CN105720572A - Direct-current micro-grid secondary voltage regulation system and control method thereof - Google Patents
Direct-current micro-grid secondary voltage regulation system and control method thereof Download PDFInfo
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention relates to a direct-current micro-grid voltage regulation system and particularly relates to a direct-current micro-grid secondary voltage regulation system and a control method thereof, aiming at the solving the problem that voltage of a direct-current bus cannot be regulated to a rated value by a traditional direct-current micro-grid droop voltage regulation system. The direct-current micro-grid voltage regulation system comprises a vanadium battery energy storage system and a voltage regulation controller, wherein the vanadium battery energy storage system comprises a vanadium battery, a bidirectional DC/DC (Direct Current/Direct Current) converter and a vanadium battery detector; the vanadium battery is connected with the direct-current bus through the bidirectional DC/DC converter; the vanadium battery detector is connected with the vanadium battery; and the voltage regulation controller is connected with the direct-current bus, the vanadium battery detector, the bidirectional DC/DC converter in the vanadium battery energy storage system, a second bidirectional DC/DC converter in a mixed energy storage system, and a bidirectional DC/AC (Direct Current/Alternating Current) converter in a connected-grid system. The direct-current micro-grid secondary voltage regulation system is suitable for direct-current micro-grids.
Description
Technical field
The present invention relates to direct-current grid voltage-regulating system, specifically a kind of direct-current grid secondary voltage-regulating system and control method thereof.
Background technology
Direct-current grid is simple because of its control mode, it is not necessary to consider reactive power, frequency, Phase synchronization, not only can islet operation but also the series of advantages such as can be incorporated into the power networks, earned widespread respect in recent years.As it is shown in figure 1, direct-current grid involved in the present invention is made up of dc bus, photovoltaic generating system, mixed energy storage system (HybridEnergyStorageSystem, HESS), grid-connected system and loaded portion.Wherein, photovoltaic generating system is made up of photovoltaic array, boost changer.Mixed energy storage system is made up of lithium battery group, the first two-way DC/DC changer, ultracapacitor, the second two-way DC/DC changer.Grid-connected system is made up of bulk power grid, isolating transformer, two-way DC/AC changer.Loaded portion is made up of buck converter, DC load.
Sign direct-current grid is properly functioning, the system power most important index of balance is DC bus-bar voltage.Due to the randomness of the undulatory property of photovoltaic generation power and load power, DC bus-bar voltage often occurs fluctuation to deviate its rated value.Therefore, in order to ensure that direct-current grid is properly functioning, certainly will need to arrange direct-current grid voltage-regulating system (being responsible for regulating DC bus-bar voltage).Traditional direct-current grid voltage-regulating system is to adopt droop control method to regulate DC bus-bar voltage.Practice have shown that, this kind of voltage-regulating system is limit due to self principle, DC bus-bar voltage cannot be regulated to its rated value (namely when direct-current grid stable operation, all the time there is certain deviation relative to its rated value in DC bus-bar voltage), thus affect load power supply quality and the running efficiency of system of direct-current grid, thus affecting the economy of DC micro-electric network operation.Based on this, it is necessary to invent a kind of brand-new direct-current grid voltage-regulating system, DC bus-bar voltage cannot be regulated to the problem of its rated value solving traditional direct-current grid sagging voltage-regulating system.
Summary of the invention
The present invention is to solve that DC bus-bar voltage cannot be regulated the problem to its rated value by the sagging voltage-regulating system of traditional direct-current grid, it is provided that a kind of direct-current grid secondary voltage-regulating system and control method thereof.
The present invention adopts the following technical scheme that realization:
A kind of direct-current grid secondary voltage-regulating system, including vanadium energy storage system, voltage regulator controllers；
Described vanadium energy storage system includes vanadium cell, two-way DC/DC changer, vanadium cell detector；
Vanadium cell is connected with dc bus by two-way DC/DC changer；Vanadium cell detector is connected with vanadium cell；
Voltage regulator controllers is connected with the second two-way DC/DC changer in the two-way DC/DC changer in dc bus, vanadium cell detector, vanadium energy storage system, mixed energy storage system, the two-way DC/AC changer in grid-connected system respectively.
A kind of control method (the method is based on a kind of direct-current grid secondary voltage-regulating system of the present invention and realizes) of direct-current grid secondary voltage-regulating system, the method is to adopt following steps to realize:
A. voltage regulator controllers selects once sagging voltage-regulating system according to the running status of direct-current grid:
If direct-current grid is in island operation state, then served as once sagging voltage-regulating system by mixed energy storage system, then perform step B；
If direct-current grid is in the state of being incorporated into the power networks, then served as once sagging voltage-regulating system by grid-connected system, then perform step C；
B. the second two-way DC/DC changer that voltage regulator controllers controls in mixed energy storage system switches to sagging pressure regulation pattern, according to DC bus-bar voltage U nowdcA pressure regulation is carried out with droop characteristic (as shown in Figure 5)；Then, step D is performed；
C. the two-way DC/AC changer that voltage regulator controllers controls in grid-connected system switches to sagging pressure regulation pattern, according to DC bus-bar voltage U nowdcA pressure regulation is carried out with droop characteristic (as shown in Figure 6)；Then, step D is performed；
D. voltage regulator controllers gathers DC bus-bar voltage Udc, and judge DC bus-bar voltage UdcVariation delta U within the Δ t timedcWhether less than threshold value δ；
If DC bus-bar voltage UdcVariation delta U within the Δ t timedcBeing not less than threshold value δ, then show that the operation of direct-current grid is not up to stable state, now circulation performs step D；
If DC bus-bar voltage UdcVariation delta U within the Δ t timedcLess than threshold value δ, then show that the operation of direct-current grid reaches stable state, now perform step E；
E. voltage regulator controllers detects the state-of-charge SOC of vanadium cell in real time by vanadium cell detectorVRB, and judge the state-of-charge SOC of vanadium cellVRBWhether beyond normal range of operation；
If the state-of-charge SOC of vanadium cellVRBWithout departing from normal range of operation, and direct-current grid is in island operation state, then perform step F；
If the state-of-charge SOC of vanadium cellVRBWithout departing from normal range of operation, and direct-current grid is in the state of being incorporated into the power networks, then perform step G；
If the state-of-charge SOC of vanadium cellVRBBeyond normal range of operation, then circulation performs step E；
F. the second two-way DC/DC changer that voltage regulator controllers controls in mixed energy storage system is switched to power blockage pattern by sagging pressure regulation pattern, and the output of mixed energy storage system is thus locked as currency；Then, the two-way DC/DC changer that voltage regulator controllers controls in vanadium energy storage system is switched to double-closed-loop control pattern by idle pulley, and vanadium energy storage system is thus by DC bus-bar voltage UdcRegulate to its rated value Udcr, thus realizing DC bus-bar voltage UdcZero error Secondary Control；Then, step H is performed；
G. the two-way DC/AC changer that voltage regulator controllers controls in grid-connected system is switched to power blockage pattern by sagging pressure regulation pattern, and the output of grid-connected system is thus locked as currency；Then, the two-way DC/DC changer that voltage regulator controllers controls in vanadium energy storage system is switched to double-closed-loop control pattern by idle pulley, and vanadium energy storage system is thus by DC bus-bar voltage UdcRegulate to its rated value Udcr, thus realizing DC bus-bar voltage UdcZero error Secondary Control；Then, step H is performed；
H. voltage regulator controllers detects the output P of vanadium energy storage system in real time by vanadium cell detectorVRB, and judge the output P of vanadium energy storage systemVRBWhether reach threshold value ± PTOr 0；Meanwhile, voltage regulator controllers detects the state-of-charge SOC of vanadium cell in real time by vanadium cell detectorVRB, and judge the state-of-charge SOC of vanadium cellVRBWhether beyond normal range of operation；
If the output P of vanadium energy storage systemVRBNot up to threshold value ± PTOr 0, and the state-of-charge SOC of vanadium cellVRBWithout departing from normal range of operation, then circulation performs step H；
If the output P of vanadium energy storage systemVRBReach threshold value ± PTOr 0, or the state-of-charge SOC of vanadium cellVRBBeyond normal range of operation, and direct-current grid is in island operation state, then perform step I；
If the output P of vanadium energy storage systemVRBReach threshold value ± PTOr 0, or the state-of-charge SOC of vanadium cellVRBBeyond normal range of operation, and direct-current grid is in the state of being incorporated into the power networks, then perform step J；
I. the two-way DC/DC changer that voltage regulator controllers controls in vanadium energy storage system is switched to idle pulley by double-closed-loop control pattern, and vanadium energy storage system output thereby turns off；Then, the second two-way DC/DC changer that voltage regulator controllers controls in mixed energy storage system is switched to sagging pressure regulation pattern by power blockage pattern, and mixed energy storage system thus returns to sagging pressure regulation pattern, and according to DC bus-bar voltage U nowdcAgain adjust its output；Then, step D is returned；
J. the two-way DC/DC changer that voltage regulator controllers controls in vanadium energy storage system is switched to idle pulley by double-closed-loop control pattern, and vanadium energy storage system output thereby turns off；Then, the two-way DC/AC changer that voltage regulator controllers controls in grid-connected system is switched to sagging pressure regulation pattern by power blockage pattern, and grid-connected system thus returns to sagging pressure regulation pattern, and according to DC bus-bar voltage U nowdcAgain adjust its output；Then, step D is returned.
Compared with traditional direct-current grid voltage-regulating system, a kind of direct-current grid secondary voltage-regulating system of the present invention and control method thereof are based on energy fast charging and discharging, fast response time, the vanadium energy storage system having extended cycle life, and utilize voltage regulator controllers to control vanadium energy storage system and once sagging voltage-regulating system cooperation, the zero steady-state error achieving DC bus-bar voltage regulates (namely when direct-current grid stable operation, DC bus-bar voltage is maintained at its rated value), eliminate the steady-state deviation of DC bus-bar voltage its rated value relatively, thus it is effectively increased load power supply quality and the running efficiency of system of direct-current grid, it is achieved thereby that the economical and efficient of direct-current grid runs.
The present invention efficiently solves the sagging voltage-regulating system of traditional direct-current grid cannot regulate the problem to its rated value by DC bus-bar voltage, it is adaptable to direct-current grid.
Accompanying drawing explanation
Fig. 1 is the structural representation of direct-current grid involved in the present invention.
Fig. 2 is the structural representation of a kind of direct-current grid secondary voltage-regulating system of the present invention.
Fig. 3 is the flow chart of the control method of a kind of direct-current grid secondary voltage-regulating system of the present invention.
Fig. 4 is the working machine drawing of a kind of direct-current grid secondary voltage-regulating system of the present invention.
Fig. 5 is the droop characteristic schematic diagram of mixed energy storage system in the present invention.
Fig. 6 is the droop characteristic schematic diagram of grid-connected system in the present invention.
Fig. 7 is the power control block figure of once sagging voltage-regulating system in the present invention.
Fig. 8 is the double-closed-loop control block diagram of vanadium energy storage system in the present invention.
Fig. 9 is the transition diagram of a pressure regulation process and secondary pressure regulation process in the present invention.
In Fig. 2: PHESS、Pgrid、PVRBRepresent the output of the output of mixed energy storage system, the output of grid-connected system DC side, vanadium energy storage system respectively.
In Fig. 4: UdcrRepresent the rated value of DC bus-bar voltage；UH2And UL2Represent the dividing value up and down of DC bus-bar voltage allowable fluctuation range when direct-current grid is properly functioning respectively；UL1And UH1Represent that once sagging voltage-regulating system starts or exits the voltage threshold of action；A, B, C, D, E, F, G, H, I, J all represent the operating point of direct-current grid.
In Fig. 5: UdcrRepresent the rated value of DC bus-bar voltage；UH2And UL2Represent the dividing value up and down of DC bus-bar voltage allowable fluctuation range when direct-current grid is properly functioning respectively；UL1And UH1Represent that once sagging voltage-regulating system starts or exits the voltage threshold of action；IHESS_refRepresent the output current reference value of mixed energy storage system；IHESS_min、IHESS_maxRepresent that mixed energy storage system allows the limit value of charging, discharge current respectively.
In Fig. 6: UdcrRepresent the rated value of DC bus-bar voltage；UH2And UL2Represent the dividing value up and down of DC bus-bar voltage allowable fluctuation range when direct-current grid is properly functioning respectively；UL1And UH1Represent that once sagging voltage-regulating system starts or exits the voltage threshold of action；Igrid_refRepresent grid-connected system DC side output current reference value；Igrid_min、Igrid_maxRepresent the limit value of grid-connected system DC side two-way flow electric current respectively.
In Fig. 7: Idroop-------_refRepresent once the reference value of sagging voltage-regulating system output electric current；Idroop_realRepresent once the actual value of sagging voltage-regulating system output electric current；When PI switch is connected to A, once sagging voltage-regulating system is in sagging pressure regulation pattern；When PI switch is connected to B, once sagging voltage-regulating system is in power blockage pattern.
In Fig. 8: UdcrRepresent the rated value of DC bus-bar voltage；IVRB_refRepresent the reference value of vanadium cell output electric current；IVRB_realRepresent the actual value of vanadium cell output electric current.
Detailed description of the invention
A kind of direct-current grid secondary voltage-regulating system, including vanadium energy storage system, voltage regulator controllers；
Described vanadium energy storage system includes vanadium cell, two-way DC/DC changer, vanadium cell detector；
Vanadium cell is connected with dc bus by two-way DC/DC changer；Vanadium cell detector is connected with vanadium cell；
Voltage regulator controllers is connected with the second two-way DC/DC changer in the two-way DC/DC changer in dc bus, vanadium cell detector, vanadium energy storage system, mixed energy storage system, the two-way DC/AC changer in grid-connected system respectively.
A kind of control method (the method is based on a kind of direct-current grid secondary voltage-regulating system of the present invention and realizes) of direct-current grid secondary voltage-regulating system, the method is to adopt following steps to realize:
A. voltage regulator controllers selects once sagging voltage-regulating system according to the running status of direct-current grid:
If direct-current grid is in island operation state, then served as once sagging voltage-regulating system by mixed energy storage system, then perform step B；
If direct-current grid is in the state of being incorporated into the power networks, then served as once sagging voltage-regulating system by grid-connected system, then perform step C；
B. the second two-way DC/DC changer that voltage regulator controllers controls in mixed energy storage system switches to sagging pressure regulation pattern, according to DC bus-bar voltage U nowdcA pressure regulation is carried out with droop characteristic；Then, step D is performed；
C. the two-way DC/AC changer that voltage regulator controllers controls in grid-connected system switches to sagging pressure regulation pattern, according to DC bus-bar voltage U nowdcA pressure regulation is carried out with droop characteristic；Then, step D is performed；
D. voltage regulator controllers gathers DC bus-bar voltage Udc, and judge DC bus-bar voltage UdcVariation delta U within the Δ t timedcWhether less than threshold value δ；
If DC bus-bar voltage UdcVariation delta U within the Δ t timedcBeing not less than threshold value δ, then show that the operation of direct-current grid is not up to stable state, now circulation performs step D；
If DC bus-bar voltage UdcVariation delta U within the Δ t timedcLess than threshold value δ, then show that the operation of direct-current grid reaches stable state, now perform step E；
E. voltage regulator controllers detects the state-of-charge SOC of vanadium cell in real time by vanadium cell detectorVRB, and judge the state-of-charge SOC of vanadium cellVRBWhether beyond normal range of operation；
If the state-of-charge SOC of vanadium cellVRBWithout departing from normal range of operation, and direct-current grid is in island operation state, then perform step F；
If the state-of-charge SOC of vanadium cellVRBWithout departing from normal range of operation, and direct-current grid is in the state of being incorporated into the power networks, then perform step G；
If the state-of-charge SOC of vanadium cellVRBBeyond normal range of operation, then circulation performs step E；
F. the second two-way DC/DC changer that voltage regulator controllers controls in mixed energy storage system is switched to power blockage pattern (in Fig. 7, PI switch is switched to B by A) by sagging pressure regulation pattern, and the output of mixed energy storage system is thus locked as currency；Then, the two-way DC/DC changer that voltage regulator controllers controls in vanadium energy storage system is switched to double-closed-loop control pattern by idle pulley, and vanadium energy storage system is thus by DC bus-bar voltage UdcRegulate to its rated value Udcr, thus realizing DC bus-bar voltage UdcZero error Secondary Control；Then, step H is performed；
G. the two-way DC/AC changer that voltage regulator controllers controls in grid-connected system is switched to power blockage pattern (in Fig. 7, PI switch is switched to B by A) by sagging pressure regulation pattern, and the output of grid-connected system is thus locked as currency；Then, the two-way DC/DC changer that voltage regulator controllers controls in vanadium energy storage system is switched to double-closed-loop control pattern by idle pulley, and vanadium energy storage system is thus by DC bus-bar voltage UdcRegulate to its rated value Udcr, thus realizing DC bus-bar voltage UdcZero error Secondary Control；Then, step H is performed；
H. voltage regulator controllers detects the output P of vanadium energy storage system in real time by vanadium cell detectorVRB, and judge the output P of vanadium energy storage systemVRBWhether reach threshold value ± PTOr 0；Meanwhile, voltage regulator controllers detects the state-of-charge SOC of vanadium cell in real time by vanadium cell detectorVRB, and judge the state-of-charge SOC of vanadium cellVRBWhether beyond normal range of operation；
If the output P of vanadium energy storage systemVRBNot up to threshold value ± PTOr 0, and the state-of-charge SOC of vanadium cellVRBWithout departing from normal range of operation, then circulation performs step H；
If the output P of vanadium energy storage systemVRBReach threshold value ± PTOr 0, or the state-of-charge SOC of vanadium cellVRBBeyond normal range of operation, and direct-current grid is in island operation state, then perform step I；
If the output P of vanadium energy storage systemVRBReach threshold value ± PTOr 0, or the state-of-charge SOC of vanadium cellVRBBeyond normal range of operation, and direct-current grid is in the state of being incorporated into the power networks, then perform step J；
I. the two-way DC/DC changer that voltage regulator controllers controls in vanadium energy storage system is switched to idle pulley by double-closed-loop control pattern, and vanadium energy storage system output thereby turns off；Then, the second two-way DC/DC changer that voltage regulator controllers controls in mixed energy storage system is switched to sagging pressure regulation pattern (in Fig. 7 by power blockage pattern, PI switch is switched to A by B), mixed energy storage system thus returns to sagging pressure regulation pattern, and according to DC bus-bar voltage U nowdcAgain adjust its output；Then, step D is returned；
J. the two-way DC/DC changer that voltage regulator controllers controls in vanadium energy storage system is switched to idle pulley by double-closed-loop control pattern, and vanadium energy storage system output thereby turns off；Then, the two-way DC/AC changer that voltage regulator controllers controls in grid-connected system is switched to sagging pressure regulation pattern (in Fig. 7 by power blockage pattern, PI switch is switched to A by B), grid-connected system thus returns to sagging pressure regulation pattern, and according to DC bus-bar voltage U nowdcAgain adjust its output；Then, step D is returned.
In described step F, G, the once realization of the power blockage pattern of sagging voltage-regulating system, is by its power control loop saves output current reference value I in (see figure 7)droop_refWith output current actual value Idroop_realBetween electric current residual quantity signal IΔArtificial zero setting completes, and output electric current is constant to make it keep currently by an electric current loop, thus realizing the locking of its output.
When being embodied as, in described step H, the output threshold value P of vanadium energy storage systemTBeing based on following methods to determine: when DC micro power grid system load abruptly increase, under the adjustment effect of once sagging voltage-regulating system, DC bus-bar voltage is stable at Udc=UL2Time, if vanadium energy storage system secondary pressure regulation is by output P0DC bus-bar voltage is regulated to Udc=Udcr, then P is takenT=P0。
Claims (3)
1. a direct-current grid secondary voltage-regulating system, it is characterised in that: include vanadium energy storage system, voltage regulator controllers；
Described vanadium energy storage system includes vanadium cell, two-way DC/DC changer, vanadium cell detector；
Vanadium cell is connected with dc bus by two-way DC/DC changer；Vanadium cell detector is connected with vanadium cell；
Voltage regulator controllers is connected with the second two-way DC/DC changer in the two-way DC/DC changer in dc bus, vanadium cell detector, vanadium energy storage system, mixed energy storage system, the two-way DC/AC changer in grid-connected system respectively.
2. a control method for direct-current grid secondary voltage-regulating system, the method is based on a kind of direct-current grid secondary voltage-regulating system as claimed in claim 1 and realizes, it is characterised in that: the method is to adopt following steps to realize:
A. voltage regulator controllers selects once sagging voltage-regulating system according to the running status of direct-current grid:
If direct-current grid is in island operation state, then served as once sagging voltage-regulating system by mixed energy storage system, then perform step B；
If direct-current grid is in the state of being incorporated into the power networks, then served as once sagging voltage-regulating system by grid-connected system, then perform step C；
B. the second two-way DC/DC changer that voltage regulator controllers controls in mixed energy storage system switches to sagging pressure regulation pattern, according to DC bus-bar voltage U nowdcA pressure regulation is carried out with droop characteristic；Then, step D is performed；
C. the two-way DC/AC changer that voltage regulator controllers controls in grid-connected system switches to sagging pressure regulation pattern, according to DC bus-bar voltage U nowdcA pressure regulation is carried out with droop characteristic；Then, step D is performed；
D. voltage regulator controllers gathers DC bus-bar voltage Udc, and judge DC bus-bar voltage UdcVariation delta U within the Δ t timedcWhether less than threshold value δ；
If DC bus-bar voltage UdcVariation delta U within the Δ t timedcBeing not less than threshold value δ, then show that the operation of direct-current grid is not up to stable state, now circulation performs step D；
If DC bus-bar voltage UdcVariation delta U within the Δ t timedcLess than threshold value δ, then show that the operation of direct-current grid reaches stable state, now perform step E；
E. voltage regulator controllers detects the state-of-charge SOC of vanadium cell in real time by vanadium cell detectorVRB, and judge the state-of-charge SOC of vanadium cellVRBWhether beyond normal range of operation；
If the state-of-charge SOC of vanadium cellVRBWithout departing from normal range of operation, and direct-current grid is in island operation state, then perform step F；
If the state-of-charge SOC of vanadium cellVRBWithout departing from normal range of operation, and direct-current grid is in the state of being incorporated into the power networks, then perform step G；
If the state-of-charge SOC of vanadium cellVRBBeyond normal range of operation, then circulation performs step E；
F. the second two-way DC/DC changer that voltage regulator controllers controls in mixed energy storage system is switched to power blockage pattern by sagging pressure regulation pattern, and the output of mixed energy storage system is thus locked as currency；Then, the two-way DC/DC changer that voltage regulator controllers controls in vanadium energy storage system is switched to double-closed-loop control pattern by idle pulley, and vanadium energy storage system is thus by DC bus-bar voltage UdcRegulate to its rated value Udcr, thus realizing DC bus-bar voltage UdcZero error Secondary Control；Then, step H is performed；
G. the two-way DC/AC changer that voltage regulator controllers controls in grid-connected system is switched to power blockage pattern by sagging pressure regulation pattern, and the output of grid-connected system is thus locked as currency；Then, the two-way DC/DC changer that voltage regulator controllers controls in vanadium energy storage system is switched to double-closed-loop control pattern by idle pulley, and vanadium energy storage system is thus by DC bus-bar voltage UdcRegulate to its rated value Udcr, thus realizing DC bus-bar voltage UdcZero error Secondary Control；Then, step H is performed；
H. voltage regulator controllers detects the output P of vanadium energy storage system in real time by vanadium cell detectorVRB, and judge the output P of vanadium energy storage systemVRBWhether reach threshold value ± PTOr 0；Meanwhile, voltage regulator controllers detects the state-of-charge SOC of vanadium cell in real time by vanadium cell detectorVRB, and judge the state-of-charge SOC of vanadium cellVRBWhether beyond normal range of operation；
If the output P of vanadium energy storage systemVRBNot up to threshold value ± PTOr 0, and the state-of-charge SOC of vanadium cellVRBWithout departing from normal range of operation, then circulation performs step H；
If the output P of vanadium energy storage systemVRBReach threshold value ± PTOr 0, or the state-of-charge SOC of vanadium cellVRBBeyond normal range of operation, and direct-current grid is in island operation state, then perform step I；
If the output P of vanadium energy storage systemVRBReach threshold value ± PTOr 0, or the state-of-charge SOC of vanadium cellVRBBeyond normal range of operation, and direct-current grid is in the state of being incorporated into the power networks, then perform step J；
I. the two-way DC/DC changer that voltage regulator controllers controls in vanadium energy storage system is switched to idle pulley by double-closed-loop control pattern, and vanadium energy storage system output thereby turns off；Then, the second two-way DC/DC changer that voltage regulator controllers controls in mixed energy storage system is switched to sagging pressure regulation pattern by power blockage pattern, and mixed energy storage system thus returns to sagging pressure regulation pattern, and according to DC bus-bar voltage U nowdcAgain adjust its output；Then, step D is returned；
J. the two-way DC/DC changer that voltage regulator controllers controls in vanadium energy storage system is switched to idle pulley by double-closed-loop control pattern, and vanadium energy storage system output thereby turns off；Then, the two-way DC/AC changer that voltage regulator controllers controls in grid-connected system is switched to sagging pressure regulation pattern by power blockage pattern, and grid-connected system thus returns to sagging pressure regulation pattern, and according to DC bus-bar voltage U nowdcAgain adjust its output；Then, step D is returned.
3. the control method of a kind of direct-current grid secondary voltage-regulating system according to claim 2, it is characterized in that: in described step F, G, the once realization of the power blockage pattern of sagging voltage-regulating system, is by output current reference value I in being saved by its power control loopdroop_refWith output current actual value Idroop_realBetween electric current residual quantity signal IΔArtificial zero setting completes, and output electric current is constant to make it keep currently by an electric current loop, thus realizing the locking of its output.
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| CN106849156A (en) * | 2017-01-06 | 2017-06-13 | 许继集团有限公司 | A kind of direct-current grid and off-network transfer bus voltage control smoothing method and system |
| CN111697678A (en) * | 2020-07-17 | 2020-09-22 | 东莞理工学院 | Observer-based zero steady-state error control method for hybrid energy storage system |
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| CN111697678A (en) * | 2020-07-17 | 2020-09-22 | 东莞理工学院 | Observer-based zero steady-state error control method for hybrid energy storage system |
| CN111697678B (en) * | 2020-07-17 | 2023-04-07 | 东莞理工学院 | Hybrid energy storage system zero steady state error control method based on observer |
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