CN112510695A - Alternating current-direct current hybrid power supply system and impedance online polymerization prediction analysis method thereof - Google Patents

Alternating current-direct current hybrid power supply system and impedance online polymerization prediction analysis method thereof Download PDF

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CN112510695A
CN112510695A CN202011338181.0A CN202011338181A CN112510695A CN 112510695 A CN112510695 A CN 112510695A CN 202011338181 A CN202011338181 A CN 202011338181A CN 112510695 A CN112510695 A CN 112510695A
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converter
source
load
impedance
charge
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CN112510695B (en
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司鑫尧
姜云龙
史明明
张宸宇
刘瑞煌
葛雪峰
肖小龙
苏伟
孙天奎
郭佳豪
缪惠宇
杨景刚
袁晓冬
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses an alternating current-direct current hybrid power supply system and an impedance online polymerization prediction analysis method thereof.A running power of a source converter, a first load converter, a second load converter and a third load converter is changed to respectively obtain an impedance amplitude frequency curve and a corresponding impedance phase frequency curve of the source converter, the first load converter, the second load converter and the third load converter; selecting an impedance amplitude frequency curve corresponding to the total predicted power of the load converter under the current operating condition according to the impedance amplitude frequency curve of the load total converter and a corresponding impedance phase frequency curve; and under the condition of system power balance, judging whether the system direct current port is in a stable state in the prediction time period. The invention can predict and judge whether the system is stable in the future prediction time period in advance, and is convenient to prevent the oscillation instability in advance.

Description

Alternating current-direct current hybrid power supply system and impedance online polymerization prediction analysis method thereof
Technical Field
The invention relates to the technical field of alternating current and direct current mixing, in particular to an impedance online polymerization prediction analysis method for an alternating current and direct current mixed power supply system.
Background
Although the flexible control of power electronic conversion equipment such as new energy, energy storage, alternating current and direct current loads and the like in the alternating current and direct current hybrid power supply system is favorable for rapidly responding to the change of the loads and power supply, the flexibility of the system is improved, and the operation efficiency of the system is improved, at the same time, the operation characteristics and behaviors of the alternating current and direct current hybrid power supply system are also deeply influenced by the nonlinear control characteristics of the power electronic device, because the alternating current and direct current hybrid power supply system shows different impedance characteristics in different frequency bands due to the effect of rapidly switching on/off a large number of power devices controlled by the power electronic device, the system damping is reduced particularly when the direct current loads are increased and the number of interconnected ports is increased, even negative damping is generated, and the stable operation.
The existing impedance stability analysis method for the AC/DC hybrid power supply system mainly comprises the steps of carrying out stability judgment in an off-line mode aiming at a specific operation scene, being incapable of adapting to a real application scene of real-time dynamic change, carrying out impedance on-line analysis according to new energy/load prediction power in a real-time mode, not predicting and judging whether the system is stable in a future prediction time period in advance, not warning in advance to inform operators to take preventive measures to improve the stability of the AC/DC hybrid power supply system, and not preventing oscillation instability of the system in advance.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a stability analysis method of an alternating current and direct current hybrid power supply system, and solves the problem that the existing alternating current and direct current hybrid power supply system cannot perform impedance online analysis in real time according to new energy/load prediction power.
In order to achieve the above purpose, the invention adopts the following technical scheme: an AC/DC hybrid power supply system comprising: the system comprises an alternating current power grid, a source converter, a first load converter, a second load converter, a third load converter, a photovoltaic cell, a fan and a load;
the alternating current power grid, the source converter, the first charge converter and the photovoltaic cell are sequentially connected in series, one end of the second charge converter is connected with the fan, and the other end of the second charge converter is connected with the direct current side of the source converter; and one end of the load converter III is connected with the load, and the other end of the load converter III is connected with the direct current side of the source converter.
Further, the source converter is a voltage source converter, and the load converter is a power source converter.
An impedance online polymerization prediction analysis method for an alternating current-direct current hybrid power supply system comprises the following steps:
through simulation, the operating power of the source converter, the first load converter, the second load converter and the third load converter is changed, and an impedance amplitude frequency curve and a corresponding impedance phase frequency curve of the source converter, the first load converter, the second load converter and the third load converter are obtained respectively;
obtaining an impedance amplitude frequency curve and a corresponding impedance phase frequency curve of the load total converter based on parallel impedance calculation among the load total converter impedance equal to the impedance of the load converter I, the impedance of the load converter II and the impedance of the load converter III;
selecting an impedance amplitude frequency curve corresponding to the total predicted power of the load converter under the current operating condition according to the impedance amplitude frequency curve of the load total converter and a corresponding impedance phase frequency curve;
under the condition of system power balance, judging whether the phase difference of a phase frequency curve of the predicted impedance of the source converter and the load total converter, which corresponds to the impedance cross-point frequency between the nth impedance amplitude frequency curve of the source converter predicted power Pn (source prediction) of the nth power section source converter and the mth impedance amplitude frequency curve of the load total converter predicted power Pm (load total prediction), is greater than 180 degrees, if the phase difference is greater than 180 degrees, judging that a system direct current port in the prediction time period is in an unstable state, otherwise, judging that the system direct current port in the prediction time period is in a stable state.
Further, changing the operating power of the source converter to obtain an impedance amplitude frequency curve and a corresponding impedance phase frequency curve of the source converter includes:
establishing a primary loop model of the source converter based on a simulator, wherein the model comprises: the system comprises an alternating current power grid equivalent model, a source converter primary topological structure model and an equivalent controlled current source of a disturbance source which are sequentially connected in series; the current given signal of the equivalent controlled current source is composed of a steady-state current i0Superposed with disturbance current delta i, the simulator and the secondary controller of the source converter are connected via an electric/communication interfaceDocking to realize the steady-state operation of the hardware of the source converter controller in the loop simulation from 0 to 110% P0N between (sources)1A power segment Pn (source), N1≥ 2，n＝1、2、3……N1，P0(source) is the rated power of the source converter, Pn (source) is 110% × P0(Source). times.n/N1Steady state current i0Pn (source)/U (source), wherein U (source) is rated voltage of the direct current output side of the source converter; pn (source) is the power of the nth power section of the source converter;
the source converter controller hardware sets Δ i to k1 × i when the loop simulation is operating in Pn (source) in steady state0The method comprises the steps of multiplying by sin (2 multiplying by pi multiplying by f1), recording the voltage and the current of the direct current output side of the source converter when the working condition of each disturbance frequency point is simulated and stably operated, carrying out vector division operation to obtain each impedance point of the direct current output side of the source converter under the working conditions of Pn (source) and each disturbance frequency, and connecting the impedance points point by point in sequence to obtain the nth impedance amplitude frequency curve and the corresponding impedance phase frequency curve of the source converter under the nth power segment Pn (source).
Further, changing the operating power of the first load converter to obtain an impedance amplitude frequency curve and a corresponding impedance phase frequency curve of the first load converter, including:
establishing a primary loop model of a first load converter based on a simulator, wherein the model comprises: the method comprises the following steps that an equivalent controlled voltage source I of a disturbance source, a primary topological structure model of a charge converter I and a photovoltaic cell model are sequentially connected in series; the voltage given signal of the equivalent controlled voltage source I is controlled by a first steady-state voltage U01The simulator is connected with a secondary controller of the first load converter through a first electric/communication interface in a butt joint mode, and hardware of the first load converter controller can operate in a loop simulation steady state from 0% to 110% P0N between (charge 1)2One power section Pm1(He 1), N2≥2，m1＝1、2、3……N2，P0(load 1) is the rated power of a first load converter; pm1(Charge 1) ═ 110%. times.P0(lotus 1) × m1/N2；Pm1(lotus 1)) Is a load converter in the m th1The power of each power segment;
load converter-controller hardware in-loop simulation steady state operation in Pm1(charge 1), Δ U1 is set to k2 × U01The disturbance frequency point model is characterized in that x sin (2 x pi x f2), k2 is an amplitude coefficient of a first disturbance voltage, f2 is a disturbance frequency of a first load converter, voltage and current of a connection port of the first load converter and a first equivalent controlled voltage source are recorded when working condition simulation of each disturbance frequency point stably runs, vector division operation is carried out, and the voltage and the current of the connection port of the first load converter and the first equivalent controlled voltage source are obtained through Pm1(load 1) and each impedance point of the connection port of the first load converter and the first equivalent controlled voltage source under each disturbance frequency working condition are sequentially connected point by point to obtain the mth impedance point1One power section Pm1(Charge 1) m th of first down-charge converter1A strip impedance magnitude frequency curve and a corresponding impedance phase frequency curve.
Further, changing the operating power of the second load converter to obtain an impedance amplitude frequency curve and a corresponding impedance phase frequency curve of the second load converter, including:
establishing a primary loop model of a second load converter based on the simulator, wherein the model comprises the following steps: the equivalent controlled voltage source II of the disturbance source, the primary topological structure model of the load converter II and the wind model are sequentially connected in series;
the voltage given signal of the equivalent controlled voltage source II is controlled by a second steady-state voltage U02And the second disturbance voltage delta u2, wherein the simulator is in butt joint with a secondary controller of the second load converter through a second electrical/communication interface, so that the hardware of the second load converter controller can stably operate in a loop simulation state of 0-110% P0N between (charge 2)3One power section Pm2(He 2), N3≥2，m2＝1、2、3……N3，Pm2(charge 2) ═ 110% × P0(lotus 2) × m2/N3；P0(charge 2) is the rated power of the charge converter II;
load converter two-controller hardware in-loop simulation steady state operation in Pm2(charge 2), Δ U2 is set to k3 × U02X sin (2 x pi x f3), k3 is the amplitude coefficient of the second disturbance voltage, f3 is the second disturbance frequency of the load converter,recording the voltage and current of the connection port of the second load converter and the second equivalent controlled voltage source when the working condition of each disturbance frequency point is simulated and stably operated, and performing vector division operation to obtain the voltage and current at Pm2(charge 2) and each impedance point of the connection port of the second charge converter and the second equivalent controlled voltage source under each disturbance frequency working condition are sequentially connected point by point to obtain the mth2One power section Pm2(charge 2) down, m-th of charge converter two2A strip impedance magnitude frequency curve and a corresponding impedance phase frequency curve.
Further, changing the operating power of the third load converter to obtain an impedance amplitude frequency curve and a corresponding impedance phase frequency curve of the third load converter, including:
establishing a primary loop model of a third load converter based on a simulator, wherein the model comprises the following steps: the equivalent controlled voltage source III of the disturbance source, the primary topological structure model of the load converter III and the load model are sequentially connected in series;
the voltage given signal of the equivalent controlled voltage source III is controlled by a third steady-state voltage U03And the simulator is in butt joint with a secondary controller of the third load converter through a third electrical/communication interface, so that the hardware of the third load converter controller can stably operate in a loop simulation state of 0-110% P0N between (charge 3)4One power section Pm3(He 3), N4≥2，m3＝1、2、3……N4，Pm3(Charge 3) ═ 110%. times.P0(lotus 3) × m3/N4；P0(charge 3) is the rated power of the charge converter III;
load converter three-controller hardware in-loop simulation steady state operation in Pm3(charge 3), Δ U3 is set to k4 × U03The multiplied by sin (2 multiplied by pi multiplied by f4), k4 is the amplitude coefficient of the third disturbance voltage, f4 is the disturbance frequency of the third load converter, the voltage and the current of the connection port of the third load converter and the third equivalent controlled voltage source are recorded when the working condition simulation of each disturbance frequency point stably runs, vector division operation is carried out, and the voltage and the current of the connection port of the third load converter and the third equivalent controlled voltage source are obtained in the Pm3(load 3) and each impedance point of the connection port of the load converter III and the equivalent controlled voltage source III under each disturbance frequency working conditionConnecting the lines point by point to obtain the m-th line3One power section Pm3(charge 3) lower, charge converter III m3A strip impedance magnitude frequency curve and a corresponding impedance phase frequency curve.
Further, the total predicted power Pm (total load prediction) of the load converter is Pm1(Charge 1 prediction), Pm2(Charge 2 prediction), Pm3(Charge 3 prediction) vector sum of the three, wherein Pm1(Charge 1 prediction) is the photovoltaic cell prediction power, Pm, corresponding to the first charge converter under the current operation condition2(Charge 2 prediction) is the predicted power, Pm, of the fan corresponding to the second load converter under the current operating condition3(load 3 prediction) power is predicted for the load corresponding to the load converter III under the current operating condition.
Further, the system power balance is: pn (source prediction) is Pm (total load prediction), and Pn (source prediction) is the source converter predicted power.
The invention achieves the following beneficial effects: compared with the existing off-line method, the method disclosed by the invention can be more suitable for real application scenes of real-time dynamic change, can be used for quickly carrying out on-line impedance aggregation prediction analysis in real time according to the predicted power of the new energy/load, can be used for predicting and judging whether the system is stable in a future prediction time period in advance, is convenient for preventing oscillation instability in advance, and provides a new prediction analysis method for stable operation of an alternating current-direct current hybrid power supply system.
Drawings
FIG. 1 is a topology structure diagram of an AC/DC hybrid power supply system;
FIG. 2 is a block diagram of a hardware-in-loop simulation run impedance test of a source converter controller based on a real-time simulator;
FIG. 3 is a block diagram of a real-time simulator-based load converter-controller hardware-in-the-loop simulation run impedance test;
FIG. 4 is a block diagram of a load converter two-controller hardware-in-loop simulation running impedance test based on a real-time simulator;
FIG. 5 is a block diagram of a load converter three-controller hardware-in-loop simulation running impedance test based on a real-time simulator;
fig. 6 is a schematic diagram of stability of an impedance cross-over determination analysis system of a source/load converter of an alternating current/direct current hybrid power supply system.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, an ac/dc hybrid power supply system includes: the system comprises a 10kV alternating current power grid, a source converter, a first load converter, a second load converter, a third load converter, a photovoltaic cell, a fan and a load;
the 10kV alternating current power grid, the source converter, the first load converter and the photovoltaic cell are sequentially connected in series, one end of the second load converter is connected with the fan, and the other end of the second load converter is connected with the direct current side of the source converter; and one end of the load converter III is connected with the load, and the other end of the load converter III is connected with the direct current side of the source converter.
The source converter is a voltage source converter and is used for establishing the voltage of a direct current system;
the load converter is a power source converter and is used for controlling the power exchanged between the alternating current system and the direct current system and controlling the system power flow.
The impedance online polymerization prediction analysis method comprises the following steps: the method comprises the steps of performing steady state simulation operation on each power section of a ring through source/load converter controller hardware, performing equivalent controlled voltage/current source disturbance injection to test an impedance curve, performing online aggregation on a plurality of load converter impedance curves, performing online selection on the source converter impedance curve based on the total predicted power of a plurality of current load converters, and estimating and judging whether a system direct current port is stable in a future prediction time period in advance based on the intersection relation of the power section impedance curves predicted by the source/load total converters.
An on-line polymerization prediction analysis method for impedance of an alternating current-direct current hybrid power supply system comprises the following steps:
step 1, establishing a primary loop model of a source converter in a real-time simulation system, butting a real-time simulator and a secondary controller of the source converter through a first electric/communication interface, and changing the running power of the source converter by changing the disturbance current in the primary loop model of the source converter to obtain an impedance amplitude frequency curve and a corresponding impedance phase frequency curve of the source converter;
as shown in fig. 2, a primary loop model of the source transformer is established based on a real-time simulator, and the model includes: the system comprises a 10kV alternating current power grid equivalent model, a source converter primary topological structure model and an equivalent controlled current source of a disturbance source which are sequentially connected in series;
the current given signal of the equivalent controlled current source is composed of a steady-state current i0The real-time simulator is superposed with disturbance current delta i, the real-time simulator is in butt joint with the secondary controller of the source converter through an electrical/communication interface, wherein the electrical interface comprises a digital input DI (digital input) interface, a digital output DO (digital output), an analog input AI (analog input) interface and an analog input AO (analog input) interface circuit board card, the communication interface comprises communication interface circuits such as RS232, RS485, TCP/IP (transmission control protocol/Internet protocol) and corresponding communication protocols, and the hardware of the source converter controller can respectively realize that the hardware can stably run in a ring simulation manner at 0-110%. P0N between (sources)1A power segment Pn (source), N1Not less than 2, N can be selected1＝500，n＝1、2、3……N1，P0(source) is the rated power of the source converter, Pn (source) is 110% × P0(Source). times.n/N1Steady state current i0Pn (source)/U (source), wherein U (source) is a rated voltage of a direct current output side of the source converter, and an initial value delta i is 0; pn (source) is the power of the nth power section of the source converter;
the controller in-loop simulation is the prior art, and the controller is the actual controller of the converter and needs to be provided by a converter manufacturer. And constructing a current converter and a system model in the simulation system. The simulation model outputs the analog quantity to the controller, and the controller generates the control quantity to return to the simulation model.
The source converter controller hardware sets Δ i to k1 × i when the loop simulation is operating in Pn (source) in steady state0X sin (2 x pi x f1), wherein k1 is an amplitude coefficient of disturbance current, which can generally be 1% to 10%, f1 is disturbance frequency of the source converter, f1 is set to be 1, 2, 3 and 4 … … 1000Hz respectively, voltage and current on the direct current output side of the source converter are recorded when the working condition simulation of each disturbance frequency point stably runs, vector division operation is carried out, and direct current output of the source converter under the working conditions that Pn (source) and the disturbance frequency are 1, 2, 3 and 4 … … 1000Hz respectively is obtainedAnd connecting the impedance points point by point in sequence to obtain an nth impedance amplitude frequency curve and a corresponding impedance phase frequency curve of the source converter under the nth power section Pn (source).
Step 2, establishing a primary loop model of a first load converter in the real-time simulation system, butting the real-time simulator with a secondary controller of the first load converter through a first electrical/communication interface, and changing the running power of the first load converter by changing the disturbance voltage in the primary loop model of the first load converter to obtain an impedance amplitude frequency curve and a corresponding impedance phase frequency curve of the first load converter;
as shown in fig. 3, the method for establishing a primary loop model of a first load converter based on a real-time simulator includes: the method comprises the following steps that an equivalent controlled voltage source I of a disturbance source, a primary topological structure model of a charge converter I and a photovoltaic cell model are sequentially connected in series;
the voltage given signal of the equivalent controlled voltage source I is controlled by a first steady-state voltage U01The real-time simulator is superposed with a first disturbance voltage delta U1, the real-time simulator is in butt joint with a secondary controller of a first load converter through an electrical/communication interface I, wherein the electrical interface comprises a digital input DI (digital input) interface, a digital output DO (digital output), an analog input AI (analog input) interface and an analog input AO (analog input) interface circuit board card, the communication interface comprises communication interface circuits such as RS232, RS485 and TCP/IP (transmission control protocol/Internet protocol) and corresponding communication protocols, and the U/IP interface circuit board card is connected with a second load01The voltage of the DC output side of the source converter is rated as U (source); respectively realizing the steady-state operation of the hardware of the load converter-controller in the loop simulation from 0 to 110% P0N between (charge 1)2One power section Pm1(He 1), N2≥2，m1＝1、2、3……N2，P0(load 1) is the rated power of a first load converter; pm1(Charge 1) ═ 110%. times.P0(lotus 1) × m1/N2；Pm1(charge 1) is a charge converter-in the m-th1The power of each power segment;
load converter-controller hardware in-loop simulation steady state operation in Pm1(charge 1), Δ U1 is set to k2 × U01X sin (2 x pi x f2), k2 is the amplitude coefficient of the first perturbation voltage, which can be 1% to 10% in general, and f2 is the load transformationA disturbance frequency, f2 is set to be 1, 2, 3 and 4 … … 1000Hz respectively, the voltage and the current of a connection port of a first load converter and a first equivalent controlled voltage source are recorded when the working condition of each disturbance frequency point is simulated and stably operated, vector division operation is carried out, and the vector division operation is obtained at Pm1(load 1) and disturbance frequency are each impedance point of the connection port of the first load converter and the first equivalent controlled voltage source under the working condition of 1, 2, 3 and 4 … … 1000Hz respectively, and the m < th > is obtained by connecting the impedance points point by point in sequence1One power section Pm1(Charge 1) m th of first down-charge converter1A strip impedance amplitude frequency curve and a corresponding impedance phase frequency curve;
step 3, establishing a primary loop model of a second load converter in the real-time simulation system, butting the real-time simulator with a secondary controller of the second load converter through a second electrical/communication interface, and changing the operating power of the second load converter by changing the disturbance voltage in the primary loop model of the second load converter to obtain an impedance amplitude frequency curve and a corresponding impedance phase frequency curve of the second load converter;
as shown in fig. 4, a primary loop model of the second load converter is established based on the real-time simulator, and the model includes: the equivalent controlled voltage source II of the disturbance source, the primary topological structure model of the load converter II and the wind model are sequentially connected in series;
the voltage given signal of the equivalent controlled voltage source II is controlled by a second steady-state voltage U02The real-time simulator is connected with a secondary controller of a second load converter through an electrical/communication interface II in an abutting mode, wherein the electrical interface comprises a digital input DI (digital input) interface, a digital output DO (digital output), an analog input AI (analog input) interface circuit board card and an analog input AO (analog input) interface circuit board card, the communication interface comprises communication interface circuits such as RS232, RS485 and TCP/IP (transmission control protocol/Internet protocol) and corresponding communication protocols, and the U/IP interface circuit board card is superposed with a second disturbance voltage delta U202The voltage level of the DC output side of the source converter is U (source); respectively realizing the steady-state operation of the hardware of the two controllers of the load converter in the loop simulation from 0 to 110% P0N between (charge 2)3One power section Pm2(He 2), N3≥2，m2＝1、2、3……N3，Pm2(charge 2) ═ 110% × P0(Lotus 2)×m2/N3；P0(charge 2) is the rated power of the charge converter II;
load converter two-controller hardware in-loop simulation steady state operation in Pm2(charge 2), Δ U2 is set to k3 × U02X sin (2 x pi x f3), k3 is the amplitude coefficient of the second disturbance voltage, generally 1% to 10% can be taken, f3 is the second disturbance frequency of the load converter, f3 is set to be 1, 2, 3 and 4 … … 1000Hz respectively, the voltage and the current of the second direct current output side of the load converter are recorded when the working condition simulation of each disturbance frequency point stably runs, vector division operation is carried out, and the result is that the current at Pm is obtained2(charge 2) and disturbance frequency are respectively 1, 2, 3, 4 … … 1000Hz under the working condition that the charge converter II and the equivalent controlled voltage source II are connected with each impedance point of the connection port in sequence point by point to obtain the m < th > point2One power section Pm2(charge 2) down, m-th of charge converter two2A strip impedance amplitude frequency curve and a corresponding impedance phase frequency curve;
step 4, establishing a primary loop model of a third load converter in the real-time simulation system, butting the real-time simulator with a secondary controller of the third load converter through a third electrical/communication interface, and changing the running power of the third load converter by changing the disturbance voltage in the primary loop model of the third load converter to obtain an impedance amplitude frequency curve of the third load converter and a corresponding impedance phase frequency curve;
as shown in fig. 5, a primary loop model of the third load converter is established based on a real-time simulator, and the model comprises: the equivalent controlled voltage source III of the disturbance source, the primary topological structure model of the load converter III and the load model are sequentially connected in series;
the voltage given signal of the equivalent controlled voltage source III is controlled by a third steady-state voltage U03The real-time simulator is connected with a secondary controller of a third load converter through an electrical/communication interface III in a butt joint mode, wherein the electrical interface III comprises digital input DI, digital output DO, analog input AI and analog input AO interface circuit boards, the communication interface III comprises communication interface circuits such as RS232, RS485 and TCP/IP and corresponding communication protocols, and U is U.S. voltage and delta U303Are implemented separately as U (source)Three-controller hardware of load converter operates in a loop simulation steady state from 0 to 110% P0N between (charge 3)4One power section Pm3(He 3), N4≥2，m3＝1、 2、3……N4，Pm3(Charge 3) ═ 110%. times.P0(lotus 3) × m3/N4；P0(charge 3) is the rated power of the charge converter III;
load converter three-controller hardware in-loop simulation steady state operation in Pm3(charge 3), Δ U3 is set to k4 × U03The multiplied by sin (2 multiplied by pi multiplied by f4), k4 is an amplitude coefficient of a third disturbance voltage, 1% to 10% can be generally taken, f4 is the disturbance frequency of the load converter III, f4 is respectively set to be 1, 2, 3 and 4 … … 1000Hz, the voltage and the current of a connecting port of the load converter III and an equivalent controlled voltage source III are recorded when the working condition simulation of each disturbance frequency point stably runs, vector division operation is carried out, and the voltage and the current of the connecting port of the load converter III and the equivalent controlled voltage source III are obtained at Pm3(charge 3) and disturbance frequency are 1, 2, 3, 4 … … 1000Hz under the working condition that the load converter III and the equivalent controlled voltage source three connecting port each impedance point, the point-by-point connection is carried out in turn, and the m < th > is obtained3One power section Pm3(charge 3) lower, charge converter III m3A strip impedance amplitude frequency curve and a corresponding impedance phase frequency curve;
step 5, based on the calculation of parallel impedance among the load-total converter impedance equal to the impedance of the first load converter, the impedance of the second load converter and the impedance of the third load converter, obtaining an impedance amplitude frequency curve and a corresponding impedance phase frequency curve of the load-total converter in the mth power section Pm (load total), wherein m is m1+ m2+ m 3;
the total predicted power Pm (total load prediction) of the load converter under the current operating condition is Pm1(Charge 1 prediction), Pm2(Charge 2 prediction), Pm3(Charge 3 prediction) vector sum of the three, wherein Pm1(Charge 1 prediction) is the photovoltaic cell prediction power, Pm, corresponding to the first charge converter under the current operation condition2(Charge 2 prediction) is the predicted power, Pm, of the fan corresponding to the second load converter under the current operating condition3(load 3 prediction) predicting power for load corresponding to load converter III under current operating condition according to resistance of load total converterSelecting an m-th impedance amplitude frequency curve corresponding to the total predicted power Pm (total load prediction) of the load converter under the current operating condition on line according to an anti-amplitude frequency curve and a corresponding impedance phase frequency curve;
on the premise of ensuring the power balance of the system, namely on the premise that Pn (source prediction) is equal to Pm (total load prediction), selecting an nth impedance amplitude frequency curve corresponding to the power of a source converter, judging whether the phase difference between the source converter corresponding to the impedance cross-cut point frequency between the nth impedance amplitude frequency curve of the source converter under the nth power section Pn (source prediction) and the mth impedance amplitude frequency curve of the total load converter under the mth power section Pm (total load prediction) and the phase frequency curve of the predicted impedance of the source converter and the total load converter is greater than 180 degrees, if the phase difference is greater than 180 degrees, estimating and judging that a system direct current port in a future prediction time period is in an unstable state, otherwise, estimating and judging that the system direct current port in the future prediction time period is in a stable state.
As shown in fig. 6, in a certain system operating power section, a source converter predicted impedance amplitude frequency curve and a load-total converter predicted impedance amplitude frequency curve intersect at about 8Hz, the phase difference between the two phase frequency curves corresponding to the intersection point is 126 degrees and less than 180 degrees, and the estimated oscillation risk of about 8Hz in a future prediction time period is small; the source converter predicted impedance amplitude frequency curve and the load total converter predicted impedance amplitude frequency curve are additionally intersected at about 35Hz, the phase difference of the two phase frequency curves corresponding to the intersection point is 50 degrees and is far less than 180 degrees, and the estimated oscillation risk of about 35Hz in the future prediction time period is small; thus, the system is stable over a future prediction period, in the frequency range of 1Hz to 1000 Hz.
As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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.

Claims (9)

1. An alternating current-direct current hybrid power supply system is characterized in that: the method comprises the following steps: the system comprises an alternating current power grid, a source converter, a first load converter, a second load converter, a third load converter, a photovoltaic cell, a fan and a load;
the alternating current power grid, the source converter, the first charge converter and the photovoltaic cell are sequentially connected in series, one end of the second charge converter is connected with the fan, and the other end of the second charge converter is connected with the direct current side of the source converter; and one end of the load converter III is connected with the load, and the other end of the load converter III is connected with the direct current side of the source converter.
2. The ac-dc hybrid power supply system according to claim 1, wherein: the source converter is a voltage source converter, and the load converter is a power source converter.
3. An impedance online polymerization prediction analysis method for an alternating current-direct current hybrid power supply system is characterized by comprising the following steps: the method comprises the following steps:
through simulation, the operating power of the source converter, the first load converter, the second load converter and the third load converter is changed, and an impedance amplitude frequency curve and a corresponding impedance phase frequency curve of the source converter, the first load converter, the second load converter and the third load converter are obtained respectively;
obtaining an impedance amplitude frequency curve and a corresponding impedance phase frequency curve of the load total converter based on parallel impedance calculation among the load total converter impedance equal to the impedance of the load converter I, the impedance of the load converter II and the impedance of the load converter III;
selecting an impedance amplitude frequency curve corresponding to the total predicted power of the load converter under the current operating condition according to the impedance amplitude frequency curve of the load total converter and a corresponding impedance phase frequency curve;
under the condition of system power balance, judging whether the phase difference of a phase frequency curve of the predicted impedance of the source converter and the load total converter, which corresponds to the impedance cross-point frequency between the nth impedance amplitude frequency curve of the source converter predicted power Pn (source prediction) of the nth power section source converter and the mth impedance amplitude frequency curve of the load total converter predicted power Pm (load total prediction), is greater than 180 degrees, if the phase difference is greater than 180 degrees, judging that a system direct current port in the prediction time period is in an unstable state, otherwise, judging that the system direct current port in the prediction time period is in a stable state.
4. The method for the online polymerization prediction analysis of the impedance of the alternating current-direct current hybrid power supply system according to claim 3, wherein the method comprises the following steps: changing the operating power of the source converter to obtain an impedance amplitude frequency curve and a corresponding impedance phase frequency curve of the source converter, comprising:
establishing a primary loop model of the source converter based on a simulator, wherein the model comprises: the system comprises an alternating current power grid equivalent model, a source converter primary topological structure model and an equivalent controlled current source of a disturbance source which are sequentially connected in series; current of equivalent controlled current sourceGiven a signal consisting of a steady-state current i0And the simulator is butted with the secondary controller of the source converter through an electric/communication interface, so that the hardware of the controller of the source converter can stably run in a loop simulation state of 0 to 110% P0N between (sources)1A power segment Pn (source), N1≥2，n＝1、2、3……N1，P0(source) is the rated power of the source converter, Pn (source) is 110% × P0(Source). times.n/N1Steady state current i0Pn (source)/U (source), wherein U (source) is rated voltage of the direct current output side of the source converter; pn (source) is the power of the nth power section of the source converter;
the source converter controller hardware sets Δ i to k1 × i when the loop simulation is operating in Pn (source) in steady state0The method comprises the steps of multiplying by sin (2 multiplying by pi multiplying by f1), recording the voltage and the current of the direct current output side of the source converter when the working condition of each disturbance frequency point is simulated and stably operated, carrying out vector division operation to obtain each impedance point of the direct current output side of the source converter under the working conditions of Pn (source) and each disturbance frequency, and connecting the impedance points point by point in sequence to obtain the nth impedance amplitude frequency curve and the corresponding impedance phase frequency curve of the source converter under the nth power segment Pn (source).
5. The method for the online polymerization prediction analysis of the impedance of the alternating current-direct current hybrid power supply system according to claim 3, wherein the method comprises the following steps: changing the operating power of the first load converter to obtain an impedance amplitude frequency curve and a corresponding impedance phase frequency curve of the first load converter, wherein the impedance amplitude frequency curve and the corresponding impedance phase frequency curve comprise:
establishing a primary loop model of a first load converter based on a simulator, wherein the model comprises: the method comprises the following steps that an equivalent controlled voltage source I of a disturbance source, a primary topological structure model of a charge converter I and a photovoltaic cell model are sequentially connected in series; the voltage given signal of the equivalent controlled voltage source I is controlled by a first steady-state voltage U01The simulator is connected with a secondary controller of the first load converter through a first electric/communication interface in a butt joint mode, and hardware of the first load converter controller can operate in a loop simulation steady state from 0% to 110% P0N between (charge 1)2One power section Pm1(He 1), N2≥2，m1＝1、2、3……N2，P0(load 1) is the rated power of a first load converter; pm1(Charge 1) ═ 110%. times.P0(lotus 1) × m1/N2；Pm1(charge 1) is a charge converter-in the m-th1The power of each power segment;
load converter-controller hardware in-loop simulation steady state operation in Pm1(charge 1), Δ U1 is set to k2 × U01The disturbance frequency point model is characterized in that x sin (2 x pi x f2), k2 is an amplitude coefficient of a first disturbance voltage, f2 is a disturbance frequency of a first load converter, voltage and current of a connection port of the first load converter and a first equivalent controlled voltage source are recorded when working condition simulation of each disturbance frequency point stably runs, vector division operation is carried out, and the voltage and the current of the connection port of the first load converter and the first equivalent controlled voltage source are obtained through Pm1(load 1) and each impedance point of the connection port of the first load converter and the first equivalent controlled voltage source under each disturbance frequency working condition are sequentially connected point by point to obtain the mth impedance point1One power section Pm1(Charge 1) m th of first down-charge converter1A strip impedance magnitude frequency curve and a corresponding impedance phase frequency curve.
6. The method for the online polymerization prediction analysis of the impedance of the alternating current-direct current hybrid power supply system according to claim 3, wherein the method comprises the following steps: changing the operating power of the second load converter to obtain an impedance amplitude frequency curve and a corresponding impedance phase frequency curve of the second load converter, wherein the impedance amplitude frequency curve and the corresponding impedance phase frequency curve comprise:
establishing a primary loop model of a second load converter based on the simulator, wherein the model comprises the following steps: the equivalent controlled voltage source II of the disturbance source, the primary topological structure model of the load converter II and the wind model are sequentially connected in series;
the voltage given signal of the equivalent controlled voltage source II is controlled by a second steady-state voltage U02And the second disturbance voltage delta u2, wherein the simulator is in butt joint with a secondary controller of the second load converter through a second electrical/communication interface, so that the hardware of the second load converter controller can stably operate in a loop simulation state of 0-110% P0N between (charge 2)3One power section Pm2(He 2), N3≥2，m2＝1、2、3……N3，Pm2(charge 2) ═ 110% × P0(lotus 2) × m2/N3；P0(charge 2) is the rated power of the charge converter II;
load converter two-controller hardware in-loop simulation steady state operation in Pm2(charge 2), Δ U2 is set to k3 × U02The multiplied by sin (2 multiplied by pi multiplied by f3), k3 is the amplitude coefficient of the second disturbance voltage, f3 is the second disturbance frequency of the load converter, the voltage and the current of the connection port of the second load converter and the second equivalent controlled voltage source are recorded when the working condition simulation of each disturbance frequency point stably runs, vector division operation is carried out, and the voltage and the current of the connection port of the second load converter and the second equivalent controlled voltage source are obtained in the Pm2(charge 2) and each impedance point of the connection port of the second charge converter and the second equivalent controlled voltage source under each disturbance frequency working condition are sequentially connected point by point to obtain the mth2One power section Pm2(charge 2) down, m-th of charge converter two2A strip impedance magnitude frequency curve and a corresponding impedance phase frequency curve.
7. The method for the online polymerization prediction analysis of the impedance of the alternating current-direct current hybrid power supply system according to claim 3, wherein the method comprises the following steps: changing the operating power of the third load converter to obtain an impedance amplitude frequency curve and a corresponding impedance phase frequency curve of the third load converter, wherein the impedance amplitude frequency curve and the corresponding impedance phase frequency curve comprise:
establishing a primary loop model of a third load converter based on a simulator, wherein the model comprises the following steps: the equivalent controlled voltage source III of the disturbance source, the primary topological structure model of the load converter III and the load model are sequentially connected in series;
the voltage given signal of the equivalent controlled voltage source III is controlled by a third steady-state voltage U03And the simulator is in butt joint with a secondary controller of the third load converter through a third electrical/communication interface, so that the hardware of the third load converter controller can stably operate in a loop simulation state of 0-110% P0N between (charge 3)4One power section Pm3(He 3), N4≥2，m3＝1、2、3……N4，Pm3(Charge 3) ═ 110%. times.P0(lotus 3) × m3/N4；P0(lotus)3) The rated power of a third load converter;
load converter three-controller hardware in-loop simulation steady state operation in Pm3(charge 3), Δ U3 is set to k4 × U03The multiplied by sin (2 multiplied by pi multiplied by f4), k4 is the amplitude coefficient of the third disturbance voltage, f4 is the disturbance frequency of the third load converter, the voltage and the current of the connection port of the third load converter and the third equivalent controlled voltage source are recorded when the working condition simulation of each disturbance frequency point stably runs, vector division operation is carried out, and the voltage and the current of the connection port of the third load converter and the third equivalent controlled voltage source are obtained in the Pm3(charge 3) and connecting impedance points of a third connection port of the charge converter and the equivalent controlled voltage source sequentially point by point under the working condition of each disturbance frequency to obtain the mth impedance point3One power section Pm3(charge 3) lower, charge converter III m3A strip impedance magnitude frequency curve and a corresponding impedance phase frequency curve.
8. The method for the online polymerization prediction analysis of the impedance of the alternating current-direct current hybrid power supply system according to claim 3, wherein the method comprises the following steps: the total predicted power Pm of the load converter is Pm1(Charge 1 prediction), Pm2(Charge 2 prediction), Pm3(Charge 3 prediction) vector sum of the three, wherein Pm1(Charge 1 prediction) is the photovoltaic cell prediction power, Pm, corresponding to the first charge converter under the current operation condition2(Charge 2 prediction) is the predicted power, Pm, of the fan corresponding to the second load converter under the current operating condition3(load 3 prediction) power is predicted for the load corresponding to the load converter III under the current operating condition.
9. The method for online polymerization prediction analysis of the impedance of the alternating current-direct current hybrid power supply system according to claim 8, characterized by comprising the following steps: the system power balance is as follows: pn (source prediction) is Pm (total load prediction), and Pn (source prediction) is the source converter predicted power.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102931653A (en) * 2012-11-02 2013-02-13 浙江工业大学 Comprehensive coordination control method of wind-solar direct current micro-grid
CN110556831A (en) * 2019-09-26 2019-12-10 南京航空航天大学 Stability evaluation method and system for multi-machine multi-node power generation system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102931653A (en) * 2012-11-02 2013-02-13 浙江工业大学 Comprehensive coordination control method of wind-solar direct current micro-grid
CN110556831A (en) * 2019-09-26 2019-12-10 南京航空航天大学 Stability evaluation method and system for multi-machine multi-node power generation system

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