CN116819201A - Device and method for testing composite function of energy storage converter in distributed new energy - Google Patents
Device and method for testing composite function of energy storage converter in distributed new energy Download PDFInfo
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Abstract
The application provides a composite function testing device and method of an energy storage converter in a distributed new energy source, wherein the device comprises three groups of single-phase modules, each group of single-phase modules comprises an AC/DC module, a DC/AC module and a direct-current supporting capacitor connected between the AC/DC module and the DC/AC module, and the AC/DC module comprises an isolation transformer, a net side pre-charging loop, a net side filtering loop and a net side single-phase full-bridge circuit; the DC/AC module comprises a load side single-phase full-bridge circuit, a load side filter circuit and a load side pre-charge circuit; the AC/DC module is used for direct current constant voltage control, keeps direct current bus voltage, and the DC/AC module performs different control according to different running modes of the device. The application also provides a testing method for the composite function of the distributed new energy/energy storage converter. The application can realize the grid connection and off-grid performance detection of the converter device in the field of distributed new energy, reduce the construction cost of the detection platform and improve the detection efficiency.
Description
Technical Field
The application relates to the fields of distributed new energy, energy storage access and performance detection of an alternating current-direct current power converter, in particular to a device and a method for testing the composite function of an energy storage converter in the distributed new energy.
Background
The power electronic equipment has the advantages of small volume, quick response, high control precision and the like, and has a great deal of application in the fields of power generation, power transmission, power distribution and electricity utilization at present. In the power generation link, photovoltaic, energy storage and partial wind power are connected to a power grid through one-stage conversion of DC-AC or two-stage conversion of AC-DC-AC by a power electronic device; in the transmission link, the advantages of low construction cost, high transmission efficiency and the like of the high-voltage direct-current transmission become the first choice of long-distance transmission, and meanwhile, flexible direct-current transmission (VSC-HVDC) based on a full-control device has a plurality of commercial applications; in a power distribution link, power electronic devices such as a Static Series Compensator (SSC), a Static Voltage Regulator (SVR), a static change-over switch (SSTS), a standby energy storage system (BSES), a power distribution static synchronous compensator (DSTATCOM) and the like are widely used; the application of the power electronic equipment in the power utilization link is wider, such as various direct current power supplies, frequency converters and the like. With the increase of the proportion of the power electronic equipment in the power system, the influence of the power electronic equipment on the conventional power system in aspects of power quality, system stability and the like is not ignored. In order to reduce the influence of power electronic equipment, especially converter equipment applied to distributed new energy power generation, on a power grid after being connected, strict performance detection must be performed before the connection, and the key of the performance detection accuracy is a power electronic detection device, and meanwhile, development of the power electronic detection equipment with a composite function is needed to be developed in consideration of the diversity of the detected equipment.
With the increasing of distributed new energy access, the proportion of power electronic equipment in a power system is increasing, and the single-function detection equipment is currently applied, but the detection equipment with a composite function is not yet intensively studied.
Disclosure of Invention
In view of the above, the application provides a typical topology of an isolated bidirectional converter with functions of a power grid simulator, an electronic load, island detection and a photovoltaic simulator and a corresponding control method thereof based on a modularized design, which can realize grid connection and off-grid performance detection of a converter device in the field of distributed new energy, reduce construction cost of a detection platform and improve detection efficiency.
The application provides a composite function testing device of an energy storage converter in a distributed new energy source, which comprises three groups of single-phase modules, wherein each group of single-phase modules comprises an AC/DC module, a DC/AC module and a direct current support capacitor C2 connected between the AC/DC module and the DC/AC module; the AC/DC module is used for direct current constant voltage control to keep direct current bus voltage, the DC/AC module is used for alternating current voltage/frequency adjustment in a power grid simulator mode, direct current voltage adjustment control in a direct current adjustable power supply mode, constant current control is carried out according to a set photovoltaic curve in a photovoltaic simulator mode, alternating current constant power operation simulation load characteristics are carried out in an electronic load mode, and constant power control is carried out according to the load size in an island detection mode.
Further, the AC/DC module includes an isolation transformer T1, a network side pre-charge circuit, a network side filtering circuit, and a network side single-phase full-bridge circuit U1, which are sequentially connected; the DC/AC module comprises a load side single-phase full-bridge circuit U2, a load side filtering loop and a load side pre-charging loop which are sequentially connected.
Further, the network side pre-charging loop comprises a first switch K1, a resistor R1 and a second switch K2, wherein the first switch K1 is connected with the resistor R1 in series and then connected with the second switch K2 in parallel; the load side pre-charging loop comprises a third switch K3, a resistor R2 and a fourth switch K4, wherein the third switch K3 is connected with the resistor R2 in series and then connected with the fourth switch K4 in parallel.
Further, the method for adjusting the alternating voltage/frequency in the power grid simulator mode specifically comprises the following steps:
step 1: connecting the input side of an AC/DC module with a power grid, and connecting the output side of the DC/AC module with a load or a single-phase converter to be tested;
step 2: the control network side single-phase full-bridge circuit U1 performs rectification operation, and generates direct-current voltage Udc at two ends of the direct-current supporting capacitor C2;
step 3: the single-phase full-bridge circuit U2 at the load side is controlled to perform inversion operation to output alternating current U A’N’ ，U A’N’ The voltage and the frequency are adjustable;
the method for performing direct-current voltage regulation control in the direct-current adjustable power supply mode specifically comprises the following steps:
step 1: connecting the input side of an AC/DC module with a power grid, and connecting the output side of the DC/AC module with a load or a single-phase converter to be tested;
step 2: the control network side single-phase full-bridge circuit U1 performs rectification operation, and generates direct-current voltage Udc at two ends of the direct-current supporting capacitor C2;
step 3: the IGBT module Q3 in the load side single-phase full-bridge circuit U2 is controlled to be kept off, the Q4 is kept on, at the moment, the load side single-phase full-bridge circuit U2 forms a buck circuit, and the IGBT modules Q1 and Q2 are controlled to output the direct-current adjustable voltage U A’N’ Wherein U is A’N’ ＜Udc；
Constant current control is carried out according to a set photovoltaic curve in a photovoltaic simulator mode, and the method specifically comprises the following steps:
step 1: the input side of the AC/DC module is connected with a power grid, and the output side of the DC/AC module is connected with the direct-current end of the converter to be tested;
step 2: setting a maximum power point (Um, im), an open circuit point (Uoc, 0) and a short circuit point (0, isc) of the photovoltaic curve;
step 3: the U-I curve under standard conditions of the photovoltaic panel is plotted according to formula (1):
；
wherein:
；
wherein U is A’N’ For the connected port voltage of the converter to be tested, uoc and Isc are respectively open-circuit voltage and short-circuit current, um and Im are respectively voltage and current at the maximum power point;
step 4: the control network side single-phase full-bridge circuit U1 performs rectification operation, and generates direct-current voltage Udc at two ends of the direct-current supporting capacitor C2;
step 5: IGBT module Q3 in control load side single-phase full-bridge circuit U2 keeps disconnected, Q4 keeps on, uses port voltage U A’N’ For input, determining the current value I to be output according to the set photovoltaic curve A’N’ ；
Step 6: outputting a current value I by controlling the IGBT modules Q1 and Q2 A’N’ Comparing the current with the current Im at the maximum power point to judge whether the converter to be tested has the maximum power point tracking function or not;
the method for simulating load characteristics by alternating current constant power operation in the electronic load mode specifically comprises the following steps:
step 1: the input side of the AC/DC module is connected with the output end of the power supply to be tested, and the output side of the DC/AC module is connected with a power grid;
step 2: after the full-bridge circuit U1 is connected, the full-bridge circuit U1 is controlled to perform rectification operation, and direct-current voltage Udc is generated at two ends of a direct-current supporting capacitor C2;
step 3: constant power control is carried out by a load side single-phase full-bridge circuit U2, and active and reactive outputs are adjusted according to the set load size and load type, so that the simulation of load characteristics is realized;
constant power control is carried out according to the load size in the island detection mode, and the method specifically comprises the following steps:
step 1: the input side of the AC/DC module is connected with the alternating-current side of the single-phase converter to be tested in parallel to be connected with a 220V alternating-current bus, the input side of the AC/DC module is connected with a bidirectional direct-current source, the alternating-current bus is connected with a power grid through a switch QS0, and the QS0 is disconnected;
step 2: after the system is connected, a switch QS0 is closed, the single-phase converter to be tested is started and starts to run in a grid-connected mode, and the output power of the single-phase converter to be tested is P INV ；
Step 3: the control network side single-phase full-bridge circuit U1 is partially connected with a direct current side for constant voltage operation, and the direct current side voltage is Udc;
step 4: the IGBT module Q3 in the part of the control load side single-phase full-bridge circuit U2 is kept open, and the Q4 is kept closed to form a buck loop;
step 5: control the direct current constant power operation of the U2 part of the load side single-phase full-bridge circuit, and output power P m =-P INV ；
Step 6: and after the output power of a part of the grid-side single-phase full-bridge circuit (U1) is stable, the QS0 is disconnected, the single-phase current transformer to be tested is in a isolated grid operation state, if the current transformer has an isolated island detection function, the current transformer can stop operation and is in an isolated island protection state, and otherwise, the current transformer continues to operate.
Furthermore, when the power grid simulator, the three-phase electronic load and the island detection function of the three-phase converter are realized, the input sides and the output sides of the three groups of modules are respectively connected in parallel for running; when the functions of the direct current adjustable power supply and the photovoltaic simulator are realized, the input side is connected in parallel to the power grid, and the output side outputs three paths independently.
A distributed new energy/energy storage converter compound function test method comprises the following steps:
three groups of AC/DC modules and DC/AC modules are connected through a direct current support capacitor C2;
the AC/DC module performs direct current constant voltage control to keep direct current bus voltage, the DC/AC module performs alternating current voltage/frequency adjustment in a power grid simulator mode, performs direct current voltage adjustment control in a direct current adjustable power supply mode, performs constant current control according to a set photovoltaic curve in a photovoltaic simulator mode, performs alternating current constant power operation in an electronic load mode to simulate load characteristics, and performs constant power control according to load size in an island detection mode.
Further, the AC/DC module includes an isolation transformer T1, a network side pre-charge circuit, a network side filtering circuit, and a network side single-phase full-bridge circuit U1, which are sequentially connected; the DC/AC module comprises a load side single-phase full-bridge circuit U2, a load side filtering loop and a load side pre-charging loop which are sequentially connected.
Further, the network side pre-charging loop comprises a first switch K1, a resistor R1 and a second switch K2, wherein the first switch K1 is connected with the resistor R1 in series and then connected with the second switch K2 in parallel; the load side pre-charging loop comprises a third switch K3, a resistor R2 and a fourth switch K4, wherein the third switch K3 is connected with the resistor R2 in series and then connected with the fourth switch K4 in parallel.
Further, the method for adjusting the alternating voltage/frequency in the power grid simulator mode specifically comprises the following steps:
step 1: connecting the input side of an AC/DC module with a power grid, and connecting the output side of the DC/AC module with a load or a single-phase converter to be tested;
step 2: the control network side single-phase full-bridge circuit U1 performs rectification operation, and generates direct-current voltage Udc at two ends of the direct-current supporting capacitor C2;
step 3: control load side single phase fullBridge circuit U2 performs inversion operation to output alternating current U A’N’ ，U A’N’ The voltage and the frequency are adjustable;
the method for performing direct-current voltage regulation control in the direct-current adjustable power supply mode specifically comprises the following steps:
step 1: connecting the input side of an AC/DC module with a power grid, and connecting the output side of the DC/AC module with a load or a single-phase converter to be tested;
step 2: the control network side single-phase full-bridge circuit U1 performs rectification operation, and generates direct-current voltage Udc at two ends of the direct-current supporting capacitor C2;
step 3: the IGBT module Q3 in the load side single-phase full-bridge circuit U2 is controlled to be kept off, the Q4 is kept on, at the moment, the load side single-phase full-bridge circuit U2 forms a buck circuit, and the IGBT modules Q1 and Q2 are controlled to output the direct-current adjustable voltage U A’N’ Wherein U is A’N’ ＜Udc；
Constant current control is carried out according to a set photovoltaic curve in a photovoltaic simulator mode, and the method specifically comprises the following steps:
step 1: the input side of the AC/DC module is connected with a power grid, and the output side of the DC/AC module is connected with the direct-current end of the converter to be tested;
step 2: setting a maximum power point (Um, im), an open circuit point (Uoc, 0) and a short circuit point (0, isc) of the photovoltaic curve;
step 3: the U-I curve under standard conditions of the photovoltaic panel is plotted according to formula (1):
；
wherein:
；
wherein U is A’N’ For the connected port voltage of the converter to be tested, uoc and Isc are respectively open-circuit voltage and short-circuit current, um and Im are respectively voltage and current at the maximum power point;
step 4: the control network side single-phase full-bridge circuit U1 performs rectification operation, and generates direct-current voltage Udc at two ends of the direct-current supporting capacitor C2;
step (a)5: IGBT module Q3 in control load side single-phase full-bridge circuit U2 keeps disconnected, Q4 keeps on, uses port voltage U A’N’ For input, determining the current value I to be output according to the set photovoltaic curve A’N’ ；
Step 6: outputting a current value I by controlling the IGBT modules Q1 and Q2 A’N’ Comparing the current with the current Im at the maximum power point to judge whether the converter to be tested has the maximum power point tracking function or not;
the method for simulating load characteristics by alternating current constant power operation in the electronic load mode specifically comprises the following steps:
step 1: the input side of the AC/DC module is connected with the output end of the power supply to be tested, and the output side of the DC/AC module is connected with a power grid;
step 2: after the full-bridge circuit U1 is connected, the full-bridge circuit U1 is controlled to perform rectification operation, and direct-current voltage Udc is generated at two ends of a direct-current supporting capacitor C2;
step 3: constant power control is carried out by a load side single-phase full-bridge circuit U2, and active and reactive outputs are adjusted according to the set load size and load type, so that the simulation of load characteristics is realized;
constant power control is carried out according to the load size in the island detection mode, and the method specifically comprises the following steps:
step 1: the input side of the AC/DC module is connected with the alternating-current side of the single-phase converter to be tested in parallel to be connected with a 220V alternating-current bus, the input side of the AC/DC module is connected with a bidirectional direct-current source, the alternating-current bus is connected with a power grid through a switch QS0, and the QS0 is disconnected;
step 2: after the system is connected, a switch QS0 is closed, the single-phase converter to be tested is started and starts to run in a grid-connected mode, and the output power of the single-phase converter to be tested is P INV ；
Step 3: the control network side single-phase full-bridge circuit U1 is partially connected with a direct current side for constant voltage operation, and the direct current side voltage is Udc;
step 4: the IGBT module Q3 in the part of the control load side single-phase full-bridge circuit U2 is kept open, and the Q4 is kept closed to form a buck loop;
step 5: control the direct current constant power operation of the U2 part of the load side single-phase full-bridge circuit, and output power P m =-P INV ；
Step 6: and after the output power of a part of the grid-side single-phase full-bridge circuit (U1) is stable, the QS0 is disconnected, the single-phase current transformer to be tested is in a isolated grid operation state, if the current transformer has an isolated island detection function, the current transformer can stop operation and is in an isolated island protection state, and otherwise, the current transformer continues to operate.
Furthermore, when the power grid simulator, the three-phase electronic load and the island detection function of the three-phase converter are realized, the input sides and the output sides of the three groups of modules are respectively connected in parallel for running; when the functions of the direct current adjustable power supply and the photovoltaic simulator are realized, the input side is connected in parallel to the power grid, and the output side outputs three paths independently.
According to the application, the functions of the power grid simulator, the electronic load, the island detection, the direct current adjustable power supply and the photovoltaic simulator can be realized based on the same hardware platform by adopting different control methods according to actual requirements; meanwhile, the modules can run in parallel, detection of a single-phase or three-phase converter is achieved according to requirements, and output of a plurality of direct current sources is achieved. The application can be widely applied to the detection of the power electronic equipment, reduces the input cost of the detection equipment, improves the detection efficiency, ensures that the power electronic equipment connected to the power grid can meet the performance index requirement, and reduces the impact on the power grid after the power electronic equipment is connected.
Drawings
Fig. 1 is a single-module topology diagram of a device for testing a composite function of an energy storage converter in a distributed new energy source according to an embodiment of the application;
FIG. 2 is a single-phase DC adjustable power supply control diagram according to an embodiment of the application;
FIG. 3 is an access topology diagram of an embodiment of the application when the module is used as a photovoltaic simulator;
FIG. 4 is a single-phase electronic load access topology according to an embodiment of the present application;
fig. 5 is an island detection access topology diagram of a single-phase converter device according to an embodiment of the present application;
FIG. 6 is a topology diagram of an embodiment of the application in which both inputs and outputs are operated in parallel;
FIG. 7 is a topology diagram of an input-side parallel output-side independent operation of an embodiment of the present application;
FIG. 8 is a waveform diagram of a power grid simulator functional test in accordance with an embodiment of the present application;
FIG. 9 is a waveform diagram of an electronic load function test according to an embodiment of the present application;
FIG. 10 is a waveform diagram of an island detection function test according to an embodiment of the present application;
FIG. 11 is a waveform diagram of a DC adjustable power function test according to an embodiment of the present application;
fig. 12 is a waveform diagram of a photovoltaic simulator functional test in accordance with an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
As shown in FIG. 1, in the distributed new energy source energy storage converter composite function testing device according to the embodiment of the application, the AN side can be connected with a power grid, and the A 'N' side can be connected with a load side. The single module comprises an isolation transformer, a network side LC filter circuit, a load side LC filter circuit, a pre-charging circuit and a single-phase full-bridge circuit.
The device is integrally formed by three groups of single-phase modules, and each group of single-phase modules comprises an AC/DC module, a DC/AC module and a direct-current supporting capacitor C2 connected between the AC/DC module and the DC/AC module. The AC/DC module comprises an isolation transformer T1, a network side pre-charging loop (K1, R1 and K2), a network side filtering loop (L1, C1) and a network side single-phase full-bridge circuit; the DC/AC module includes a load-side single-phase full-bridge circuit, a load-side filter loop (L2, C3), and a load-side precharge loop (K3, R2, and K4). The network side pre-charging loop comprises a first switch K1, a resistor R1 and a second switch K2, wherein the first switch K1 is connected with the resistor R1 in series and then connected with the second switch K2 in parallel; the load side pre-charging loop comprises a third switch K3, a resistor R2 and a fourth switch K4, wherein the third switch K3 is connected with the resistor R2 in series and then connected with the fourth switch K4 in parallel.
The embodiment of the application also provides a method for testing the composite function of the distributed new energy/energy storage converter, which comprises the following steps: three groups of AC/DC modules and DC/AC modules are connected through a direct current support capacitor C2;
the AC/DC module performs direct current constant voltage control, maintains direct current bus voltage, and is used for performing different control according to different operating modes of the device.
The single module can realize single-phase power grid simulators, direct-current adjustable power supplies, photovoltaic simulators and single-phase electronic loads, and the single-phase converter island detection and functions, and the specific control method is as follows:
(1) Single-phase power grid simulator control method
The control method of the module as a single-phase alternating current adjustable power supply comprises the following steps:
step 1: connecting AN AN end (input side of AN AC/DC module) of the module with a power grid, and connecting AN A 'N' end (output side of the DC/AC module) with a load or a single-phase converter to be tested;
step 2: the control network side single-phase full-bridge circuit U1 performs rectification operation, and generates direct-current voltage Udc at two ends of the direct-current supporting capacitor C2;
step 3: the single-phase full-bridge circuit U2 at the load side is controlled to perform inversion operation to output alternating current U A’N’ ，U A’N’ The voltage and the frequency are adjustable.
(2) DC adjustable power supply control method
Step 1: connecting AN AN end (input side of AN AC/DC module) of the module with a power grid, and connecting AN A 'N' end (output side of the DC/AC module) with a load or a single-phase converter to be tested;
step 2: the control network side single-phase full-bridge circuit U1 performs rectification operation, and generates direct-current voltage Udc at two ends of the direct-current supporting capacitor C2;
step 3: in the control load side single-phase full-bridge circuit U2, the IGBT module Q3 is kept off, the Q4 is kept on, at the moment, the U2 forms a buck circuit as shown in figure 2, and the control IGBT modules Q1 and Q2 can output the direct-current adjustable voltage U A’N’ Wherein U is A’N’ ＜Udc。
(3) Photovoltaic simulator control method
The control method when the single-phase module is used as a photovoltaic simulator is as follows:
step 1: the module access mode is shown in fig. 3, the AN side is connected with a power grid, and the A 'N' end is connected with the direct current end of the converter to be tested;
step 2: setting a maximum power point (Um, im), an open circuit point (Uoc, 0) and a short circuit point (0, isc) of the photovoltaic curve;
step 3: drawing out standard conditions of the photovoltaic panel according to the formula (1)U-I curve at t=25℃):
；
wherein:
；
wherein U is A’N’ For the connected port voltage of the converter to be tested, uoc and Isc are respectively open-circuit voltage and short-circuit current, and Um and Im are respectively voltage and current at the maximum power point.
Step 4: the control network side single-phase full-bridge circuit U1 performs rectification operation, and generates direct-current voltage Udc at two ends of the direct-current supporting capacitor C2;
step 5: in the control load side single-phase full-bridge circuit U2, the IGBT module Q3 is kept off, the Q4 is kept on, and a circuit shown in figure 2 is formed by using the port voltage U A’N’ For input, determining the current value I to be output according to the set photovoltaic curve A’N’ ；
Step 6: outputting a current value I by controlling the IGBT modules Q1 and Q2 A’N’ And comparing the current with the current Im at the maximum power point to judge whether the converter to be tested has the maximum power point tracking function.
(4) Single-phase electronic load control method
The control method when the module is used as a single-phase electronic load is as follows:
step 1: the module access mode is shown in fig. 4, the AN side is connected with the output end of the power supply to be tested, and the A 'N' end is connected with the power grid;
step 2: after the full-bridge circuit U1 is connected, the full-bridge circuit U1 is controlled to perform rectification operation, and direct-current voltage Udc is generated at two ends of a direct-current supporting capacitor C2;
step 3: and the load side single-phase full-bridge circuit U2 is used for constant power control, and active and reactive outputs are adjusted according to the set load size and load type, so that the simulation of load characteristics is realized.
(5) Single-phase island detection control method
The control method when the module is used as single-phase converter island detection equipment is as follows:
step 1: the module is connected into a system to be tested according to the wiring mode shown in fig. 5, wherein AN AN side and AN alternating current side of the single-phase converter to be tested are connected into a 220V alternating current bus in parallel, AN A 'N' end is connected with a bidirectional direct current source, the alternating current bus is connected with a power grid through a switch QS0, and the QS0 is disconnected;
step 2: after the system is connected, a switch QS0 is closed, the single-phase converter to be tested is started and starts to run in a grid-connected mode, and the output power of the single-phase converter to be tested is P INV ；
Step 3: the control network side single-phase full-bridge circuit U1 is partially connected with a direct current side for constant voltage operation, and the direct current side voltage is Udc;
step 4: the IGBT module Q3 in the part of the control load side single-phase full-bridge circuit U2 is kept open, and the Q4 is kept closed to form a buck loop as shown in fig. 2;
step 5: control the direct current constant power operation of the U2 part of the load side single-phase full-bridge circuit, and output power P m =-P INV ；
Step 6: after the output power of the grid-side single-phase full-bridge circuit U1 is stable, the QS0 is disconnected, the single-phase current transformer to be tested is in a isolated grid operation state, if the current transformer has an isolated island detection function, the current transformer can stop operation and is in an isolated island protection state, and otherwise, the current transformer continues to operate.
When a three-phase adjustable power supply is needed or a three-phase converter is tested, a plurality of modules can be operated in parallel according to the need. When the power grid simulator, the three-phase electronic load and the three-phase converter island detection function are realized, the input side and the output side of the three modules can be respectively connected in parallel for operation according to the diagram shown in fig. 6. When the functions of the direct current adjustable power supply and the photovoltaic simulator are realized, the input side can be connected in parallel to the power grid according to the diagram shown in fig. 7, and the output side can independently output three paths. The control method for realizing the functions of the power grid simulator, the electronic load, the island detection, the direct current adjustable power supply and the photovoltaic simulator by the parallel operation of the multiple modules is similar to that of a single module, and is not repeated here.
To verify the feasibility of the topology and control method proposed in the present application, a functional test is now performed based on the three-module parallel operation topology shown in fig. 6, each module rated for 17kW.
Fig. 8 is a functional test waveform of the power grid simulator, wherein fig. 8 (a) is a waveform of each phase voltage when three-phase voltage is reduced by 50%, fig. 8 (b) is a waveform of each phase voltage when single a-phase voltage is reduced by 50%, fig. 8 (c) is a waveform of each phase voltage when an output frequency is adjusted to 49Hz, and fig. 8 (d) is a waveform of each phase voltage when the output frequency is adjusted to 51Hz, and the voltage waveforms are all waveforms of voltages output from the ports of each module U2. Fig. 8 shows that the three modules are connected in parallel to realize the function of the power grid simulator and the output voltage/frequency adjustment.
Fig. 9 is an electronic load function test waveform, with the system simulating a 48kW resistive load.
Fig. 10 is a waveform of an island detection function test, in which Udc is a voltage of a capacitor port between U1 and U2 in the module 1, and a phase current is a U2 side discharge current after being started and adjusted according to output power of a device under test.
FIG. 11 is a waveform of an adjustable DC source function test, wherein Udc is the voltage at the capacitive port between U1 and U2 in module 1, U A’N’ For the dc voltage output by U2 in module 1, it can be seen from the waveform that the module can operate as a dc voltage source as required.
FIG. 12 is a waveform of a photovoltaic simulator functional test, taking a photovoltaic panel open circuit voltage of 600V, a short circuit current of 70A, a voltage at the maximum power point of 477V, a current of 63A, a photovoltaic panel operating environment irradiance of 1000W/square meter, and a temperature of 25 ℃. After the tested device starts to operate at the point A, the module can output response current according to the set photovoltaic curve.
Another embodiment of the present application provides a distributed new energy/energy storage converter composite function test system, including: a computer readable storage medium and a processor;
the computer-readable storage medium is for storing executable instructions;
the processor is used for reading executable instructions stored in the computer readable storage medium and executing the distributed new energy/energy storage converter composite function testing method.
Another embodiment of the present application provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the distributed new energy/energy storage converter composite function test method.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the application without departing from the spirit and scope of the application, which is intended to be covered by the claims.
Claims (10)
1. The utility model provides a compound function test device of energy storage converter among distributed new forms of energy which characterized in that: the system comprises three groups of single-phase modules, wherein each group of single-phase modules comprises an AC/DC module, a DC/AC module and a direct current support capacitor C2 connected between the AC/DC module and the DC/AC module; the AC/DC module is used for direct current constant voltage control to keep direct current bus voltage, the DC/AC module is used for carrying out alternating current voltage/frequency adjustment in a power grid simulator mode, carrying out direct current voltage adjustment control in a direct current adjustable power supply mode, carrying out constant current control according to a set photovoltaic curve in a photovoltaic simulator mode, carrying out alternating current constant power operation simulation load characteristic in an electronic load mode, and carrying out constant power control according to load size in an island detection mode.
2. The distributed new energy converter composite function testing device according to claim 1, wherein: the AC/DC module comprises an isolation transformer T1, a network side pre-charging loop, a network side filtering loop and a network side single-phase full-bridge circuit U1 which are sequentially connected; the DC/AC module comprises a load side single-phase full-bridge circuit U2, a load side filtering loop and a load side pre-charging loop which are sequentially connected.
3. The distributed new energy converter composite function testing device as claimed in claim 2, wherein: the network side pre-charging loop comprises a first switch K1, a resistor R1 and a second switch K2, wherein the first switch K1 is connected with the resistor R1 in series and then connected with the second switch K2 in parallel; the load side pre-charging loop comprises a third switch K3, a resistor R2 and a fourth switch K4, wherein the third switch K3 is connected with the resistor R2 in series and then connected with the fourth switch K4 in parallel.
4. The distributed new energy converter composite function testing device according to claim 3, wherein:
ac voltage/frequency regulation in grid simulator mode, specifically comprising:
step 1: connecting the input side of an AC/DC module with a power grid, and connecting the output side of the DC/AC module with a load or a single-phase converter to be tested;
step 2: the control network side single-phase full-bridge circuit U1 performs rectification operation, and generates direct-current voltage Udc at two ends of the direct-current supporting capacitor C2;
step 3: the single-phase full-bridge circuit U2 at the load side is controlled to perform inversion operation to output alternating current U A’N’ ，U A’N’ The voltage and the frequency are adjustable;
the method for performing direct-current voltage regulation control in the direct-current adjustable power supply mode specifically comprises the following steps:
step 1: connecting the input side of an AC/DC module with a power grid, and connecting the output side of the DC/AC module with a load or a single-phase converter to be tested;
step 2: the control network side single-phase full-bridge circuit U1 performs rectification operation, and generates direct-current voltage Udc at two ends of the direct-current supporting capacitor C2;
step 3: the IGBT module Q3 in the load side single-phase full-bridge circuit U2 is controlled to be kept off, the Q4 is kept on, at the moment, the load side single-phase full-bridge circuit U2 forms a buck circuit,direct-current adjustable voltage U output by IGBT (insulated gate bipolar transistor) modules Q1 and Q2 A’N’ Wherein U is A’N’ ＜Udc；
Constant current control is carried out according to a set photovoltaic curve in a photovoltaic simulator mode, and the method specifically comprises the following steps:
step 1: the input side of the AC/DC module is connected with a power grid, and the output side of the DC/AC module is connected with the direct-current end of the converter to be tested;
step 2: setting a maximum power point (Um, im), an open circuit point (Uoc, 0) and a short circuit point (0, isc) of the photovoltaic curve;
step 3: the U-I curve under standard conditions of the photovoltaic panel is plotted according to formula (1):
；
wherein:
；
wherein U is A’N’ For the connected port voltage of the converter to be tested, uoc and Isc are respectively open-circuit voltage and short-circuit current, um and Im are respectively voltage and current at the maximum power point;
step 4: the control network side single-phase full-bridge circuit U1 performs rectification operation, and generates direct-current voltage Udc at two ends of the direct-current supporting capacitor C2;
step 5: IGBT module Q3 in control load side single-phase full-bridge circuit U2 keeps disconnected, Q4 keeps on, uses port voltage U A’N’ For input, determining the current value I to be output according to the set photovoltaic curve A’N’ ；
Step 6: outputting a current value I by controlling the IGBT modules Q1 and Q2 A’N’ Comparing the current with the current Im at the maximum power point to judge whether the converter to be tested has the maximum power point tracking function or not;
the method for simulating load characteristics by alternating current constant power operation in the electronic load mode specifically comprises the following steps:
step 1: the input side of the AC/DC module is connected with the output end of the power supply to be tested, and the output side of the DC/AC module is connected with a power grid;
step 2: after the full-bridge circuit U1 is connected, the full-bridge circuit U1 is controlled to perform rectification operation, and direct-current voltage Udc is generated at two ends of a direct-current supporting capacitor C2;
step 3: constant power control is carried out by a load side single-phase full-bridge circuit U2, and active and reactive outputs are adjusted according to the set load size and load type, so that the simulation of load characteristics is realized;
constant power control is carried out according to the load size in the island detection mode, and the method specifically comprises the following steps:
step 1: the input side of the AC/DC module is connected with the alternating-current side of the single-phase converter to be tested in parallel to be connected with a 220V alternating-current bus, the input side of the AC/DC module is connected with a bidirectional direct-current source, the alternating-current bus is connected with a power grid through a switch QS0, and the QS0 is disconnected;
step 2: after the system is connected, a switch QS0 is closed, the single-phase converter to be tested is started and starts to run in a grid-connected mode, and the output power of the single-phase converter to be tested is P INV ；
Step 3: the control network side single-phase full-bridge circuit U1 is partially connected with a direct current side for constant voltage operation, and the direct current side voltage is Udc;
step 4: the IGBT module Q3 in the part of the control load side single-phase full-bridge circuit U2 is kept open, and the Q4 is kept closed to form a buck loop;
step 5: control the direct current constant power operation of the U2 part of the load side single-phase full-bridge circuit, and output power P m =-P INV ；
Step 6: and after the output power of a part of the grid-side single-phase full-bridge circuit (U1) is stable, the QS0 is disconnected, the single-phase current transformer to be tested is in a isolated grid operation state, if the current transformer has an isolated island detection function, the current transformer can stop operation and is in an isolated island protection state, and otherwise, the current transformer continues to operate.
5. The distributed new energy converter composite function testing device according to claim 1, wherein: when the power grid simulator, the three-phase electronic load and the three-phase converter island detection function are realized, the input sides and the output sides of the three groups of modules are respectively connected in parallel for operation; when the functions of the direct current adjustable power supply and the photovoltaic simulator are realized, the input side is connected in parallel to the power grid, and the output side outputs three paths independently.
6. The method for testing the composite function of the distributed new energy source/energy storage converter is characterized by comprising the following steps of:
three groups of AC/DC modules and DC/AC modules are connected through a direct current support capacitor C2;
the AC/DC module performs direct current constant voltage control to keep direct current bus voltage, the DC/AC module performs alternating current voltage/frequency adjustment in a power grid simulator mode, performs direct current voltage adjustment control in a direct current adjustable power supply mode, performs constant current control according to a set photovoltaic curve in a photovoltaic simulator mode, performs alternating current constant power operation in an electronic load mode to simulate load characteristics, and performs constant power control according to load size in an island detection mode.
7. The distributed new energy/energy storage converter composite function test method as claimed in claim 6, wherein: the AC/DC module comprises an isolation transformer T1, a network side pre-charging loop, a network side filtering loop and a network side single-phase full-bridge circuit U1 which are sequentially connected; the DC/AC module comprises a load side single-phase full-bridge circuit U2, a load side filtering loop and a load side pre-charging loop which are sequentially connected.
8. The distributed new energy/energy storage converter composite function test method as claimed in claim 7, wherein: the network side pre-charging loop comprises a first switch K1, a resistor R1 and a second switch K2, wherein the first switch K1 is connected with the resistor R1 in series and then connected with the second switch K2 in parallel; the load side pre-charging loop comprises a third switch K3, a resistor R2 and a fourth switch K4, wherein the third switch K3 is connected with the resistor R2 in series and then connected with the fourth switch K4 in parallel.
9. The distributed new energy/energy storage converter composite function test method as claimed in claim 8, wherein:
ac voltage/frequency regulation in grid simulator mode, specifically comprising:
step 1: connecting the input side of an AC/DC module with a power grid, and connecting the output side of the DC/AC module with a load or a single-phase converter to be tested;
step 2: the control network side single-phase full-bridge circuit U1 performs rectification operation, and generates direct-current voltage Udc at two ends of the direct-current supporting capacitor C2;
step 3: the single-phase full-bridge circuit U2 at the load side is controlled to perform inversion operation to output alternating current U A’N’ ，U A’N’ The voltage and the frequency are adjustable;
the method for performing direct-current voltage regulation control in the direct-current adjustable power supply mode specifically comprises the following steps:
step 1: connecting the input side of an AC/DC module with a power grid, and connecting the output side of the DC/AC module with a load or a single-phase converter to be tested;
step 2: the control network side single-phase full-bridge circuit U1 performs rectification operation, and generates direct-current voltage Udc at two ends of the direct-current supporting capacitor C2;
step 3: the IGBT module Q3 in the load side single-phase full-bridge circuit U2 is controlled to be kept off, the Q4 is kept on, at the moment, the load side single-phase full-bridge circuit U2 forms a buck circuit, and the IGBT modules Q1 and Q2 are controlled to output the direct-current adjustable voltage U A’N’ Wherein U is A’N’ ＜Udc；
Constant current control is carried out according to a set photovoltaic curve in a photovoltaic simulator mode, and the method specifically comprises the following steps:
step 1: the input side of the AC/DC module is connected with a power grid, and the output side of the DC/AC module is connected with the direct-current end of the converter to be tested;
step 2: setting a maximum power point (Um, im), an open circuit point (Uoc, 0) and a short circuit point (0, isc) of the photovoltaic curve;
step 3: the U-I curve under standard conditions of the photovoltaic panel is plotted according to formula (1):
；
wherein:
；
wherein U is A’N’ For the connected port voltage of the converter to be tested, uoc and Isc are respectively open-circuit voltage and short-circuit current, um and Im are respectively voltage and current at the maximum power point;
step 4: the control network side single-phase full-bridge circuit U1 performs rectification operation, and generates direct-current voltage Udc at two ends of the direct-current supporting capacitor C2;
step 5: IGBT module Q3 in control load side single-phase full-bridge circuit U2 keeps disconnected, Q4 keeps on, uses port voltage U A’N’ For input, determining the current value I to be output according to the set photovoltaic curve A’N’ ；
Step 6: outputting a current value I by controlling the IGBT modules Q1 and Q2 A’N’ Comparing the current with the current Im at the maximum power point to judge whether the converter to be tested has the maximum power point tracking function or not;
the method for simulating load characteristics by alternating current constant power operation in the electronic load mode specifically comprises the following steps:
step 1: the input side of the AC/DC module is connected with the output end of the power supply to be tested, and the output side of the DC/AC module is connected with a power grid;
step 2: after the full-bridge circuit U1 is connected, the full-bridge circuit U1 is controlled to perform rectification operation, and direct-current voltage Udc is generated at two ends of a direct-current supporting capacitor C2;
step 3: constant power control is carried out by a load side single-phase full-bridge circuit U2, and active and reactive outputs are adjusted according to the set load size and load type, so that the simulation of load characteristics is realized;
constant power control is carried out according to the load size in the island detection mode, and the method specifically comprises the following steps:
step 1: the input side of the AC/DC module is connected with the alternating-current side of the single-phase converter to be tested in parallel to be connected with a 220V alternating-current bus, the input side of the AC/DC module is connected with a bidirectional direct-current source, the alternating-current bus is connected with a power grid through a switch QS0, and the QS0 is disconnected;
step 2: after the system is connected, a switch QS0 is closed, the single-phase converter to be tested is started and starts to run in a grid-connected mode, and the output power of the single-phase converter to be tested is P INV ；
Step 3: the control network side single-phase full-bridge circuit U1 is partially connected with a direct current side for constant voltage operation, and the direct current side voltage is Udc;
step 4: the IGBT module Q3 in the part of the control load side single-phase full-bridge circuit U2 is kept open, and the Q4 is kept closed to form a buck loop;
step 5: control the direct current constant power operation of the U2 part of the load side single-phase full-bridge circuit, and output power P m =-P INV ；
Step 6: and after the output power of a part of the grid-side single-phase full-bridge circuit (U1) is stable, the QS0 is disconnected, the single-phase current transformer to be tested is in a isolated grid operation state, if the current transformer has an isolated island detection function, the current transformer can stop operation and is in an isolated island protection state, and otherwise, the current transformer continues to operate.
10. The distributed new energy/energy storage converter composite function test method as claimed in claim 6, wherein:
when the power grid simulator, the three-phase electronic load and the three-phase converter island detection function are realized, the input sides and the output sides of the three groups of modules are respectively connected in parallel for operation; when the functions of the direct current adjustable power supply and the photovoltaic simulator are realized, the input side is connected in parallel to the power grid, and the output side outputs three paths independently.
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