CN109818366B - New energy generation power hardware-in-loop simulation method and system - Google Patents
New energy generation power hardware-in-loop simulation method and system Download PDFInfo
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- CN109818366B CN109818366B CN201711177702.7A CN201711177702A CN109818366B CN 109818366 B CN109818366 B CN 109818366B CN 201711177702 A CN201711177702 A CN 201711177702A CN 109818366 B CN109818366 B CN 109818366B
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Abstract
A new energy generation power hardware-in-the-loop simulation method and system comprise the following steps: based on a new energy power generation physical simulation platform and a power grid model in a real-time simulation system, constructing a new energy power generation grid-connected power hardware-in-loop system; determining voltage and power grade between interfaces of the software and hardware systems according to the new energy power generation physical system and the real-time simulation system; selecting protection current parameters according to the voltage and power levels of the new energy power generation physical system and the real-time simulation system, and determining hardware protection or software protection; performing stability analysis on the new energy power generation grid-connected power hardware in-loop system; and performing simulation accuracy test on the stable new energy power generation grid-connected power hardware in-loop system. The technical scheme provided by the invention provides systematic guidance and reference for building new energy power generation hardware on the ring simulation platform, and simultaneously provides a high-reliability experimental means for new energy power generation simulation analysis.
Description
Technical Field
The invention relates to a digital-analog hybrid simulation experiment method, in particular to a new energy generation power hardware-in-loop simulation method and system.
Background
The new energy power generation grid-connected research needs a flexible and accurate simulation experiment platform, and meets the research requirements of new energy power generation control strategies, large-scale new energy power generation safety analysis and the like. In the existing hardware in the loop simulation, the control hardware is flexibly configured in the loop simulation due to simple implementation, and is widely applied to verification of a new energy power generation control strategy, but because only signals flow in the system and energy flow is lacking, the physical characteristics of equipment are difficult to truly reflect. The power hardware simulates a large-scale new energy unit/station in a ring simulation by using low-power physical equipment, and the actual test environment is reproduced to the maximum extent through the bidirectional flow of signal flow and energy flow in the system, so that the problems that the accurate modeling of power electronic equipment is difficult and the interaction influence is difficult to analyze in pure digital simulation are solved, the stability and the accuracy of the system are required to be ensured when the power hardware is used for carrying out ring simulation experiments, and the challenges of experiment development are relatively high and the experimental method is relatively poor due to the influence of factors such as signal delay in the system, the accuracy of a simulation model, the fixed step length of a real-time simulator, the capacity limitation of the system and the like.
The existing power hardware-in-loop simulation method mainly analyzes the stability and accuracy of interfaces of a simple voltage division circuit, and is mainly performed in simulation software, when the power hardware consisting of an actual hardware system and a simulation system is in loop simulation, the operability is not strong, and the problem and the development method of the system for presenting the actual power hardware-in-loop simulation experiment are difficult.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a new energy generation power hardware-in-loop simulation method and system.
The technical scheme provided by the invention is as follows:
the hardware-in-the-loop simulation method for the new energy generation power is characterized by comprising the following steps of:
based on a new energy power generation physical simulation platform and a power grid model in a real-time simulation system, constructing a new energy power generation grid-connected power hardware-in-loop system;
determining voltage and power grade between interfaces of the software and hardware systems according to the new energy power generation physical system and the real-time simulation system;
selecting protection current parameters according to the voltage and power levels of the new energy power generation physical system and the real-time simulation system, and determining hardware protection or software protection;
performing stability analysis on the new energy power generation grid-connected power hardware in-loop system;
and performing simulation accuracy test on the stable new energy power generation grid-connected power hardware in-loop system.
Preferably, the building of the new energy power generation grid-connected power hardware-in-the-loop system based on the new energy power generation physical simulation platform and the power grid model in the real-time simulation system includes:
and selecting a power amplifier and a power interface algorithm according to a fan, a photovoltaic and energy storage new energy power generation physical platform and combining a power grid model in a real-time simulation system, and constructing a new energy power generation grid-connected power hardware in-loop system.
Preferably, the hardware protection includes:
the new energy power generation physical system and the power amplifier are configured with electric fault protection, overload protection and overheat protection.
Preferably, the software protection includes:
when the voltage and current signal in the simulation system is detected to be beyond the limit, the current signal of the feedback channel is cut off, meanwhile, the voltage signal output to the power amplifier is continuously maintained, and the system is detected to be recovered to be normal, and the voltage information is cut off.
Preferably, the stability analysis of the new energy power generation grid-connected power hardware in the ring system comprises the following steps:
according to the Nyquist criterion of the interface stability of an ideal transformer model, for a zero-gain power interface, when the impedance of the real-time simulation system is smaller than the impedance of the new energy power generation physical system, the system is stable;
when the voltage and the power grade of the new energy power generation physical system and the voltage and the power grade of the real-time simulation system are different, judging the stability by the following formula:
wherein Z is S (s): simulating the impedance of the system; z is Z H (s): new energy power generation physical system resistorResistance; s is S S : the capacity of an equivalent new energy power generation unit/station access point in the simulation system; s is S H : capacity of the new energy power generation physical system; v (V) H : the voltage level of the new energy power generation physical system; v (V) S : the voltage of the equivalent new energy power generation unit/station access point in the simulation system;
and when the stability can not meet the test requirement, adopting a stability improving method to improve the stability of the new energy power generation grid-connected power hardware in the ring system.
Preferably, when the stability cannot meet the test requirement, the stability improving method is used for improving the stability of the new energy generation grid-connected power hardware in the ring system, and the method comprises the following steps:
under the condition that the topology and parameters of the new energy power generation physical system are known, under the condition that the voltage and capacity of the new energy power generation physical system are unchanged, the interface voltage in the real-time simulation system is improved, the interface capacity is reduced, and the system stability is improved;
and under the condition that the topology and parameters of the new energy power generation physical system are unknown, adopting a stability test scheme to improve the system stability.
Preferably, the stability test method comprises:
under the closed loop state, the current proportion coefficient is increased from zero, and whether the system is stable or not is judged;
when the system is unstable, a low-pass filter is added in a feedback loop of the real-time simulation system, the cut-off frequency of the low-pass filter is reduced, when the cut-off frequency reaches a lower limit, the current proportionality coefficient is reduced, otherwise, whether the system is stable is continuously judged, and when the system is stable, the current proportionality coefficient is continuously increased;
when the system is stable, the current scaling factor continues to increase until the desired current scaling factor value is reached.
Preferably, the current scaling factor k I Calculated as follows:
wherein V is H : the voltage level of the new energy power generation physical system; s is S H : capacity of the new energy power generation physical system; v (V) S : the voltage of the equivalent new energy power generation unit/station access point in the simulation system; s is S S : the capacity of an equivalent new energy power generation unit/station access point in the simulation system; k (k) in : the signal amplification ratio of the input channel.
Preferably, the simulation accuracy test for the stable new energy power generation grid-connected power hardware in the ring system comprises the following steps:
analyzing the delay of the new energy power generation grid-connected power hardware in the interface of the ring system through an open-loop test of the new energy power generation grid-connected power hardware in the ring system, determining whether the delay meets experimental requirements, further determining the simulation precision of the new energy power generation grid-connected power hardware in the ring system on the new energy power generation physical system, and improving the system precision by adopting a precision improving method when the delay can not meet the experimental requirements.
Preferably, when the delay cannot meet the experimental requirement, the accuracy improving method is adopted to improve the accuracy of the system, and the method comprises the following steps:
when the physical system does not present transient processes and the harmonic requirement is not high, the system accuracy is improved by performing phase compensation on the voltage and current of the physical system to eliminate the delay for the system delay;
for inverter interface physical systems, system accuracy is improved by changing the reactive output capability of the inverter.
A new energy generation power hardware-in-the-loop simulation system comprises:
the building module is used for building a new energy power generation grid-connected power hardware-in-loop system based on the new energy power generation physical simulation platform and a power grid model in the real-time simulation system;
the determining module is used for determining the voltage and the power level between interfaces of the software and hardware systems according to the new energy power generation physical system and the real-time simulation system, selecting protection current parameters according to the voltage and the power level of the new energy power generation physical system and the real-time simulation system, and determining hardware protection or software protection;
the stability analysis module is used for carrying out stability analysis on the new energy generation grid-connected power hardware in the ring system;
and the precision analysis module is used for carrying out simulation precision test on the stable new energy generation grid-connected power hardware in-loop system.
Preferably, the stability analysis module includes: a judging unit;
the judging unit is used for judging whether the impedance of the real-time simulation system is smaller than the impedance of the new energy power generation physical system for the zero-gain power interface according to the Nyquist criterion of the stability of the ideal transformer model interface, wherein the system is stable; when the voltage and the power grade of the new energy power generation physical system and the voltage and the power grade of the real-time simulation system are different, judging the stability by the following formula:
wherein Z is S (s): simulating the impedance of the system; z is Z H (s): impedance of the new energy power generation physical system; s is S S : the capacity of an equivalent new energy power generation unit/station access point in the simulation system; s is S H : capacity of the new energy power generation physical system; v (V) H : the voltage level of the new energy power generation physical system; v (V) S : the voltage of the equivalent new energy power generation unit/station access point in the simulation system;
and when the stability can not meet the test requirement, adopting a stability improving method to improve the stability of the new energy power generation grid-connected power hardware in the ring system.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
the technical scheme provided by the invention provides systematic guidance and reference for constructing the new energy power generation power hardware-in-loop simulation platform and developing the power hardware-in-loop simulation experiment, and also provides a highly reliable and widely-adaptive experimental means for new energy power generation simulation analysis, thereby playing an important role in revealing the interaction influence mechanism of new energy power generation and a power grid.
According to the technical scheme provided by the invention, the simulation accuracy is improved by adopting the phase compensation method, and the problem of delay of power hardware in a loop simulation system is solved.
According to the technical scheme provided by the invention, software protection is adopted as a main part, after the protection action, the system is in an open-loop state, the voltage of the hardware system is kept continuously, the excessive action of the hardware protection and the uncontrollability of experiments are reduced, and the safety is relatively high.
Drawings
FIG. 1 is a flow chart of a new energy generation power hardware-in-the-loop simulation method of the invention;
FIG. 2 is an ITM power interface model of the present invention;
FIG. 3 is a software protection scheme of the present invention;
FIG. 4 is a flow chart of a stability test and lift scheme of the present invention;
FIG. 5 is a new energy generation power hardware-in-the-loop simulation platform of the invention;
FIG. 6 is a diagram of the simulation system voltage and current of the power hardware provided by the invention after the loop simulation protection action;
1-a simulation system; a 2-power amplifier; 3-a new energy power generation physical platform; 4-hardware system.
Detailed Description
For a better understanding of the present invention, reference is made to the following description, drawings and examples.
As shown in figure 1, the invention provides a new energy generation power hardware-in-the-loop simulation method and system, wherein the method comprises the following steps:
step 1: based on a new energy power generation physical simulation platform and a power grid model in a real-time simulation system, constructing a new energy power generation grid-connected power hardware-in-loop system;
the new energy power generation physical simulation platform in the step 1 is a 380V and 0-10kW physical platform, and the converter interface can comprise: and a fan, photovoltaic, energy storage and other new energy power generation physical platforms.
The real-time simulation system has the simulation step length reaching the us level, is provided with a high-precision I/O module, meets the requirement of reliably converting a simulation variable into a high-precision signal stream, and can simulate a power grid model.
The power amplifier is a four-quadrant linear power amplifier based on MOSFET, can amplify signals in the simulation system and apply the signals in the hardware system, and can collect voltage and current signals in the hardware system and feed the signals back to the simulation system. The method has good dynamic characteristics, such as quick response time and high bandwidth (20 kHZ), and avoids large delay and error in a power conversion link.
The power interface algorithm is an Ideal Transformer Model (ITM) with high accuracy and easy implementation, as shown in fig. 2, where the ideal transformer model is to equivalent an external physical system to a current source in a simulation system, and the current through feedback is controlled, and meanwhile, the terminal voltage of the current source is applied to the external physical system through a power amplifier.
Step 2: determining voltage and power grade between interfaces of the software and hardware systems according to the new energy power generation physical system and the real-time simulation system;
the voltage class of the new energy power generation physical system in the step 2 is V H Capacity is S H Equivalent new energy power generation unit/station access point voltage in simulation system is V S Capacity is S S The signal amplification ratio of the output channel of the real-time simulation system is k out The signal amplification ratio of the input channel is k in 。
Voltage scaling factor k of physical system and simulation system V Current scaling factor k I The signal processing module in the simulation system is realized.
Step 3: selecting protection current parameters according to the voltage and power levels of the new energy power generation physical system and the real-time simulation system, and determining hardware protection or software protection;
the safety protection in the step 3 comprises hardware protection and software protection, in the hardware protection, the power amplifier is configured with electric fault protection, overload protection and overheat protection functions, the new energy power generation physical system is configured with self electric fault protection, and the hardware protection is the basis of the protection of the new energy power generation grid-connected power hardware in the ring simulation system, so that the hardware system can be prevented from being damaged due to system instability.
The software protection means that a protection model is built in the simulation, as shown in fig. 3, voltage and current signals and the like at the interface are monitored, and once the limit is exceeded, the protection immediately acts to prevent the limit-exceeding signals in the simulation system from entering the hardware system. The protection action scheme is that when the voltage and current signals in the simulation system are over-limit, the current signals of the feedback channel are cut off first, the system is in an open-loop state, meanwhile, the voltage signals output to the power amplifier are continuously maintained until the system is recovered to be normal, and then the voltage signals are cut off, so that the hardware protection of the physical system is excessive, and the external hardware system is prevented from generating unstable high voltage due to sudden loss of voltage excitation.
Step 4: performing stability analysis on the new energy power generation grid-connected power hardware in-loop system;
as shown in fig. 4, the closed-loop stability analysis in step 4 refers to a theoretical analysis of stability using an open-loop function of a closed-loop system, where the stability analysis is as follows:
let Z S And Z H The impedance of the simulation system and the physical system are respectively known according to the Nyquist criterion of the stability of the ITM interface, and when Z is the zero-gain power interface S (s)＜Z H (s) the system is stable; when the voltage and the power grade of the physical system are different from those of the simulation system, the stability criterion is as follows:
therefore, the stability state of the new energy power generation hardware system can be theoretically analyzed through the stability criterion (2) under the condition that the topology and parameters of the new energy power generation hardware system are known, meanwhile, under the condition that the voltage and the capacity of the hardware system are unchanged, the interface voltage in the simulation system is improved, the interface capacity is reduced, the stability of the system can be improved, and a stability test scheme is needed to be adopted to ensure the stability of the system under the condition that the inside of the new energy power generation hardware system is unknown.
The stability test scheme comprises the steps of increasing k from zero under a closed loop state I Until the expected k is reached I If the system is unstable in the process, a low-pass filter needs to be added in a feedback loop in a simulation system, and the pole-zero distribution of the open loop transfer function of the system is changed, so that the system is stabilized, and the cut-off frequency of the low-pass filter is reduced and k is increased I The interaction is carried out, so that the closed loop system is stable under the condition of meeting the requirement of setting the proportion coefficient.
Step 5: and performing simulation accuracy test on the stable new energy power generation grid-connected power hardware in-loop system.
The simulation accuracy in step 5 means that the delay in the closed loop system can cause the reduction of simulation quality, the accuracy of the output waveform changes, the delay of the system interface needs to be analyzed through an open loop test, whether the delay is in a negligible range or not is determined, and if the delay is too large, compensation is needed.
The time delay of the closed loop system refers to the whole process time delay from output to return of unidirectional data, and mainly comprises the time delay of a power amplifier and a sensor, the interactive time delay of an interface and the time delay of a filtering link. The time delay of the four-quadrant linear power amplifier is less than 10 mu s, the time delay of the sensor is less than 1 mu s, and compared with the time delay of a switch power amplifier millisecond level, the time delay of the linear power amplifier is greatly reduced; the interface interaction time delay is the total time delay of the real-time simulation system, which is obtained by carrying out simulation operation and then transmitting the result to a data output interface card, the data output interface card is transmitted to a power amplifier through an analog channel after D/A conversion, and feedback current is input to RTDS operation after A/D conversion through the data input interface card, wherein the time delay is an electromagnetic transient simulation step length; the delay of the filtering link is related to the type and parameter setting of the selected filtering module, so that the filtering effect is achieved, the delay is reduced as much as possible, the proper filtering module is selected according to the harmonic condition, and the low-pass filter added in the current feedback loop is used for ensuring the stability of the system, so that the simulation precision is reduced to a certain extent.
The accuracy improvement scheme is that for dynamic analysis of new energy power generation grid connection, a physical system does not present transient processes, and in the occasion with low harmonic requirements, compensation of system delay can be eliminated through voltage-current phase compensation of the physical system, and for an inverter interface, the physical system can change the phase of current fed back into a simulation system through reactive output capability of an inverter.
FIG. 5 shows a wind power grid-connected power hardware in-loop simulation experiment platform constructed by the method of the invention, and the photovoltaic grid-connected PHIL verification experiment is carried out by the platform to verify the effectiveness of the method.
In fig. 6, the voltage and current of the simulation system after the protection action of the system oscillation instability software are caused by the impedance change of the photovoltaic converter, so that the feedback current is cut off to 0, the system is in an open loop state, and the output voltage is still maintained at a normal value.
The invention also provides a hardware-in-loop simulation system of the new energy generation power, which comprises the following steps:
the building module is used for building a new energy power generation grid-connected power hardware-in-loop system based on the new energy power generation physical simulation platform and a power grid model in the real-time simulation system;
the determining module is used for determining the voltage and the power level between interfaces of the software and hardware systems according to the new energy power generation physical system and the real-time simulation system, selecting protection current parameters according to the voltage and the power level of the new energy power generation physical system and the real-time simulation system, and determining hardware protection or software protection;
the stability analysis module is used for carrying out stability analysis on the new energy generation grid-connected power hardware in the ring system;
the precision analysis module is used for carrying out simulation precision test on the stable new energy generation grid-connected power hardware in-loop system;
the stability analysis module includes: a judging unit and a temperature adjusting unit;
the judging unit is used for judging whether the impedance of the real-time simulation system is smaller than the impedance of the new energy power generation physical system for the zero-gain power interface according to the Nyquist criterion of the stability of the ideal transformer model interface, wherein the system is stable; when the voltage and the power grade of the new energy power generation physical system and the voltage and the power grade of the real-time simulation system are different, judging the stability by the following formula:
wherein Z is S (s): simulating the impedance of the system; z is Z H (s): impedance of the new energy power generation physical system; s is S S : the capacity of an equivalent new energy power generation unit/station access point in the simulation system; s is S H : capacity of the new energy power generation physical system; v (V) H : the voltage level of the new energy power generation physical system; v (V) S : and the voltage of the equivalent new energy power generation unit/station access point in the simulation system.
The stability adjusting unit is configured to, when stability cannot meet test requirements, improve stability of the new energy power generation grid-connected power hardware in a ring system by adopting a stability improving method, and includes:
under the condition that the topology and parameters of the new energy power generation physical system are known, under the condition that the voltage and capacity of the new energy power generation physical system are unchanged, the interface voltage in the real-time simulation system is improved, the interface capacity is reduced, and the system stability is improved; and under the condition that the topology and parameters of the new energy power generation physical system are unknown, adopting a stability test scheme to improve the system stability.
The stability test method comprises the following steps:
under the closed loop state, the current proportion coefficient is increased from zero, and whether the system is stable or not is judged;
when the system is unstable, a low-pass filter is added in a feedback loop of the real-time simulation system, the cut-off frequency of the low-pass filter is reduced, when the cut-off frequency reaches a lower limit, the current proportionality coefficient is reduced, otherwise, whether the system is stable is continuously judged, and when the system is stable, the current proportionality coefficient is continuously increased;
when the system is stable, the current scaling factor continues to increase until the desired current scaling factor value is reached.
The current proportionality coefficient k I Calculated as follows:
wherein V is H : the voltage level of the new energy power generation physical system; s is S H : capacity of the new energy power generation physical system; v (V) S : the voltage of the equivalent new energy power generation unit/station access point in the simulation system; s is S S : the capacity of an equivalent new energy power generation unit/station access point in the simulation system; k (k) in : the signal amplification ratio of the input channel.
The precision analysis module comprises: a judging unit and an accuracy adjusting unit;
the judging unit is used for analyzing the delay of the new energy power generation grid-connected power hardware in the ring system interface through the open-loop test of the new energy power generation grid-connected power hardware in the ring system, determining whether the delay meets experimental requirements or not, and further determining the simulation precision of the new energy power generation grid-connected power hardware in the ring system to the new energy power generation physical system.
The precision adjusting unit is used for improving the system precision by adopting a precision improving method when the time delay cannot meet the experimental requirement, and specifically comprises the following steps:
when the physical system does not present transient processes and the harmonic requirement is not high, the system accuracy is improved by performing phase compensation on the voltage and current of the physical system to eliminate the delay for the system delay;
for inverter interface physical systems, the accuracy of the system is improved by changing the reactive output capability of the inverter.
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.
The foregoing is illustrative of the present invention and is not to be construed as limiting thereof, but rather as providing for the use of additional embodiments and advantages of all such modifications, equivalents, improvements and similar to the present invention are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (10)
1. The hardware-in-the-loop simulation method for the new energy generation power is characterized by comprising the following steps of:
based on a power grid model in a new energy power generation physical system and a real-time simulation system, constructing a new energy power generation grid-connected power hardware-in-the-loop system;
determining voltage and power grade between interfaces of the software and hardware systems according to the new energy power generation physical system and the real-time simulation system;
selecting protection current parameters according to the voltage and power levels of the new energy power generation physical system and the real-time simulation system, and determining hardware protection or software protection;
performing stability analysis on the new energy power generation grid-connected power hardware in-loop system;
performing simulation accuracy test on the stable new energy power generation grid-connected power hardware in-loop system;
the new energy power generation grid-connected power hardware performs stability analysis on a ring system, and comprises the following steps:
according to the Nyquist criterion of the interface stability of an ideal transformer model, for a zero-gain power interface, when the impedance of the real-time simulation system is smaller than the impedance of the new energy power generation physical system, the system is stable;
when the voltage and the power grade of the new energy power generation physical system and the voltage and the power grade of the real-time simulation system are different, judging the stability by the following formula:
wherein Z is S (s): the impedance of the real-time simulation system; z is Z H (s): impedance of the new energy power generation physical system; s is S S : equivalent new energy in real-time simulation systemSource power generation unit/station access point capacity; s is S H : capacity of the new energy power generation physical system; v (V) H : the voltage level of the new energy power generation physical system; v (V) S : equivalent new energy power generation unit/station access point voltage in the real-time simulation system;
and when the stability can not meet the test requirement, adopting a stability improving method to improve the stability of the new energy power generation grid-connected power hardware in the ring system.
2. The method of claim 1, wherein the constructing the new energy generation grid-connected power hardware-in-the-loop system based on the new energy generation physical system and the grid model in the real-time simulation system comprises:
and selecting a power amplifier and a power interface algorithm according to a fan, a photovoltaic and energy storage new energy power generation physical system and combining a power grid model in a real-time simulation system, and constructing a new energy power generation grid-connected power hardware in-loop system.
3. The method of claim 1, wherein the hardware protection comprises:
the new energy power generation physical system and the power amplifier are configured with electric fault protection, overload protection and overheat protection.
4. The method of claim 1, wherein the software protection comprises:
when the voltage and current signal in the real-time simulation system is detected to be beyond the limit, the current signal of the feedback channel is cut off, meanwhile, the voltage signal output to the power amplifier is continuously maintained, and the system is detected to be recovered to be normal, and the voltage information is cut off.
5. The method of claim 1, wherein when the stability cannot meet the test requirement, the method for improving the stability of the new energy generation grid-connected power hardware in the ring system comprises:
under the condition that the topology and parameters of the new energy power generation physical system are known, under the condition that the voltage and capacity of the new energy power generation physical system are unchanged, the interface voltage in the real-time simulation system is improved, the interface capacity is reduced, and the system stability is improved;
and under the condition that the topology and parameters of the new energy power generation physical system are unknown, adopting a stability test scheme to improve the system stability.
6. The method of claim 5, wherein the stability test protocol comprises:
under the closed loop state, the current proportion coefficient is increased from zero, and whether the system is stable or not is judged;
when the system is unstable, a low-pass filter is added in a feedback loop of the real-time simulation system, the cut-off frequency of the low-pass filter is reduced, if the cut-off frequency reaches a lower limit, the current proportionality coefficient is reduced, and if not, whether the system is stable is continuously judged;
when the system is stable, the current scaling factor continues to increase until the desired current scaling factor value is reached.
7. The method of claim 6, wherein the current scaling factor k I Calculated as follows:
wherein V is H : the voltage level of the new energy power generation physical system; s is S H : capacity of the new energy power generation physical system; v (V) S : equivalent new energy power generation unit/station access point voltage in the real-time simulation system; s is S S : equivalent capacity of new energy power generation units/station access points in the real-time simulation system; k (k) in : the signal amplification ratio of the input channel.
8. The method of claim 1, wherein the performing simulation accuracy test on the stable new energy generation grid-connected power hardware in the loop system comprises:
analyzing the delay of the new energy power generation grid-connected power hardware in the interface of the ring system through an open-loop test of the new energy power generation grid-connected power hardware in the ring system, determining whether the delay meets experimental requirements, further determining the simulation precision of the new energy power generation grid-connected power hardware in the ring system on the new energy power generation physical system, and improving the system precision by adopting a precision improving method when the delay can not meet the experimental requirements.
9. The method of claim 8, wherein the improving the system accuracy using the accuracy boost method when the delay fails to meet the experimental requirements comprises:
when the physical system does not present transient processes and the harmonic requirement is not high, the system accuracy is improved by performing phase compensation on the voltage and current of the physical system to eliminate the delay for the system delay;
for inverter interface physical systems, system accuracy is improved by changing the reactive output capability of the inverter.
10. The hardware-in-the-loop simulation system for the new energy generation power is characterized by comprising the following components:
the building module is used for building a new energy power generation grid-connected power hardware-in-loop system based on the new energy power generation physical system and a power grid model in the real-time simulation system;
the determining module is used for determining the voltage and the power level between interfaces of the software and hardware systems according to the new energy power generation physical system and the real-time simulation system, selecting protection current parameters according to the voltage and the power level of the new energy power generation physical system and the real-time simulation system, and determining hardware protection or software protection;
the stability analysis module is used for carrying out stability analysis on the new energy generation grid-connected power hardware in the ring system;
the precision analysis module is used for carrying out simulation precision test on the stable new energy generation grid-connected power hardware in-loop system;
the stability analysis module includes: a judging unit;
the judging unit is used for judging whether the impedance of the real-time simulation system is smaller than the impedance of the new energy power generation physical system for the zero-gain power interface according to the Nyquist criterion of the stability of the ideal transformer model interface, wherein the system is stable; when the voltage and the power grade of the new energy power generation physical system and the voltage and the power grade of the real-time simulation system are different, judging the stability by the following formula:
wherein Z is S (s): the impedance of the real-time simulation system; z is Z H (s): impedance of the new energy power generation physical system; s is S S : equivalent capacity of new energy power generation units/station access points in the real-time simulation system; s is S H : capacity of the new energy power generation physical system; v (V) H : the voltage level of the new energy power generation physical system; v (V) S : equivalent new energy power generation unit/station access point voltage in the real-time simulation system;
and when the stability can not meet the test requirement, adopting a stability improving method to improve the stability of the new energy power generation grid-connected power hardware in the ring system.
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