CN104779633A - Power compensation and energy recovery device for gas power generation system - Google Patents
Power compensation and energy recovery device for gas power generation system Download PDFInfo
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Abstract
The invention discloses a power compensation and energy recovery device for a gas power generation system. The power compensation and energy recovery device comprises a super capacitor energy storage module, a two-way DC/DC converter, an energy management system, a detection unit and a fluctuation stabilizing device, wherein the super capacitor energy storage module is connected with a middle DC bus of a converter of the power generation system through the two-way DC/DC converter, the detection unit detects voltage and current states of the power generation system and the super capacitor energy storage module and transmits information to the energy management system, the energy management system controls the operation of the two-way DC/DC converter through calculation and analysis so as to control energy exchange between the energy storage module and the power generation system, corresponding energy is absorbed or released as required during load fluctuation, the power fluctuation is stabilized, the power of the power generation system is adjusted to be balanced, and safe and stable operation of the system is guaranteed; besides, the energy utilization rate is effectively increased due to absorption and utilization of regenerated energy produced by load brake.
Description
Technical field
The invention belongs to electric and field of dynamic engineering, relate to a kind of gas power generation system power back-off and energy recycle device.
Background technology
Current a lot of occasion all adopts oil-fired power generating unit to power, and traditional oil-fired power generating system discharge is seriously polluted and fuel cost is very high; As a kind of clean fuel, combustion gas has pollutes the advantage little, cost is low, it is relative to oil-fired power generating, fuel gas generation can reduce carbon dioxide and oxynitride discharge more than 50%, and cost only has the half of oil-fired power generating, generate electricity as the energy according to combustion gas, generation environment-friendly and economy will be improved greatly.But because jet dynamic control mechanical property is softer; resistance to overload shock is poor; be not enough to when load fluctuation is larger provide or absorb sufficiently high power; bus frequency and voltage generation cataclysm can be caused so that shut down; and many loads such as oil exploitation equipment, hoisting equipment, steel rolling equipment, pit gear operationally power fluctuation is often very large; under this operating mode, electricity generation system voltage fluctuation is very large, is easy to cause jet dynamic control to shut down even generation accident.If can adopt a kind of extra power compensating device and gas electricity generator with the use of, when load power fluctuates, Quick supplies or absorbs energy, the dynamic equilibrium of adjustment electricity generation system power, can the even running of safeguards system, makes the spread of " oil to gas generating " become possibility.
In addition the load of the type such as hoisting machinery, mine machinery, traffic apparatus slowing down, braking or reversion time be in generator operation state, regenerated energy can be produced and feed back to electric power system, if eliminate not in time, electric power system voltage can be caused to raise, also electricity generation system can be caused to shut down even accidents caused, hinder system cloud gray model; So the normal brake resistance that adopts is consumed at present.If can manage, this part feedback energy is absorbed, will greatly improve the effective rate of utilization of the energy, have good effects of energy saving and emission reduction.
Summary of the invention
The object of the invention is to overcome prior art defect, a kind of gas power generation system power back-off and energy recycle device are provided, can discharge or absorb a large amount of energy when load changes suddenly in short-term, provide that power cushions, the stable operation of safeguards system.
For achieving the above object, the present invention by the following technical solutions:
A kind of gas power generation system power back-off and energy recycle device, comprise ultracapacitor energy storage module, two-way DC/DC converter, EMS, detecting unit peace wave apparatus; Super capacitor energy-storage module is connected with the converter plant intermediate dc bus of electricity generation system by two-way DC/DC converter, flat wave apparatus is connected between the converter plant intermediate dc bus of two-way DC/DC converter and electricity generation system, for eliminating spike in energy exchange processes; Detecting unit is connected to converter plant intermediate dc bus and ultracapacitor energy storage module two ends respectively, and detection signal is passed to EMS, EMS is connected with the electronic power switch in DC/DC converter, by computational analysis electricity generation system voltage, current parameters, control the operation of two-way DC/DC converter, thus control the energy exchange between super capacitor energy-storage mould and electricity generation system.
Further, described two-way DC/DC transformer configuration is two-way step down/boost chopper, is externally released energy by ultracapacitor energy storage module when boost chopper state, charges to ultracapacitor energy storage module when buck chopper state.
Further, described EMS is compared and analytical calculation by the command voltage to the electricity generation system gathered and the voltage of ultracapacitor energy storage module, current signal and systemic presupposition, current signal, thus sending pulse signal, in control DC/DC converter, electronic power switch opening or turning off.
Further, described ultracapacitor energy storage module is combined by the connection in series-parallel of multiple ultracapacitor monomer.
Further, described flat wave apparatus is made up of smoothing reactor Ld, diode D and discharge resistance Rd, and diode D and discharge resistance Rd is in parallel with smoothing reactor Ld after connecting.
Further, described two-way DC/DC converter comprises inductance L s, electric capacity Cs, electronic switch IGBT1, IGBT2 and storage capacitor Cd and forms, when booste operation, and IGBT2 action, IGBT1 ends, and converter is operated in boost state; When brownout operation, IGBT1 action, during IGBT2 cut-off, converter is operated in buck state.
The present invention adopt can absorb fast or discharge the Ultracapacitor Energy Storage of large energy and jet dynamic control grid-connected with the use of, can discharge or absorb a large amount of energy when load changes suddenly in short-term, the stable operation of power buffering, safeguards system is provided, and can the energy that load braking produces be recycled, energy efficient, improves the utilance of the energy effectively.
Energy storage module is connected on the intermediate dc bus of electricity generation system converter plant by two-way DC/DC converter, the input of detecting unit is connected to converter plant intermediate dc bus and ultracapacitor energy storage module two ends respectively, and detection signal is passed to EMS, EMS judges by carrying out analysis to electricity generation system state, control the operation of two-way DC/DC converter, thus control the exchange of energy between energy storage module and electricity generation system.Exchanged by real-time power, make ultracapacitor energy storage module system for tracking running status absorb or release energy, regulate the power-balance of electricity generation system, thus the stable operation of safeguards system.
Further, ultracapacitor energy storage module is combined according to energy reserve demand, power demand and the connection in series-parallel of electric pressure demand by multiple ultracapacitor monomer, it has that capacitance is large, power density is high, can the feature such as long, non-maintaining, the economic environmental protection of big current fast charging and discharging, service life cycle, can absorb or discharge large energy fast.
Accompanying drawing explanation
Fig. 1 is structure chart of the present invention;
Fig. 2 is embodiment of the present invention structure chart;
Fig. 3 is the oscillogram that specific embodiment one does not drop into device of the present invention;
Fig. 4 is the oscillogram that specific embodiment one drops into device of the present invention;
Fig. 5 is the oscillogram that specific embodiment two does not drop into device of the present invention;
Fig. 6 is the oscillogram that specific embodiment two drops into device of the present invention;
Embodiment
Describe the present invention below in conjunction with accompanying drawing:
Circuit structure of the present invention as shown in Figure 1, comprises ultracapacitor energy storage module, two-way DC/DC converter, detecting unit, EMS, flat wave apparatus composition.Ultracapacitor energy storage module is formed according to energy reserve demand and the connection in series-parallel of electric pressure demand by multiple ultracapacitor monomer, it has that capacitance is large, power density is high, can the feature such as long, non-maintaining, the economic environmental protection of big current fast charging and discharging, service life cycle, can absorb or discharge large energy fast; Energy storage module is connected on the intermediate dc bus of electricity generation system converter plant by two-way DC/DC converter, the input of detecting unit is connected to converter plant intermediate dc bus and ultracapacitor energy storage module two ends respectively, and detection signal is inputed to EMS, EMS is connected with the electronic power switch IGBT in DC/DC converter, control IGBT opening or turning off, and controls the flowing of energy between energy storage module and electricity generation system bus.Flat wave apparatus is connected between the converter plant intermediate dc bus of two-way DC/DC converter and electricity generation system, for eliminating spike in energy exchange processes.
Two-way DC/DC transformer configuration is two-way step down/boost chopper, is externally released energy by ultracapacitor energy storage module when boost chopper state, charges to ultracapacitor energy storage module when buck chopper state.
EMS is compared and analytical calculation by the command voltage to the electricity generation system gathered and the voltage of ultracapacitor energy storage module, current signal and systemic presupposition, current signal, thus sending pulse signal, in control DC/DC converter, electronic power switch opening or turning off.
Flat wave apparatus is made up of smoothing reactor Ld, diode D and discharge resistance Rd, and diode D and discharge resistance Rd is in parallel with smoothing reactor Ld after connecting.
Two-way DC/DC converter comprises inductance L s, electric capacity Cs, electronic switch IGBT1, IGBT2 and storage capacitor Cd and forms, when booste operation, and IGBT2 action, IGBT1 ends, and converter is operated in boost state; When brownout operation, IGBT1 action, during IGBT2 cut-off, converter is operated in buck state.
The solution of the present invention is exactly detected the voltage of electricity generation system in real time by detecting unit, the voltage of current signal and ultracapacitor energy storage module, current signal, detection signal is flowed to after EMS by and instruction voltage, current signal compares, analyze the running status of electricity generation system and ultracapacitor energy storage module, judge that energy storage device needs to absorb energy and still externally releases energy, and judge to export trigger impulse according to above, control the operation of two-way DC/DC converter, thus control the flowing of energy between electricity generation system and energy storage module, absorb by demand or release energy.At discharge and recharge initial time, flat wave apparatus plays the effect of buffering spike, absorbs sudden change energy, then consumed by diode D and resistance Rd, avoid having an impact to system by smoothing reactor Ld.
The embodiment of the present invention as shown in Figure 2, equipped by power transmission and distribution and " ac-dc-ac inverter device " rear drive motor runs, and power back-off of the present invention and energy recycle device access in electricity generation system converter plant intermediate dc bus by jet dynamic control.Below in conjunction with specific embodiment structure chart, specific works process of the present invention is described:
(1) during load power increase in demand
When load power fluctuation, when power demand increases, converter plant bus current can increase, voltage can reduce, detecting unit gathers intermediate dc busbar voltage, EMS is passed to after current signal, EMS is by the command voltage of this signal and setting, current signal compares, when bus current higher than instruction current or busbar voltage lower than command voltage time, EMS sends pulse signal by computational analysis, control IGBT1 turns off, and IGBT2 turns on and off according to certain duty ratio, now two-way DC/DC converter is in boost boost chopper state, ultracapacitor energy storage module is outwards released energy according to certain electric current by DC/DC converter, with the underpower of offset electricity generation system, maintain system stable operation.Voltage, the current signal of detecting unit also Real-time Collection energy storage module in the process, when energy storage module brownout or discharging current excessive time can adjust trigger impulse, avoid the overdischarge of energy storage module.
(2) when the reduction of load power demand or feedback energy
When load power fluctuation, when power demand reduces, converter plant bus current can reduce, EMS is sent to after detecting unit collection signal, EMS can by the command voltage of this signal and setting, current signal compares, when bus current is lower than instruction current, EMS sends pulse signal by computational analysis, control IGBT2 turns off, and IGBT1 turns on and off according to certain duty ratio, now two-way DC/DC converter is in buck buck chopper state, electricity generation system is charged to ultracapacitor energy storage module by DC/DC converter, with the energy of supplementary energy storage module, and discharge when load power increase in demand.
When load is motor, when slowing down, braking or reversing operation, motor is in generator operation state, and can produce regenerated energy and feed back to intermediate dc bus by inversion unit in frequency converter, now busbar voltage can raise.EMS is passed to after detecting unit collection signal, by this voltage signal and instruction voltage signal is compared, when busbar voltage is higher than command voltage, EMS sends pulse signal by computational analysis, control IGBT2 turns off, and IGBT1 turns on and off according to certain duty ratio, now two-way DC/DC converter is also in buck buck chopper state, electricity generation system is charged to ultracapacitor energy storage module by DC/DC converter, to absorb the energy of feedback, and discharge when load power increase in demand.
In the above process, voltage, the current signal of detecting unit also Real-time Collection ultracapacitor energy storage module, when energy storage module voltage is high or charging current is excessive, EMS can adjust the duty ratio of pulse, avoids the overcharge of energy storage module voltage.
In sum, power back-off and energy recycle device according to the running status of electricity generation system, can dynamically regulate its power-balance; Outwards release energy when load power increase in demand, the operation of support load; When load power demand reduces from electricity generation system makeup energy; When feedback loading energy, it absorbed and recycle.Power back-off of the present invention and the adjustable electricity generation system power-balance of energy recycle device, mild electric power system fluctuate, the stable operation of peak load shifting, safeguards system.
Below by way of emulation embodiment, invention is described in detail:
Embodiment one
Electricity generation system, by the electric set electric supply of rated power 20kW, is run by converter plant rear drive motor; Ultracapacitor energy storage module is composed in series by 90 200F ultracapacitors, is connected in parallel on converter plant intermediate dc bus by two-way DC/DC converter, and under specified running status, the voltage of converter plant DC bus is 480V.
When 10s, load power increases 2kW suddenly, recovers, cause a power fluctuation to above-mentioned electricity generation system after continuing 0.5s; And load power increases 5kW suddenly when 20s, recover after continuing 0.5s.Detect respectively and do not drop into and drop in power back-off of the present invention and energy recycle device situation, the voltage of converter plant intermediate dc bus and operation of electric power system state.
(1) power back-off of the present invention and energy recycle device is not dropped into.
The voltage waveform of converter plant intermediate dc bus as shown in Figure 3.Can find out, increase suddenly due to power demand in the 10s moment, cause busbar voltage to fall, drop to 445V from 480V, recover subsequently.In the 20s moment because power demand increases suddenly and amplitude is comparatively large, cause electricity generation system voltage fluctuation very large, cause shutdown, Voltage Drop is to 0V.
(2) power back-off of the present invention and energy recycle device is dropped into.
The voltage waveform of converter plant intermediate dc bus as shown in Figure 4.Can find out, after dropping into device of the present invention, when load power fluctuates, system voltage fluctuation is very little, overall level and smooth, proves that this device effectively can improve the stable operation of the withstand load fluctuation ability of system, mild load power fluctuation, safeguards system.
Embodiment two
Still for electricity generation system described in specific embodiment one.
When 10s, load is with the power of 2kW to electricity generation system feedback energy, recovers, cause a voltage fluctuation to above-mentioned electricity generation system after continuing 1s; And when 20s with the power of 5kW to electricity generation system feedback energy, continue to recover after 0.5s.Detect respectively and do not drop into and drop in device situation of the present invention, the voltage of converter plant intermediate dc bus and operation of electric power system state.
(1) power back-off of the present invention and energy recycle device is not dropped into
The voltage waveform of converter plant intermediate dc bus as shown in Figure 5.Can find out, in the 10s moment due to load feedback energy, cause busbar voltage to rise, rise sharply to 535V from 480V, recover subsequently.In the 20s moment because load feedback energy is comparatively large, cause generating set to be shut down, cause busbar voltage first to raise and drop to 0V afterwards.
(2) power back-off of the present invention and energy recycle device is dropped into
The voltage waveform of converter plant intermediate dc bus as shown in Figure 6.Can find out, after feeding device, because energy storage module absorbs the energy of feedback, therefore system voltage fluctuation is very little when load feedback energy, overall level and smooth, prove that this device effectively can improve the stable operation of the withstand load fluctuation ability of system, mild load power fluctuation, safeguards system.
From above case study on implementation, gas power generation system power back-off of the present invention and energy recycle device effectively can improve the ability that electricity generation system withstand load fluctuates, and can discharge or absorb the stable operation of a large amount of energy, mild power fluctuation, adjustment electricity generation system power-balance, safeguards system when load changes suddenly in short-term; And because the regenerated energy produced load braking absorbs and recycles, effectively improve the effective rate of utilization of the energy.
Claims (6)
1. gas power generation system power back-off and an energy recycle device, is characterized in that: comprise ultracapacitor energy storage module, two-way DC/DC converter, EMS, detecting unit peace wave apparatus, super capacitor energy-storage module is connected with the converter plant intermediate dc bus of electricity generation system by two-way DC/DC converter, flat wave apparatus is connected between the converter plant intermediate dc bus of two-way DC/DC converter and electricity generation system, for eliminating spike in energy exchange processes, detecting unit is connected to converter plant intermediate dc bus and ultracapacitor energy storage module two ends respectively, detection signal is passed to EMS by detecting unit, EMS is connected with the electronic power switch in DC/DC converter, EMS is by computational analysis electricity generation system voltage, current parameters, control the operation of two-way DC/DC converter, thus the energy exchange controlled between super capacitor energy-storage mould and electricity generation system.
2. gas power generation system power back-off according to claim 1 and energy recycle device, it is characterized in that: described two-way DC/DC transformer configuration is two-way step down/boost chopper, externally released energy by ultracapacitor energy storage module when boost chopper state, when buck chopper state, ultracapacitor energy storage module is charged.
3. gas power generation system power back-off according to claim 1 and energy recycle device, it is characterized in that: described EMS is compared and analytical calculation by the command voltage to the electricity generation system gathered and the voltage of ultracapacitor energy storage module, current signal and systemic presupposition, current signal, thus sending pulse signal, in control DC/DC converter, electronic power switch opening or turning off.
4. the gas power generation system power back-off according to claim 1,2 or 3 and energy recycle device, is characterized in that: described ultracapacitor energy storage module is combined by the connection in series-parallel of multiple ultracapacitor monomer.
5. the gas power generation system power back-off according to claim 1,2 or 3 and energy recycle device, it is characterized in that: described flat wave apparatus is made up of smoothing reactor Ld, diode D and discharge resistance Rd, diode D and discharge resistance Rd is in parallel with smoothing reactor Ld after connecting.
6. the gas power generation system power back-off according to claim 1,2 or 3 and energy recycle device, it is characterized in that: described two-way DC/DC converter comprises inductance L s, electric capacity Cs, electronic switch IGBT1, IGBT2 and storage capacitor Cd and forms, when booste operation, IGBT2 action, IGBT1 ends, and converter is operated in boost state; When brownout operation, IGBT1 action, IGBT2 ends, and converter is operated in buck state.
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| CN105391150A (en) * | 2015-12-04 | 2016-03-09 | 郑州宇通客车股份有限公司 | Trolleybus power supply system and power supply control method thereof |
| CN107831882A (en) * | 2017-11-24 | 2018-03-23 | 英业达科技有限公司 | Computer installation |
| CN108054808A (en) * | 2018-01-22 | 2018-05-18 | 北京合众汇能科技有限公司 | A kind of super capacitor module ultra-long time pressurize circuit |
| CN109494789A (en) * | 2018-11-09 | 2019-03-19 | 国电南瑞科技股份有限公司 | A kind of energy management method and system |
| CN110323761A (en) * | 2019-06-26 | 2019-10-11 | 海南电网有限责任公司 | A method of the large sized unit of reply load transition impacts power grid |
| CN112671007A (en) * | 2020-12-28 | 2021-04-16 | 浙江朗普电气科技有限公司 | Frequency conversion anti-disturbance intelligent regulation device |
| CN112688301A (en) * | 2020-12-03 | 2021-04-20 | 南方电网科学研究院有限责任公司 | Method for improving capacitance damping of direct current system |
| CN113006936A (en) * | 2021-04-15 | 2021-06-22 | 北京理工大学 | Energy storage integrated module of free piston generator and energy regulation and control method |
| CN113217184A (en) * | 2021-06-18 | 2021-08-06 | 哈尔滨工业大学 | Dynamic energy adjusting system suitable for impact load of gas generator set |
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| CN105391150B (en) * | 2015-12-04 | 2018-11-06 | 郑州宇通客车股份有限公司 | A kind of power supply system for trolley bus and its method for controlling power supply |
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| CN112688301A (en) * | 2020-12-03 | 2021-04-20 | 南方电网科学研究院有限责任公司 | Method for improving capacitance damping of direct current system |
| CN112671007A (en) * | 2020-12-28 | 2021-04-16 | 浙江朗普电气科技有限公司 | Frequency conversion anti-disturbance intelligent regulation device |
| CN113006936A (en) * | 2021-04-15 | 2021-06-22 | 北京理工大学 | Energy storage integrated module of free piston generator and energy regulation and control method |
| CN113217184A (en) * | 2021-06-18 | 2021-08-06 | 哈尔滨工业大学 | Dynamic energy adjusting system suitable for impact load of gas generator set |
| CN113217184B (en) * | 2021-06-18 | 2022-07-05 | 哈尔滨工业大学 | Dynamic energy adjusting system suitable for impact load of gas generator set |
| CN113949048A (en) * | 2021-10-18 | 2022-01-18 | 南方电网电力科技股份有限公司 | Direct-current microgrid fault current controller and control method thereof |
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Application publication date: 20150715 |