CN212380954U - Natural gas distributed energy system with energy storage function - Google Patents
Natural gas distributed energy system with energy storage function Download PDFInfo
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- CN212380954U CN212380954U CN202020134657.8U CN202020134657U CN212380954U CN 212380954 U CN212380954 U CN 212380954U CN 202020134657 U CN202020134657 U CN 202020134657U CN 212380954 U CN212380954 U CN 212380954U
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Abstract
The utility model discloses a natural gas distributed energy system of area energy storage, internal-combustion engine, generator and little electric wire netting including interconnect still have the power battery group in parallel between generator and little electric wire netting. The system can effectively cope with the load fluctuation of the energy application end. If the power consumption of the energy consumption end is reduced, the generator can store redundant electric energy by the power battery pack, and when the power consumption of the energy consumption end is increased, insufficient electric energy is output and compensated by the power battery pack. The internal combustion engine and the generator are kept in the optimal energy efficiency interval to operate as far as possible in the whole process, and the power battery pack is responsible for carrying out peak clipping and valley filling on power utilization requirements. The energy efficiency of the system is improved, the fuel consumed by unit generating capacity is reduced, meanwhile, the installed capacity of the internal combustion engine can be relatively reduced, the pollutant emission of the unit is reduced in the total amount, and the whole system is more economical and more environment-friendly to operate.
Description
Technical Field
The utility model belongs to the technical field of the internal-combustion engine electricity generation, concretely relates to natural gas distributed energy system of area energy storage.
Background
The distributed internal combustion engine generator set is widely applied to various different places such as commercial complexes, data centers, schools, office buildings, hospitals, hotels and the like, and provides energy requirements such as required electric energy, heat energy and the like for the commercial complexes, the data centers, the schools, the office buildings, the hospitals, the hotels and the like. In the internal combustion engine distributed generator set in actual use, most of the energy demands of various places are discontinuous, and taking the electric energy demand of schools as an example, the electric energy demand is more in the daytime generally, but the electric energy demand is greatly reduced at night, especially after most of people fall asleep in the school. However, the operation of the internal combustion engine generator set is kept continuous, which creates the contradiction that the power generation end is continuous but the energy utilization end is discontinuous.
In order to solve the above problems, the conventional solution at present is to adjust the operation condition of the internal combustion engine generator set from the operation under the condition that the power consumption may reach 90% or even 100% during the peak time of the day to the operation under the condition that the power consumption may be less than 40%.
However, since the internal combustion engine generator set is adjusted to operate in a narrow optimal energy efficiency interval, when the operation condition exceeds or falls below the optimal energy efficiency interval, the efficiency of the internal combustion engine generator set is reduced, which causes the internal combustion engine generator set to consume more fuel (usually natural gas), and reduces the economy of the internal combustion engine generator set.
Disclosure of Invention
To the defect or not enough that above-mentioned prior art exists, the utility model aims to provide a natural gas distributed energy system of taking energy storage.
In order to realize the task, the utility model discloses take following technical solution:
a natural gas distributed energy system with energy storage function comprises an internal combustion engine, a generator and a microgrid which are connected with each other, and is characterized in that a power battery pack is further connected in parallel between the generator and the microgrid.
The utility model has the other characteristics that the internal-combustion engine is formed by connecting a plurality of low-power internal-combustion engines in parallel.
The utility model discloses a natural gas distributed energy system of area energy storage can effectively deal with the load fluctuation of ability end. If the power consumption of the energy consumption end is reduced, the generator can store redundant electric energy by the power battery pack, and when the power consumption of the energy consumption end is increased, insufficient electric energy is output and compensated by the power battery pack. The internal combustion engine and the generator are kept in the optimal energy efficiency interval to operate as far as possible in the whole process, and the power battery pack is responsible for carrying out peak clipping and valley filling on power utilization requirements. The energy efficiency of the system is improved, the fuel consumed by unit generating capacity is reduced, meanwhile, the installed capacity of the internal combustion engine can be relatively reduced, the pollutant emission of the unit is reduced in the total amount, and the whole system is more economical and more environment-friendly to operate.
Drawings
Fig. 1 is a structural block diagram of a natural gas distributed energy system with energy storage according to the present invention;
fig. 2 is a working principle diagram of the natural gas distributed energy system with energy storage of the present invention, in which 1 represents an output curve of a power battery, and 2 represents an output curve of an internal combustion engine;
FIG. 3 is a block diagram showing the structure of a specific experimental example 1;
FIG. 4 is a block diagram showing the structure of another specific example 2;
fig. 5 is an electrical schematic diagram of the natural gas distributed energy system with energy storage of the present invention;
fig. 6 is a control logic diagram of the natural gas distributed energy system with energy storage according to the present invention;
the invention is described in further detail below with reference to the figures and specific examples.
Detailed Description
Example 1:
referring to fig. 1, the embodiment provides a natural gas distributed energy system with energy storage, which includes an internal combustion engine, a generator and a microgrid connected with each other, and a power battery pack is connected in parallel between the generator and the microgrid.
The natural gas distributed energy system with the energy storage function is characterized in that a power battery pack serving as an energy storage medium and a generator set are connected in parallel for use, and the working principle of the natural gas distributed energy system is shown in fig. 2. In the figure, 1 indicates a power battery output curve, and 2 indicates an internal combustion engine output curve. Once the internal combustion engine is started, the load power is tracked in a relatively economic area, and when the load power is larger or smaller than the power which can be output by the economic area of the internal combustion engine, the power battery pack can buffer and compensate the power difference through charging and discharging. The circulating loss of electric energy can be reduced, the heavy current discharge of a power battery pack and the frequent starting of an internal combustion engine are avoided, the fuel consumption is reduced, and the emission performance is improved. So that the overall efficiency is highest. The technical principle of the hybrid vehicle is consistent with that of the hybrid vehicle.
The applicant uses the natural gas distributed energy system with energy storage of the embodiment on the drum-Shaanxi energy interconnection island, and the obtained economic benefits are shown in the following table:
experimental comparative example 1:
as shown in fig. 3, the applicant carried out the following experiment, which adopts the technical scheme: the utility model provides a natural gas distributed energy system of area energy storage, includes interconnect's internal-combustion engine and generator, still is connected with the power battery group on the generator, and this power battery group is connected with the microgrid.
Experiments show that in the technical scheme, the micro-grid can only obtain electric energy from the power battery pack, the power battery pack must meet the requirements of all instantaneous powers, the fluctuation of the discharge current of the power battery pack is large, and the power battery pack has the condition of large-current discharge, so that the discharge efficiency and the service life of the power battery pack are adversely affected; secondly, although the internal combustion engine can work at the optimal efficiency point, the efficiency loss of charging and discharging of the power battery pack is probably greater than the benefit of the internal combustion engine after optimization due to the addition of energy conversion links. The technical scheme has the defects of being beneficial to an internal combustion engine and being unfavorable to a power battery pack, and is similar to the technical principle of increasing the range of a Takrus electric vehicle.
Experimental comparative example 2:
as shown in fig. 4, the technical scheme adopted in the experiment is as follows: a natural gas distributed energy system with energy storage function comprises an internal combustion engine and a generator which are connected with each other, wherein the generator is connected with a micro-grid, and a power battery pack is connected to the micro-grid.
The technical scheme can be applied to the current energy storage field, can work in a pure electric mode, can benefit by using peak-valley price difference, and is limited by geographical positions. The technical scheme reduces the charge-discharge circulation of the power battery pack, and the power loss related to charge and discharge is correspondingly reduced.
However, it has been found experimentally that frequent start-stops of the internal combustion engine result, affecting the efficiency and emission characteristics of the internal combustion engine, since all power requirements of the energy end must be met and a quick response is to be made. This solution is therefore advantageous for the power battery and disadvantageous for the internal combustion engine. Under the same working condition, the energy-saving effect is better than that of the alternative 1, and is about between 8 and 10 percent. Similar to the technical principle of a plug-in hybrid vehicle.
Experimental comparative example 3:
in the experiment, a single internal combustion engine generator set is split into a parallel connection mode of a plurality of low-power generator sets. When the change of the power demand at the energy end is large, the change of the whole output power is realized by switching part of the small units, and the scheme can be applied in the market, but the investment is increased compared with the embodiment 1.
Fig. 5 shows an electrical schematic diagram of the natural gas distributed energy system with energy storage according to embodiment 1, which includes an internal combustion generator set composed of an internal combustion engine and a generator, an energy storage (power) battery pack, a charging controller, a DSP controller, a rectifier, an inverter, and the like, and provides power to a load end together with a mains supply line. The gas source is connected with a pressure reducing valve, the pressure reducing valve is connected with the internal combustion generator set, the internal combustion generator set is connected with an isolation diode, the isolation diode is connected with a DC/AC inverter, the DC/AC inverter is connected with a charging controller, and the charging controller is connected with the energy storage battery pack; the commercial power is connected with a charging controller through a KM1-T1 relay, and the charging controller is connected with an energy storage battery pack; the DSP controller is connected with the DC/DC, and the DC/DC is connected with the energy storage battery pack; the output end of the energy storage battery pack is connected with a load through a KM1-T2 relay. During normal work, the natural gas distributed energy system with the energy storage supplies power to the load end and carries out self-output adjustment according to the load condition of the load end, and at the moment, the commercial power is disconnected. And if the natural gas distributed energy system with the energy storage is stopped or started, the commercial power is started, and the energy storage battery pack is charged and discharged according to the condition.
Fig. 6 is a control logic diagram of the natural gas distributed energy system with energy storage according to embodiment 1, where the control logic is divided into the following four conditions:
1. starting condition
The controller receives a starting button input instruction, starts the driving motor, and the energy storage (power) battery pack supplies power to the driving motor to start the unit in a pure electric mode; when the required power is higher than the set value, the internal combustion engine is started by the controller (when the controller gives an internal combustion engine starting signal, the energy storage battery pack supplies energy to the generator, the controller starts the generator, and the generator is used for reversely dragging the internal combustion engine to start). The method can avoid the defects of high oil consumption and high emission when the internal combustion engine is started.
2. Normal working condition
(ii) series mode
When the internal combustion engine set is operating normally, the internal combustion engine set is operated in series mode due to low load on the customer side and low emissions requirements. Considering that the energy storage (power) battery pack operates less efficiently at both low (state of charge) and high SOC when the internal combustion engine operates in a low-speed low-torque or high-speed low-torque region, a logic threshold control method is generally employed.
In the series mode, the internal combustion engine works in an optimal working area to provide energy for the driving motor, and the energy storage (power) battery pack mainly plays a role in peak clipping and valley filling for the energy in the process, and the basic control strategy is as follows:
a. SOCmin < SOC < SOCmax, where Me is Mv + Mc if Me > Mv, and Me + Md is Mv if Me < Mv;
b. if SOC is less than SOCmin, then Me is Mv + Mc;
c. SOC is less than SOCmax, a pure electric mode is started, and the internal combustion engine is closed;
d. SOC < SOC1, the engine is started.
In the formula, Me is the working torque of the internal combustion engine; mv is the required driving moment obtained by the user side feeding back to the controller; mc is the moment for charging the energy storage battery pack; md is driving torque provided for the motor by discharging of an energy storage (power) battery pack; SOC1 is when the engine starts when the SOC is below this value; SOCmin is used for charging the energy storage battery pack when the SOC is lower than the value; SOCmin < SOC1< SOCmax.
② parallel mode
When the internal combustion generator set has higher load requirements, if the rotating speed and the output power need to be rapidly increased, the requirement cannot be met by the single drive of the motor, so that the mode is changed into a parallel mode, and the basic control strategy is as follows:
a. SOC > SOCmin, Me < Mv if Me > Mv, Me ═ Mv + Mc, Me ═ Mv;
soc > SOCmin, if Me > Mv, Me ═ Mv + Mc; then Me < Mv, Me + Md ═ Mv.
3. Deceleration regime
When the internal combustion generator set needs to reduce the output power, the controller sends a negative torque signal to the driving motor, so that the driving motor is in a reverse-dragging power generation state, and electric energy is fed back to the energy storage (power) battery pack. The motor torque is determined by the maximum charging torque of the motor and the charging state of the energy storage (power) battery pack.
When the braking is recovered and the charging is carried out, the mechanical braking system starts to work, when the demand of the load on the power is lower than a set value or the rotating speed of the motor is lower than a set value, the charging efficiency of the motor is lower at the moment, the energy recovery system is not started, the mechanical braking is directly adopted, and the basic control strategy is as follows:
a. mb > Mc, if SOC < SOCmax, Mb ═ Mc; if SOC is larger than or equal to SOCmax, Mm is defined as the stop of the motor.
Mb > Mc, if SOC < SOCmax, Mb is Mc + Mm; if SOC is larger than or equal to SOCmax, Mm is defined as the stop of the motor.
In the formula, Mb is the braking torque required by the internal combustion generator set; mm is the mechanical friction braking torque.
4. Fault condition
When the motor fails, the motor is driven in a pure internal combustion engine mode; when the internal combustion engine has a fault, the internal combustion engine is operated in a pure electric mode.
Theoretical calculation proves that the natural gas distributed energy system with the energy storage function, provided by the embodiment 1, has very obvious economical efficiency on the drum-Shaanxi energy interconnection island, and can improve the return on investment of a distributed internal combustion engine generator set by 30%.
Claims (1)
1. A natural gas distributed energy system with energy storage comprises an internal combustion engine, a generator and a microgrid which are connected with each other, and is characterized in that a power battery pack is also connected in parallel between the generator and the microgrid; the gas source is connected with a pressure reducing valve, the pressure reducing valve is connected with the internal combustion generator set, the internal combustion generator set is connected with an isolation diode, the isolation diode is connected with a DC/AC inverter, the DC/AC inverter is connected with a charging controller, and the charging controller is connected with the energy storage battery pack; the commercial power is connected with a charging controller through a KM1-T1 relay, and the charging controller is connected with an energy storage battery pack; the DSP controller is connected with the DC/DC, and the DC/DC is connected with the energy storage battery pack; the output end of the energy storage battery pack is connected with a load through a KM1-T2 relay;
the power consumption of the energy consumption end is reduced, the generator can store redundant electric energy by means of the power battery pack, when the power consumption of the energy consumption end is increased, insufficient electric energy is output and compensated by the power battery pack, the internal combustion engine and the generator are kept in an optimal energy efficiency interval to operate in the whole process, and the power battery pack is responsible for peak clipping and valley filling of power consumption requirements;
the internal combustion engine is formed by connecting a plurality of low-power internal combustion engines in parallel.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117052529A (en) * | 2023-08-18 | 2023-11-14 | 北京博威能源科技股份有限公司 | Gas and energy storage combined complementary generator set |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117052529A (en) * | 2023-08-18 | 2023-11-14 | 北京博威能源科技股份有限公司 | Gas and energy storage combined complementary generator set |
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