CN105024403A - Islanding and grid-connected signal control system and method for micro power grid - Google Patents
Islanding and grid-connected signal control system and method for micro power grid Download PDFInfo
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Abstract
The invention discloses an islanding and grid-connected signal control system and method for a micro power grid. The islanding and grid-connected signal control method includes judging whether a transformer substation sends state signals to the micro power grid or not through detecting voltage or current signals between a point of public coupling on a micro power grid side and a power-connection circuit breaker and sending a switching command to the grid-connection circuit breaker by a micro power grid control system at an appreciate time point according to signal types for assisting the micro power grid to transfer between the islanding state and the power-connected state. The system includes a control system, a pulse signal system and a voltage detection system. The system and method provided by the invention are stable and reliable in performance. According to the invention, a main power grid can inform the micro power grid of an incoming operation state actively by a reliable means, so that the cost is reduced substantially. The micro power grid can be assisted to transfer between the islanding operation state and the grid-connected operation state quickly and smoothly, so that safe and reliable operation of the micro power grid is facilitated. Requirements for effective control of the micro power grid by a power grid operator are met.
Description
Technical field
The invention belongs to micro-capacitance sensor islanding detect technical field, particularly relate to a kind of micro-capacitance sensor isolated island and grid-connected whistle control system and method.
Background technology
Micro-capacitance sensor not only solves traditional centralized power generation, superhigh pressure long distance power transmission and the interconnected centralized power supply system of bulk power grid in the problem such as Supply Security and poor reliability, can also fully development and utilization regenerative resource and clean energy resource, be used widely just rapidly.Micro-capacitance sensor controls to have flexibility: under normal circumstances, micro-capacitance sensor can run on grid-connect mode to electrical network; Electrical grid failure, micro-capacitance sensor can in time and electrical network disconnect and run on island mode, to maintain local network electrical network, frequency stabilization, ensure to load reliable power supply.One of key issue that micro-capacitance sensor controls flexibly is islanding detect problem.Because the inner distributed generation system of micro-capacitance sensor is incorporated into the power networks different with the control strategy of islet operation, only detects island state, micro-capacitance sensor could be determined from the pattern of being incorporated into the power networks to the switching of islet operation pattern, ensure stability and the reliability of power supply.Island detection method generally can be divided into passive method and active technique.Passive method detects the characteristic of basic electric parameters, is characterized on the quality of power supply without impact, but there is islanding detect blind area.Active technique is departed from normal table working point by active disturbance or positive feedback initiating system thus is realized islanding detect, is characterized in reducing or to eliminate islanding detect blind area, but its active disturbance introduced has a negative impact to the quality of power supply.In addition, the island detection method based on power line carrier communication and system monitoring data acquisition is higher due to input cost, is not used widely.System voltage amplitude or frequency departure to failure operation scope, thus are judged isolated island by tradition non-blind area island detection method, and its essence belongs to destructive island detection method.
But, it is normal and stable that micro-capacitance sensor islet operation control overflow maintains system voltage amplitude frequency, if take traditional destructive non-blind area island detection method, although can isolated island be detected, but now system voltage amplitude or frequency are in failure operation scope, may occur in the transient process switched to islet operation pattern by the pattern of being incorporated into the power networks because reference voltage and virtual voltage difference occur larger transient process greatly.
Summary of the invention
The object of the present invention is to provide a kind of micro-capacitance sensor isolated island and grid-connected whistle control system and method, be intended to solve in the transient process switched to islet operation pattern by the pattern of being incorporated into the power networks, take traditional destructive non-blind area island detection method may occur because the problem of larger transient process appears greatly in reference voltage and virtual voltage difference.
The present invention realizes like this, a kind of micro-capacitance sensor isolated island and grid-connected signal control method, described micro-capacitance sensor isolated island and grid-connected signal control method are between micro-capacitance sensor side point of common coupling and grid-connected circuit breaker, judge whether transformer station sends status signal to micro-capacitance sensor by detection voltage or current signal, and send opening and closing order on suitable opportunity to grid-connected circuit breaker by micro grid control system according to the type of signal, assist micro-capacitance sensor in island state and and transition between net state.
Further, described micro-capacitance sensor isolated island and grid-connected signal control method specifically comprise the following steps:
Step one, by voltage or the current signal of voltage transformer or current transformer measurement point, to detect in voltage or current signal whether well-regulated pulse signal, if pulse signal do not detected, then continue to detect, until the whole control logic of external trigger terminates always;
Step 2, judges the type of pulse signal, and what send according to the type decision transformer station of pulse signal is island state signal or grid-connected status signal;
Step 3, sends isolated island signal or grid-connected signal to micro grid control system, then sends disconnection or close command according to suspension or grid-connected conditions system to grid-connected circuit breaker by micro grid control system;
Step 4, when external trigger terminator, control procedure terminates.
Further, the generation control method of described status signal is as follows:
Step one, to substation control system inquiry transformer station operational mode whether change, with determine micro-capacitance sensor will run on island state or and net state;
Step 2, island state signal produces and controls:
When determining that transformer station no longer powers to micro-capacitance sensor, judging that micro-capacitance sensor will be in island state, otherwise returning step one, to the open and-shut mode of substation control system inquiry feeder breaker.If feeder breaker is now in closure state, then send ON-and OFF-command; If feeder breaker is in off-state, then keep motionless, guarantee that feeder breaker is in off-state;
By measuring the voltage of feeder line point to judge whether micro-capacitance sensor initiatively disconnects with major network, if feeder line point exists voltage, then judging that micro-capacitance sensor also keeps being connected with major network, needing initiatively to send signal notice and being in island state, needing to disconnect with major network; If voltage do not detected at feeder line point, then judge that micro-capacitance sensor disconnects in major network, no longer needs to send island state signal, returns step one; Trigger turn on thyristors, send island state signal;
Step 3, grid-connected signal produces and controls:
When determining that transformer station powers to micro-capacitance sensor, judge that micro-capacitance sensor will be in and net state, otherwise return step one, trigger turn on thyristors, send grid-connected signal, when external trigger terminator, control procedure terminates.
Another object of the present invention is to provide a kind of micro-capacitance sensor isolated island and grid-connected whistle control system, described micro-capacitance sensor isolated island and grid-connected whistle control system comprise:
Control system, for communicating, the control task that produces of isolated island and grid-connected condition adjudgement and signal, communicates with substation control system, the operational mode of inquiry transformer station; The feeder voltage measured by feeder voltage detection system judges whether micro-capacitance sensor disconnects with major network; Control thyristor, to determine the rule of opportunity of turn on thyristors, angle of flow size and conducting, and distinguish isolated island signal and grid-connected signal with conducting rule;
Pulse signal system, is connected with described control system, comprises transformer, anti-parallel thyristor and drive circuit, and in the voltage range that power distribution network high voltage drop is born to thyristor by transformer, Limited Current is excessive; When anti-parallel thyristor and drive circuit electric energy receive send the order of status signal to micro-capacitance sensor time, triggering and conducting thyristor near voltage over zero;
Voltage detecting system, be connected with described pulse signal system, for the analog signal of original for transformer station voltage transformer or digital signal are introduced voltage detecting system, be used for measuring the voltage after substation feeder circuit breaker disconnects on feeder line, judge whether micro-capacitance sensor disconnects with major network for control system according to feeder voltage.
Further, described micro-capacitance sensor isolated island and grid-connected whistle control system are arranged on the substation feeder circuit breaker port of export.
Micro-capacitance sensor isolated island provided by the invention and grid-connected whistle control system and method, compared with prior art, have following advantage:
1. integrated isolated island, grid-connected status signal result from measuring ability, stable and reliable for performance.
2. reliable its state that will run of means proactive notification micro-capacitance sensor that enable main electrical network self have, and do not need, by means of wired, wireless telecommunications or electric line carrier communication, to greatly reduce cost.
3. the present invention is a kind of non-blind area, nondestructive island detection method, can assist micro-capacitance sensor island operation state and to be incorporated into the power networks between state fast, transition smoothly, contribute to micro-capacitance sensor and run safely and steadly.
4. the present invention can meet the demand that operation of power networks side control effectively to micro-capacitance sensor.
Accompanying drawing explanation
Fig. 1 is the micro-capacitance sensor isolated island that provides of the embodiment of the present invention and grid-connected signal generation system structural representation;
In figure: 1, control system; 2, pulse signal system; 3, voltage detecting system;
Fig. 2 is the turn on thyristors triggering signal schematic diagram that the embodiment of the present invention provides;
In figure: (a) thyristor isolated island triggering signal, two anti-parallel thyristors are in each zero crossing conducting of voltage; B the grid-connected triggering signal of () thyristor, only has a thyristor only in voltage zero crossing conducting from positive to negative;
Fig. 3 is that the micro-capacitance sensor isolated island that provides of the embodiment of the present invention and grid-connected signal produce control method flow chart;
Fig. 4 is the micro-capacitance sensor side isolated island that provides of the embodiment of the present invention and grid-connected input control method flow chart.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Of the present invention a kind of with the system of thyristor for main composition, isolated island signal or grid-connected signal is sent to micro-capacitance sensor by the operational mode of inquiring about transformer station, assist micro-capacitance sensor island state and and net state between fast, transition smoothly, reach the object of micro-capacitance sensor safety, stable operation.
Below in conjunction with accompanying drawing, structure of the present invention and application principle are described in detail:
As shown in Figure 1, the micro-capacitance sensor isolated island of the embodiment of the present invention and grid-connected status signal produce the composition of system as shown in Figure 1, and micro-capacitance sensor isolated island and grid-connected status signal produce system and be arranged on the substation feeder circuit breaker B1 port of export, form primarily of with lower part:
Control system 1, the control task that executive communication, isolated island and grid-connected condition adjudgement and signal produce, communicates with substation control system, the operational mode of inquiry transformer station; The feeder voltage measured by feeder voltage detection system judges whether micro-capacitance sensor disconnects with major network; Control thyristor, to determine the rule etc. of opportunity of turn on thyristors, angle of flow size and conducting, and distinguish isolated island signal and grid-connected signal with conducting rule.
Pulse signal system 2, is connected with control system 1, mainly contains the compositions such as transformer, anti-parallel thyristor and drive circuit thereof.The effect of transformer is in the voltage range that power distribution network high voltage drop can be born to thyristor, prevent thyristor during inoperative by high electrical breakdown or conduction period electric current excessive and burnt; In addition, because the capacity of this transformer is very little, the effect that Limited Current is excessive can also be played.Anti-parallel thyristor and drive circuit electric energy Main Function thereof be when receive to send the order of status signal to micro-capacitance sensor time, the angle of flow that triggering one is very little near voltage over zero, now turn on thyristors, be equivalent to short circuit, feeder line will flow through electric current, is equivalent to inject a current pulse signal to system; During turn on thyristors, voltage levvl is very low, is equivalent near voltage over zero, create a Voltage Drop, changes the waveform of voltage, therefore also just creates a voltage signal that can be identified.
Voltage detecting system 3, be connected with pulse signal system 2, the analog signal of original for transformer station voltage transformer or digital signal are introduced voltage detecting system, be used for measuring the voltage after substation feeder circuit breaker B1 disconnects on feeder line, judge whether micro-capacitance sensor disconnects with major network for control system according to feeder voltage.
It is as follows that concrete status signal produces control strategy:
(1) whether the operational mode to substation control system inquiry transformer station changes, to determine that micro-capacitance sensor will run on island state or and net state.Transformer station initiatively may disconnect with micro-capacitance sensor because of reasons such as maintenance, maintenance, and also may disconnect with micro-capacitance sensor because the reason of fault is passive, now micro-capacitance sensor will run on island state.After major network maintenance, overhauling complete or failture evacuation, transformer station can power to micro-capacitance sensor again, and now micro-capacitance sensor will run on and net state.If transformer station does not change the running status of micro-capacitance sensor, then inquire about its running status to substation control system always.
(2) island state signal produces control strategy
1., when determining that transformer station no longer powers to micro-capacitance sensor, judging that micro-capacitance sensor will be in island state, otherwise returning step (1).
2. to the open and-shut mode of substation control system inquiry feeder breaker B1.If feeder breaker B1 is now in closure state, then send ON-and OFF-command to it; If feeder breaker B1 is in off-state, then keep motionless.Guarantee that feeder breaker B1 is in off-state.
3. by measuring the voltage of feeder line P1 point to judge whether micro-capacitance sensor initiatively disconnects with major network.If P1 point exists voltage, then judge that micro-capacitance sensor also keeps being connected with major network, need initiatively to send signal and notify that it is in island state, need to disconnect with major network; If voltage do not detected at P1 point, then judge that micro-capacitance sensor disconnects with major network, no longer needs to send island state signal, returns step (1).
4. trigger turn on thyristors, send island state signal.Specify each zero crossing conducting of two anti-parallel thyristors at voltage, as the identification feature of isolated island signal, as shown in Fig. 2 (a).Return step 3 zero after signal sends, whether disconnect with major network to detect micro-capacitance sensor.
(3) grid-connected signal produces control strategy
1., when determining that transformer station powers to micro-capacitance sensor, judging that micro-capacitance sensor will be in and net state, otherwise returning step (1).
2. trigger turn on thyristors, send grid-connected signal.Regulation only has a thyristor only in voltage zero crossing conducting from positive to negative, as the identification feature of grid-connected signal, as shown in Fig. 2 (b).Step (1) is returned after signal sends.
(4) when external trigger terminator, control procedure terminates.
Micro-capacitance sensor isolated island, grid-connected signal produce control flow as shown in Figure 3.
2. micro-capacitance sensor side isolated island, grid-connected status signal detection system
Isolated island, grid-connected status signal detection system are arranged between micro-capacitance sensor side point of common coupling (PCC) and grid-connected circuit breaker B2, judge whether transformer station sends status signal to micro-capacitance sensor by the voltage or current signal that detect P2 point, and send opening and closing order on suitable opportunity to grid-connected circuit breaker B2 by micro grid control system according to the type of signal, assist micro-capacitance sensor in island state and also transition between net state, its concrete control strategy is as follows:
(1) voltage or the current signal of P2 point is measured by voltage transformer or current transformer, to detect in voltage or current signal whether well-regulated pulse signal, if pulse signal do not detected, then continue to detect, until the whole control logic of external trigger terminates always.
(2) judge the type of pulse signal, what send according to the type decision transformer station of pulse signal is island state signal or grid-connected status signal.
(3) send isolated island signal or grid-connected signal to micro grid control system, then send disconnection or close command according to suspension or grid-connected conditions system to grid-connected circuit breaker B2 by micro grid control system.
(4) when external trigger terminator, control procedure terminates.
Micro-capacitance sensor side isolated island, grid-connected input control flow are as shown in Figure 4.
The main device that the present invention adopts MJYS-QKZL-30 intelligence thyristor to produce as signal, this thyristor module is except containing except three-phase anti-parallel thyristor, also be integrated with intelligent drives, control module, the main feature of this intelligent thyristor module has: (1) adopts full-digital phase-shifting to trigger integrated circuit, achieve control circuit and thyristor rectifier is integrated, make module possess the power regulation function of vulnerabilities scan forceful electric power; (2) module pressure drop is little, low in energy consumption, efficiency is high, and power savings is good; (3) trigger control circuit reliability is high; (4) circuits for triggering, main circuit and conductive sole plate are mutually isolated, and conductive sole plate is not charged, and dielectric strength >=2500V (RMS), ensures personal safety; (5) 0 ~ 10V DC control signal or 0 ~ 5V DC control signal, 4 ~ 20mA instrument signal is inputted, all can realize the smoothing adjustment of main circuit output voltage, annunciator control system adopts ATxmega256A3BU chip as host CPU, this chip has the operation dominant frequency of the highest 32MHZ, flash, 16K SRAM able to programme in the sheet of 256+8K; Chip has abundant peripheral interface, the various hardware circuit of convenient expansion; The communication of control system and substation control system adopts RS485 serial bus interface, RS485 bus is a kind of communication bus be most widely used, support half-or full-duplex pattern, support multipoint data communication, there is the features such as transmission range is long, antijamming capability is strong.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a micro-capacitance sensor isolated island and grid-connected signal control method, it is characterized in that, described micro-capacitance sensor isolated island and grid-connected signal control method are between micro-capacitance sensor side point of common coupling and grid-connected circuit breaker, judge whether transformer station sends status signal to micro-capacitance sensor by detection voltage or current signal, and send opening and closing order on suitable opportunity to grid-connected circuit breaker by micro grid control system according to the type of signal, assist micro-capacitance sensor in island state and and transition between net state.
2. micro-capacitance sensor isolated island as claimed in claim 1 and grid-connected signal control method, it is characterized in that, described micro-capacitance sensor isolated island and grid-connected signal control method specifically comprise the following steps:
Step one, by voltage or the current signal of voltage transformer or current transformer measurement point, to detect in voltage or current signal whether well-regulated pulse signal, if pulse signal do not detected, then continue to detect, until the whole control logic of external trigger terminates always;
Step 2, judges the type of pulse signal, and what send according to the type decision transformer station of pulse signal is island state signal or grid-connected status signal;
Step 3, sends isolated island signal or grid-connected signal to micro grid control system, then sends disconnection or close command according to suspension or grid-connected conditions system to grid-connected circuit breaker by micro grid control system;
Step 4, when external trigger terminator, control procedure terminates.
3. micro-capacitance sensor isolated island as claimed in claim 2 and grid-connected signal control method, it is characterized in that, the generation control method of described status signal is as follows:
Step one, to substation control system inquiry transformer station operational mode whether change, with determine micro-capacitance sensor will run on island state or and net state;
Step 2, island state signal produces and controls:
When determining that transformer station no longer powers to micro-capacitance sensor, judging that micro-capacitance sensor will be in island state, otherwise returning step one; To the open and-shut mode of substation control system inquiry feeder breaker; If feeder breaker is now in closure state, then send ON-and OFF-command; If feeder breaker is in off-state, then keep motionless, guarantee that feeder breaker is in off-state;
By measuring the voltage of feeder line point to judge whether micro-capacitance sensor initiatively disconnects with major network, if feeder line point exists voltage, then judging that micro-capacitance sensor keeps being connected with major network, needing initiatively to send signal notice and being in island state, needing to disconnect with major network; If voltage do not detected at feeder line point, then judge that micro-capacitance sensor disconnects with major network, no longer needs to send island state signal, returns step one; Trigger turn on thyristors, send island state signal;
Step 3, grid-connected signal produces and controls:
When determining that transformer station powers to micro-capacitance sensor, judge that micro-capacitance sensor will be in and net state, otherwise return step one, trigger turn on thyristors, send grid-connected signal, when external trigger terminator, control procedure terminates.
4. micro-capacitance sensor isolated island and a grid-connected whistle control system, is characterized in that, described micro-capacitance sensor isolated island and grid-connected whistle control system comprise:
Control system, for communicating, the control task that produces of isolated island and grid-connected condition adjudgement and signal, communicates with substation control system, the operational mode of inquiry transformer station; The feeder voltage measured by feeder voltage detection system judges whether micro-capacitance sensor disconnects with major network; Control thyristor, to determine the rule of opportunity of turn on thyristors, angle of flow size and conducting, and distinguish isolated island signal and grid-connected signal with conducting rule;
Pulse signal system, is connected with described control system, comprises transformer, anti-parallel thyristor and drive circuit, and in the voltage range that power distribution network high voltage drop is born to thyristor by transformer, Limited Current is excessive; Anti-parallel thyristor and drive circuit electric energy when receive to send the order of status signal to micro-capacitance sensor time, triggering and conducting thyristor near voltage over zero;
Voltage detecting system, be connected with described pulse signal system, for the analog signal of original for transformer station voltage transformer or digital signal are introduced voltage detecting system, be used for measuring the voltage after substation feeder circuit breaker disconnects on feeder line, judge whether micro-capacitance sensor disconnects with major network for control system according to feeder voltage.
5. micro-capacitance sensor isolated island as claimed in claim 4 and grid-connected whistle control system, it is characterized in that, described micro-capacitance sensor isolated island and grid-connected whistle control system are arranged on the substation feeder circuit breaker port of export.
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Inventor after: Huo Xianxu Inventor after: Wang Zhijun Inventor after: Wang Xudong Inventor after: Zhao Honglei Inventor after: Zhu Xiaohui Inventor after: Yu Jiancheng Inventor after: Xu Ke Inventor after: Ji Ming Inventor after: Su Jingyu Inventor before: Huo Xianxu Inventor before: Wang Zhijun Inventor before: Wang Xudong Inventor before: Zhu Xiaohui Inventor before: Ji Ming Inventor before: Su Jingyu |
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