CN104242340A - Stable control method in switching process from micro-grid non-planned grid connection operation mode to isolated island operation mode - Google Patents
Stable control method in switching process from micro-grid non-planned grid connection operation mode to isolated island operation mode Download PDFInfo
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Abstract
The invention discloses a stable control method in the switching process from a micro-grid non-planned grid connection operation mode to an isolated island operation mode. The means that the micro-grid power and load capacity adjustment is combined with the adjustment of the output power of an energy storage unit is adopted, the micro-grid operation frequency and the voltage level are detected in real time, so that feedback control is realized, and the micro grid can operate stably in the switching process from the non-planned grid connection operation mode to the isolated island operation mode ultimately. The safety of electrical equipment is guaranteed, uninterruptible power supply of important users is guaranteed, and thus a good application prospect can be achieved.
Description
Technical field
The present invention relates to the unplanned grid-connected stable control method turned when islet operation pattern switches of a kind of micro-capacitance sensor, belong to micro-capacitance sensor and run control technology field.
Background technology
The primary energy such as traditional coal, oil are non-renewable; improve the utilization of efficiency of energy utilization, the regenerative resource that taps a new source of energy, strengthens, just become the energy demand growth that solves and day by day highlight in economic and social fast development process and energy scarcity, the inevitable choice of contradiction between using energy source and environmental protection.
At present, photovoltaic generation, wind power generation, fuel cell, miniature gas turbine, internal combustion engine distributed power supply are through long-term development, achieve significant progress technically, China plans the year two thousand twenty, nearly 1,000,000,000 kilowatts of generator total installation of generating capacity, wherein comprises the distributed energy proportion of small power station more than 20%.
Distributed power generation is incorporated into the power networks with the form of micro-capacitance sensor access bulk power grid; it is the most effective means playing distributed power generation energy supplying system usefulness; micro-capacitance sensor refer to collected by distributed power source, energy storage device, energy converter, associated loadings and monitoring, protective device be small-sizedly transported to electric system; be one can teaching display stand control, the autonomous system of protect and manage; both can be incorporated into the power networks with bulk power grid (connecting valve of micro-capacitance sensor and bulk power grid closes), also can islet operation (connecting valve of micro-capacitance sensor and bulk power grid disconnects).
Adopt micro-capacitance sensor technology, contribute to making full use of the abundant clean and regenerative resource in various places, there is provided " green electric power supply " to user, it is the Important Action realizing China's " energy-saving and emission-reduction " target, contribute to the energy supply quality improving distributed power generation, prevent large-area power-cuts to a certain extent, improve the safety and reliability of electric power system, strengthen the ability that electrical network is withstood natural calamities, contribute to cultivating the capability of independent innovation, promote the international competitiveness of China at energy technology field, also clearly propose to want Efforts To Develop " exploitation of regenerative resource low-coat scaleization " and " fitful power grid-connected and transmission & distribution technology " in China " National Program for Medium-to Long-term Scientific and Technological Development (2006-2020) ".
Micro-capacitance sensor is operational mode and high-quality electric service flexibly, be unable to do without perfect stable and control system, the difficult point of control problem also just in micro-capacitance sensor research and hot issue.Because micro-capacitance sensor has grid-connected and islet operation two kinds of operational modes, so micro-capacitance sensor is normally operated in three kinds of states: the state that is incorporated into the power networks, island operation state and the transient state switched between two kinds of running statuses, especially in unplanned situation, when the transient state that micro-capacitance sensor switches between two kinds of patterns, how maintaining the stability of micro-capacitance sensor, is current distributed power generation grid-connected needs solve topmost problem.
Summary of the invention
When the object of the invention is to overcome micro-grid connection and islet operation two kinds of operational modes switching transient state, how to maintain the problem of the stability of micro-capacitance sensor.Micro-capacitance sensor of the present invention unplanned grid-connected turn islet operation pattern switch time stable control method, ensure micro-capacitance sensor unplanned grid-connected turn islet operation pattern switch time voltage and frequency stable, be convenient to realize, have a good application prospect.
In order to achieve the above object, the technical solution adopted in the present invention is:
The unplanned grid-connected stable control method turned when islet operation pattern switches of micro-capacitance sensor, is characterized in that: comprise the following steps,
Step (1), transfers micro-capacitance sensor and the measured data that unplanned isolated island switches front 1s occurs, comprise micro-grid connection point active-power P 1, reactive power Q 1; Total load active-power P 2, reactive power Q 2 in micro-capacitance sensor; Total active-power P 3, the reactive power Q 3 of distributed power source in microgrid; Active-power P 4, the reactive power Q 4 of energy-storage travelling wave tube in microgrid; Master control power supply energy-storage travelling wave tube active-power P 5, reactive power Q 5 when piconet island runs; Diesel engine generator active-power P 6, reactive power Q 6 in micro-capacitance sensor;
Step (2), calculates difference active power Δ P=P1+P5, difference reactive power Δ Q=Q1+Q5;
Step (3), if difference active power Δ P>0, then cut-out burden with power, resection is Δ P; If difference active power Δ P<0, then cut-out is gained merit power supply, and resection is | Δ P|;
Step (4), if difference reactive power Δ Q>0, then cut-out burden with power, resection is Δ Q; If difference reactive power Δ Q<0, then cut-out is gained merit power supply, and resection is | Δ Q|;
Step (5), disconnects the grid-connected switch P CC of micro-grid connection point;
Step (6), switches to the permanent frequency mode of constant voltage by the operational mode of master control power supply energy-storage travelling wave tube;
Step (7), master control power supply energy-storage travelling wave tube gathers voltage U 1 and the frequency f 1 of now micro-capacitance sensor run 3s under the permanent frequency mode of constant voltage after, and judges whether to meet the condition as formula (1),
k
1U
N<U1<k
2U
N
f
N-k
3<f1<f
N+k
4 (1)
Wherein, U
nfor micro-capacitance sensor rating operating voltage, f
nfor micro-capacitance sensor nominal operating frequency, k
1for safety low-pressure coefficient, k
2for overvoltage coefficient of safety, k
3for low frequency coefficient of safety, k
4for overfrequency coefficient of safety, k
1value at 0.8 ~ 0.9, k
2value at 1.1 ~ 1.2, k
3value at 0.5 ~ 1, k
4value 0.8 ~ 1.5;
If meet formula (1), then perform step (8); If do not meet formula (1), disconnect all loads, power supply, diesel engine generator and energy-storage travelling wave tube switch in micro-capacitance sensor, and send handoff failure warning;
Step (8), arranging diesel engine generator in micro-capacitance sensor is the permanent frequency mode of constant voltage, puts into operation; And the operational mode of master control power supply energy-storage travelling wave tube is switched to permanent frequency mode, active power of output P=0 is set, output reactive power Q=0;
Step (9), when after operation 3s, gathers voltage U 2 and the frequency f 2 of now micro-capacitance sensor, and judges whether to meet the condition as formula (2),
k
1U
N<U2<k
2U
N
f
N-k
3<f2<f
N+k
4 (2)
Step (10), if meet formula (2), then unplannedly grid-connectedly turns islet operation pattern handover success; If do not meet formula (2), disconnect all loads, power supply, diesel engine generator and energy-storage travelling wave tube switch in micro-capacitance sensor, and send handoff failure warning.
The unplanned grid-connected stable control method turned when islet operation pattern switches of aforesaid micro-capacitance sensor, is characterized in that: described micro-capacitance sensor rating operating voltage U
nvalue 100V, micro-capacitance sensor nominal operating frequency f
nvalue is 50Hz.
The unplanned grid-connected stable control method turned when islet operation pattern switches of aforesaid micro-capacitance sensor, it is characterized in that: to be Δ P and cut-out power supply of gaining merit be in described step (3) cut-out burden with power | Δ P|, be carry out burden with power according to the priority that presets or meritorious power supply selects excision, excise successively from low to high according to priority-level.
The unplanned grid-connected stable control method turned when islet operation pattern switches of aforesaid micro-capacitance sensor, it is characterized in that: to be Δ Q and cut-out power supply of gaining merit be in described step (4) cut-out burden with power | Δ Q|, be carry out burden with power according to the priority that presets or meritorious power supply selects excision, excise successively from low to high according to priority-level.
The invention has the beneficial effects as follows: the unplanned grid-connected stable control method turned when islet operation pattern switches of micro-capacitance sensor of the present invention, adopt power supply, load capacity in adjustment micro-capacitance sensor, and the means that adjustment energy-storage units power output combines, the running frequency of real-time detection micro-capacitance sensor and voltage levvl, in order to realize FEEDBACK CONTROL, finally realize micro-capacitance sensor in the unplanned grid-connected stable operation turned when islet operation pattern switches, ensure various electric equipment safety, ensure the uninterrupted power supply of responsible consumer, have a good application prospect.
Accompanying drawing explanation
Fig. 1 is the unplanned grid-connected flow chart of stable control method turned when islet operation pattern switches of micro-capacitance sensor of the present invention.
Fig. 2 is the typical micro-capacitance sensor structural representation of one embodiment of the invention.
Embodiment
Below in conjunction with Figure of description, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
The unplanned grid-connected stable control method turned when islet operation pattern switches of micro-capacitance sensor of the present invention, adopt power supply, load capacity in adjustment micro-capacitance sensor, and the means that adjustment energy-storage units power output combines, the running frequency of real-time detection micro-capacitance sensor and voltage levvl, in order to realize FEEDBACK CONTROL, finally realize micro-capacitance sensor in the unplanned grid-connected stable operation turned when islet operation pattern switches, ensure various electric equipment safety, ensure the uninterrupted power supply of responsible consumer, as shown in Figure 1, specifically comprise the following steps
Step (1), transfers micro-capacitance sensor and the measured data that unplanned isolated island switches front 1s occurs, comprise micro-grid connection point (PCC) active-power P 1, reactive power Q 1; Total load active-power P 2, reactive power Q 2 in micro-capacitance sensor; Total active-power P 3, the reactive power Q 3 of distributed power source in microgrid; Active-power P 4, the reactive power Q 4 of energy-storage travelling wave tube in microgrid; Master control power supply energy-storage travelling wave tube active-power P 5, reactive power Q 5 when piconet island runs; Diesel engine generator active-power P 6, reactive power Q 6 in micro-capacitance sensor;
Step (2), calculates difference active power Δ P=P1+P5, difference reactive power Δ Q=Q1+Q5;
Step (3), if difference active power Δ P>0, then cut-out burden with power, resection is Δ P; If difference active power Δ P<0, then cut-out is gained merit power supply, resection is | Δ P|, here cut-out burden with power is Δ P (as Δ P>0), cut-out power supply of gaining merit is | Δ P| (as Δ P<0), being the priority (onsite application personnel determine according to the significance level of load and power supply) according to presetting, excising successively from low to high according to rank;
Step (4), if difference reactive power Δ Q>0, then cut-out burden with power, resection is Δ Q; If difference reactive power Δ Q<0, then cut-out is gained merit power supply, resection is | Δ Q|, here cut-out burden with power is Δ Q (as Δ Q>0), cut-out power supply of gaining merit is | Δ Q| (as Δ Q<0), being the priority (onsite application personnel determine according to the significance level of load and power supply) according to presetting, excising successively from low to high according to rank;
Step (5), disconnects the grid-connected switch P CC of micro-grid connection point;
Step (6), switches to the permanent frequency mode (U/f pattern) of constant voltage by the operational mode of master control power supply energy-storage travelling wave tube;
Step (7), master control power supply energy-storage travelling wave tube gathers voltage U 1 and the frequency f 1 of now micro-capacitance sensor run 3s under the permanent frequency mode of constant voltage after, and judges whether to meet the condition as formula (1),
k
1U
N<U1<k
2U
N
f
N-k
3<f1<f
N+k
4 (1)
Wherein, U
nfor micro-capacitance sensor rating operating voltage, f
nfor micro-capacitance sensor nominal operating frequency, k
1for safety low-pressure coefficient, k
2for overvoltage coefficient of safety, k
3for low frequency coefficient of safety, k
4for overfrequency coefficient of safety, according to simulation analysis and the test of engineering actual motion, k
1can value be 0.8 ~ 0.9, k
2can value be 1.1 ~ 1.2, k
3can value be 0.5 ~ 1, k
4can value be 0.8 ~ 1.5;
If meet formula (1), then perform step (8); If do not meet formula (1), disconnect all loads, power supply, diesel engine generator and energy-storage travelling wave tube switch in micro-capacitance sensor, and send handoff failure warning;
Step (8), arranging diesel engine generator in micro-capacitance sensor is the permanent frequency mode (U/f pattern) of constant voltage, puts into operation; And the operational mode of master control power supply energy-storage travelling wave tube is switched to permanent frequency mode (PQ pattern), active power of output P=0 is set, output reactive power Q=0;
Step (9), when after operation 3s, gathers voltage U 2 and the frequency f 2 of now micro-capacitance sensor, and judges whether to meet the condition as formula (2),
k
1U
N<U2k
2U
N
f
N-k
3<f2<f
N+k
4 (2)
The definition of each parameter is consistent with formula (1);
Step (10), if meet formula (2), then unplannedly grid-connectedly turns islet operation pattern handover success; If do not meet formula (2), disconnect all loads, power supply, diesel engine generator and energy-storage travelling wave tube switch in micro-capacitance sensor, and send handoff failure warning.
Above-mentioned micro-capacitance sensor rating operating voltage U
nvalue 100V, micro-capacitance sensor nominal operating frequency f
nvalue is 50Hz.
Below according to the unplanned grid-connected stable control method turned when islet operation pattern switches of the micro-capacitance sensor of invention, receive a specific embodiment.
As shown in Figure 2, for typical microgrid structural representation, comprise distributed power source, diesel engine, the energy-storage travelling wave tube 2 as master control power supply, general energy-storage travelling wave tube 1, equivalent load, microgrid is connected with bulk power grid by PCC switch, U, f are measuring voltage on microgrid bus and frequency, energy-storage travelling wave tube all accesses microgrid by PCS and runs, and P1 ~ P6, Q1 ~ Q6 are active power and the reactive power of measuring each parts in real time.
When microgrid need to carry out in unplanned situation grid-connected turn the operational mode conversion of isolated island time, power measurements before 1 second transferring preservation immediately, comprise P1 ~ P6, Q1 ~ Q6, (concrete meaning is shown in step (1)) establishes P1=10kW, Q1=5kVar, P2=50kW, Q2=25kVar, P3=15kW, Q3=7kVar, P4=10kW, Q4=5kVar, P5=15kW, Q5=8kVar, P6=0kW, Q6=0kVar now, now diesel engine generator exits, KG disconnects
By calculating Δ P=25kW, Δ Q=13kVar, due to Δ P>0, Δ Q>0, need to excise corresponding load power, after this, P2=25kW, Q2=12kVar, afterwards, disconnecting PCC switch, is U/f pattern by the control mode switch of PCS2;
At above-mentioned handover operation after 3 seconds, detect microgrid busbar voltage U and frequency f, if U
n=100V (secondary rated value) and f
n=50Hz, k
1value is 0.88, k
2value is 1.1, k
3value is 0.7, k
4value is 0.7.If U<88V or U>110V or f<49.3Hz or f>50.7Hz, then disconnect all loads, distributed power source, diesel engine generator and energy-storage travelling wave tube switch in microgrid, microgrid pattern handoff failure, no longer carry out other operations, wait for and follow-uply carry out black starting-up.
88V<U<110V and 49.3Hz<f<50.7Hz if the voltage U of above-mentioned detection and frequency f satisfy condition, then arranging diesel engine generator operational mode is U/f pattern, and the KG switch that closes puts into operation, the energy-storage travelling wave tube 2 switched as master control power supply arrives PQ operational mode, arranges P5=0kW, Q5=0kVar.
Switch latter 3 seconds in the operational mode completing energy-storage travelling wave tube 2, detect microgrid busbar voltage U and frequency f, if U
n=100V (secondary rated value) and f
n=50Hz, k
1value is 0.88, k
2value is 1.1, k
3value is 0.7, k
4value is 0.7.
88V<U<110V and 49.3Hz<f<50.7Hz if voltage U and frequency f satisfy condition, then terminate computing and operation, pattern handover success.If U<88V or U>110V or f<49.3Hz or f>50.7Hz, then disconnect all loads, distributed power source, diesel engine generator and energy-storage travelling wave tube switch in microgrid, microgrid pattern handoff failure, no longer carry out other operations, wait for and follow-uply carry out black starting-up.
More than show and describe general principle of the present invention, principal character and advantage.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection range is defined by appending claims and equivalent thereof.
Claims (4)
1. the unplanned grid-connected stable control method turned when islet operation pattern switches of micro-capacitance sensor, is characterized in that: comprise the following steps,
Step (1), transfers micro-capacitance sensor and the measured data that unplanned isolated island switches front 1s occurs, comprise micro-grid connection point active-power P 1, reactive power Q 1; Total load active-power P 2, reactive power Q 2 in micro-capacitance sensor; Total active-power P 3, the reactive power Q 3 of distributed power source in microgrid; Active-power P 4, the reactive power Q 4 of energy-storage travelling wave tube in microgrid; Master control power supply energy-storage travelling wave tube active-power P 5, reactive power Q 5 when piconet island runs; Diesel engine generator active-power P 6, reactive power Q 6 in micro-capacitance sensor;
Step (2), calculates difference active power Δ P=P1+P5, difference reactive power Δ Q=Q1+Q5;
Step (3), if difference active power Δ P>0, then cut-out burden with power, resection is Δ P; If difference active power Δ P<0, then cut-out is gained merit power supply, and resection is | Δ P|;
Step (4), if difference reactive power Δ Q>0, then cut-out burden with power, resection is Δ Q; If difference reactive power Δ Q<0, then cut-out is gained merit power supply, and resection is | Δ Q|;
Step (5), disconnects the grid-connected switch P CC of micro-grid connection point;
Step (6), switches to the permanent frequency mode of constant voltage by the operational mode of master control power supply energy-storage travelling wave tube;
Step (7), master control power supply energy-storage travelling wave tube gathers voltage U 1 and the frequency f 1 of now micro-capacitance sensor run 3s under the permanent frequency mode of constant voltage after, and judges whether to meet the condition as formula (1),
k
1U
N<U1<k
2U
N
f
N-k
3<f1<f
N+k
4 (1)
Wherein, U
nfor micro-capacitance sensor rating operating voltage, f
nfor micro-capacitance sensor nominal operating frequency, k
1for safety low-pressure coefficient, k
2for overvoltage coefficient of safety, k
3for low frequency coefficient of safety, k
4for overfrequency coefficient of safety, k
1value at 0.8 ~ 0.9, k
2value at 1.1 ~ 1.2, k
3value at 0.5 ~ 1, k
4value 0.8 ~ 1.5;
If meet formula (1), then perform step (8); If do not meet formula (1), disconnect all loads, power supply, diesel engine generator and energy-storage travelling wave tube switch in micro-capacitance sensor, and send handoff failure warning;
Step (8), arranging diesel engine generator in micro-capacitance sensor is the permanent frequency mode of constant voltage, puts into operation; And the operational mode of master control power supply energy-storage travelling wave tube is switched to permanent frequency mode, active power of output P=0 is set, output reactive power Q=0;
Step (9), when after operation 3s, gathers voltage U 2 and the frequency f 2 of now micro-capacitance sensor, and judges whether to meet the condition as formula (2),
k
1U
N<U2<k
2U
N
f
N-k
3<f2<f
N+k
4 (2)
Step (10), if meet formula (2), then unplannedly grid-connectedly turns islet operation pattern handover success; If do not meet formula (2), disconnect all loads, power supply, diesel engine generator and energy-storage travelling wave tube switch in micro-capacitance sensor, and send handoff failure warning.
2. the unplanned grid-connected stable control method turned when islet operation pattern switches of micro-capacitance sensor according to claim 1, is characterized in that: described micro-capacitance sensor rating operating voltage U
nvalue 100V, micro-capacitance sensor nominal operating frequency f
nvalue is 50Hz.
3. the unplanned grid-connected stable control method turned when islet operation pattern switches of micro-capacitance sensor according to claim 1, it is characterized in that: to be Δ P and cut-out power supply of gaining merit be in described step (3) cut-out burden with power | Δ P|, be carry out burden with power according to the priority that presets or meritorious power supply selects excision, excise successively from low to high according to priority-level.
4. the unplanned grid-connected stable control method turned when islet operation pattern switches of micro-capacitance sensor according to claim 1, it is characterized in that: to be Δ Q and cut-out power supply of gaining merit be in described step (4) cut-out burden with power | Δ Q|, be carry out burden with power according to the priority that presets or meritorious power supply selects excision, excise successively from low to high according to priority-level.
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| CN106253325A (en) * | 2016-07-28 | 2016-12-21 | 河北省电力建设调整试验所 | Improve the method for the isolated power grid electrical network quality of power supply before and after powerful device start and stop |
| CN106253325B (en) * | 2016-07-28 | 2018-07-20 | 河北省电力建设调整试验所 | The method of isolated power grid power grid power quality before and after improvement powerful device start and stop |
| CN108832652A (en) * | 2018-05-25 | 2018-11-16 | 中国南方电网有限责任公司电网技术研究中心 | Islanded system stability control method, device and equipment containing centralized photovoltaic |
| CN110336315A (en) * | 2019-06-04 | 2019-10-15 | 深圳供电局有限公司 | A kind of receiving end city partial electric grid isolated power grid control system |
| CN110336315B (en) * | 2019-06-04 | 2023-03-03 | 深圳供电局有限公司 | Isolated network operation control system for local power grid of receiving-end city |
| CN111987723A (en) * | 2020-09-01 | 2020-11-24 | 云南电网有限责任公司电力科学研究院 | Micro-grid operation control method |
| CN111987723B (en) * | 2020-09-01 | 2023-08-25 | 云南电网有限责任公司电力科学研究院 | Micro-grid operation control method |
| CN112134311A (en) * | 2020-09-15 | 2020-12-25 | 广东电网有限责任公司韶关供电局 | Control method, device, equipment and storage medium for small hydropower station power grid |
| CN112165116A (en) * | 2020-09-18 | 2021-01-01 | 广东电网有限责任公司韶关供电局 | Handling method and device for small hydropower system with unplanned island effect |
| CN112165116B (en) * | 2020-09-18 | 2022-06-28 | 广东电网有限责任公司韶关供电局 | Handling method and device for small hydropower system with unplanned island effect |
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