CN103728521A - Synchronous time service remote communication type island detection method and system - Google Patents
Synchronous time service remote communication type island detection method and system Download PDFInfo
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- CN103728521A CN103728521A CN201410026336.5A CN201410026336A CN103728521A CN 103728521 A CN103728521 A CN 103728521A CN 201410026336 A CN201410026336 A CN 201410026336A CN 103728521 A CN103728521 A CN 103728521A
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Abstract
The invention provides a synchronous time service remote communication type island detection system which comprises a central controller. The central controller obtains a per-second pulse signal synchronous with the international standard time through satellite time service, acquires voltage frequency signals of public connecting points between a large power grid and a micro-power grid, acquires voltage frequency output by a power station through a remote communication network and is communicated with a grid-connected inverter control unit and a micro-power grid energy storage unit through a micro-power grid management network. Different from other active island detection methods, periodic disturbance is not required to be kept constantly, disturbance is exerted only under the condition of a suspected island, and accordingly the synchronous time service remote communication type island detection system has small influence on the electric energy quality.
Description
Technical field
The invention belongs to micro-electric power network technique field, be specifically related to a kind of synchronous time service telecommunication formula island detection method and system.
Background technology
Current serious energy resource supply and the dual-pressure of greenhouse gas emission of facing of China.China must complete the energy and make the transition in 20 years from now on～30 years, and Renewable Energy Development is the only way of China's energy and environment sustainable development.
Tradition isolated island detection technique is divided into the detection of passive type isolated island and active alone island detects two kinds.Common passive type isolated island detection method has: whether the amplitude, frequency or the phase place that detect common point voltage exceed normal range; Detect common point harmonic wave and change whether exceed normal range.Passive type isolated island detects and all has larger detection blind area, so generally all will detect to dwindle detection blind area in conjunction with active alone island, active alone island detection method is to be undertaken by combining inverter output current is carried out to periodic disturbance, therefore the quality of power supply is had impact and can cause inverter system unstable.
Summary of the invention
The technical problem to be solved in the present invention is: a kind of synchronous time service telecommunication formula island detection method and system are provided, the electrical network quality of power supply is affected less and detected fast.
The present invention for solving the problems of the technologies described above taked technical scheme is: a kind of synchronous time service telecommunication formula alone island detection system, it is characterized in that: it comprises central controller, central controller time service acquisition via satellite keeps the pps pulse per second signal of synchronizeing with universal time, the voltage-frequency signal of the points of common connection between the large electrical network of central controller collection and micro-electrical network, central controller gathers power station output voltage frequency by telecommunications network, central controller is communicated by letter with micro-electrical network energy-storage units with combining inverter control module by micro-administration of power networks network.
By said system, described satellite time transfer adopts U.S.'s satellite gps system or China Satecom's dipper system.
A synchronous time service telecommunication formula island detection method that utilizes above-mentioned synchronous time service telecommunication formula alone island detection system to realize, is characterized in that: it comprises the following steps:
Time service acquisition via satellite keeps the pps pulse per second signal of synchronizeing with universal time, makes the voltage signal of the points of common connection between large electrical network and micro-electrical network and power station output voltage have unified time tag;
Step 2, signals collecting and processing:
Gather the voltage signal of the points of common connection between large electrical network and micro-electrical network, and calculate points of common connection electric voltage frequency and corresponding signals collecting moment with it;
Collection power station output voltage frequency and the with it moment of correspondence;
Step 3, judge isolated island phenomenon:
Monitor and compare the difference of synchronization points of common connection electric voltage frequency and power station output voltage frequency, if the two difference increases suddenly, send the interior energy-storage units of the micro-electrical network of instruction control or the active frequency displacement isolated island of combining inverter synchronization implementation detection method and determine whether generation isolated island.
As stated above, described step 2 calculate points of common connection electric voltage frequency and with it the concrete mode in corresponding signals collecting moment be: by the voltage signal of the points of common connection between the large electrical network collecting and micro-electrical network, be converted to rectangular signal, by relatively the time of the adjacent rising edge of this rectangular signal is tried to achieve points of common connection electric voltage frequency and cycle; By GPS pulse per second (PPS) and with time tag obtain the universal time corresponding with frequency detecting value.
Beneficial effect of the present invention is:
1, be different from other active alone island detection methods, the present invention does not need moment hold period disturbance, only in doubtful isolated island situation, applies disturbance, therefore less on quality of power supply impact.
2, being different from the isolated island of implementing that existing isolated island detection method generally adopts on combining inverter detects, the method is given micro-electrical network central controller by isolated island measuring ability and is completed, alleviated the control algolithm complicacy of combining inverter, removed the coupling influence of active alone island detection with combining inverter power control/frequency control, interference/weakening that while also thoroughly having eliminated multi-inverter parallel operation, isolated island detects between disturbance causes isolated island to detect failed factor.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of one embodiment of the invention.
Fig. 2 is the schematic diagram of zero cross detection circuit.
Fig. 3 is the workflow diagram of one embodiment of the invention.
Embodiment
Below in conjunction with instantiation, the present invention will be further described.
Fig. 1 is the structured flowchart of one embodiment of the invention, it comprises central controller, central controller time service acquisition via satellite keeps the pps pulse per second signal of synchronizeing with universal time, central controller gathers the voltage-frequency signal of the points of common connection between large electrical network and micro-electrical network by zero cross detection circuit (as shown in Figure 2), central controller gathers power station output voltage frequency by telecommunications network, and central controller is communicated by letter with micro-electrical network energy-storage units with combining inverter control module by micro-administration of power networks network.Satellite time transfer can adopt the various ways such as U.S.'s satellite gps system or China Satecom's dipper system, adopts gps receiver in the present embodiment.
Fig. 3 is the workflow diagram of one embodiment of the invention, and it comprises the following steps:
Step 2, signals collecting and processing: gather the voltage signal of the points of common connection between large electrical network and micro-electrical network, and calculate points of common connection electric voltage frequency and corresponding signals collecting moment with it.
Calculate points of common connection electric voltage frequency and with it the concrete mode in corresponding signals collecting moment be: by the voltage signal of the points of common connection of the large electrical network collecting and combining inverter side, be converted to rectangular signal, try to achieve points of common connection electric voltage frequency and cycle by time of the adjacent rising edge of this rectangular signal relatively, that is:
Step 3, judge isolated island phenomenon: monitor and compare synchronization points of common connection electric voltage frequency f
n+1with power station output voltage frequency f
n+1' difference, if the two difference increases suddenly, may there is isolated island phenomenon, now send again the micro-electrical network energy-storage units of instruction control or the active frequency displacement isolated island of combining inverter synchronization implementation method determines whether generation isolated island.
Active frequency displacement isolated island detect its principle be by combining inverter to electrical network injected frequency a little the electric current of some distortion to form a trend that continuously changes frequency.When electrical network is normally worked, due to the effect of clamping down on of electrical network, points of common connection frequency is not injected disturbance with inverter and is changed; After electrical network escape, points of common connection frequency can diminish because disturbance is upwards offset to become large or offset downward, and because this variation of cause of phaselocked loop can continue to increase, so just can detect isolated island.
The present invention had carried out a preliminary judgement before the active frequency displacement isolated island detection method of employing determines whether that isolated island phenomenon occurs, only when doubtful generation isolated island phenomenon, just combining inverter output current is carried out to disturbance, avoided active frequency displacement isolated island detection method to carry out periodic disturbance to combining inverter output current on the one hand, less on quality of power supply impact; On the other hand, when carrying out active frequency displacement disturbance, frequency displacement instruction unification is from micro-electrical network central controller, all combining inverter output disturbances act in agreement, and interference/weakening that while having eliminated multi-inverter parallel operation, isolated island detects between disturbance causes isolated island to detect failed factor.
Claims (4)
1. a synchronous time service telecommunication formula alone island detection system, it is characterized in that: it comprises central controller, central controller time service acquisition via satellite keeps the pps pulse per second signal of synchronizeing with universal time, the voltage-frequency signal of the points of common connection between the large electrical network of central controller collection and micro-electrical network, central controller gathers power station output voltage frequency by telecommunications network, and central controller is communicated by letter with micro-electrical network energy-storage units with combining inverter control module by micro-administration of power networks network.
2. synchronous time service telecommunication formula alone island detection system according to claim 1, is characterized in that: described satellite time transfer adopts U.S.'s satellite gps system or China Satecom's dipper system.
3. a synchronous time service telecommunication formula island detection method that utilizes synchronous time service telecommunication formula alone island detection system as claimed in claim 1 or 2 to realize, is characterized in that: it comprises the following steps:
Step 1, signal are synchronous:
Time service acquisition via satellite keeps the pps pulse per second signal of synchronizeing with universal time, makes the voltage signal of the points of common connection between large electrical network and micro-electrical network and power station output voltage have unified time tag;
Step 2, signals collecting and processing:
Gather the voltage signal of the points of common connection between large electrical network and micro-electrical network, and calculate points of common connection electric voltage frequency and corresponding signals collecting moment with it;
Collection power station output voltage frequency and the with it moment of correspondence;
Step 3, judge isolated island phenomenon:
Monitor and compare the difference of synchronization points of common connection electric voltage frequency and power station output voltage frequency, if the two difference increases suddenly, send the interior energy-storage units of the micro-electrical network of instruction control or the active frequency displacement isolated island of combining inverter synchronization implementation detection method and determine whether generation isolated island.
4. synchronous time service telecommunication formula island detection method according to claim 3, it is characterized in that: described step 2 calculate points of common connection electric voltage frequency and with it the concrete mode in corresponding signals collecting moment be: by the voltage signal of the points of common connection between the large electrical network collecting and micro-electrical network, be converted to rectangular signal, by relatively the time of the adjacent rising edge of this rectangular signal is tried to achieve points of common connection electric voltage frequency and cycle.
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Cited By (3)
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| CN107947232A (en) * | 2017-12-05 | 2018-04-20 | 山东理工大学 | Frequency micro-grid operational control method and system are determined in a kind of synchronization |
| CN107976609A (en) * | 2017-11-27 | 2018-05-01 | 王建安 | A kind of isolated network identifying system and method |
| CN108008218A (en) * | 2017-11-27 | 2018-05-08 | 王建安 | A kind of micro-, minor scale power net running rate recognizing method |
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| CN103728521B (en) | 2016-08-17 |
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