CN104779612B - The micro-grid system control method that many PCC point based on PCS energy storage device controls - Google Patents
The micro-grid system control method that many PCC point based on PCS energy storage device controls Download PDFInfo
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Abstract
The present invention relates to the micro-grid system control method that a kind of many PCC point based on PCS energy storage device controls, this control method setting the first PCC switching point and the 2nd PCC switching point at micro-grid system with bulk power system junction point, 3rd PCC switching point is arranged on the inside common bus of micro-grid system, by the control realization micro-grid system control to each PCC switching point, it is connected with multiple pc S energy storage device, this control method specifically includes on described internal common bus：A) electrical breakdown rate-determining steps；B) power system restoration power supply control step.Compared with prior art, the present invention setting the first PCC switching point and the 2nd PCC switching point at micro-grid system with bulk power system junction point, 3rd PCC switching point is arranged on the inside common bus of micro-grid system, control by 3 PCC switching points, realize the control strategy to PCS energy storage device for the micro-grid system, have the advantages that control is flexible.
Description
Technical field
The present invention relates to electric and electronic technical field, especially relate to a kind of point of many PCC based on PCS energy storage device and control
Micro-grid system control method.
Background technology
At present, in large-scale micro-grid system (as island microgrid system etc.) application, the volume of separate unit PCS energy storage device
Constant volume cannot meet so huge generating and electricity system, for ensureing the stability that large-scale micro-grid system runs, fills
PCS (the Power Convert System) coordinative role to generating end and load end for the energy storage device is waved in distribution, typically using many
Platform PCS energy storage device cooperation, to make up the problem that rated capacity cannot meet.
It is soft that Chinese patent application CN 104218612A discloses a kind of micro-capacitance sensor based on overall-in-one control schema at points of common connection
Property grid-connected control method, configuration energy-storage system and SSTS at PCC, can be adopted with power distribution network points of common connection place using micro-capacitance sensor
The complete micro-capacitance sensor collecting and power distribution network information about power, coordinate the energy storage of this place configuration, temporarily drop generation in distribution network voltage
When, send idle to power distribution network, consumes unnecessary idle during voltage swell, alleviates Voltage Instability degree；Cooperation solid converting switch,
Improve micro-capacitance sensor off-network switch speed and precision.But being gradually increased with power system capacity, single PCC point (Point of
Common Coupling, points of common connection) control the mode that whole system is connected with electrical network too single, cause internal system
Control strategy cannot flexibly realize P/Q (being incorporated into the power networks), V/F (islet operation) to multiple pc S energy storage device and control mould
The use of formula.
So needing to design a kind of micro-capacitance sensor network architecture of the multiple PCC points based on PCS energy storage device, to meet great Rong
The flexible use of amount micro-grid system control strategy.
Content of the invention
The purpose of the present invention is exactly to overcome the defect of above-mentioned prior art presence to provide a kind of control flexibly and easily
The micro-grid system control method that controls of many PCC point based on PCS energy storage device.
The purpose of the present invention can be achieved through the following technical solutions：
The micro-grid system control method that a kind of many PCC point based on PCS energy storage device controls, this control method is in micro- electricity
At net system and bulk power system junction point, a PCC switching point and the 2nd PCC switching point are set, in the inside of micro-grid system
3rd PCC switching point is arranged on common bus, by the control realization micro-grid system control to each PCC switching point, described interior
Multiple pc S energy storage device is connected with portion's common bus, this control method specifically includes：
A) electrical breakdown rate-determining steps；
B) power system restoration power supply control step.
Described electrical breakdown rate-determining steps are specially：
A01) detect whether that presence plan isolated island instructs, if so, then enter plan isolated island control strategy, execution step
A02), if it is not, then entering unplanned isolated island control strategy；
A02) judge whether the 3rd PCC switching point closes, if so, then execution step a03), if it is not, then micro-grid system divides
Other two micro-capacitance sensor subsystems, execution step a06)；
A03) judge whether PCS energy storage device is in unit V/F pattern, if so, then execution step a04), if it is not, then holding
Row step a05)；
A04) one PCS energy storage device of labelling enters V/F pattern, disconnects the 2nd PCC switching point and PCC switch successively
Point, sends to the PCS energy storage device of labelling and turns V/F instruction；
A05) disconnect the 2nd PCC switching point and a PCC switching point successively, send to all PCS energy storage devices simultaneously and turn
V/F instructs；
A06) judge whether PCS energy storage device is in unit V/F pattern, if so, then execution step a07), if it is not, then holding
Row step a08)；
A07) a PCS energy storage device of two micro-capacitance sensor subsystems of labelling enters V/F pattern respectively, simultaneously switches off first
PCC switching point and the 2nd PCC switching point, send to the PCS energy storage device of two station symbol notes and turn V/F instruction；
A08) simultaneously switch off a PCC switching point and the 2nd PCC switching point, turn V/F to the transmission of all PCS energy storage devices and refer to
Order.
In described unplanned isolated island control strategy, the 2nd PCC switching point and a PCC switching point are and simultaneously switch off.
Described power system restoration power supply control step is specially：
B01) judge whether the 3rd PCC switching point closes, if so, then execution step b02), if it is not, then micro-grid system divides
Other two micro-capacitance sensor subsystems, execution step b06)；
B02) judge whether PCS energy storage device is in unit V/F pattern, if so, then to the PCS being in unit V/F pattern
Energy storage device carries out same period regulation, execution step b03), if it is not, then same period regulation is carried out to all PCS energy storage devices, execute step
Rapid b03)；
B03) judge whether a PCC switching point grid side is all consistent with the voltage magnitude of microgrid side, phase angle, if so, then
Stop same period regulation, execution step b05), if it is not, then execution step b04)；
B04) judge whether regulating time is more than given threshold, if so, then the same period is adjusted unsuccessfully, if it is not, then readjusting,
Return to step b03)；
B05) close a PCC switching point, and send, to PCS energy storage device, the instruction turning P/Q pattern, judge all PCS
Whether energy storage device normally runs, and if so, then closes a PCC switching point, if it is not, then return to step b05)；
B06) judge whether PCS energy storage device is in unit V/F pattern, if so, then respectively to two micro-capacitance sensor subsystems
In be in the PCS energy storage device of unit V/F pattern and carry out same period regulation, execution step b07), if it is not, then to all PCS energy storage
Device carries out same period regulation, execution step b07)；
B07) judge whether a PCC switching point grid side is all consistent with the voltage magnitude of two microgrid sides, phase angle respectively,
If so, same period regulation, execution step b09 are then stopped), if it is not, then execution step b08)；
B08) judge whether regulating time is more than given threshold, if so, then the same period is adjusted unsuccessfully, if it is not, then readjusting,
Return to step b07)；
B09) it is closed at a PCC switching point and the 2nd PCC switching point, and turn P/Q pattern to the transmission of PCS energy storage device
Instruction, judge whether all PCS energy storage devices normally run, if so, then close the 3rd PCC switching point, if it is not, then return step
Rapid b09).
Described PCS energy storage device is carried out the same period adjust be specially：
To the PCS energy storage device being in V/F pattern send the voltage magnitude of a PCC switching point grid side, frequency and
Same period regulating command.
Described PCS energy storage device is provided with least 4.
Compared with prior art, the present invention is directed to many PCC point design present in micro-grid system, proposes one kind and is directed to
PCS energy storage device the new type of control method of off-network switching, have advantages below：
(1) present invention arranges a PCC switching point at micro-grid system with bulk power system junction point and the 2nd PCC opens
Guan Dian, arranges the 3rd PCC switching point on the inside common bus of micro-grid system, by the control of 3 PCC switching points, real
The existing control strategy to PCS energy storage device for the micro-grid system, controls flexible；
(2) present invention can conveniently realize electrical breakdown control and power system restoration power supply control.
Brief description
Fig. 1 is the network architecture schematic diagram of micro-grid system in the present invention；
Fig. 2 is the schematic flow sheet of electrical breakdown rate-determining steps in the present invention；
Fig. 3 is the schematic flow sheet of power system restoration power supply control step in the present invention.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention be not limited to
Following embodiments.
The present embodiment provides the micro-grid system control method that a kind of many PCC point based on PCS energy storage device controls, and such as schemes
Shown in 1, this control method setting the first PCC switching point 1 (PCC1) and the at micro-grid system and bulk power system junction point
Two PCC switching points 2 (PCC2), arrange the 3rd PCC switching point 3 (PCC3) on the inside common bus of micro-grid system, pass through
The control realization micro-grid system of each PCC switching point is controlled.PCS energy storage device can be arranged as required to multiple stage, the present embodiment
In, internal common bus is connected with 4 PCS energy storage devices 4.
The control method of the present embodiment specifically includes：
A) electrical breakdown rate-determining steps；
B) power system restoration power supply control step.
When system is normally run, 3 PCC switching points are in closure state, as shown in Fig. 2 electrical breakdown rate-determining steps tool
Body is：
A01) detect whether that presence plan isolated island instructs, if so, then enter plan isolated island control strategy, execution step
A02), if it is not, then entering unplanned isolated island control strategy；
A02) judge whether the 3rd PCC switching point closes, if so, then micro-grid system is a big microgrid, execution step
A03), if it is not, then micro-grid system respectively two micro-capacitance sensor subsystems, now in detection PCS energy storage device list V/F or many V/F
Simultaneously need to giving respectively to instruct, to ensure the continued power of 2 sub- micro-grid systems, execution step to 2 micro-capacitance sensor subsystems
a06)；
A03) judge whether PCS energy storage device is in unit V/F pattern, if so, then execution step a04), if it is not, then holding
Row step a05)；
A04) one PCS energy storage device of labelling enters V/F pattern, disconnects the 2nd PCC switching point and PCC switch successively
Point, sends to the PCS energy storage device of labelling and turns V/F instruction；
A05) disconnect the 2nd PCC switching point and a PCC switching point successively, send to all PCS energy storage devices simultaneously and turn
V/F instructs；
A06) judge whether PCS energy storage device is in unit V/F pattern, if so, then execution step a07), if it is not, then holding
Row step a08)；
A07) a PCS energy storage device of two micro-capacitance sensor subsystems of labelling enters V/F pattern respectively, simultaneously switches off first
PCC switching point and the 2nd PCC switching point, send to the PCS energy storage device of two station symbol notes and turn V/F instruction；
A08) simultaneously switch off a PCC switching point and the 2nd PCC switching point, turn V/F to the transmission of all PCS energy storage devices and refer to
Order.
Unplanned isolated island control strategy is with the difference of plan isolated island, a PCC switching point, the 2nd PCC switching point
Disjunction mode is different, plans isolated island the PCC switching point and the 2nd PCC switching point when the 3rd PCC switching point closes, for ensureing
PCS energy storage device V/F patten transformation is stable, need to have successively, can not disjunction simultaneously, and unplanned isolated island then can disjunction first simultaneously
PCC switching point and the 2nd PCC switching point.
During micro-grid system isolated power grid, if now power system restoration is powered, issue simultaneous interconnecting instruction.As shown in figure 3,
Power system restoration power supply control step is specially：
B01) judge whether the 3rd PCC switching point closes, if so, then execution step b02), if it is not, then micro-grid system divides
Other two micro-capacitance sensor subsystems, need to carry out corresponding command operating, execution step b06 to two micro-capacitance sensor subsystems respectively)；
B02) judge whether PCS energy storage device is in unit V/F pattern, if so, then to the PCS being in unit V/F pattern
Energy storage device carries out same period regulation, execution step b03), if it is not, then same period regulation is carried out to all PCS energy storage devices, execute step
Rapid b03)；
PCS energy storage device is carried out with same period regulation be specially：
To the PCS energy storage device being in V/F pattern send the voltage magnitude of a PCC switching point grid side, frequency and
Same period regulating command.
B03) judge whether a PCC switching point grid side is all consistent with the voltage magnitude of microgrid side, phase angle, if so, then
Stop same period regulation, execution step b05), if it is not, then execution step b04)；
B04) judge whether regulating time is more than given threshold, if so, then the same period is adjusted unsuccessfully, if it is not, then readjusting,
Return to step b03)；
B05) close a PCC switching point, and send, to PCS energy storage device, the instruction turning P/Q pattern, judge all PCS
Whether energy storage device normally runs, and if so, then closes a PCC switching point, completes simultaneous interconnecting, if it is not, then return to step
b05)；
B06) judge whether PCS energy storage device is in unit V/F pattern, if so, then respectively to two micro-capacitance sensor subsystems
In be in the PCS energy storage device of unit V/F pattern and carry out same period regulation, execution step b07), if it is not, then to all PCS energy storage
Device carries out same period regulation, execution step b07)；
B07) judge whether a PCC switching point grid side is all consistent with the voltage magnitude of two microgrid sides, phase angle respectively,
If so, same period regulation, execution step b09 are then stopped), if it is not, then execution step b08)；
B08) judge whether regulating time is more than given threshold, if so, then the same period is adjusted unsuccessfully, if it is not, then readjusting,
Return to step b07)；
B09) it is closed at a PCC switching point and the 2nd PCC switching point, and turn P/Q pattern to the transmission of PCS energy storage device
Instruction, judge whether all PCS energy storage devices normally run, if so, then close the 3rd PCC switching point, complete simultaneous interconnecting,
If it is not, then return to step b09).
Claims (5)
1. a kind of many PCC point based on PCS energy storage device controls micro-grid system control method is it is characterised in that this control
Method setting the first PCC switching point and the 2nd PCC switching point at micro-grid system with bulk power system junction point, in micro-capacitance sensor
On the inside common bus of system, the 3rd PCC switching point is set, by the control realization micro-grid system control to each PCC switching point
System, described internal common bus is connected with multiple pc S energy storage device, this control method specifically includes：
A) electrical breakdown rate-determining steps；
B) power system restoration power supply control step；
Described electrical breakdown rate-determining steps are specially：
A01) detect whether that presence plan isolated island instructs, if so, then enter plan isolated island control strategy, execution step a02), if
No, then enter unplanned isolated island control strategy；
A02) judge whether the 3rd PCC switching point closes, if so, then execution step a03), if it is not, then micro-grid system is divided into two
Individual micro-capacitance sensor subsystem, execution step a06)；
A03) judge whether PCS energy storage device is in unit V/F pattern, if so, then execution step a04), if it is not, then executing step
Rapid a05)；
A04) one PCS energy storage device of labelling enters V/F pattern, disconnects the 2nd PCC switching point and a PCC switching point successively,
Send to the PCS energy storage device of labelling and turn V/F instruction；
A05) disconnect the 2nd PCC switching point and a PCC switching point successively, turn V/F to all PCS energy storage devices transmissions simultaneously and refer to
Order；
A06) judge whether PCS energy storage device is in unit V/F pattern, if so, then execution step a07), if it is not, then executing step
Rapid a08)；
A07) a PCS energy storage device of two micro-capacitance sensor subsystems of labelling enters V/F pattern respectively, simultaneously switches off a PCC
Switching point and the 2nd PCC switching point, send to the PCS energy storage device of two station symbol notes and turn V/F instruction；
A08) simultaneously switch off a PCC switching point and the 2nd PCC switching point, send to all PCS energy storage devices and turn V/F instruction.
2. the micro-grid system control method that the many PCC point based on PCS energy storage device according to claim 1 controls, its
It is characterised by, in described unplanned isolated island control strategy, the 2nd PCC switching point and a PCC switching point are and simultaneously switch off.
3. the micro-grid system control method that the many PCC point based on PCS energy storage device according to claim 1 controls, its
It is characterised by, described power system restoration power supply control step is specially：
B01) judge whether the 3rd PCC switching point closes, if so, then execution step b02), if it is not, then micro-grid system is divided into two
Individual micro-capacitance sensor subsystem, execution step b06)；
B02) judge whether PCS energy storage device is in unit V/F pattern, if so, then to the PCS energy storage being in unit V/F pattern
Device carries out same period regulation, execution step b03), if it is not, then same period regulation, execution step are carried out to all PCS energy storage devices
b03)；
B03) judge that whether a PCC switching point grid side is all consistent with the voltage magnitude of microgrid side, phase angle, if so, then stops
The same period is adjusted, execution step b05), if it is not, then execution step b04)；
B04) judging whether regulating time is more than given threshold, if so, then the same period is adjusted unsuccessfully, if it is not, then readjusting, returning
Step b03)；
B05) close a PCC switching point, and send, to PCS energy storage device, the instruction turning P/Q pattern, judge all PCS energy storage
Whether device normally runs, and if so, then closes a PCC switching point, if it is not, then return to step b05)；
B06) judge whether PCS energy storage device is in unit V/F pattern, if so, then locate in two micro-capacitance sensor subsystems respectively
PCS energy storage device in unit V/F pattern carries out same period regulation, execution step b07), if it is not, then to all PCS energy storage devices
Carry out same period regulation, execution step b07)；
B07) judge whether a PCC switching point grid side is all consistent with the voltage magnitude of two microgrid sides, phase angle respectively, if
It is then to stop same period regulation, execution step b09), if it is not, then execution step b08)；
B08) judging whether regulating time is more than given threshold, if so, then the same period is adjusted unsuccessfully, if it is not, then readjusting, returning
Step b07)；
B09) it is closed at a PCC switching point and the 2nd PCC switching point, and send the finger turning P/Q pattern to PCS energy storage device
Order, judges whether all PCS energy storage devices normally run, and if so, then closes the 3rd PCC switching point, if it is not, then return to step
b09).
4. the micro-grid system control method that the many PCC point based on PCS energy storage device according to claim 1 controls, its
Be characterised by, described PCS energy storage device is carried out the same period adjust be specially：
Send voltage magnitude, frequency and the same period of a PCC switching point grid side to the PCS energy storage device being in V/F pattern
Regulating command.
5. the micro-grid system controlling party being controlled according to the arbitrary described many PCC point based on PCS energy storage device of claim 1-4
Method is it is characterised in that described PCS energy storage device is provided with least 4.
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| CN109066785B (en) * | 2018-08-23 | 2022-06-07 | 上海电气分布式能源科技有限公司 | Micro-grid real-time control method and micro-grid |
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| CN103560535B (en) * | 2013-11-20 | 2015-04-22 | 北京四方继保自动化股份有限公司 | Micro-grid operation mode seamless switching method based on energy storage current transformer |
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