provide exciting current for the double-fed generator to realize the functions of variable-speed constant-frequency output, no-load grid connection, active power decoupling control and reactive power decoupling control; the motor can be driven, various periodic and variable wind speed curves can be set, and the motor driving capability of torque and rotating speed is supported; various rotating speed (torque) -time curves can be flexibly set, the rotating speed (torque) of the motor can be continuously adjusted, meanwhile, the given value of the output power of the converter is calculated according to the rotating speed-power curves, and the given value is communicated with the converter in real time to simulate the maximum wind energy tracking function.
(3) For simulating small hydropower stations
The small hydropower simulation device of the real environment test platform has the following functions:
a. simulating the starting, stopping and running processes of the small hydroelectric generator; start-stop time: a minimum of 10 s;
b. the small hydropower generator simulator platform has two working modes of hot standby and cold standby, namely two running modes of grid connection and island, and can realize automatic switching between grid connection and grid disconnection;
c. the small hydroelectric generator simulator platform can be operated with commercial power and a distributed power supply in an interactive manner and can be automatically started/stopped;
d. the system supports external real-time power curve import and query, and historical data import and query of an upper computer;
e. and supporting the operation in a preset curve mode and outputting according to a user-defined power curve.
That is to say, the real-environment test platform of the invention can simulate the start-stop control of a real small hydroelectric generator, simulate various running states of the real small hydroelectric generator, simulate the interactive running of the real small hydroelectric generator and a large power grid or a distributed power supply, measure various electrical parameters of a system, record various electrical parameters in real time, have perfect protection function and the like.
In summary, the distribution network real-world test platform and the test method thereof provided by the embodiments of the present invention provide a distribution network real-world test platform with real grid frames, lines, multiple neutral point grounding modes, and various types of ground faults and short-circuit faults. The distributed power supply simulation device provided by the invention adopts the programmable power supply, simulates and outputs the output condition of the typical distributed power supply, can superpose the real influence of the distributed power supply in the actual operation environment, and provides the configuration method of the distributed power supply under different conditions. Compared with the simulation result, the influence is closer to the real operating environment, and the complex electromagnetic action in the actual device can be partially reproduced. The invention also provides the characteristic requirements of the distributed power supply, can realize the grid structure with different permeability, and is consistent with the field operation condition. By the detection method based on the platform, the on-site environment and the fault current which are closest to the real distribution network can be provided for the feeder line automatic protection scheme, and an accurate detection result is obtained.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (5)
1. A test method of a distribution network real-world test platform accessed with a distributed power supply is characterized in that the distribution network real-world test platform accessed with the distributed power supply comprises a main power supply, a bus, a branch line, a neutral point grounding integrated device and a distributed power supply simulation device; wherein the main power supply is connected with the branch line through the bus bar; the bus is provided with a reserved interface, an electric energy quality testing interface and an indoor dry-type transformer; a reserved tested equipment interface is arranged on the branch line; the neutral point grounding complete set device is connected with the bus through a grounding transformer; the distributed power supply simulation device is connected with the bus through the reserved interface, the electric energy quality testing interface or the indoor dry-type transformer; or the distributed power supply simulation device is connected with the tested device interface through a distribution transformer; or the distributed power supply simulation device is connected with the tested equipment interface through a distribution transformer and is connected with at least one user charge in parallel;
the test method comprises the following steps:
determining the permeability of a distribution network real-environment test platform according to the permeability of the distributed power supply on the actual engineering site;
acquiring the rated capacity of a main transformer of the distribution network real-world test platform, and determining the sum of the capacities of all distributed power supply simulation devices of the distribution network real-world test platform according to the permeability of the distribution network real-world test platform and the rated capacity;
determining installed capacity and types of the accessed distributed power supply simulation devices according to the operation constraint conditions and the sum of the capacities of all the distributed power supply simulation devices;
selecting the access position of the distributed power supply simulation device according to test requirements;
and simulating the faults at different positions of the distribution network real-world test platform according to test requirements so as to perform fault simulation tests.
2. The method for testing the distribution network real-world test platform with access to the distributed power supply of claim 1, wherein the operational constraints comprise a line transmission capacity constraint, a rated capacity constraint of a main transformer, a node voltage constraint and a bus short-circuit current constraint.
3. The method for testing the distribution network real-world test platform with the access to the distributed power supply of claim 1, wherein the access position of the distributed power supply simulation device comprises:
the distributed power supply simulation device is connected with a bus on the distribution network real-time test platform through the reserved interface, the electric energy quality test interface or the indoor dry-type transformer;
the distributed power supply simulation device is connected with a tested device interface of a branch line on the distribution network real-time test platform through a distribution transformer; and the number of the first and second groups,
the distributed power supply simulation device is connected with tested equipment interfaces of branch lines on the distribution network real-time test platform through a distribution transformer and is connected with at least one user charge in parallel.
4. The testing method of the distribution network real-world test platform accessed to the distributed power supply, according to claim 1, wherein the fault simulation test comprises a short-circuit fault simulation test and a ground fault simulation test; the short-circuit fault of the short-circuit fault simulation test is generated by a short-circuit fault simulation unit, and the ground fault of the ground fault simulation test is generated by a ground fault simulation unit.
5. The testing method of the distribution network actual environment testing platform accessed to the distributed power supply of claim 1, wherein the fault occurrence positions of the fault simulation test are divided into three types, namely a fault point located at the upstream of the distributed power supply access point, a fault point located at the downstream of the distributed power supply access point, and a fault point located at the adjacent line of the distributed power supply access point.
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