CN107634545B - A kind of alternating current generator sets in parallel operation power distribution method of dissymmetrical structure - Google Patents
A kind of alternating current generator sets in parallel operation power distribution method of dissymmetrical structure Download PDFInfo
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Abstract
The present invention provides a kind of alternating current generator sets in parallel operation power distribution method of dissymmetrical structure, every alternating current generating sets are equipped with power distribution controller；All alternating current generating sets are identified as host and slave by power distribution controller；The power distribution controller control host of host is run under rated frequency and voltage rating；The power distribution controller control slave of slave is run in the case where active power distributes adjustment target value and reactive power distribution adjustment target value.The distribution method proof load end voltage, frequency can remain specified, change without the variation because of bearing power；Active power, the reactive power for guaranteeing that each alternating current generating sets undertake simultaneously can be allocated according to proper proportion, without biggish difference.
Description
Technical field
The present invention relates to alternating current generator field, the alternating current generator sets in parallel operation function of especially a kind of dissymmetrical structure
Rate distribution method.
Background technique
It is reliable to the power supply of alternating current generating sets as power requirement of the electrical equipment to alternating current generating sets is increasing
Property requires higher and higher, while the technology of alternating current generating sets is also more and more mature, also more and more selection exchanges in market
Generating set parallel connection come increase power and provide power supply reliability.In this case, how reasonable during parallel running
Carry out power distribution, especially carry out reasonable power distribution in asymmetric mechanism, guarantee each alternating current generating sets work
Make to avoid making alternating current generating sets phenomena such as leading to inverse function because of power distribution unevenness under the highest operating condition of reasonable reliable efficiency
At damage.
Existing power distribution method only considers the alternating current generator sets in parallel operation of symmetrical structure, does not consider asymmetrical junction
The alternating current generator sets in parallel operation of structure.
Summary of the invention
The object of the present invention is to provide a kind of alternating current generator sets in parallel operation power distribution method of dissymmetrical structure, solutions
Never the alternating current generator sets in parallel operation of symmetrical structure when supply voltage, frequency be unstable and reactive power cannot divide equally
Problem.
Alternating current generating sets: refer to the generating equipment that mechanical energy or other renewable energy can be transformed into AC energy；
Dissymmetrical structure: refer to the rated power of the alternating current generating sets of more parallel runnings or distance away from load not phase
Together；
Specifically, the present invention provides a kind of alternating current generator sets in parallel operation power distribution method of dissymmetrical structure,
Every alternating current generating sets are equipped with power distribution controller；All alternating current generating sets are identified as host by power distribution controller
And slave；The power distribution controller control host of host is run under rated frequency and voltage rating；The power distribution of slave
Controller controls slave and runs in the case where active power distributes adjustment target value and reactive power distribution adjustment target value.
While voltage, frequency can remain specified at proof load end, guarantee what each alternating current generating sets undertook
Active power, reactive power can be allocated according to proper proportion, without biggish difference.
Further, host be with load the shortest alternating current generating sets of connection cables, other alternating current generating sets be from
Machine.
Cable between host and load is most short, then electric energy loss is minimum, can guarantee that load voltage, frequency more approach surely
It is fixed.
Further, the process of the identification of power distribution controller host and slave are as follows:
To the cable distance of all power distribution controller input AC generating sets and load, power distribution controller is logical
The distance that installed generating set and the distance load of other generating sets are compared in communication is crossed, it will be shortest with load connection cables
Alternating current generating sets are set to host, other alternating current generating sets are set to slave.
Institute's power divider all compares, and communicates with each other between power divider, and the information sharing for being prevents from only having
One power divider carries out the case where control will appear error.
Further, the power distribution controller control host of host is run under rated frequency and voltage rating, specifically
Are as follows:
The power distribution controller acquisition real-time voltage of host of host, real-time frequency, by the voltage rating Vref of host,
Rated frequency Fref respectively with host real-time voltage Vk, real-time frequency FkIt makes the difference, obtains rated frequency Fref and host real-time frequency
FkDifference DELTA Fk, voltage rating Vref and host real-time voltage VkDifference DELTA Vk, controlled and led using discrete PID control method
The governor output of machine is host target frequency UGOVk, the pressure regulator output for controlling host is host target voltage UAVRk。
This method calculates simplicity, and the memory for saving power distribution controller increases adjusting meanwhile, it is capable to adjust in real time
Accuracy.
Further, host object frequency UGOVkAre as follows:
Wherein: KFpThe scale parameter of host governor is controlled for host power distribution controller；KFiFor host power distribution
The integral parameter of controller control host governor；KFdThe differential ginseng of host governor is controlled for host power distribution controller
Number Δ FiThe difference on the frequency of host when being controlled for i-th；ΔFk-1The difference on the frequency of host when for -1 secondary control of kth.
When host object frequency is stable operation, frequency that host should reach.
Further, host object voltage UAVRkAre as follows:
Wherein, KVpThe scale parameter of host pressure regulator is controlled for host power distribution controller；KViFor host power distribution
The integral parameter of controller control host pressure regulator；KVdThe differential ginseng of host pressure regulator is controlled for host power distribution controller
Number；ΔViThe voltage difference of host when being controlled for i-th；ΔVk-1The voltage difference of host when for -1 secondary control of kth.
When host object voltage is stable operation, voltage that host should reach.
Further, the active power distribution adjustment target value Px of slave are as follows:
Px=PF* (RPx/ (RP0+RP1+ ...+RPn))
The reactive power distribution adjustment target value Qx of the slave are as follows:
Qx=QF* (RQx/ (RQ0+RQ1+ ...+RQn))
Wherein: the rated active power of generating set G0 ... Gn is respectively RP0 ... RPn, rated reactive power difference
For RQ0 ... RQn；PF is the real-time total active power for loading F, QF is the reactive power power for loading F.
The diligent power and reactive power of slave reach target value, as stable operation value, then whole system operation is flat
Surely, which is proportional assignment, can guarantee when operation do not have deviation between each equipment.
Further, the power distribution controller control slave of slave distributes adjustment target value and idle function in active power
It is run under rate distribution adjustment target value, specifically:
The power distribution controller of slave is by target active power, target reactive power and the real-time active power of slave, reality
When reactive power make the difference, target active-power P x and the real-time active-power P of slavekDifference DELTA Pk, target reactive power Q x with from
Machine reactive power power QkDifference DELTA Qk；Use the governor output valve of discrete PID control method control slave for slave target
Active-power P GOVk, the pressure regulator output valve for controlling slave is slave target reactive power PAVRk。
The power distribution controller control of slave controls slave, so that each slave is transported under ratio target power
Row, increases the operation stability of whole system.
Further, slave target active-power P GOVkAre as follows:
Wherein: KPpThe scale parameter of slave governor is controlled for slave power distribution controller；KPiFor slave power distribution
The integral parameter of controller control slave governor；KPdThe differential ginseng of slave governor is controlled for slave power distribution controller
Number；ΔPiThe active power of slave is poor when controlling for i-th；ΔPk-1The active power of slave is poor when -1 secondary control of kth；.
When slave target active power is stable operation, active power that slave should reach.
Further, slave target reactive power PAVRkAre as follows:
Wherein, KQpThe scale parameter of slave pressure regulator is controlled for slave power distribution controller；KQiFor slave power distribution
The integral parameter of controller control slave pressure regulator；KQdThe differential ginseng of slave pressure regulator is controlled for slave power distribution controller
Number；ΔQiThe reactive power of slave is poor when controlling for i-th；ΔQk-1The reactive power of slave is poor when -1 secondary control of kth.
When slave target reactive power is stable operation, reactive power that slave should reach.
Technical solution of the present invention bring beneficial effect
1. proof load end voltage, frequency can remain specified, change without the variation because of bearing power；
2. the active power, the reactive power that guarantee that each alternating current generating sets undertake can be allocated according to proper proportion,
Without biggish difference.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not to be construed as limiting the invention, in entire attached drawing
In, identical reference symbol indicates identical component.
Fig. 1 is alternating current generating sets parallel-connection structure schematic diagram of the invention；
Fig. 2 is the power distribution control process figure of host of the invention；
Fig. 3 is the power distribution control process figure of slave of the invention.
Specific embodiment
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
The present invention provides a kind of alternating current generator sets in parallel operation power distribution methods of dissymmetrical structure, such as Fig. 1 institute
Show, alternating current generating sets G0, G1, G2 ... Gn, load F, every alternating current generating sets are equipped with power distribution controller, respectively
For E0, E1, E2 ... En, wherein it is connected between E0, E1, E2 ... En by communication bus.
It determines host and slave, is specially host with the load shortest alternating current generating sets of connection cables, other exchanges
Generating set is slave.When operation, artificially to all power distribution controller input AC generating sets and the cable of load away from
From power distribution controller compares the distance of installed generating set and the distance load of other generating sets by communication, will
It is set to host with the load shortest alternating current generating sets of connection cables, other alternating current generating sets are set to slave, automatic distinguishing master
Machine and slave, in fig. 1, G0 are host, and G1 ... Gn is slave, and E0 is the power distribution controller of host, E1 ... En
For the power distribution controller of slave.
During parallel running, the power distribution controller E0 of host controls the voltage of host, frequency stabilization specified
Voltage, rated frequency, detailed process are as follows:
The power distribution controller E0 of voltage rating, the rated frequency of known alternating current generator sets in parallel operation, host is real
When acquire host real-time voltage Vk, real-time frequency Fk, active power, reactive power, by voltage rating Vref, rated frequency
Fref respectively with host real-time voltage Vk, real-time frequency FkIt makes the difference, rated frequency Fref and host are real-time when obtaining kth secondary control
Frequency FkDifference DELTA Fk, voltage rating Vref and host real-time voltage VkDifference DELTA Vk.Control uses discrete PID control.Such as
Fig. 2.The governor output of the power distribution controller E0 control alternating current generating sets G0 of host is host target frequency UGOVk,
Kth secondary control is carried out to host frequency, the pressure regulator output of control alternating current generating sets G0 is host target voltage UAVRk, right
Host voltage carries out kth secondary control.
Discrete PI D control process are as follows:
KF in formulapScale parameter, the KF of host governor are controlled for host power distribution controlleriFor main engine power point
Integral parameter, KF with controller control host governordThe differential of host governor is controlled for host power distribution controller
Parameter.KVpScale parameter, the KV of host pressure regulator are controlled for host power distribution controlleriFor host power distribution controller control
Integral parameter, the KV of host pressure regulator processeddThe differential parameter of host pressure regulator is controlled for host power distribution controller.Actually make
Used time tests selected power distribution controller, governor and pressure regulator, to the above parameter using gather value method determine.
ΔFiDifference on the frequency, the Δ V of host when being controlled for i-thiThe voltage difference of host when being controlled for i-th.ΔFk-1It is
The difference on the frequency of host, Δ V when k-1 secondary controlk-1The voltage difference of host when for -1 secondary control of kth.
After n times iterative process, host object frequency UGOVkIt is equal with the rated frequency Fref of host, and
Host object voltage UAVRkWhen equal with the voltage rating Vref of host, the power distribution controller E0 of host is completed to host
Control process.
Since host and load connection cables are most short, loss is minimum, it is ensured that load voltage, frequency more approach stabilization.
Slave is responsible for keeping the active power of itself, reactive power can be according to active power total on bus, reactive power
Certain proportion stable operation.
It is communicated between all power distribution controllers, communication data includes the real-time wattful power of each alternating current generating sets
Rate, reactive power, rated active power, reactive power.The power distribution controller of slave acquires parallel running system in real time
Data calculate real-time voltage, the real-time frequency, real-time active power, real-time nothing of slave according to the collected data and communication data
Real-time total active power, reactive power, specified total active power, reactive power in function power and parallel system.
In attached drawing 1, it is known that the rated active power of G0 ... Gn is respectively RP0 ... RPn, and rated reactive power is respectively
RQ0 ... RQn, when parallel running, real-time total active, the reactive power power for loading F is PF, QF.So slave Gx presses power
Px, Qx stable operation.
Px=PF* (RPx/ (RP0+RP1+ ...+RPn))
Qx=QF* (RQx/ (RQ0+RQ1+ ...+RQn))
Generating set Gx is total one of all generating set G1 ... Gn, and Px is alternating current generating sets Gx active power
Distribution adjustment target value, Qx are alternating current generating sets Gx reactive power distribution adjustment target value.
The power distribution controller Ex of slave by target active power, target reactive power and the real-time active power of slave,
Reactive power power makes the difference, target active-power P x and slave real-time active-power P when obtaining kth secondary controlkDifference DELTA Pk、
Target reactive power Q x and slave reactive power power QkDifference DELTA Qk.The power distribution controller Ex control exchange hair of slave
The governor output valve of motor group Gx is slave target active-power P GOVk, kth secondary control is carried out to slave active power, is led to
The pressure regulator output valve for crossing control alternating current generating sets Gx is slave target reactive power PAVRk, slave reactive power is carried out
Kth secondary control.
Control uses discrete PID control.Such as Fig. 3.
Discrete PI D control process are as follows:
KP in formulapScale parameter, the KP of slave governor are controlled for slave power distribution controlleriFor slave power point
Integral parameter, KP with controller control slave governordThe differential of slave governor is controlled for slave power distribution controller
Parameter.KQpScale parameter, the KQ of slave pressure regulator are controlled for slave power distribution controlleriFor slave power distribution controller control
Integral parameter, the KQ of slave pressure regulator processeddThe differential parameter of slave pressure regulator is controlled for slave power distribution controller.Actually make
Used time tests selected power distribution controller, governor and pressure regulator, to the above parameter using gather value method determine.
ΔPiWhen for i-th control active power is poor, Δ QiReactive power when controlling for i-th is poor.ΔPk-1Kth -1
Active power when secondary control is poor, Δ Qk-1Reactive power when -1 secondary control of kth is poor.
After n times iterative process, slave target active-power P GOVkWith alternating current generating sets Gx active power
Distribution adjustment target Px is equal, and slave target reactive power PAVRkAdjustment mesh is distributed with alternating current generating sets Gx reactive power
When mark Qx is equal, the power distribution controller Ex of slave completes the control process to slave Gx.
When host G0 exits parallel running, other alternating current generating sets continue parallel running, the friendship close from load regulation two
Stream generating set G1 is changed to host, is responsible for keeping voltage, frequency stabilization in voltage rating, frequency.And so on.
When each alternating current generating sets and load connection cables be equidistant, load host, slave differentiation can be according to exchange
The serial number of generating set provides, can artificially provide that the alternating current generating sets of the minimum or maximum serial number in parallel running are host,
Artificially to all power distribution controller input AC generating set serial numbers, power distribution controller by communication compare oneself with
The size of other power distribution controller serial numbers, automatic distinguishing host and slave, for fixing smallest sequence number and be host: serial number
1,2,3, No. 4 alternating current generator sets in parallel operation, No. 1 is host, other are slave, after exiting parallel running for No. 1, No. 2
It is changed to host, other are still slave.
In conclusion the present invention provides a kind of alternating current generator sets in parallel operation power distribution sides of dissymmetrical structure
Method, the distribution method proof load end voltage, frequency can remain specified, become without the variation because of bearing power
Change；Active power, the reactive power for guaranteeing that each alternating current generating sets undertake simultaneously can be allocated according to proper proportion, without
It will appear biggish difference.
Although having been combined preferred embodiment to be described in detail the present invention, those skilled in the art are answered
What it is when understanding is without prejudice to spirit of that invention and essence, and various amendments are all allowed, they both fall within this hair
Among bright scope of protection of the claims.
Claims (9)
1. a kind of alternating current generator sets in parallel operation power distribution method of dissymmetrical structure, which is characterized in that every exchange hair
Motor group is equipped with power distribution controller；All alternating current generating sets are identified as host and slave by power distribution controller；It is main
The power distribution controller control host of machine is run under rated frequency and voltage rating；The power distribution controller of slave controls
Slave is run in the case where active power distributes adjustment target value and reactive power distribution adjustment target value；
The active power distribution adjustment target value Px of slave Gx are as follows:
Px=PF* (RPx/ (RP0+RP1+ ...+RPn))
The reactive power distribution adjustment target value Qx of slave Gx are as follows:
Qx=QF* (RQx/ (RQ0+RQ1+ ...+RQn))
Wherein: RPx is the rated active power of slave Gx, and RQx is the rated reactive power of slave Gx；Generating set G0 ... Gn
Rated active power be respectively RP0 ... RPn, rated reactive power is respectively RQ0 ... RQn；G0 is host, G1 ... Gn
For slave；PF is the real-time total active power for loading F, QF is the reactive power power for loading F.
2. power distribution method according to claim 1, which is characterized in that the host is most short with load connection cables
Alternating current generating sets, other alternating current generating sets be slave.
3. power distribution method according to claim 2, which is characterized in that power distribution controller identification host and
The process of slave are as follows:
To the cable distance of all power distribution controller input AC generating sets and load, power distribution controller passes through logical
Letter compares the distance of installed generating set and the distance load of other generating sets, will connection cables are shortest exchanges with load
Generating set is set to host, other alternating current generating sets are set to slave.
4. power distribution method according to claim 1, which is characterized in that the power distribution controller of the host controls
Host is run under rated frequency and voltage rating, specifically:
The power distribution controller acquisition real-time voltage of host of host, real-time frequency, by the voltage rating Vref of host, specified
Frequency Fref respectively with host real-time voltage Vk, real-time frequency FkIt makes the difference, obtains rated frequency Fref and host real-time frequency Fk's
Difference DELTA Fk, voltage rating Vref and host real-time voltage VkDifference DELTA Vk, using discrete PID control method control host
Governor output is host target frequency UGOVk, the pressure regulator output for controlling host is host target voltage UAVRk；K is control
Number.
5. power distribution method according to claim 4, which is characterized in that the host object frequency UGOVkAre as follows:
Wherein: KFpThe scale parameter of host governor is controlled for host power distribution controller；KFiFor the control of host power distribution
The integral parameter of device control host governor；KFdThe differential parameter of host governor is controlled for host power distribution controller；Δ
FiThe difference on the frequency of host when being controlled for i-th；ΔFk-1The difference on the frequency of host when for -1 secondary control of kth；K is control number.
6. power distribution method according to claim 4, which is characterized in that the host object voltage UAVRkAre as follows:
Wherein, KVpThe scale parameter of host pressure regulator is controlled for host power distribution controller；KViFor the control of host power distribution
The integral parameter of device control host pressure regulator；KVdThe differential parameter of host pressure regulator is controlled for host power distribution controller；Δ
ViThe voltage difference of host when being controlled for i-th；ΔVk-1The voltage difference of host when for -1 secondary control of kth；K is control number.
7. power distribution method according to claim 1, which is characterized in that the power distribution controller of the slave controls
Slave is run in the case where active power distributes adjustment target value and reactive power distribution adjustment target value, specifically:
The power distribution controller of slave is by target active power, target reactive power and the real-time active power of slave, real-time nothing
Function power makes the difference, target active-power P x and the real-time active-power P of slavekDifference DELTA Pk, target reactive power Q x and slave it is real
When reactive power QkDifference DELTA Qk；Use the governor output valve of discrete PID control method control slave active for slave target
Power P GOVk, the pressure regulator output valve for controlling slave is slave target reactive power PAVRk；K is control number.
8. power distribution method according to claim 7, which is characterized in that the slave target active-power P GOVkAre as follows:
Wherein: KPpThe scale parameter of slave governor is controlled for slave power distribution controller；KPiFor the control of slave power distribution
The integral parameter of device control slave governor；KPdThe differential parameter of slave governor is controlled for slave power distribution controller；Δ
PiThe active power of slave is poor when controlling for i-th；ΔPk-1The active power of slave is poor when -1 secondary control of kth；K is control time
Number.
9. power distribution method according to claim 7, which is characterized in that the slave target reactive power PAVRkAre as follows:
Wherein, KQpThe scale parameter of slave pressure regulator is controlled for slave power distribution controller；KQiFor the control of slave power distribution
The integral parameter of device control slave pressure regulator；KQdThe differential parameter of slave pressure regulator is controlled for slave power distribution controller；Δ
QiThe reactive power of slave is poor when controlling for i-th；ΔQk-1The reactive power of slave is poor when -1 secondary control of kth；K is control time
Number.
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| CN111497642A (en) * | 2020-03-24 | 2020-08-07 | 广西玉柴机器股份有限公司 | Cluster type generator set control method |
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| CN201846094U (en) * | 2010-10-28 | 2011-05-25 | 福州马尾闽东新科技工业有限公司 | Parallel generator set |
| CN105811421A (en) * | 2016-03-17 | 2016-07-27 | 上海电力学院 | Improved droop control based microgrid auxiliary master-slave control method |
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| US20150295581A1 (en) * | 2014-04-10 | 2015-10-15 | Nec Laboratories America, Inc. | Distributed Cooperative Control for Microgrid Resynchronization and Reconnection |
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| CN201846094U (en) * | 2010-10-28 | 2011-05-25 | 福州马尾闽东新科技工业有限公司 | Parallel generator set |
| CN105811421A (en) * | 2016-03-17 | 2016-07-27 | 上海电力学院 | Improved droop control based microgrid auxiliary master-slave control method |
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