CN105207271B - A kind of method of lonely net and grid-connect mode seamless switching in cold, heat and power triple supply system - Google Patents
A kind of method of lonely net and grid-connect mode seamless switching in cold, heat and power triple supply system Download PDFInfo
- Publication number
- CN105207271B CN105207271B CN201510558242.7A CN201510558242A CN105207271B CN 105207271 B CN105207271 B CN 105207271B CN 201510558242 A CN201510558242 A CN 201510558242A CN 105207271 B CN105207271 B CN 105207271B
- Authority
- CN
- China
- Prior art keywords
- grid
- mode
- frequency
- voltage
- cold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The method of lonely net and grid-connect mode seamless switching in disclosure cold, heat and power triple supply system, described lonely net pattern switches to the method for grid-connect mode to include increase mode switch function in synchronous device; Cold, heat and electricity triple supply mode controller receives lonely net pattern and switches to grid-connect mode request instruction and operation of power networks state normal, starts synchronous device, regulator generator frequency and voltage; When generator frequency and voltage meet simultaneous interconnecting requirement and electromotor and electric network voltage phase difference absolute value less than definite value 1, the lonely net pattern of output switches to grid-connect mode action command; Control to be converted to power control by frequency modulation and voltage modulation for mode controller; When generator frequency and voltage meet simultaneous interconnecting requirement and electromotor and grid phase difference absolute value less than definite value 2, the grid-connected instruction of output generator; Grid-connect mode is switched to by lonely net pattern; Solve electromotor and need to stop the problems such as output causes having a power failure in handoff procedure and cold, heat and power triple supply system mode handover procedure disturbance is excessive.
Description
Technical field
The invention belongs to comprehensive utilization of energy field, particularly relate to a kind of method of lonely net and grid-connect mode seamless switching in cold, heat and power triple supply system.
Background technology
Cold, heat and electricity triple supply, i.e. CCHP(CombinedCooling, HeatingandPower), refer to that fuel gas generation equipment such as driving gas engine, miniature combustion engine or internal combustion engine with natural gas for main fuel runs, the electricity needs of supply of electric power user produced, the waste heat discharged after system generating by waste heat recovery utilizing equipment (waste heat boiler, refrigeration machine etc.) to user's heat supply, cooling. It is greatly improved the primary energy ratio of whole system in this way, it is achieved that the cascade utilization of the energy. May be provided for grid-connected electric power and do energy complementation, economic well-being of workers and staff and the efficiency of whole system are higher.
There are two kinds of mode of operations in cold, heat and power triple supply system: lonely net pattern and grid-connect mode. Under lonely net pattern, the control mode of cold, heat and electricity triple supply mode controller is frequency modulation and voltage modulation control, and the control mode under grid-connect mode is power control. When both of which switches over, seamless switching to be realized, it is impossible to load or electrical network were produced large impact. Both of which handoff procedure relates to the switching selecting switch and grid-connected switch of pattern in the prior art. Considering first switching control mode or grid-connected switch in handoff procedure, different sequencings can cause the impact impact that load or electrical network is different. In prior art, this cold, heat and power triple supply system there is the problem that cold, heat and power triple supply system is when being transformed into lonely net pattern from grid-connect mode, and electromotor needs to stop output, and load will have the dead electricity process of similar 10s; When from lonely net patten transformation to grid-connect mode, electromotor is also required to stop output, and load also will have the dead electricity process less than 10s.Cold, heat and power triple supply system mode handover procedure disturbance is excessive.
Summary of the invention
The technical problem to be solved in the present invention: a kind of method of lonely net and grid-connect mode seamless switching in cold, heat and power triple supply system is provided, to solve in prior art cold, heat and power triple supply system when being transformed into lonely net pattern from grid-connect mode or from lonely net patten transformation to grid-connect mode, electromotor needs to stop the technical problems such as output causes having a power failure in handoff procedure and cold, heat and power triple supply system mode handover procedure disturbance is excessive.
Technical solution of the present invention:
A kind of method of lonely net and grid-connect mode seamless switching in cold, heat and power triple supply system, it includes the method that lonely net pattern switches to grid-connect mode and grid-connect mode to switch to lonely net pattern, and described lonely net pattern switches to the method for grid-connect mode to include:
Step 1, in synchronous device increase mode switch function;
Step 2, cold, heat and electricity triple supply mode controller receive lonely net pattern when switching to grid-connect mode request instruction and operation of power networks state normal, start synchronous device, by synchronous device regulator generator frequency and voltage;
Step 3, when generator frequency and voltage meet simultaneous interconnecting requirement and electromotor and electric network voltage phase difference absolute value less than definite value 1, the lonely net pattern of synchronous device output switches to grid-connect mode action command;
Step 4, cold, heat and electricity triple supply mode controller receive after lonely net pattern switches to grid-connect mode action command, frequency modulation and voltage modulation control mode be converted to power control mode, and using currently detected electrical power as power control set point;
Step 5, when generator frequency and voltage meet simultaneous interconnecting requirement and electromotor and grid phase difference absolute value less than definite value 2, the grid-connected instruction of synchronous device output generator;
Step 6, generator connecting in parallel with system detected after, cold, heat and electricity triple supply mode controller is switched to grid-connect mode by lonely net pattern.
Mode switch function described in step 1, refers to that synchronous device switches leading time according to mode switch and calculates phase contrast, in conjunction with current phase difference, it is determined that mode switch switching command send the moment, the formula calculating phase contrast is:
In formula:Leading time both sides voltage phase difference is switched for mode switch;For electromotor and electrical network both sides difference on the frequency;For frequency difference rate of change;Leading time is switched for mode switch.
Operation of power networks state described in step 2 normally refers to grid-connected switch and is in gate-dividing state, line voltageIn range of nominal tension 90%Ue-110%Ue and mains frequencyIn rated frequency range 49.5Hz-50.5Hz, Ue is electrical network rated voltage.
Generator frequency described in step 3 and voltage meet simultaneous interconnecting requirement and refer to electromotor and electrical network both sides frequency-splittingAbsolute value less than 0.3Hz, electromotor and electrical network both sides voltage differenceAbsolute value less than 0.05, electromotor refers to mode switch switching leading time both sides voltage phase difference with electric network voltage phase difference absolute value less than definite value 1Absolute value is less than 5 ��.
Generator frequency described in step 5 and voltage meet simultaneous interconnecting requirement and refer to electromotor and electrical network both sides frequency-splittingAbsolute value less than 0.3Hz, electromotor and electrical network both sides voltage differenceAbsolute value less than 0.05; Mode switch switching leading time both sides voltage phase difference is referred to when electromotor and electric network voltage phase difference absolute value are less than definite value 2Absolute value is less than 1 ��.
Described grid-connect mode switches to the method for lonely net pattern to include:
Step A, grid-connect mode power control in Chirp module;
Step B, when Chirp module action the control mode of cold, heat and electricity triple supply mode controller by power control be converted to power control add Chirp control mode;
Step C, frequency fluctuation after stable are less than definite value and after the time delay n second, the control mode of cold, heat and electricity triple supply mode controller is controlled to add Chirp control mode by power and is converted to frequency modulation and voltage modulation control mode, and using currently detected frequency and voltage as the setting value of frequency modulation and pressure regulation, and output generator off-the-line instruction;
After step D, electromotor off-the-line, cold, heat and electricity triple supply mode controller is switched to lonely net pattern by grid-connect mode, and frequency modulation and voltage modulation setting value is 0.5Hz/min to 3Hz/min from currency by frequency modulation set point change speed, pressure regulation set point change speed is that 0.001Ue/s to 0.01Ue/s changes to default lonely net pattern lower frequency and voltage setting value, frequency modulation set point change speed is 0.5Hz/min to 3Hz/min, pressure regulation set point change speed is 0.001Ue/s to 0.01Ue/s, wherein: Ue is electrical network rated voltage.
Step E, when Chirp module is not operating, cold, heat and electricity triple supply mode controller receives grid-connect mode and switches to lonely net mode request instruction, cold, heat and electricity triple supply mode controller is converted to frequency modulation and voltage modulation control mode by power control mode, and using currently detected frequency and voltage as frequency modulation and pressure regulation setting value, then output generator off-the-line instruction;
After step F, electromotor off-the-line, cold, heat and electricity triple supply mode controller is switched to lonely net pattern by grid-connect mode, and frequency modulation and voltage modulation setting value is 0.5Hz/min to 3Hz/min from currency by frequency modulation set point change speed, and pressure regulation set point change speed is that 0.001Ue/s to 0.01Ue/s changes to default lonely net pattern lower frequency and voltage setting value.
Step G, when Chirp module not operating, cold, heat and electricity triple supply mode controller does not receive grid-connect mode and switches to lonely net mode request instruction, when cold, heat and electricity triple supply mode controller detects electromotor off-the-line, cold, heat and electricity triple supply mode controller is switched to lonely net pattern by grid-connect mode, control mode is controlled to be converted to frequency modulation and voltage modulation control by power, and frequency modulation and voltage modulation setting value is default lonely net pattern lower frequency and voltage setting value;
Step H, when Chirp module is not operating, cold, heat and electricity triple supply mode controller does not receive grid-connect mode and switches to lonely net mode request instruction, when cold, heat and electricity triple supply mode controller is not detected by electromotor off-the-line, returns step B and wait that logic performs next time.
Chirp module described in step A refers to the power correction signal of one FM module output of superposition on the power control set point of grid-connect mode, and described power correction signal is proportional to the deviation of frequency and rated value, and its algorithm is:
In formula:Power correction signal for the output of Chirp module;For the specified active power of electromotor;For momentary speed variation;For electromotor rated speed;The deviation value after dead band limits for electrical network rated frequency and generator frequency.
Chirp module action described in step B is the deviation value after dead band limits by electrical network rated frequency and generator frequencyJudge, whenTime, Chirp module does not have action; WhenTime, Chirp module action.
Described in step C, the frequency fluctuation after stablizing is less than definite value and after the time delay n second, and limits is+0.1Hz is 0.2s-5s to+0.5Hz, delay time n.
The lonely net pattern lower frequency preset described in step D, step F, step G and voltage setting value, frequency setting value is+49.5Hz to+50.5Hz, and voltage setting value is+0.9Ue to+1.1Ue, wherein: Ue is electrical network rated voltage.
Beneficial effects of the present invention:
Hinge structure of the present invention has following innovative point:
In lonely net pattern in grid-connect mode handoff procedure, utilize the high-speed sampling of synchronous device and quick computing function, synchronous device increases judgement and the instruction output of cold, heat and electricity triple supply mode changeover condition, enable the selection switch of synchronous device control model and grid-connected switch, thus can shorten mode selection switch switching and grid-connected switch switching interval time between both as far as possible, thus reducing cold, heat and power triple supply system disturbance to load and electrical network when pattern switches;
At grid-connect mode in lonely net mode handover procedure, Chirp module in the power of grid-connect mode controls. At grid collapses, cold, heat and power triple supply system is but without when electric network fault being detected, and the power control mode of cold, heat and electricity triple supply regulates output only according to electrical power instruction, and makes frequency departure rated value increasing. By increasing the frequency change that Chirp module can make cold, heat and power triple supply system cause according to electric network fault, adjust generated output power in time, it is prevented that fault spread. This Chirp module exports relation proportional to frequency departure, in opposite direction, it is possible to play the function of timely electric power grid frequency stabilization during electric network fault. Cold, heat and power triple supply system equifrequent regulate stable after, then carry out grid-connect mode to lonely net pattern switching, thus disturbance to load and electrical network when reducing pattern switching.
Hinge structure of the present invention has following remarkable advantage: achieve the seamless switching of two kinds of mode of operations of cold, heat and power triple supply system, it is to avoid electromotor stops output, thus avoiding the dead electricity of load; Decrease the impact to load and electrical network of the two kinds of work-mode switching process of cold, heat and power triple supply system, it is achieved that comparatively smooth switching. The invention solves in prior art cold, heat and power triple supply system when being transformed into lonely net pattern from grid-connect mode or from lonely net patten transformation to grid-connect mode, electromotor needs to stop the technical problems such as output causes having a power failure in handoff procedure and cold, heat and power triple supply system mode handover procedure disturbance is excessive.
Detailed description of the invention
The basic thought of the inventive method is by synchronous device and cold, heat and power triple supply system mode controller are transformed, make cold, heat and power triple supply system generator output voltage before and after pattern switching, frequency, the parameter such as power as close possible to, thus avoiding the situation needing electromotor to stop output owing to generator parameter deviation is too big before and after pattern switching, it is achieved that lonely net and grid-connect mode seamless switching in cold, heat and power triple supply system.
The inventive method in lonely net pattern in grid-connect mode handoff procedure, adopting following method:
Step 1, synchronous device increase mode switch function, enable synchronous device to control the selection switch of cold, heat and power triple supply system control model and grid-connected switch. Utilizing the high-speed sampling function of synchronous device, shortening the interval time between mode selection switch switching and grid-connected both switch switchings as far as possible, thus reducing the disturbance to load and electrical network.
Described mode switch function, refers to that synchronous device switches leading time according to mode switch and calculates phase contrast, in conjunction with current phase difference, it is determined that mode switch switching command send the moment, the formula calculating phase contrast is:
In formula:Leading time both sides voltage phase difference is switched for mode switch;For electromotor and electrical network both sides difference on the frequency;For frequency difference rate of change;Leading time is switched for mode switch.
Step 2, switch to grid-connect mode request instruction when cold, heat and electricity triple supply mode controller receives lonely net pattern, and when operation of power networks state is normal, start synchronous device, by synchronous device regulator generator frequency and voltage; Operation of power networks state normally refers to grid-connected switch and is in gate-dividing state, line voltageIn range of nominal tension 90%Ue-110%Ue and mains frequencyIn rated frequency range 49.5Hz-50.5Hz. Wherein: for electrical network rated voltage.
Step 3, when generator frequency and voltage meet simultaneous interconnecting requirement and electromotor and grid phase difference absolute value less than definite value 1, the lonely net pattern of synchronous device output switches to grid-connect mode action command; Generator frequency and voltage meet simultaneous interconnecting requirement and refer to electromotor and electrical network both sides frequency-splittingAbsolute value less than 0.3Hz, electromotor and electrical network both sides voltage differenceAbsolute value less than 0.05Ue, electromotor refers to mode switch switching leading time both sides voltage phase difference with electric network voltage phase difference absolute value less than definite value 1Absolute value is less than 5 ��.
Step 4, cold, heat and electricity triple supply mode controller receive after lonely net pattern switches to grid-connect mode action command, frequency modulation and voltage modulation control mode be converted to power control mode, and using currently detected electrical power as power control set point;
Why adopt currently detected electrical power as power control set point, be in order to lonely net pattern switches to grid-connect mode to take over seamlessly as far as possible. Under lonely net pattern, electromotor is adjusted as setting value by cold, heat and electricity triple supply mode controller with frequency and the voltage set, after switching to grid-connect mode, electromotor is adjusted as setting value by cold, heat and electricity triple supply mode controller with the power set, if pattern has switched that moment, there is deviation in set value of the power and power actual sample value, will cause cold, heat and electricity triple supply mode controller adjustment action, load is impacted disturbance. When the electrical power detected after switching in mode is as power control set point, set value of the power keeps consistent with power actual sample value, the output of cold, heat and electricity triple supply mode controller remains unchanged, it is achieved thereby that lonely net pattern switches to taking over seamlessly of mode switch in grid-connect mode.
Step 5, when generator frequency and voltage meet simultaneous interconnecting requirement and electromotor and grid phase difference absolute value less than definite value 2, synchronous device export grid-connected instruction; Generator frequency and voltage meet simultaneous interconnecting requirement and refer to electromotor and electrical network both sides frequency-splittingAbsolute value less than 0.3Hz, electromotor and electrical network both sides voltage differenceAbsolute value less than 0.05Ue; Mode switch switching leading time both sides voltage phase difference is referred to when electromotor and electric network voltage phase difference absolute value are less than definite value 2Absolute value is less than 1 ��.
Step 6, generator connecting in parallel with system detected after, cold, heat and electricity triple supply mode controller is switched to grid-connect mode by lonely net pattern.
The inventive method at grid-connect mode in lonely net mode handover procedure, Chirp module in the power of grid-connect mode controls. At grid collapses, cold, heat and power triple supply system is but without when electric network fault being detected, the change that Chirp module occurs according to generator frequency, adjust generated output power in time, equifrequent regulates and carries out grid-connect mode after stablizing again to lonely net pattern switching, thus reducing the disturbance to load and electrical network.
Grid-connect mode switches to the concrete steps method of lonely net pattern to include:
Step A, grid-connect mode power control in Chirp module;Described Chirp module refers to the power correction signal of one FM module output of superposition on the power control set point of grid-connect mode, and described power correction signal is proportional to the deviation of frequency and rated value, and its algorithm is:
In formula:Power correction signal for the output of Chirp module;For the specified active power of electromotor;For momentary speed variation, value 5%;For electromotor rated speed, value 3000;The deviation value after dead band limits for electrical network rated frequency and generator frequency.
In FM module rightSet certain dead band, dead band value 0.034Hz, it may be assumed that
WhenTime,;
WhenTime,;
WhenTime,;
Wherein:
For electrical network rated frequency, value 50Hz;
For generator frequency;
Step B, when Chirp module action the control mode of cold, heat and electricity triple supply mode controller by power control be converted to power control add Chirp control mode;
Chirp module action is the deviation value after dead band limits by electrical network rated frequency and generator frequencyJudge, whenTime, Chirp module does not have action; WhenTime, Chirp module action.
It is act on set value of the power that Chirp controls, and carrys out corrected output setting value according to the difference of ongoing frequency Yu rated frequency, so that power adjustments is adjusted up to the side maintaining electrical network rated frequency.
Step C, frequency fluctuation after stable are less than definite value and after the time delay n second, the control mode of cold, heat and electricity triple supply mode controller is controlled to add Chirp control mode by power and is converted to frequency modulation and voltage modulation control mode, and using currently detected frequency and voltage as the setting value of frequency modulation and pressure regulation, and output generator off-the-line instruction;
Described frequency fluctuation after stablizing is less than definite value and after the time delay n second, and limits is+0.1Hz is 0.2s-5s to+0.5Hz, delay time n. Now it is believed that the frequency fluctuation temporary stabilization that causes of electric network fault, temporarily will not there is big change in the output of Chirp module.
Step C, adopt currently detected frequency and voltage respectively as the setting value of frequency modulation and pressure regulation, be in order to grid-connect mode switches to lonely net pattern to take over seamlessly as far as possible. Under grid-connect mode, electromotor is adjusted as setting value by cold, heat and electricity triple supply mode controller with the power set, after switching to lonely net pattern, electromotor is adjusted as setting value by cold, heat and electricity triple supply mode controller with frequency and the voltage set, if pattern has switched that moment, there is deviation in frequency setting value and frequency actual sample value, will cause cold, heat and electricity triple supply mode controller adjustment action, load is impacted disturbance.
When the frequency detected after switching in mode is as FREQUENCY CONTROL setting value, frequency setting value keeps consistent with frequency actual sample value, the output of cold, heat and electricity triple supply mode controller remains unchanged, it is achieved thereby that grid-connect mode switches to taking over seamlessly of mode switch in lonely net pattern.
When the voltage detected after switching in mode is as Control of Voltage setting value, voltage setting value keeps consistent with voltage actual sample value, the output of cold, heat and electricity triple supply mode controller remains unchanged, it is achieved thereby that grid-connect mode switches to taking over seamlessly of mode switch in lonely net pattern.
After step D, electromotor off-the-line, cold, heat and electricity triple supply mode controller is switched to lonely net pattern by grid-connect mode, and frequency modulation and voltage modulation setting value is changed to default lonely net pattern lower frequency and voltage setting value from currency by given pace;
Described default lonely net pattern lower frequency and voltage setting value, frequency setting value is+49.5Hz to+50.5Hz, and voltage setting value is+0.9Ue to+1.1Ue, it is preferable that frequency setting value is 50Hz, and voltage setting value is+1.0Ue.
Adopt frequency modulation and voltage modulation setting value from currency be changed to default lonely net pattern lower frequency by given pace and voltage setting value refer to pattern switching before the disturbance that causes of electric network fault make frequency and voltage have deviated from rated value, so needing after pattern switches smooth adjustment to default lonely net pattern lower frequency setting value and voltage setting value.
Step E, when Chirp module is not operating, cold, heat and electricity triple supply mode controller receives grid-connect mode and switches to lonely net mode request instruction, cold, heat and electricity triple supply mode controller is converted to frequency modulation and voltage modulation control mode by power control mode, and using currently detected frequency and voltage as frequency modulation and pressure regulation setting value, then output generator off-the-line instruction;
After step F, electromotor off-the-line, cold, heat and electricity triple supply mode controller is switched to lonely net pattern by grid-connect mode, and frequency modulation and voltage modulation setting value is changed to default lonely net pattern lower frequency and voltage setting value from currency by given pace;
Described default lonely net pattern lower frequency and voltage setting value, frequency setting value is+49.5Hz to+50.5Hz, and voltage setting value is+0.9Ue to+1.1Ue, it is preferable that frequency setting value is 50Hz, and voltage setting value is+1.0Ue.
Described frequency modulation and voltage modulation setting value changes from currency by given pace, frequency modulation set point change speed is 0.5Hz/min to 3Hz/min, pressure regulation set point change speed is 0.001Ue/s to 0.01Ue/s, preferred frequency modulation set point change speed is 1Hz/min, and pressure regulation set point change speed is 0.006Ue/s. Wherein: Ue is electrical network rated voltage.
Frequency modulation and voltage modulation setting value is changed to default lonely net pattern lower frequency from currency by given pace and voltage setting value refers to that grid-connect mode is probably different from the frequency lonely net pattern and voltage setting value, so needing after pattern switches smooth adjustment to default lonely net pattern lower frequency setting value and voltage setting value.
Step G, when Chirp module is not operating, cold, heat and electricity triple supply mode controller does not receive grid-connect mode and switches to lonely net mode request instruction, when cold, heat and electricity triple supply mode controller detects electromotor off-the-line, cold, heat and electricity triple supply mode controller is switched to lonely net pattern by grid-connect mode, control mode is controlled to be converted to frequency modulation and voltage modulation control by power, and frequency modulation and voltage modulation setting value is default lonely net pattern lower frequency and voltage setting value;
Described default lonely net pattern lower frequency and voltage setting value, frequency setting value is+49.5Hz to+50.5Hz, and voltage setting value is+0.9Ue to+1.1Ue, it is preferable that frequency setting value is 50Hz, and voltage setting value is+1.0Ue.
Step H, when Chirp module is not operating, cold, heat and electricity triple supply mode controller does not receive grid-connect mode and switches to lonely net mode request instruction, when cold, heat and electricity triple supply mode controller is not detected by electromotor off-the-line, returns step B and wait that logic performs next time.
Described frequency modulation and voltage modulation setting value changes from currency by given pace, frequency modulation set point change speed is 0.5Hz/min to 3Hz/min, pressure regulation set point change speed is 0.001Ue/s to 0.01Ue/s, preferred frequency modulation set point change speed is 1Hz/min, and pressure regulation set point change speed is 0.006Ue/s. Wherein: Ue is electrical network rated voltage.
Claims (10)
1. the method for lonely net and grid-connect mode seamless switching in a cold, heat and power triple supply system, it includes the method that lonely net pattern switches to grid-connect mode and grid-connect mode to switch to lonely net pattern, it is characterised in that: described lonely net pattern switches to the method for grid-connect mode to include:
Step 1, in synchronous device increase mode switch function;
Step 2, cold, heat and electricity triple supply mode controller receive lonely net pattern when switching to grid-connect mode request instruction and operation of power networks state normal, start synchronous device, by synchronous device regulator generator frequency and voltage;
Step 3, when generator frequency and voltage meet simultaneous interconnecting requirement and electromotor and electric network voltage phase difference absolute value less than definite value 1, the lonely net pattern of synchronous device output switches to grid-connect mode action command;
Step 4, cold, heat and electricity triple supply mode controller receive after lonely net pattern switches to grid-connect mode action command, frequency modulation and voltage modulation control mode be converted to power control mode, and using currently detected electrical power as power control set point;
Step 5, when generator frequency and voltage meet simultaneous interconnecting requirement and electromotor and grid phase difference absolute value less than definite value 2, the grid-connected instruction of synchronous device output generator;
Step 6, generator connecting in parallel with system detected after, cold, heat and electricity triple supply mode controller is switched to grid-connect mode by lonely net pattern.
2. the method for lonely net and grid-connect mode seamless switching in a kind of cold, heat and power triple supply system according to claim 1, it is characterized in that: mode switch function described in step 1, refer to that synchronous device switches leading time according to mode switch and calculates phase contrast, in conjunction with current phase difference, determining the moment that sends of mode switch switching command, the formula calculating phase contrast is:
In formula:Leading time both sides voltage phase difference is switched for mode switch;For electromotor and electrical network both sides difference on the frequency;For frequency difference rate of change;Leading time is switched for mode switch.
3. the method for lonely net and grid-connect mode seamless switching in a kind of cold, heat and power triple supply system according to claim 1, it is characterised in that: operation of power networks state described in step 2 normally refers to grid-connected switch and is in gate-dividing state, line voltageIn range of nominal tension 90%Ue-110%Ue and mains frequencyIn rated frequency range 49.5Hz-50.5Hz, Ue is electrical network rated voltage.
4. the method for lonely net and grid-connect mode seamless switching in a kind of cold, heat and power triple supply system according to claim 1, it is characterised in that: generator frequency described in step 3 and voltage meet simultaneous interconnecting requirement and refer to electromotor and electrical network both sides frequency-splittingAbsolute value less than 0.3Hz, electromotor and electrical network both sides voltage differenceAbsolute value less than 0.05Ue, electromotor refers to mode switch switching leading time both sides voltage phase difference with electric network voltage phase difference absolute value less than definite value 1Absolute value is less than 5 ��.
5. the method for lonely net and grid-connect mode seamless switching in a kind of cold, heat and power triple supply system according to claim 1, it is characterised in that: generator frequency described in step 5 and voltage meet simultaneous interconnecting requirement and refer to electromotor and electrical network both sides frequency-splittingAbsolute value less than 0.3Hz, electromotor and electrical network both sides voltage differenceAbsolute value less than 0.05Ue; Mode switch switching leading time both sides voltage phase difference is referred to when electromotor and electric network voltage phase difference absolute value are less than definite value 2Absolute value is less than 1 ��.
6. the method for lonely net and grid-connect mode seamless switching in a kind of cold, heat and power triple supply system according to claim 1, it is characterised in that: described grid-connect mode switches to the method for lonely net pattern to include:
Step A, grid-connect mode power control in Chirp module;
Step B, when Chirp module action the control mode of cold, heat and electricity triple supply mode controller by power control be converted to power control add Chirp control mode;
Step C, frequency fluctuation after stable are less than definite value and after the time delay n second, the control mode of cold, heat and electricity triple supply mode controller is controlled to add Chirp control mode by power and is converted to frequency modulation and voltage modulation control mode, and using currently detected frequency and voltage as the setting value of frequency modulation and pressure regulation, and output generator off-the-line instruction;
After step D, electromotor off-the-line, cold, heat and electricity triple supply mode controller is switched to lonely net pattern by grid-connect mode, and frequency modulation and voltage modulation setting value is 0.5Hz/min to 3Hz/min from currency by frequency modulation set point change speed, pressure regulation set point change speed is that 0.001Ue/s to 0.01Ue/s changes to default lonely net pattern lower frequency and voltage setting value, frequency modulation set point change speed is 0.5Hz/min to 3Hz/min, pressure regulation set point change speed is 0.001Ue/s to 0.01Ue/s, wherein: Ue is electrical network rated voltage;
Step E, when Chirp module is not operating, cold, heat and electricity triple supply mode controller receives grid-connect mode and switches to lonely net mode request instruction, cold, heat and electricity triple supply mode controller is converted to frequency modulation and voltage modulation control mode by power control mode, and using currently detected frequency and voltage as frequency modulation and pressure regulation setting value, then output generator off-the-line instruction;
After step F, electromotor off-the-line, cold, heat and electricity triple supply mode controller is switched to lonely net pattern by grid-connect mode, and frequency modulation and voltage modulation setting value is 0.5Hz/min to 3Hz/min from currency by frequency modulation set point change speed, and pressure regulation set point change speed is that 0.001Ue/s to 0.01Ue/s changes to default lonely net pattern lower frequency and voltage setting value;
Step G, when Chirp module not operating, cold, heat and electricity triple supply mode controller does not receive grid-connect mode and switches to lonely net mode request instruction, when cold, heat and electricity triple supply mode controller detects electromotor off-the-line, cold, heat and electricity triple supply mode controller is switched to lonely net pattern by grid-connect mode, control mode is controlled to be converted to frequency modulation and voltage modulation control by power, and frequency modulation and voltage modulation setting value is default lonely net pattern lower frequency and voltage setting value;
Step H, when Chirp module is not operating, cold, heat and electricity triple supply mode controller does not receive grid-connect mode and switches to lonely net mode request instruction, when cold, heat and electricity triple supply mode controller is not detected by electromotor off-the-line, returns step B and wait that logic performs next time.
7. the method for lonely net and grid-connect mode seamless switching in a kind of cold, heat and power triple supply system according to claim 6, it is characterized in that: Chirp module described in step A refers to the power correction signal of one FM module output of superposition on the power control set point of grid-connect mode, described power correction signal is proportional to the deviation of frequency and rated value, and its algorithm is:
In formula:Power correction signal for the output of Chirp module;For the specified active power of electromotor;For momentary speed variation;For electromotor rated speed;The deviation value after dead band limits for electrical network rated frequency and generator frequency.
8. the method for lonely net and grid-connect mode seamless switching in a kind of cold, heat and power triple supply system according to claim 6, it is characterised in that: Chirp module action described in step B is the deviation value after dead band limits by electrical network rated frequency and generator frequencyJudge, whenTime, Chirp module does not have action; WhenTime, Chirp module action.
9. the method for lonely net and grid-connect mode seamless switching in a kind of cold, heat and power triple supply system according to claim 6, it is characterized in that: described in step C, the frequency fluctuation after stablizing is less than definite value and after the time delay n second, limits is+0.1Hz is 0.2s-5s to+0.5Hz, delay time n.
10. the method for lonely net and grid-connect mode seamless switching in a kind of cold, heat and power triple supply system according to claim 6, it is characterized in that: the lonely net pattern lower frequency preset described in step D, step F, step G and voltage setting value, frequency setting value is+49.5Hz to+50.5Hz, voltage setting value is+0.9Ue to+1.1Ue, wherein: Ue is electrical network rated voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510558242.7A CN105207271B (en) | 2015-09-06 | 2015-09-06 | A kind of method of lonely net and grid-connect mode seamless switching in cold, heat and power triple supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510558242.7A CN105207271B (en) | 2015-09-06 | 2015-09-06 | A kind of method of lonely net and grid-connect mode seamless switching in cold, heat and power triple supply system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105207271A CN105207271A (en) | 2015-12-30 |
| CN105207271B true CN105207271B (en) | 2016-06-08 |
Family
ID=54954779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510558242.7A Active CN105207271B (en) | 2015-09-06 | 2015-09-06 | A kind of method of lonely net and grid-connect mode seamless switching in cold, heat and power triple supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105207271B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451563B (en) * | 2016-11-30 | 2019-03-29 | 中广核工程有限公司 | Simultaneous interconnecting operating method and device under generator of nuclear power station decoupled mode |
| CN110176758A (en) * | 2018-12-31 | 2019-08-27 | 天合光能股份有限公司 | A kind of novel friendship directly-heated is electrically coupled mixing microgrid control hierarchy control system |
| CN110021964A (en) * | 2019-01-28 | 2019-07-16 | 深圳供电局有限公司 | A kind of part isolated network stablizes the net source lotus distributed and coordinated control method of switching |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354974A (en) * | 2011-10-13 | 2012-02-15 | 山东大学 | Micro-grid multi-objective optimized operation control method |
| CN102882206A (en) * | 2012-08-28 | 2013-01-16 | 中国电力科学研究院 | Multilevel micro-electric network control method based on four-dimensional energy management space |
| CN104197763A (en) * | 2014-09-11 | 2014-12-10 | 南京圣诺热管有限公司 | Automatic control based heat storage type waste heat recovery device and method |
| CN104716644A (en) * | 2015-03-09 | 2015-06-17 | 山东大学 | Renewable energy source cooling, heating and power microgrid system and control method |
-
2015
- 2015-09-06 CN CN201510558242.7A patent/CN105207271B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354974A (en) * | 2011-10-13 | 2012-02-15 | 山东大学 | Micro-grid multi-objective optimized operation control method |
| CN102882206A (en) * | 2012-08-28 | 2013-01-16 | 中国电力科学研究院 | Multilevel micro-electric network control method based on four-dimensional energy management space |
| CN104197763A (en) * | 2014-09-11 | 2014-12-10 | 南京圣诺热管有限公司 | Automatic control based heat storage type waste heat recovery device and method |
| CN104716644A (en) * | 2015-03-09 | 2015-06-17 | 山东大学 | Renewable energy source cooling, heating and power microgrid system and control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105207271A (en) | 2015-12-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DK178459B1 (en) | System og fremgangsmåde til spændingsstyring af vindgeneratorer | |
| CN102619580B (en) | Method and system for controlling one-time frequency modulation | |
| CN103187789B (en) | Quick uninterruptible power system and control method thereof | |
| CN103401259B (en) | A kind of energy-storage system seamless switching control method | |
| CN105470995B (en) | A kind of double frequency shore electric power simultaneous interconnecting and power smooth transfer method | |
| CN106026195B (en) | Control method for synchronous closing and grid connection of micro-grid group | |
| CN104362665B (en) | Microgrid on-grid to off-grid switching control system and control method thereof | |
| CN105720606B (en) | A kind of control method of active power distribution network unperturbed cyclization for active power distribution network | |
| US9419439B2 (en) | Reconnecting a wind power plant to a utility grid | |
| CN108011378B (en) | Receiving end layered access extra-high voltage direct current low-load reactive power control method and control device | |
| CN105207271B (en) | A kind of method of lonely net and grid-connect mode seamless switching in cold, heat and power triple supply system | |
| WO2013020482A2 (en) | Coordination and control method for main and secondary parts of generator excitation system | |
| CN106169752B (en) | Main power source flexible switching method under a kind of micro-capacitance sensor off-network mode | |
| CN110061529B (en) | Smooth switching control method of flexible multi-state switch | |
| CN104124689B (en) | For the flexible direct current active power controller method of hybrid AC/DC power transmission systems | |
| WO2022237251A1 (en) | Decoupling voltage regulation-based distribution network loop closing and opening device and method, and power distribution network | |
| CN102222937A (en) | Photovoltaic grid-connected inverter and grid-connected control method thereof | |
| CN105140948A (en) | Flexible direct current transmission system power coordination control method | |
| CN111564896A (en) | Smooth switching and flexible exiting method and device for voltage sag treatment device | |
| CN110112787A (en) | Light based on virtual synchronous generator stores up micro-grid connection presynchronization control method | |
| CN104078983A (en) | Reactive distribution optimizing method for reducing active loss of wind power farm | |
| CN104578084A (en) | Dynamic reactive compensating mechanism and AVC (Automatic Voltage Control) combined control system | |
| CN103595052A (en) | Method for stably controlling switchover from micro-grid connection into island state | |
| CN107069777B (en) | Device and method for preventing starting impact current based on micro-grid island operation | |
| CN107528349A (en) | Thermal power generation unit load gearshift adjustment control method and system based on new energy load |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Nong Jing Inventor after: Liu Wenxia Inventor after: Ding Jian Inventor after: Zhong Lianhong Inventor after: Zhang Wenjing Inventor after: Liu Qiang Inventor after: Li Qingsheng Inventor after: Ma Chunlei Inventor after: Tang Xueyong Inventor after: Zhang Yu Inventor after: Wu Jinhui Inventor after: Xi Zhijiang Inventor before: Nong Jing Inventor before: Zhang Wenjing Inventor before: Zhong Lianhong Inventor before: Wu Jinhui Inventor before: Li Qingsheng Inventor before: Xi Zhijiang Inventor before: Tang Xueyong Inventor before: Zhang Yu Inventor before: Liu Wenxia |