CN113032377A - Independent micro-grid operation control method formed by energy storage and micro gas turbine - Google Patents
Independent micro-grid operation control method formed by energy storage and micro gas turbine Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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Abstract
The invention belongs to the field of electric power systems, in particular to an independent microgrid operation control method consisting of energy storage and a micro gas turbine, which aims at the problems that the existing domestic micro gas turbine technology is not mature enough, a plurality of control capabilities are not complete yet, and other functions are basically unavailable except basic power generation capability, and the following scheme is proposed, which comprises the following steps: s1, data acquisition, wherein the data acquisition of the micro-grid system comprises energy storage system power data, battery state data and outlet line power data of the micro gas turbine; s2, a control system of the energy storage system, wherein the energy storage system is controlled by a PLC and is only used for carrying out frequency adjustment on the microgrid, and the invention expands the selection range of the power supply in the microgrid, so that the domestic micro gas turbine has market space participating in the isolated network type microgrid, the response time of the microgrid is extremely short, and the reliability of the power supply during the isolated network operation is greatly improved; the remote control capability is provided, and the automation degree is high.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to an independent micro-grid operation control method consisting of energy storage and a micro gas turbine.
Background
Under the large background of carbon peak reaching and carbon neutralization, the use of low-carbon energy is the trend of human society development, and natural gas is a specific measure for replacing diesel oil to generate electricity. The use of gas turbine power in situations where temporary power utilization or power reliability requirements are high in the field is an emerging solution. For a long time, the market and the technology of the gas turbine are held in a few enterprises in Europe and America, the technology of the domestic gas turbine is immature, and a plurality of automatic control functions and other conventional control functions of the generator set are not available.
From the research of the micro-grid stable operation control technology of the current micro gas turbine, the characteristics of the domestic gas turbine cannot be fully considered mostly based on the mature imported gas turbine and the complete self control technology thereof, and a mature control system corresponding to the domestic gas turbine is not used.
When the gas turbine is applied to the micro-grid market at present, the gas turbine is required to have strong system regulation capacity, and the gas turbine meeting the requirements is basically an imported gas turbine. A control system that requires as few as possible gas turbines with multiple self-regulating capabilities for use in a microgrid system is desirable.
In the existing isolated grid type micro-grid containing a gas turbine, a diesel generator is generally adopted as a main voltage source or even a main power source, the technology is mature, the reliability is high, but the defects are that the carbon emission is high, and the environment is not friendly. Under the large background of carbon peaking and carbon neutralization, it is necessary to develop a more friendly and reliable technology for replacing diesel generators. Domestic replacement of the gas turbine is also necessary, but the technology of the domestic micro gas turbine is not mature enough, a lot of control capacity is not complete, and other functions except the basic power generation capacity are basically not available.
Disclosure of Invention
The invention aims to solve the defects that the technology of a domestic micro gas turbine is not mature enough, a plurality of control capabilities are not complete enough, and other functions are basically not available except the basic power generation capability in the prior art, and provides an independent micro-grid operation control method consisting of energy storage and a micro gas turbine.
In order to achieve the purpose, the invention adopts the following technical scheme:
an independent micro-grid operation control method composed of an energy storage and a micro gas turbine comprises the following steps:
s1, data acquisition, wherein the data acquisition of the micro-grid system comprises energy storage system power data, battery state data and outlet line power data of the micro gas turbine;
s2, a control system of the energy storage system, wherein the energy storage system is controlled by a PLC and is only used for carrying out frequency adjustment on the microgrid, namely, the power bus frequency value collected by a frequency transmitter is obtained, and the active power required to be output by the energy storage system is calculated according to the deviation of the real-time frequency and the power frequency;
s3, system frequency adjustment control, namely setting a certain frequency adjustment dead zone e according to the frequency range of load work in the microgrid system to avoid frequent adjustment of the energy storage system, wherein in order to ensure that the energy storage system has long-term upward and downward adjustment capability, the reasonable SOC value interval of the energy storage system is about 50 +/-20%;
s4, cutting off the micro gas turbine control method: when the frequency regulation control needs the charging of the energy storage system and the target value of the active power reaches or exceeds the rated power, a control instruction for cutting off the micro gas turbine needs to be executed;
s5, load shedding control method: when the frequency regulation control requires the energy storage system to discharge and the active power target value reaches or exceeds the rated power, a control instruction for cutting off the controllable load needs to be executed.
Preferably, in S1, the data acquisition: the data acquisition of the micro-grid system comprises energy storage system power data, battery state data and outlet wire power data of the micro gas turbine, the data are completed through a common data acquisition sensor, and the power bus frequency data are completed through a frequency transmitter.
Preferably, in S3, the droop control is adopted to realize frequency adjustment, and the active power target value calculation equation is:
Pn＝P0+Δf/δ
in the formula: pnRepresenting the active power target value, P, of the energy storage system0The real-time value of the current active power of the energy storage system is represented, deltaf represents the deviation between the real-time frequency and the power frequency, delta represents the unequal rate of the rotating speed, the value range is 0.5-20%, the specific fixed value of delta is debugged according to the capacity of the actual system on site, and the debugging target is as follows: when the system load disturbance causes the bus frequency to cross the dead zone, the energy storage system acts to enable the lowest sensitivity value of the energy storage converter to enable the system frequency to return to a normal interval.
Preferably, in S4, the amount of power of the micro gas turbine to be cut off is:
N＝ΔP/P
in the formula: and delta P represents the part of the active power target value of the energy storage system exceeding the rated power of the energy storage system, and P represents the rated power of the micro gas turbine. And the value of N is rounded by adopting a 'one-in-one method'.
Preferably, in S5, the number of removed loads is N: n is such that P is satisfiedN＞|Pn|-PBWherein P isNRepresenting the sum of the real-time loads, P, of N controllable devicesnRepresenting the active power target value, P, of the energy storage systemBIndicating energy storage system ratingAnd (4) discharging power.
Note that: when the capacity of the microgrid system is configured, the uncontrollable load capacity is smaller than the power of the energy storage system, otherwise, in order to ensure the stability of the microgrid system, strict load management is required, and the condition that the single input of the load does not exceed the power of the energy storage system is ensured.
Preferably, when the energy storage system is lower than the lower limit of the reasonable SOC interval, the energy storage SOC is considered to be negatively deviated, when the energy storage system is in a discharging state, the negative SOC deviation is aggravated, and the overall power of the micro gas turbine needs to be increased, so that the energy storage system is converted into a charging state, and the negative SOC deviation is reduced or eliminated.
Preferably, when the energy storage system is higher than the upper limit of the reasonable SOC interval, the energy storage SOC is considered to be deviating, and when the energy storage system is in the charging state, the SOC deviation is aggravated, and the overall power of the micro gas turbine needs to be reduced, so that the energy storage system is converted into the discharging state, and the SOC deviation is reduced or eliminated.
Preferably, in order to enable the energy storage system to have more margin in response to frequency control adjustment, when the load disturbance is small, the control system should adjust the total power of the micro gas turbine, so as to reduce the absolute power of the energy storage system, and enable the load of the micro grid system to be borne by the main power supply.
Compared with the prior art, the invention has the beneficial effects that:
the control system has lower control requirements on the gas turbine, only needs to respond to an active power instruction, and expands the selection range of a power supply in the microgrid, so that the domestic micro gas turbine has market space participating in the isolated microgrid; the response time of the micro-grid is extremely short, and the reliability of a power supply in isolated grid operation is greatly improved; the remote control capability is realized, and the automation degree is high;
the quick response capability of the energy storage system is utilized to make up the defect of low response speed of the gas turbine unit, the energy storage system passively responds to the frequency fluctuation of the microgrid system, the gas turbine is actively controlled to adjust the power and the electric quantity of the energy storage system, and the microgrid is higher in reliability and more stable in operation due to respective control.
Drawings
Fig. 1 is a structural diagram of a microgrid system of an independent microgrid operation control method consisting of an energy storage and a micro gas turbine.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1, a method for controlling the operation of an independent microgrid consisting of an energy storage and a micro gas turbine includes the following steps:
s1, data acquisition, wherein the data acquisition of the micro-grid system comprises energy storage system power data, battery state data and outlet line power data of the micro gas turbine;
s2, a control system of the energy storage system: the energy storage system is controlled by a PLC and is only used for carrying out frequency adjustment on the microgrid, namely a power bus frequency value acquired by a frequency transmitter is obtained, and the active power required to be output by the energy storage system is calculated according to the deviation of real-time frequency and power frequency;
s3, system frequency adjustment control: according to the frequency range of load working in the micro-grid system, a certain frequency regulation dead zone e is set to avoid frequent regulation of the energy storage system, and in order to ensure that the energy storage system has long-term upward and downward regulation capacity, the reasonable SOC value interval of the energy storage system is about 50 +/-20%; the SOC value refers to the battery state of charge.
S4, cutting off the micro gas turbine control method: when the frequency regulation control needs the charging of the energy storage system and the target value of the active power reaches or exceeds the rated power, a control instruction for cutting off the micro gas turbine needs to be executed;
s5, load shedding control method: when the frequency regulation control requires the energy storage system to discharge and the active power target value reaches or exceeds the rated power, a control instruction for cutting off the controllable load needs to be executed.
In the present invention, in S1, data acquisition: the data acquisition of the micro-grid system comprises energy storage system power data, battery state data and outlet wire power data of the micro gas turbine, the data are completed through a common data acquisition sensor, and the power bus frequency data are completed through a frequency transmitter.
In the invention, in S3, droop control is adopted to realize frequency adjustment, and the active power target value calculation equation is:
Pn＝P0+Δf/δ
in the formula: pnRepresenting the active power target value, P, of the energy storage system0The real-time value of the current active power of the energy storage system is represented, deltaf represents the deviation between the real-time frequency and the power frequency, delta represents the unequal rate of the rotating speed, the value range is 0.5-20%, the specific fixed value of delta is debugged according to the capacity of the actual system on site, and the debugging target is as follows: when the system load disturbance causes the bus frequency to cross the dead zone, the energy storage system acts to enable the lowest sensitivity value of the energy storage converter to enable the system frequency to return to a normal interval.
In the present invention, in S4, the amount of power of the micro gas turbine to be cut off is:
N＝ΔP/P
in the formula: and delta P represents the part of the active power target value of the energy storage system exceeding the rated power of the energy storage system, and P represents the rated power of the micro gas turbine. And the value of N is rounded by adopting a 'one-in-one method'.
In the present invention, in S5, the number of loads to be removed is N: n is such that P is satisfiedN＞|Pn|-PBWherein P isNRepresenting the sum of the real-time loads, P, of N controllable devicesnRepresenting the active power target value, P, of the energy storage systemBIndicating the rated discharge power of the energy storage system.
Note that: when the capacity of the microgrid system is configured, the uncontrollable load capacity is smaller than the power of the energy storage system, otherwise, in order to ensure the stability of the microgrid system, strict load management is required, and the condition that the single input of the load does not exceed the power of the energy storage system is ensured.
In the invention, when the energy storage system is lower than the lower limit of the reasonable SOC interval, the energy storage SOC is considered to be negatively deviated, and when the energy storage system is in a discharging state, the SOC negative deviation is aggravated, and the whole power of the micro gas turbine needs to be increased, so that the energy storage system is converted into a charging state, and the SOC negative deviation is reduced or eliminated.
In the invention, when the energy storage system is higher than the upper limit of the reasonable SOC interval, the energy storage SOC is considered to be deviated positively, and when the energy storage system is in a charging state, the positive deviation of the SOC is aggravated, and the overall power of the micro gas turbine needs to be reduced, so that the energy storage system is converted into a discharging state, and the positive deviation of the SOC is reduced or eliminated.
In the invention, in order to enable the energy storage system to have more margin when responding to frequency control and regulation, when the load disturbance is smaller, the control system should adjust the total power of the micro gas turbine, so as to reduce the absolute power of the energy storage system, and enable the load of the micro power grid system to be borne by a main power supply.
In the micro-grid system, a power supply comprises a set of energy storage system and a plurality of micro gas turbines, the energy storage system is connected with a power bus through an energy storage converter, and all the micro gas turbines are directly connected to the power bus. The main load is connected into a power bus through a transformer, and the power bus is also connected with a self-power feeder and an automatic reactive power compensator; the micro-grid control system comprises a central controller, a frequency transmitter, a PLC and a sub-controller, wherein the acquisition end of the frequency transmitter is connected to a power bus, the signal of the frequency transmitter is disconnected and connected to one input end of the PLC, one input end of the central controller is connected to the PLC, and one output end of the PLC is connected to the energy storage converter. The central controller is in communication connection with each sub-controller through a high-speed industrial Ethernet bus, and each sub-controller is connected with a control system of the micro gas turbine. In addition, the micro-grid system also comprises a plurality of data acquisition modules, wherein the acquisition ends of the data acquisition modules are connected to one side of each branch circuit breaker of the micro-grid, and the signal ends of the data acquisition modules are connected to the central controller.
In the invention, a plurality of micro gas turbines with the same specification are connected in parallel, an energy storage system is exemplified by two PCS connected in parallel, the peak load is the same as the rated total power of the micro gas turbines, the maximum load power of a single device is the same as the rated total power of the energy storage system, and a micro-grid system is exemplified to illustrate the specific method of the invention, wherein the system is shown as attached figure 1.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. An independent microgrid operation control method formed by energy storage and a micro gas turbine is characterized by comprising the following steps:
s1, data acquisition, wherein the data acquisition of the micro-grid system comprises energy storage system power data, battery state data and outlet line power data of the micro gas turbine;
s2, a control system of the energy storage system, wherein the energy storage system is controlled by a PLC and is only used for carrying out frequency adjustment on the microgrid, namely, the power bus frequency value collected by a frequency transmitter is obtained, and the active power required to be output by the energy storage system is calculated according to the deviation of the real-time frequency and the power frequency;
s3, system frequency adjustment control, namely setting a certain frequency adjustment dead zone e according to the frequency range of load work in the microgrid system to avoid frequent adjustment of the energy storage system, wherein in order to ensure that the energy storage system has long-term upward and downward adjustment capability, the reasonable SOC value interval of the energy storage system is about 50 +/-20%;
s4, cutting off the micro gas turbine control method: when the frequency regulation control needs the charging of the energy storage system and the target value of the active power reaches or exceeds the rated power, a control instruction for cutting off the micro gas turbine needs to be executed;
s5, load shedding control method: when the frequency regulation control requires the energy storage system to discharge and the active power target value reaches or exceeds the rated power, a control instruction for cutting off the controllable load needs to be executed.
2. The method for controlling the operation of the independent microgrid consisting of the energy storage and the micro gas turbine is characterized in that in S1, data acquisition of the microgrid system comprises energy storage system power data, battery state data and outlet line power data of the micro gas turbine, the data acquisition is completed through a common data acquisition sensor, and power bus frequency data is completed through a frequency transmitter.
3. The method of claim 1, wherein in step S3, the droop control is used to adjust the frequency, and the active power target value calculation equation is:
Pn＝P0+Δf/δ
in the formula: pnRepresenting the active power target value, P, of the energy storage system0The real-time value of the current active power of the energy storage system is represented, deltaf represents the deviation between the real-time frequency and the power frequency, delta represents the unequal rate of the rotating speed, the value range is 0.5-20%, the specific fixed value of delta is debugged according to the capacity of the actual system on site, and the debugging target is as follows: when the system load disturbance causes the bus frequency to cross the dead zone, the energy storage system acts to enable the lowest sensitivity value of the energy storage converter to enable the system frequency to return to a normal interval.
4. The method for controlling the operation of an independent microgrid consisting of energy storage and micro gas turbines as claimed in claim 1, wherein in the step S4, the amount of power cut off from the micro gas turbines is:
N＝ΔP/P
in the formula: and delta P represents the part of the active power target value of the energy storage system exceeding the rated power of the energy storage system, and P represents the rated power of the micro gas turbine. And the value of N is rounded by adopting a 'one-in-one method'.
5. The method for controlling the operation of the independent microgrid consisting of the energy storage and the micro gas turbine as claimed in claim 1, wherein in step S5, the number of the removed loads is N: n is such that P is satisfiedN＞|Pn|-PBWherein P isNRepresenting the sum of the real-time loads, P, of N controllable devicesnRepresenting the active power target value, P, of the energy storage systemBIndicating the rated discharge power of the energy storage system.
Note that: when the capacity of the microgrid system is configured, the uncontrollable load capacity is smaller than the power of the energy storage system, otherwise, in order to ensure the stability of the microgrid system, strict load management is required, and the condition that the single input of the load does not exceed the power of the energy storage system is ensured.
6. The method as claimed in claim 1, wherein when the energy storage system is lower than the lower limit of the reasonable SOC interval, the SOC of the energy storage system is considered to be negatively deviated, and when the energy storage system is in a discharging state, the negative SOC deviation is aggravated, and the overall power of the micro gas turbine needs to be increased to convert the energy storage system to a charging state, so as to reduce or eliminate the negative SOC deviation.
7. The method as claimed in claim 1, wherein when the energy storage system is higher than the upper limit of the reasonable SOC interval, the SOC of the energy storage system is considered to be deviating, and when the energy storage system is in a charging state, the SOC deviation is aggravated, and the overall power of the micro gas turbine needs to be reduced, so that the energy storage system is converted into a discharging state to reduce or eliminate the SOC deviation.
8. The method as claimed in claim 1, wherein the control system adjusts the total power of the micro gas turbine to reduce the absolute power of the energy storage system when the load disturbance is small, so that the load of the micro grid system is borne by the main power source, in order to allow the energy storage system to have more margin in response to the frequency control adjustment.
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| CN114140176B (en) * | 2022-01-30 | 2022-04-26 | 国网浙江电动汽车服务有限公司 | Adjustable capacity prediction method and device for load aggregation platform |
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| CN113964850A (en) * | 2021-10-26 | 2022-01-21 | 西安热工研究院有限公司 | Coordination control system for enabling energy storage of power plant to participate in AGC (automatic gain control) frequency modulation of unit |
| CN114412647A (en) * | 2022-02-11 | 2022-04-29 | 北京理工大学 | Control method and system for double-shaft gas turbine hybrid power system |
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| Publication number | Publication date |
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| CN112765149B (en) | 2023-06-09 |
| CN112765149A (en) | 2021-05-07 |
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