CN109375526B - Digital-analog hybrid simulation test platform - Google Patents
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Abstract
A digital-analog hybrid simulation test platform comprises a digital subsystem, a physical subsystem and a digital-analog hybrid simulation interface. The digital subsystem is built based on an eMEGAsim real-time simulator. The physical subsystem is an actual moving die device. The digital-analog hybrid simulation interface is a linear power amplifier interface and a sensing measurer interface which operate in four quadrants. The real-time simulator of the digital subsystem is connected with the input end of a power amplifier interface of the digital-analog hybrid simulation interface, and the output end of the power amplifier interface is connected with the input end of an actual moving die device of the physical subsystem; the sensing measurer interface of the digital-analog hybrid simulation interface is connected with the real-time simulator of the digital subsystem; the digital-analog hybrid simulation test platform realizes the matching of the digital subsystem and the physical subsystem through a digital-analog hybrid simulation interface algorithm, and performs the simulation test of the actual moving die device.
Description
Technical Field
The invention relates to a digital-analog hybrid simulation test platform.
Background
With the increasingly prominent global energy and environmental problems, renewable energy sources such as photovoltaic energy, wind power and the like are rapidly developed, and due to the randomness and fluctuation of the output of the renewable energy sources, the stable operation of a power grid is greatly influenced. Therefore, the impact of renewable energy source grid connection on a power grid can be effectively relieved by using the energy storage system, and a good opportunity is provided for large-scale development of energy storage.
The explosive development of renewable energy and stored energy promotes the generation, upgrading and modification of related equipment. The marketization of a large number of power electronic devices such as photovoltaic inverters, fan rectifiers, energy storage converters and the like also promotes the demonstration application of renewable energy sources and energy storage. However, at present, the test of the devices mainly depends on a fixed power grid or a power grid simulator for power supply, and the representation of the running condition of a real power grid is not accurate enough.
Chinese patent 201310283532.6 discloses a power stage analog hybrid simulation system, which includes: hardware circuit: the device is used for realizing power conversion between a digital side and a physical side and acquiring and inputting feedback signals of the physical side; digital model: the circuit model is used for realizing historical current calculation, delay compensation, digital side current output, physical side voltage acquisition input and decoupling circuit model; and power exchange is carried out between the hardware circuit and the digital model, the hardware circuit connects the digital simulator with the device to be simulated at the physical side, the digital model completes calculation and outputs calculation parameters to the hardware circuit, and meanwhile, the hardware circuit feeds electrical parameters back to the digital model as input, so that power level digital-analog hybrid simulation at the digital side and the physical side is realized. However, the simulation system introduced by the invention is mainly suitable for a large-scale alternating current and direct current hybrid power transmission system.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a digital-analog hybrid simulation test platform. The test platform mainly comprises a digital subsystem, a physical subsystem and a digital-analog hybrid simulation interface. The invention realizes the matching of the digital subsystem and the physical subsystem by a number-mixed-true interface algorithm, and performs simulation test on actual dynamic simulation devices, such as an energy storage converter, a reverse control all-in-one machine, a light storage all-in-one machine and other equipment.
The invention is realized by the following technical scheme:
the digital subsystem is built based on an eMEGAsim real-time simulator, the physical subsystem is an actual moving die device, and the digital-analog hybrid simulation interface comprises a four-quadrant running linear power amplifier interface and a high-precision sensing measurer interface. The real-time simulator of the digital subsystem is connected with the input end of a power amplifier interface of the digital-analog hybrid simulation interface, and the output end of the power amplifier interface is connected with the input end of an actual moving die device of the physical subsystem; and a sensing measurer interface of the digital-analog hybrid simulation interface is connected with a real-time simulator of the digital subsystem.
The invention adopts digital simulation to simulate systems such as a power grid and the like, digital calculation is carried out in a real-time simulator, and the input and the output of the real-time simulator are both digital signals, belonging to a weak current system. The invention adopts a real-time simulator eMEGAsim developed by Quebec research institute of Canada to construct a digital subsystem, wherein the real-time simulator comprises an upper computer, a lower computer, a switch, an industrial network cable and a 1394 cable: the upper computer is a WINDOWS operating system, and software such as MATLAB is embedded; the lower computer is a QNX operating system, and the network card is an industrial network card; the PCs are connected in a daisy chain mode by adopting IEEE 1394 (fire wire), and the bandwidth reaches 400Mb/s and above; the upper computer and the lower computer are connected by an industrial Ethernet. Moreover, a distributed parallel processing idea is adopted, and based on an Intel CoreTM 2Quad multi-core processor and an FPGA technology, multi-rate real-time simulation of a large power grid is realized, and the system can run in microsecond-level small step length in real time, so that various electromagnetic transient processes in the conventional power system are accurately simulated. Therefore, the eMEGAsim simulator is suitable for real-time simulation of large-scale complex power networks, and has strong applicability to new energy and new devices containing a large number of power electronic devices, such as wind turbine generators, photovoltaic power generation, energy storage, FACTS devices, alternating current and direct current power grids and the like.
The physical subsystem of the invention adopts the simulation of an actual moving model device, and real electric power is exchanged on a digital-analog hybrid simulation interface, thereby belonging to a strong electric system. The new device to be tested or the equipment of which the existing model is difficult to accurately express by adopting the mathematical model can be used as a physical subsystem, such as primary power equipment of an energy storage converter, an inverse control all-in-one machine, a light storage all-in-one machine and the like, and secondary power equipment of an intelligent measurement and control protection device, an anti-islanding protection device and the like.
The digital-analog hybrid simulation interface comprises a power amplifier interface and a sensing measurer interface and is used for realizing conversion between different types of data of a digital subsystem and a physical subsystem. The digital-analog hybrid simulation interface is provided with two channels. One of the channels is an amplifying channel from the digital subsystem to the physical subsystem, converts digital quantity obtained by digital simulation into analog quantity which can be accepted by the physical subsystem, amplifies the analog quantity to corresponding power and realizes the amplification through a power amplifier interface. The invention adopts a 21kVA linear power amplifier developed by French Puissance company as an interface for realizing the function, can operate in four quadrants, and has the characteristics of quick response time, higher power capacity and the like. The power amplifier interface comprises a signal input port, a signal amplification part, an aviation plug port with power capable of flowing bidirectionally and an analog resistor part. The signal input port is connected with the digital subsystem real-time simulator and used for receiving a voltage signal from the digital subsystem real-time simulator, the signal input port is also connected with the signal amplification part, the signal amplification part is connected with the aviation plug, the signal input port converts the voltage signal from the digital subsystem real-time simulator into an actual working voltage through the signal amplification part, and the actual voltage is output through the aviation plug. The aviation plug is connected with the analog resistor part, and because the aviation plug port can perform power bidirectional flow, when the energy storage device of the actual moving die device discharges, the operating power of the actual moving die device is transmitted to the analog resistor part through the aviation plug port to be consumed. The other channel of the digital-analog hybrid simulation interface is a sampling feedback channel from the physical subsystem to the digital subsystem, and analog quantity parameters actually operated by the physical subsystem are converted into digital quantity matched with digital simulation through sampling and fed back to the digital subsystem. The sensing measurer interface collects the running current of the actual moving die device through a current sensor arranged on an electric connecting line of the actual moving die device and the power amplifier, converts the running current into a voltage signal, and uploads the voltage signal to the real-time simulator of the digital subsystem through a board card information transmission line, so that sampling feedback from the physical subsystem to the digital subsystem is realized.
The work flow of the simulation test platform of the invention is as follows:
the real-time simulator of the digital subsystem simulates a power grid system, an actual moving die device of the physical subsystem is connected to a certain node in the power grid system for simulation, a node voltage in the power grid system is converted into a voltage signal and transmitted to a power amplifier interface of a digital-analog hybrid simulation interface through a BNC coaxial connecting line, the power amplifier interface amplifies the signal into an actual working voltage, and the actual moving die device of the physical subsystem is connected through a three-phase four-wire aviation plug port; and then, the current sensor of the sensing measurer interface is used for collecting the current in the operation of the actual moving die device, converting the current into a voltage signal, and uploading the voltage signal to the real-time simulator of the digital subsystem through the board card information transmission line, so that the influence of the access of the actual moving die device on the power grid system is analyzed.
The digital-analog hybrid simulation interface algorithm of the invention is as follows:
in order to ensure the authenticity and the accuracy of a digital-analog hybrid simulation experiment, a digital-analog hybrid simulation digital interface algorithm, namely an analog ratio, needs to be set according to factors such as the capacity of an actual moving die device of a physical subsystem, the voltage level of a power grid and the like. The voltage analog ratio is a coefficient of a node voltage signal of an analog power grid needing to be output in the digital subsystem, namely the node voltage multiplied by the voltage analog ratio is a voltage signal value transmitted to the power amplifier by the digital subsystem. And the digital subsystem multiplies the energy storage charging and discharging current instruction obtained by the simulation algorithm by the energy storage charging and discharging current analog ratio to obtain a charging and discharging current instruction of the energy storage device in the actual moving die device. The current signal fed into the digital subsystem through the sensing measurer interface is multiplied by the feed current analog ratio to be the current fed into the analog grid system of the digital subsystem.
(1) Voltage analog ratio
The actual moving mode device of the physical subsystem is connected with the digital subsystem through a power amplifier interface, and the voltage transformation ratio of the power amplifier interface is a fixed value 56.6.
The actual moving die device is connected to the bus phase voltage of the power system as UinThe reference value is Ur(ii) a The actual operation phase voltage of the power amplifier interface is UaThe reference value is 220V, and based on the voltage per unit value equivalent principle:
Ur*ku*56.6＝220 (1)
voltage analog ratio kuComprises the following steps:
ku＝220/(Ur*56.6) (2)
(2) energy storage charge-discharge current analog ratio
The energy storage devices in the actual moving die device have different reference voltages during charging and discharging, and when the energy storage devices are charged, the direct-current side voltage U is usedDCAs a benchmark; when the stored energy is discharged, the voltage U is applied to the AC sideaAs a benchmark; therefore, the digital system relates to two current analog ratios when issuing a charging and discharging current instruction to the actual moving die device of the physical subsystem.
Assuming that the total maximum output power of the energy storage device in the actual moving die device is 2.5kW, and the maximum power required by the energy storage output of the digital subsystem analog power grid system is 2.5MW, the power amplification factor is 1000 times, and the power amplification factor k is setP＝1000。
When energy storage charging is required, the energy storage charging power is PcThen charging current command icComprises the following steps:
ic＝Pc/(kp*UDC) (3)
analog ratio k of charging currentcComprises the following steps:
kc＝1/(kp*UDC) (4)
when energy storage discharge is required, the energy storage discharge power is PdThen discharge current command idComprises the following steps:
id＝Pd/(kp*Ua*3) (5)
discharge current analog ratio kdComprises the following steps:
kd＝1/(3*kp*Ua) (6)
wherein the charging current command icAnd a discharge current command idAre all current values, kpIs a power amplification factor.
(3) Feed current analog ratio
The sensing measurer interface comprises a current sensor and a sampling resistor, the current sensor is arranged on an electrical connecting line of the actual moving die device and the power amplifier, and the sampling resistor is connected with the current sensor in series. Sampling transformation ratio k of current sensors1000:1, and a sampling resistance of 200 Ω. Current sampling signal i fed into real-time simulator of digital subsystem through sensing measurer interfaceinComprises the following steps:
in the formula: i.e. iinFor current sampling signals, i, fed into the real-time emulator of the digital subsystemaIs the current of the actual moving die device.
Based on the power equivalent principle:
P＝3*Uin*iin*ki＝3*Ua*ia*kp (8)
where P is the power fed into the simulated grid system, kiFor feeding current analog ratio, UinSwitching-in of a busbar phase voltage, i, of an electrical power system for an actual moving mould device of a physical subsysteminFor current sampling signals, U, fed into the real-time emulator of the digital subsystemaActually operating the phase voltage, i, for the power amplifier interfaceaIs the current of the actual moving die device.
Feed current analog ratio kiComprises the following steps:
drawings
FIG. 1 is a structural framework diagram of a digital-analog hybrid simulation test platform;
FIG. 2 is a model of a golden light 03 line system of Jinzhai;
FIG. 3 is a diagram of harmonic distortion of current of the energy storage converter;
FIG. 4 is a DC component diagram of the energy storage converter;
fig. 5 is a graph of the power factor of the energy storage converter.
Detailed Description
The invention is further described below with reference to the figures and the detailed description.
Fig. 1 is a structural framework diagram of a digital-analog hybrid simulation test platform, which includes a digital subsystem, a physical subsystem and a digital-analog hybrid simulation interface.
The digital subsystem is built based on an eMEGAsim real-time simulator, the physical subsystem is an actual moving die device, and the digital-analog hybrid simulation interface is a linear power amplifier and a high-precision sensing measurer which operate in four quadrants. The real-time simulator of the digital subsystem is connected with the input end of a power amplifier of the digital-analog hybrid simulation interface, and the output end of the power amplifier is connected with the input end of an actual moving die device of the physical subsystem; and the sensing measurer of the digital-analog hybrid simulation interface is arranged at the electric connecting line of the power amplifier and the actual moving die device and is connected with the real-time simulator of the digital subsystem.
(1) Digital subsystem
The invention adopts digital simulation to simulate a power grid system and carries out digital calculation in a real-time simulator, and the input and the output of the real-time simulator are both digital signals, belonging to a weak current system. The invention adopts a real-time simulator eMEGAsim developed by Quebec research institute of Canada to construct a digital subsystem, wherein the real-time simulator comprises an upper computer, a lower computer, a switch, an industrial network cable and a 1394 cable: the upper computer is a WINDOWS operating system, and software such as MATLAB is embedded; the lower computer is a QNX operating system, and the network card is an industrial network card; the PCs are connected in a daisy chain mode by adopting IEEE 1394 (fire wire), and the bandwidth reaches 400Mb/s and above; the upper computer and the lower computer are connected by an industrial Ethernet. Moreover, a distributed parallel processing idea is adopted, and based on an Intel CoreTM 2Quad multi-core processor and an FPGA technology, multi-rate real-time simulation of a large power grid is realized, and the system can run in microsecond-level small step length in real time, so that various electromagnetic transient processes in the conventional power system are accurately simulated. Therefore, the eMEGAsim simulator is suitable for real-time simulation of large-scale complex power networks, and has strong applicability to new energy and new devices containing a large number of power electronic devices, such as wind turbine generators, photovoltaic power generation, energy storage, FACTS devices, alternating current and direct current power grids and the like.
(2) Physical subsystem
The physical subsystem adopts the simulation of an actual moving die device, real electric power is exchanged on a digital-analog hybrid simulation interface, and the physical subsystem belongs to a strong electric system. The new device to be tested or the equipment of which the existing model is difficult to accurately express by adopting the mathematical model can be used as a physical subsystem, such as primary power equipment of an energy storage converter, an inverse control all-in-one machine, a light storage all-in-one machine and the like, and secondary power equipment of an intelligent measurement and control protection device, an anti-islanding protection device and the like.
(3) Digital-analog hybrid simulation interface
The digital-analog hybrid simulation interface comprises a power amplifier interface and a sensing measurer interface and is used for realizing conversion between different types of data of a digital subsystem and a physical subsystem. The digital-analog hybrid simulation interface is provided with two channels, wherein one channel is an amplification channel from a digital subsystem to a physical subsystem, converts digital quantity obtained by digital simulation into analog quantity which can be accepted by a physical model, amplifies the analog quantity to corresponding power, and is realized through a power amplifier interface. The invention adopts a 21kVA linear power amplifier developed by French Puissance company as an interface for realizing the function, can operate in four quadrants, and has the characteristics of quick response time, higher power capacity and the like. The power amplifier interface comprises a signal input port, a signal amplification part, an aviation plug port with power capable of flowing bidirectionally and an analog resistor part. The signal input port is connected with the digital subsystem real-time simulator and used for receiving a voltage signal from the digital subsystem real-time simulator, the signal input port is also connected with the signal amplification part, the signal amplification part is connected with the aviation plug, the signal input port converts the voltage signal from the digital subsystem real-time simulator into an actual working voltage through the signal amplification part, and the actual voltage is output through the aviation plug. The aviation plug is connected with the analog resistor part, and because the aviation plug port can perform power bidirectional flow, when the energy storage device in the actual moving die device discharges, the operating power of the actual moving die device is transmitted to the analog resistor part through the aviation plug port to be consumed. The other channel of the digital-analog hybrid simulation interface is a sampling feedback channel from the physical subsystem to the digital subsystem, and analog quantity parameters of the physical model in actual operation are converted into digital quantity matched with digital simulation through sampling and are fed back to the digital subsystem. The sensing measurer interface collects the running current of the actual moving die device through a current sensor arranged on an electric connecting line of the actual moving die device and the power amplifier, converts the running current into a voltage signal, and uploads the voltage signal to the real-time simulator of the digital subsystem through a board card information transmission line, so that sampling feedback from the physical subsystem to the digital subsystem is realized.
The work flow of the simulation test platform of the invention is as follows:
the real-time simulator of the digital subsystem simulates a power grid system, a moving die device of the physical subsystem is connected to a certain node in the power grid system for simulation, a node voltage in the power grid system is converted into a voltage signal and transmitted to a power amplifier interface of a digital-analog hybrid simulation interface through a BNC coaxial connecting line, the power amplifier interface amplifies the signal into an actual working voltage, and the actual moving die device of the physical subsystem is connected through a three-phase four-wire aviation plug port; and then, the current sensor of the sensing measurer interface is used for collecting the current in the operation of the actual moving die device, converting the current into a voltage signal, and uploading the voltage signal to the real-time simulator of the digital subsystem through the board card information transmission line, so that the influence of the access of the actual moving die device on the power grid system is analyzed.
Fig. 2 is a golden light 03 line system model of golden village, and the node 57 is used as an access point of the energy storage converter, and the specific calculation of the interface algorithm is as follows:
in order to ensure the authenticity and the accuracy of a digital-analog hybrid simulation experiment, a digital-analog hybrid simulation digital interface algorithm, namely an analog ratio, needs to be set according to factors such as the capacity of an actual moving die device of a physical subsystem, the voltage level of a power grid and the like. The voltage analog ratio is a coefficient of a node voltage signal of an analog power grid needing to be output in the digital subsystem, namely the node voltage multiplied by the voltage analog ratio is a voltage signal value transmitted to the power amplifier by the digital subsystem. And the energy storage charging and discharging current instruction obtained according to the simulation algorithm in the digital subsystem is multiplied by the energy storage charging and discharging current analog ratio to be the charging and discharging current instruction of the energy storage device in the actual moving die device. And multiplying the current signal fed into the digital subsystem by the sensing measurer by the feed current analog ratio to obtain the current fed into the power grid system in the digital subsystem.
(1) Voltage analog ratio
The actual moving mode device of the physical subsystem is connected with the digital subsystem through a power amplifier interface, and the voltage transformation ratio of the power amplifier interface is a fixed value 56.6.
The actual moving die device is connected to the bus phase voltage of the power system as UinThe reference value is Ur(ii) a The actual operation phase voltage of the power amplifier is UaThe reference value is 220V, and based on the voltage per unit value equivalent principle:
Ur*ku*56.6＝220 (1)
voltage analog ratio kuComprises the following steps:
ku＝220/(Ur*56.6) (2)
(2) energy storage charge-discharge current analog ratio
The energy storage devices of the actual moving die device have different reference voltages during charging and discharging, and when the energy storage devices are charged, the direct-current side voltage U is usedDCAs a benchmark; when the stored energy is discharged, the voltage U is applied to the AC sideaAs a benchmark; therefore, the digital system relates to two current analog ratios when issuing a charging and discharging current instruction to the actual moving die device of the physical subsystem.
Assuming that the total maximum output power of the energy storage device is 2.5kW, and the maximum power required by the energy storage output of the power grid system is 2.5MW, the power amplification factor is 1000 times, and the power amplification factor k is setP＝1000。
When energy storage charging is required, the energy storage charging power is PcThen, the charging current command is:
ic＝Pc/(kp*UDC) (3)
charging current modeAnalog kcComprises the following steps:
kc＝1/(kp*UDC) (4)
when energy storage discharge is required, the energy storage discharge power is PdThen, the discharge current command is:
id＝Pd/(kp*Ua*3) (5)
discharge current analog ratio kdComprises the following steps:
kd＝1/(3*kp*Ua) (6)
(3) feed current analog ratio
The sensing measurer interface comprises a current sensor and a sampling resistor, the current sensor is arranged on an electrical connecting line of the actual moving die device and the power amplifier, and the sampling resistor is connected with the current sensor in series. Sampling transformation ratio k of current sensors1000:1, and a sampling resistance of 200 Ω. The current sampling signal fed into the digital simulator through the interface of the sensing measurer is as follows:
in the formula: i.e. iinFor current sampling signals, i, fed into the real-time emulator of the digital subsystemaIs the current of the actual moving die device.
Based on the power equivalent principle:
P＝3*Uin*iin*ki＝3*Ua*ia*kp (8)
where P is the power fed into the simulated grid system, kiFor feeding current analog ratio, UinSwitching-in of a busbar phase voltage, i, of an electrical power system for an actual moving mould device of a physical subsysteminFor current sampling signals, U, fed into the real-time emulator of the digital subsystemaActually operating the phase voltage, i, for the power amplifier interfaceaIs the current of the actual moving die device.
Feed current analog ratio kiComprises the following steps:
fig. 3 is a current harmonic distortion rate diagram of the energy storage converter, the 4kW energy storage converter is connected to a power amplifier of a digital-analog hybrid simulation test platform, and the interface voltage is AC 220V. The energy storage converter is set to work in a current source mode, and a power analyzer is used for measuring the current harmonic distortion rate of the energy storage converter to be 2.7%.
Fig. 4 is a diagram of the dc component of the measured energy storage converter.
Fig. 5 shows the power factor of the energy storage converter with an active power of 2.33kW, which is 1.
Claims (1)
1. A digital-analog hybrid simulation test platform comprises a digital subsystem, a physical subsystem and a digital-analog hybrid simulation interface; the digital subsystem is built based on an eMEGAsim real-time simulator, the physical subsystem is an actual moving die device, and the digital-analog hybrid simulation interface is a linear power amplifier interface and a sensing measurer interface which operate in four quadrants; the real-time simulator of the digital subsystem is connected with the input end of a power amplifier interface of the digital-analog hybrid simulation interface, and the output end of the power amplifier interface is connected with the input end of an actual moving die device of the physical subsystem; the sensing measurer interface of the digital-analog hybrid simulation interface is connected with the real-time simulator of the digital subsystem; the digital-analog hybrid simulation test platform realizes the matching of the digital subsystem and the physical subsystem through a digital-analog hybrid simulation interface algorithm, and carries out the simulation test of the actual dynamic simulation device, and is characterized in that:
the digital-analog hybrid simulation interface algorithm sets a digital-analog hybrid simulation digital interface algorithm, namely an analog ratio, according to the capacity of the actual dynamic simulation device of the physical subsystem and the voltage level of the power grid; the voltage analog ratio is a coefficient of a node voltage signal of an analog power grid system needing to be output in the digital subsystem, namely the node voltage multiplied by the voltage analog ratio is a voltage signal value transmitted to the power amplifier by the digital subsystem; the digital subsystem multiplies the energy storage charging and discharging current instruction obtained according to the simulation algorithm by an energy storage charging and discharging current analog ratio to obtain a charging and discharging current instruction of an energy storage device of the actual moving die device; multiplying a current signal fed into the digital subsystem through the sensing measurer interface by a feed-in current analog ratio to obtain a current fed into the analog power grid system;
the digital-analog hybrid simulation interface comprises a power amplifier interface and a sensing measurer interface and is used for realizing conversion between different types of data of the digital subsystem and the physical subsystem; the digital-analog hybrid simulation interface is provided with two channels, wherein one channel is an amplification channel from a digital subsystem to a physical subsystem, converts digital quantity obtained by digital simulation into analog quantity which can be accepted by the physical subsystem, amplifies the analog quantity to corresponding power and realizes the purpose through a power amplifier interface; the other channel of the digital-analog hybrid simulation interface is a sampling feedback channel from the physical subsystem to the digital subsystem, analog quantity parameters actually operated by the physical subsystem are converted into digital quantity matched with digital simulation through sampling, the digital quantity is fed back to the digital subsystem, and the digital quantity is realized through a sensing measurer interface;
the power amplifier interface comprises a signal input port, a signal amplification part, an aviation plug port with power capable of bidirectionally flowing and an analog resistance part; the signal input port is connected with the digital subsystem real-time simulator and used for receiving a voltage signal from the digital subsystem real-time simulator, the signal input port is also connected with the signal amplification part, the signal amplification part is connected with the aviation plug, the signal input port converts the voltage signal from the digital subsystem real-time simulator into an actual working voltage through the signal amplification part, and the actual voltage is output through the aviation plug; the aviation plug is connected with the analog resistance part, and when the energy storage device of the actual moving die device discharges, the running power of the actual moving die device is transmitted to the analog resistance part through the aviation plug port to be consumed;
the sensing measurer interface collects the running current of the actual moving die device through a current sensor arranged on an electric connecting line of the actual moving die device and the power amplifier, converts the running current into a voltage signal, and uploads the voltage signal to the real-time simulator of the digital subsystem through a board card information transmission line to realize sampling feedback from the physical subsystem to the digital subsystem;
the sensing measurer interface of the digital-analog hybrid simulation interface comprises a current sensor and a sampling resistor, the current sensor is arranged on an electric connecting line of an actual moving die device and a power amplifier, and the sampling resistor is connected with the current sensor in series;
the working process of the simulation test platform is as follows:
the real-time simulator of the digital subsystem simulates a power grid system, an actual moving die device of the physical subsystem is connected to a certain node in the power grid system for simulation, a node voltage in the power grid system is converted into a voltage signal, the voltage signal is transmitted to a power amplifier interface of a digital-analog hybrid simulation interface through a BNC coaxial connecting line, the signal is amplified into an actual working voltage through the power amplifier interface, and the actual moving die device of the physical subsystem is connected through an aviation plug port; then, collecting the running current of the actual moving die device through a current sensor of a sensing measurer interface, converting the running current into a voltage signal, uploading the voltage signal to a real-time simulator of a digital subsystem through a board card information transmission line, and further analyzing the influence of the access of the actual moving die device on a power grid system;
the digital-analog hybrid simulation interface algorithm is specifically as follows:
(1) voltage analog ratio
The actual moving die device of the physical subsystem is connected with the digital subsystem through a power amplifier interface, and the voltage transformation ratio of the power amplifier interface is a fixed value of 56.6;
the actual moving die device is connected to the bus phase voltage of the power system as UinThe reference value is Ur(ii) a The actual operation phase voltage of the power amplifier is UaThe reference value is 220V, and based on the voltage per unit value equivalent principle:
Ur*ku*56.6＝220 (1)
voltage analog ratio kuComprises the following steps:
ku＝220/(Ur*56.6) (2)
(2) energy storage charge-discharge current analog ratio
Energy storage movable die device is benchmark when charging and dischargingDifferent voltages, when charging the stored energy, with a DC side voltage UDCAs a benchmark; when the stored energy is discharged, the voltage U is applied to the AC sideaFor reference, the digital subsystem issues a charge/discharge current command to the actual moving die device of the physical subsystem, and two current analog ratios are involved:
assuming that the total maximum output power of the energy storage device in the actual moving die device is 2.5kW, and the maximum power required by the energy storage output of the simulation power grid system is 2.5MW, the power amplification factor is 1000 times, and the power amplification factor k is setP＝1000；
When energy storage charging is required, the energy storage charging power is PcThen charging current command icComprises the following steps:
ic＝Pc/(kp*UDC) (3)
analog ratio k of charging currentcComprises the following steps:
kc＝1/(kp*UDC) (4)
when energy storage discharge is required, the energy storage discharge power is PdThen discharge current command idComprises the following steps:
id＝Pd/(kp*Ua*3) (5)
discharge current analog ratio kdComprises the following steps:
kd＝1/(3*kp*Ua) (6)
in the formula, kpIs a power amplification factor;
(3) feed current analog ratio
Current sensor sampling transformation ratio k of sensing measurer interface of digital-analog hybrid simulation interfaces1000:1, and 200 omega of sampling resistance; current sampling signal i fed into real-time simulator of digital subsystem through sensing measurer interfaceinComprises the following steps:
in the formula: i.e. iinFor current sampling signals, i, fed into the real-time emulator of the digital subsystemaIs the current of the actual moving die device;
based on the power equivalent principle:
P＝3*Uin*iin*ki＝3*Ua*ia*kp (8)
where P is the power fed into the simulated grid system, kiFor feeding current analog ratio, UinSwitching-in of a busbar phase voltage, i, of an electrical power system for an actual moving mould device of a physical subsysteminFor current sampling signals, U, fed into the real-time emulator of the digital subsystemaActually operating the phase voltage, i, for the power amplifier interfaceaIs the actual current of the actual moving die device;
feed current analog ratio kiComprises the following steps:
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| CN110502818B (en) * | 2019-08-13 | 2022-08-23 | 广西电网有限责任公司电力科学研究院 | Accuracy evaluation method for multi-power interface digital-analog hybrid simulation system |
| CN111025060B (en) * | 2019-12-13 | 2022-04-12 | 中国科学院电工研究所 | Testing method of grid-connected inverse control all-in-one machine |
| CN111624895B (en) * | 2020-05-07 | 2023-10-03 | 中国科学院电工研究所 | Real-time power grid simulation system |
| CN114185280B (en) * | 2021-12-06 | 2023-11-21 | 国网湖南省电力有限公司 | Energy storage power station semi-physical real-time simulation architecture construction method based on embedded system |
| CN115792450A (en) * | 2022-11-29 | 2023-03-14 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Simulation test system and performance detection method for hybrid energy storage converter |
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