CN204361730U - Wind-force, photovoltaic, diesel generation three power supply send out electric power system - Google Patents

Abstract

Wind-force, photovoltaic, diesel generation three power supply send out electric power system, are made up of Switched Reluctance GeneratorUsed in Wind Energy Converter System, photovoltaic generating system, diesel engine generator group system, buck-boost chopper, electrical storage device, inverter, rectifier, AC load, DC load; Its technical characteristic is, described Switched Reluctance GeneratorUsed in Wind Energy Converter System is connected with described buck-boost chopper, buck-boost chopper is all connected with described electrical storage device with described photovoltaic generating system, electrical storage device is connected with described inverter and described DC load simultaneously, inverter is connected with described AC load, described diesel engine generator group system is connected with described rectifier and AC load simultaneously, and rectifier is connected with DC load; This system can be used for the needs of remote resident's productive life stable power-supplying without the area that electrical network covers and wind and solar energy enriches.

Description

Wind power, photovoltaic, diesel power generation three power generation and power supply system

technical field

The invention relates to the field of complementary power generation and power supply, in particular to a three-power power generation and power supply system using a switched reluctance generator as a wind power generator and cooperating with photovoltaic power generation and a diesel generator set.

Background technique

Clean, green, and environmentally friendly wind power and solar power are the forms of renewable energy power generation that have been developed at home and abroad for many years.

At present, wind turbines are mainly double-fed asynchronous wind turbines and direct-drive full-power conversion permanent magnet synchronous wind turbines, and some squirrel-cage asynchronous wind turbines; double-fed asynchronous wind turbines have better Cost-effective, but its transmission chain often has a gearbox, which puts forward strict requirements on the reliability and maintainability of the unit; the direct-drive full-power conversion permanent magnet synchronous wind turbine avoids the maintenance workload of the gearbox, Reliability has been improved, but due to its low speed, with the increase of power, the manufacturing process of multi-pole permanent magnet synchronous generator is complicated, the technology is difficult, the motor is large, and the cost is high; squirrel-cage asynchronous wind power generation Units are gradually being eliminated due to low utilization rate of wind energy and poor adaptability.

The structure of the switched reluctance generator is simple, and there is no brush, no winding, and no permanent magnet on the rotor; when it operates, it is equivalent to a current source, so that within a certain speed range, the output terminal voltage will not change with the change of the speed. It is very suitable for the current mainstream wind turbines with variable speed operation, which can improve the utilization efficiency of wind energy; the switched reluctance generator can achieve high power generation efficiency under the direct drive of wind force, and also saves the gearbox, making the structure of the entire power generation system more efficient. Simple and reliable, this is the development trend of wind power generation system; and in the operation process, the switched reluctance generator has many controllable parameters, such as switching angle control, current chopping control, PWM control, etc., which can be easily compared Complex control strategy, flexible control of output DC voltage and current.

At present, wind-solar complementary power generation systems are more common, but a new type of wind power generator and photovoltaic power generation complementary system using switched reluctance generators has not been reported yet.

In view of the characteristics of the switched reluctance generator directly outputting pulsating direct current, the power conversion system of its output interface part should be completely different from the output of the conventional alternator. Direct current is more conducive to charging the battery.

Diesel generator sets are traditional conventional power generation devices for areas without grid coverage, and the generators in them generally use AC synchronous generators at present.

In some remote areas without grid coverage in our country, they are often relatively poor rural or pastoral areas. Most of these areas also mean that the three north areas are arid and rainless, and rich in solar energy and wind energy. They have unique conditions for utilizing wind energy and solar energy, but also It is only feasible to use facilities with low investment and easy maintenance; in addition, fossil fuels such as diesel pollute the environment, and the use of renewable energy is often more likely to receive government subsidies; therefore, effective use of renewable energy, taking into account long-term effects After stabilizing the power supply, simplifying the structure of the power generation and power supply system, and reducing costs, etc., multi-power generation and power supply facilities including renewable energy power generation should have practical significance in these areas.

Contents of the invention

According to the above background technology, the utility model proposes to adopt the switched reluctance generator as the wind power generator, the squirrel-cage three-phase asynchronous generator is a diesel generator, the output voltage of the switched reluctance generator can be adjusted, wind power, photovoltaic, diesel The multi-power system with combined power supply of three power sources and battery energy storage backup can enhance the stability and durability of power supply, with simple structure, high reliability, low cost and simple maintenance.

The technical scheme of the utility model is:

Wind, photovoltaic, and diesel power generation and power supply system, consisting of switched reluctance wind power generation system 1, photovoltaic power generation system 2, diesel generator set system 3, buck-boost chopper 4, power storage device 5, inverter 6, It consists of a rectifier 7, an AC load 8, and a DC load 9; its technical feature is that the switched reluctance wind power generation system 1 is connected to the buck-boost chopper 4, and the buck-boost chopper 4 is connected to the photovoltaic power generation The systems 2 are all connected to the power storage device 5, the power storage device 5 is connected to the inverter 6 and the DC load 9 at the same time, the inverter 6 is connected to the AC load 8, and the diesel generator set system 3 is connected to the rectifier 7 and the AC load 8 at the same time, and the rectifier 7 is connected to the DC load 9.

The switched reluctance wind power generation system 1 includes a wind turbine, a switched reluctance generator and its controller, and a power converter.

The photovoltaic power generation system 2 includes a photovoltaic cell array and a photovoltaic controller.

The generator in the diesel generator set system 3 is a squirrel-cage AC asynchronous generator.

The buck-boost chopper 4 refers to a chopper circuit that can step-up or step-down convert the input DC voltage, specifically a buck-boost chopper or a Cuk chopper or a Sepic chopper or a Zeta chopper. The chopper changes its output DC voltage by adjusting the switching duty cycle of the only power electronic switching tube inside it.

The switched reluctance wind power generation system 1 is a buck-boost chopper 4, and the photovoltaic power generation system 2 outputs direct current in series or in parallel.

The main technical effects of the utility model are:

The wind power, photovoltaic and diesel power generation power supply system of the utility model effectively utilizes wind energy and solar energy to protect the environment; when the wind energy and solar energy or one of them is relatively abundant and sufficient to load the required electric energy, the diesel generator system shuts down, Only when the wind energy and solar energy are weak, and the electric energy in the power storage device is exhausted and cannot meet the load, the diesel generator set starts to run.

The switched reluctance generator is used as the wind power generator. The switched reluctance generator can be directly driven, and its structure is simpler and lower than the permanent magnet synchronous generator. It directly outputs pulsating direct current, which is more conducive to charging the storage device. Moreover, it can be connected in parallel or in series with photovoltaic cells that are also direct current output; the electric energy conversion structure is simplified and the cost is reduced.

Since the permanent magnet synchronous generator will inevitably lose its magnetism during long-term operation, resulting in a decrease in efficiency, in addition, the high-performance permanent magnet material has strong magnetism but is very expensive; and the electrically excited synchronous generator requires a dedicated DC power supply; therefore, it is used The diesel generating set system of the squirrel-cage asynchronous generator simplifies the structure and reduces the cost.

It can be seen that the utility model not only improves the continuity and stability of power supply compared with existing complementary power generation systems such as wind and solar hybrid, photovoltaic and diesel complementary, wind power and diesel complementary, but also a system with simple structure and low cost. This is especially important, because in remote areas without power grids, it is often difficult for technicians to go to maintain and economically backward areas. The simple structure means high reliability and less maintenance, and low cost is more conducive to practical application.

Description of drawings

Fig. 1 shows the structural diagram of the wind power, photovoltaic and diesel power generation and power supply system of the present utility model.

Detailed ways

As shown in Figure 1, it is a structural diagram of a three-power power generation system of wind power, photovoltaic power and diesel power generation. In fact, it can also be said to be a four-power power system, because the power storage device 5 can replace them to supply power to the load when wind power and photovoltaic power cannot generate electricity normally. For power supply, the diesel generator set system 3 is only started when the electric energy in the power storage device 5 is exhausted and cannot meet the load.

The switched reluctance wind power generation system 1 is composed of a small wind turbine, a supporting small switched reluctance generator and its controller, and a power converter, and it can complete voltage feedback control and maximum power point tracking control by itself. The rated power and rated voltage of the wind power generation system are equal to or similar to the rated power and rated voltage of the photovoltaic power generation system 2; the rated charging voltage of the power storage device 5 should be significantly less than the sum of the rated output voltages of the above two.

The buck-boost chopper 4 converts the DC voltage generated by the switched reluctance wind power generation system 1, and can be one of a buck-boost chopper, a Cuk chopper, a Sepic chopper, and a Zeta chopper. , by changing the switching duty cycle of the only power electronic switching tube in the above chopper, the output DC voltage of the chopper is adjusted; if the output of the buck-boost chopper 4 is in parallel with the output of the photovoltaic power generation system 2, the boost The step-down chopper 4 needs to adjust the duty cycle of its internal power electronic switching tube through the detection feedback of the photovoltaic cell illuminance to prevent the circulation between the step-down chopper 4 and the photovoltaic power generation system 2. If the above two power generation Insufficient, that is, the output voltage drops to a certain level, and the power electronic switch tube connected to it in the storage device 5 is disconnected to prevent the electric energy in the storage device 5 from flowing back into the above power generation system, and the power storage device 5 is turned to the inverter. If the output of the buck-boost chopper 4 is connected in series with the output of the photovoltaic power generation system 2, the function of the buck-boost chopper 4 is mainly to stabilize the relationship between it and the output voltage of the photovoltaic power generation system 2. And the role of stabilizing the charged voltage of the power storage device 5: when the output of the photovoltaic power generation system 2 is about the rated state and the output of the switched reluctance wind power generation system 1 is also about the rated state, the buck-boost chopper 4 is mainly used for stepping up and down the voltage. Their total output voltage is stable. When the output of the photovoltaic power generation system 2 is about the rated state and the output of the switched reluctance wind power generation system 1 is insufficient but still in operation, the buck-boost chopper 4 adjusts the output according to the charging voltage of the power storage device 5 voltage, when the output of the photovoltaic power generation system 2 is insufficient but still able to operate and the output of the switched reluctance wind power generation system 1 is around the rated state, the buck-boost chopper 4 also adjusts the output voltage according to the charging voltage requirement of the power storage device 5, When the output of the two power generation systems is obviously insufficient but can still effectively output positive power, if the boost function of the buck-boost chopper 4 can maintain the output voltage to meet the needs of the power storage device 5, then the buck-boost chopper The role of the chopper 4 is particularly obvious, which improves the utilization rate of renewable energy; if the output of the two is insufficient and the buck-boost chopper 4 reaches the boost limit and still cannot meet the charging needs of the power storage device 5, then the second power generation device is turned off and the power storage device 5 is turned off. The electric device 5 supplies power to the inverter 6 and the DC load 9; after the electric energy of the power storage device 5 is exhausted and an alarm message is issued, the small diesel generating set system 3 is manually started and put into operation to generate power; Power generation system 1, that is, whether the output of step-down chopper 4 is connected in parallel or in series with the output of photovoltaic power generation system 2. When one side must stop due to insufficient energy source and insufficient power generation, it needs to be disconnected from the power supply line through the power electronic switch tube. Connection.

When the wind force is insufficient to stop power generation, the duty cycle of the power electronic switching tube in the buck-boost chopper 4 is maintained at the control point of the maximum proportional relationship of the boost, that is, when the wind force is detected to be sufficiently large, the front end of the power storage device 5 At the moment when the switch is closed, the buck-boost chopper 4 is at the maximum boost ratio, and it is adjusted according to the actual situation after starting, which is also beneficial to the maximum utilization of wind energy.

The respective outputs of the power storage device 5 and the rectifier 7 cannot supply power to the DC load 9 at the same time. The connection between 5 and the DC load 9 needs to be disconnected; the respective outputs of the diesel generator system 3 and the inverter 6 cannot supply power to the AC load 8 at the same time, similarly, the other line is disconnected when one is working.

One solution of the rectifier 7 is to adopt an uncontrolled diode bridge rectification main circuit, and the voltage required by the DC load 9 is different from the output or when the load contains multiple loads with different voltage requirements, it is generated by the conversion of its internal DC power supply circuit; Alternatively, a bridge rectifier circuit composed of controllable power electronic switching tubes is used. Of course, if the DC load 9 is composed of multiple loads with different voltage requirements, a separate DC power supply is still required for secondary conversion.

AC loads 8 such as AC water pumps and lighting required for pumping irrigation, etc., require different voltage levels to be obtained by secondary power conversion.

The switched reluctance wind power generation system 1, the photovoltaic power generation system 2, the internal control device of the inverter 6, and if there is a rectifier 7 of the internal control device, the DC power required by them is provided by a special small storage battery, and the charging of these storage batteries uses a DC load 9 Bring out the appropriate power supply.

Claims (6)

1. wind-force, photovoltaic, diesel generation three power supply send out electric power system, are made up of Switched Reluctance GeneratorUsed in Wind Energy Converter System (1), photovoltaic generating system (2), diesel engine generator group system (3), buck-boost chopper (4), electrical storage device (5), inverter (6), rectifier (7), AC load (8), DC load (9), its technical characteristic is, described Switched Reluctance GeneratorUsed in Wind Energy Converter System (1) is connected with described buck-boost chopper (4), buck-boost chopper (4) is all connected with described electrical storage device (5) with described photovoltaic generating system (2), electrical storage device (5) is connected with described inverter (6) and described DC load (9) simultaneously, inverter (6) is connected with described AC load (8), described diesel engine generator group system (3) is connected with described rectifier (7) and AC load (8) simultaneously, rectifier (7) is connected with DC load (9).

2. wind-force according to claim 1, photovoltaic, diesel generation three power supply send out electric power system, it is characterized in that, described Switched Reluctance GeneratorUsed in Wind Energy Converter System (1) comprises wind energy conversion system, switch reluctance generator and controller thereof and power inverter.

3. wind-force according to claim 1, photovoltaic, diesel generation three power supply send out electric power system, it is characterized in that, described photovoltaic generating system (2) comprises photovoltaic battery array and photovoltaic controller.

4. wind-force according to claim 1, photovoltaic, diesel generation three power supply send out electric power system, it is characterized in that, the generator in described diesel engine generator group system (3) is squirrel-cage alternating current asynchronous generator.

5. wind-force according to claim 1, photovoltaic, diesel generation three power supply send out electric power system, it is characterized in that, described buck-boost chopper (4) refers to and can boost to input direct voltage or the chopper circuit of decompression transformation, specifically buck-boost chopper or Cuk chopper or Sepic chopper or Zeta chopper, by the adjustment of the duty cycle of switching to the unique electronic power switch pipe in its inside, change its output dc voltage size.

6. wind-force according to claim 1, photovoltaic, diesel generation three power supply send out electric power system, it is characterized in that, described Switched Reluctance GeneratorUsed in Wind Energy Converter System (1) both buck-boost choppers (4), and described photovoltaic generating system (2) exports direct current by the mode of series connection or parallel connection.