CN106953356A - A wind-solar-diesel complementary power supply system and method without energy storage in island mode - Google Patents

Abstract

The invention discloses a power supply system and method for wind and diesel complementary power supply without energy storage in an island mode. The system includes: a photovoltaic power generation system, a wind power monitoring unit. The method includes initializing and starting the power supply system; detecting the converted alternating current energy to obtain photovoltaic power generation power and wind power generation power; and wind power generation power are compared with preset thresholds: according to the comparison result, the AC power converted by the energy conversion unit is controlled to be input into the grid to complete grid connection, and control parameters for adjusting the output power of the diesel generator set are generated and output. The invention realizes grid-connected power generation of wind power and diesel generators, and can regulate and distribute the power of wind power generation and photovoltaic power generation, so as to realize full utilization of new energy power generation and reduce fuel consumption of diesel generators to the greatest extent possible.

Description

A wind-solar-diesel complementary power supply system and method without energy storage in island mode

technical field

The invention relates to a wind-solar-diesel complementary power supply system and method without energy storage in an island mode, and belongs to the technical field of wind-light-firewood complementary power supply.

Background technique

With the rapid development of the current world economy, the energy crisis and environmental problems have become increasingly prominent, and have become one of the major problems that human beings need to solve urgently. Under such circumstances, new energy generation methods such as wind energy, solar energy, biomass energy, and geothermal energy have become research hotspots, among which wind energy and solar energy are inexhaustible clean and renewable resources. favored by people. Over the years, the research on the utilization of these emerging energy sources has also been in-depth.

As a major oil-producing country, most of my country's oil fields are distributed in the northwest, northeast, and south regions, and most of the oil fields in these three regions are distributed in open areas such as Gobi, grasslands, and coastal areas. These areas are generally located in remote and isolated islands. Relying on large power grids requires long-distance laying of cables, which is too costly and poor in economic benefits. At present, most of these areas use diesel generator sets to meet the power supply demand of pumping units, but with the intensification of the energy crisis and the rapid development of new energy power generation technology, how to make full use of new energy in the most economical form and greatly reduce the fuel consumption of diesel units It is an urgent problem to be solved at present; on the other hand, these areas have long sunshine hours, sufficient sunlight, open terrain, and rich wind resources, which are very suitable for the access of wind-solar hybrid systems.

In view of this situation, Chinese scientific researchers have developed many wind-solar hybrid power supply systems to use new energy to generate electricity to solve the power shortage problem. Most of them use wind-solar-diesel-electric complementary power supply systems. It is a high-power consumption load. Generally, the power generation power of the wind and solar system cannot meet the demand of this load. It can only exceed the demand of the entire load in a short period of time to charge the battery pack, so the charging and discharging depth of the battery pack cannot reach the normal value. The life of the battery pack is greatly shortened, and the storage and release of electric energy through the battery increases the loss of electric energy, which increases the operation and maintenance cost of the system. Secondly, the solar-diesel-electric hybrid system is an off-grid type, and the energy storage and backup power supply are given priority to the storage battery. If the scale of the load expands, then the battery pack must be increased, so the cost of the entire system will be greatly increased. Finally, the wind-solar power generation dispatching switching strategy adopted by the existing solar-diesel-electric hybrid system is only for the purpose of using wind power to save diesel, and does not maximize the use of new energy power generation to achieve the purpose of saving diesel.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, to provide an island-mode non-energy-storage, wind-and-firewood complementary power supply system, and to solve the problem that the existing system is based on an off-grid type. The storage battery needs to rely on charging the battery pack, and the purpose of using wind and wind power generation to save diesel is the problem that it is impossible to maximize the use of new energy power generation.

The present invention specifically adopts the following technical solutions to solve the above technical problems:

A complementary power supply system for wind and diesel without energy storage in island mode, including:

Photovoltaic power generation system and wind power generation system, respectively used for photovoltaic power generation and wind power generation to obtain electric energy;

The energy conversion unit is used to convert photovoltaic power generation and wind power generation into AC power output;

Diesel generator set is used as the main power supply unit for system load startup, and maintains the frequency and voltage stability of the power grid during normal operation of the system, and its output power is adjusted according to the received control parameters;

The pumping unit is used as the load of the system;

The intelligent power control unit is used to detect the AC power output by the energy conversion unit to obtain photovoltaic power generation power and wind power generation power, and to detect the operation status of the pumping unit to obtain the actual output power of the pumping unit; and to judge the obtained photovoltaic power generation power and wind power generation Whether the power and the actual output power of the pumping unit are in a normal state, and when it is judged to be in a normal state, according to the comparison results of the photovoltaic power generation power and wind power generation power with the preset threshold, control the AC power output from the energy conversion unit to be connected to the grid , or generate and output control parameters that adjust the output power of the diesel generator set to meet the current load demand;

The intelligent monitoring unit is used to receive and display the actual output power of the pumping unit, the photovoltaic power generation power, the wind power generation power, and the output power of the diesel generator obtained by the intelligent power control unit.

Furthermore, as a preferred technical solution of the present invention: the energy conversion unit includes a photovoltaic controller, a wind power controller, and an inverter control integrated machine connected to the photovoltaic controller and the wind power controller respectively.

Furthermore, as a preferred technical solution of the present invention: the intelligent power control unit includes a power intelligent allocation unit and a parallel unit.

Furthermore, as a preferred technical solution of the present invention: the intelligent power control unit further includes an unloader for deriving AC power.

Further, as a preferred technical solution of the present invention: the intelligent monitoring unit adopts a mobile terminal.

The present invention also proposes a method for complementary power supply of wind and diesel without energy storage in the island mode, which includes the following steps:

Initialize and start the power supply system, and adjust the output power of the diesel generator set according to the current load demand;

Control the conversion of electric energy obtained from photovoltaic power generation and wind power generation into AC power, and detect the obtained AC power to obtain photovoltaic power generation power and wind power generation power; and detect the operating status of the loaded oil pumping unit to obtain the actual output power of the oil pumping unit;

Determine whether the obtained photovoltaic power generation power, wind power generation power, and the actual output power of the pumping unit are in a normal state, and compare the photovoltaic power generation power and wind power generation power with the preset thresholds when they are judged to be in a normal state:

When the photovoltaic power generation or wind power generation power is less than a preset threshold, generate and output control parameters for adjusting the output power of the diesel generator set to meet the current load demand;

When the power of photovoltaic power generation or wind power generation is greater than or equal to the preset threshold, the AC power obtained by the energy conversion unit is controlled to be connected to the grid; and after grid-connected operation, it is detected whether the power of photovoltaic power generation or wind power generation meets the current load demand. Generate and output control parameters for the output power of the diesel generator set to meet the current load demand after grid connection;

The diesel generator set adjusts the output power of the diesel generator set according to the control parameters.

Further, as a preferred technical solution of the present invention: the method generates and outputs control parameters according to the detection results after grid-connected operation, including:

When the detection result does not meet the current load demand, according to the difference between the photovoltaic power generation power or wind power generation power and the current load demand, generate and output control parameters so that the output power of the diesel generator set can be adjusted to meet the current load demand;

When the detection result is to meet the current load demand, generate and output control parameters that enable the diesel generator set to output at the minimum output power, and control to export the remaining AC power after the current load demand is met.

Further, as a preferred technical solution of the present invention: the method further includes uploading the obtained photovoltaic power generation power, wind power generation power, actual output power of the pumping unit and output power of the diesel generator in real time.

The present invention adopts above-mentioned technical scheme, can produce following technical effect:

The non-energy-storage, wind-and-diesel complementary power supply system and method in the island mode of the present invention aim at the problem of large diesel consumption of existing diesel generator sets, and establish a power supply system that uses new energy power generation and diesel generator sets to operate in parallel to the grid, so as to save diesel oil , The goal of improving the utilization rate of new energy power generation.

The parallel unit of the intelligent power control unit is connected to the system, and then the voltage, frequency, and phase of the entire system are controlled, replacing the battery pack, and realizing the transformation from an off-grid power generation system to a grid-connected power generation system. In a large-scale load environment, a large number of battery packs can be removed to achieve no energy storage, thereby saving system costs.

The invention uses a new optimized control strategy for the power intelligent distribution unit of the intelligent power control unit, which can regulate and distribute the power of wind power generation and photovoltaic power generation, so as to realize the maximum utilization of new energy power generation, reduce diesel consumption, and reduce system cost. The self-sufficiency of power supply in the oil field area under the isolated island mode is realized through the wind-solar-diesel hybrid power supply system, without relying on the large power grid for power supply, so as to achieve the purpose of saving costs.

Compared with the traditional system, the present invention has advantages: (1) It uses clean wind power and photovoltaic power generation, which is suitable for the wide use of pumping units in remote oilfield areas; (2) It does not need to configure energy storage, saving cost and pollution ;(3) The access of new energy power generation units greatly reduces the output power of diesel generators and reduces the consumption of diesel; (4) When the output power of new energy power generation units can meet the requirements, maintain the low power output of diesel generator sets , to stabilize the power and voltage phase, and to maintain the stable operation of the entire system. (5) The diesel generator is used as the system support and emergency power supply unit, which effectively improves the reliability of the whole system.

To sum up, the present invention adopts grid-connected power generation of wind and diesel for power supply, saves the energy storage unit, improves the mean time between failures of the system and avoids the secondary pollution of the battery, thereby greatly reducing the cost of power generation and achieving the purpose of saving system cost , has great practical value.

Description of drawings

Fig. 1 is a schematic diagram of modules of a wind-power-diesel complementary power supply system without energy storage in an island mode according to the present invention.

Fig. 2 is a schematic flow chart of the method for power supply without energy storage, wind and diesel in the island mode of the present invention.

detailed description

Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

As shown in Figure 1, the present invention designs a wind-solar-firewood complementary power supply system without energy storage in island mode. The system is mainly composed of photovoltaic power generation system, wind power generation system, diesel generator set, energy conversion unit, intelligent The monitoring unit and the pumping unit are composed of seven parts. The self-sufficiency of power supply in the oilfield area under the island mode is realized through the wind-solar-diesel hybrid power supply system, without relying on the large power grid for power supply, so as to achieve the purpose of saving costs.

Specifically, the photovoltaic power generation system in the system includes a photovoltaic array for photovoltaic power generation to obtain electric energy.

The wind power generation system includes a wind power generating set, which is used for wind power generation to obtain electric energy.

The energy conversion unit is used to convert the electric energy obtained by photovoltaic power generation and wind power generation from direct current to alternating current; it preferably includes a photovoltaic controller, a wind power controller, and an inverter control integrated machine connected to the photovoltaic controller and the wind power controller respectively , wherein the photovoltaic controller is used to convert the electric energy obtained by photovoltaic power generation into direct current electric energy, the wind power controller is used to convert the electric energy obtained by wind power generation into direct current electric energy, and then the direct current is sent to the inverter control integrated machine; the inverter control integrated machine It is used to convert DC power into AC power output, so as to convert the unstable power generated by new energy power generation into stable power and voltage for the entire system.

The diesel generator set is used as the main power supply unit for system load startup, and maintains the frequency and voltage stability of the power grid when the system is running normally, and its output power is adjusted according to the received control parameters.

The pumping unit is used as the load of the system.

The intelligent power control unit is used to detect the AC power output by the energy conversion unit to obtain photovoltaic power generation power and wind power generation power, and to detect the operating state of the oil pumping unit to obtain the actual output power of the oil pumping unit; and judge the obtained photovoltaic power and wind power. Whether the wind power generation power and the actual output power of the pumping unit are in a normal state, and when they are judged to be in a normal state, control the AC power output by the energy conversion unit according to the comparison results of the photovoltaic power generation power and wind power generation power with the preset threshold Grid-connected, or generate and output control parameters that adjust the output power of the diesel generator set to meet the current load demand.

The diesel generator set also adjusts the output power of the diesel generator according to the received control parameters, so that the output power can meet the current load demand or output at the minimum power, and keep the operating state at all times to ensure the constant voltage, frequency and phase of the entire system .

The intelligent monitoring unit is used to receive and display the actual output power of the pumping unit obtained by the intelligent power control unit, the photovoltaic power generation power, the wind power generation power, and the output power of the diesel generator to complete real-time monitoring. Preferably, the intelligent monitoring unit adopts a mobile terminal, such as a mobile phone, a tablet, and the like.

In the system, the number and rated power of the diesel generators of the diesel generator set depend on the maximum power load of the pumping unit; the current number and real-time power of the diesel generator set put into operation are based on the current power load and The current output power of the wind power and photovoltaic power generation system is adjusted in real time; the diesel generator set is also used to support the voltage, frequency and phase of the system.

Further, the intelligent power control unit includes a power intelligent distribution unit and a parallel unit. The parallel unit mainly controls the input of the AC power converted by the energy conversion unit into the grid to complete the grid connection; the power intelligent distribution unit mainly judges whether the obtained photovoltaic power generation power, wind power generation power, and the actual output power of the pumping unit are in a normal state , and when it is judged to be in a normal state, compare the photovoltaic power generation power and wind power generation power with the preset thresholds respectively, and control the AC power converted by the energy conversion unit into the grid according to the comparison results to complete the grid connection, and after the grid connection operation Detect whether the photovoltaic power generation or wind power generation power meets the current load demand, and generate and output control parameters for the output power of the diesel generator set to meet the current load demand after grid connection according to the detection results.

And, the system intelligent power control unit also includes an unloader for exporting electric energy, which can be used to detect that the power of photovoltaic power generation or wind power generation meets the current load demand after grid-connected operation, and control the export of excess AC power.

Therefore, the system can regulate and distribute the power of wind power and photovoltaic power generation to achieve the maximum utilization of new energy power generation. Through the wind-solar-diesel hybrid power supply system, the power supply in the oilfield area is self-sufficient in the island mode, without relying on large power grids for power supply.

On the basis of the above system, the present invention also proposes a power supply method for wind and diesel without energy storage in the island mode, as shown in Figure 2, the method specifically includes the following steps:

Step 1. Initialize and start the power supply system, including starting the pumping units sequentially after starting the diesel generating set, and adjusting the output power of the diesel generating set according to the current load demand.

Step 2, controlling the conversion of the electric energy obtained from the photovoltaic power generation and the wind power generation to complete the conversion from direct current to the alternating current power, and detecting the converted alternating current power to obtain the photovoltaic power generation power and the wind power generation power. And detect the running state of the loaded pumping unit to obtain the actual output power of the pumping unit.

During this process, the operating status of all pumping units can be detected, and the faulty pumping units can be alarmed and maintained; the operating status of all wind power generating units and photovoltaic arrays can be detected, and faulty or abnormal Fans and photovoltaic arrays are alarmed and repaired and maintained.

Step 3, judging whether the obtained photovoltaic power generation power, wind power generation power, and actual output power of the pumping unit are in a normal state. When the photovoltaic power generation power, wind power generation power, and the actual output power of the pumping unit are in a normal state, compare the photovoltaic power generation power and wind power generation power with the preset threshold respectively: when the photovoltaic power generation power or wind power generation power is less than the preset threshold value , does not need to be powered by photovoltaic and wind power, and is completely powered by diesel generators, generating and outputting control parameters for adjusting the output power of diesel generators to meet the current load demand, so as to adjust the output power of diesel generators in real time to meet the current load need.

When the power of photovoltaic power generation or wind power generation is greater than or equal to the preset threshold, the control will input the AC power converted by the energy conversion unit into the grid to complete the grid connection, and the insufficient part will be supplemented by the diesel generator set to realize grid-connected operation with the diesel generator set.

After realizing the grid-connected operation of the system, detect whether the photovoltaic power generation or wind power generation power meets the current load demand, and generate and output control parameters according to the detection results; specifically:

When it is detected that the photovoltaic power generation or wind power generation power does not meet the current load demand after grid-connected operation, according to the difference between the photovoltaic power generation power or wind power generation power and the current load demand, control parameters are generated and output to adjust the output power of the diesel unit in real time. The above-mentioned diesel generating set adjusts the output power of the diesel generating set according to the control parameters, so that it can run with reasonable power consumption.

After grid-connected operation, it is detected that the power of photovoltaic power generation or wind power generation meets the current load demand, and the wind and light systems mainly provide the power required by the load, and control the remaining AC power after meeting the current load demand to be exported through the unloader, so that Diesel generator sets output at minimum power.

Moreover, the diesel engine keeps running all the time during the above process to ensure the constant voltage, frequency and phase of the whole system.

Further, the method may also include uploading the obtained photovoltaic power generation power, wind power generation power, actual output power of the pumping unit and output power of the diesel generator in real time, so as to complete real-time monitoring and fault alarm of the system.

In summary, the present invention connects the parallel unit of the intelligent power control unit to the system, and then controls the voltage, frequency, and phase of the entire system, replacing the battery pack, and realizes the conversion from an off-grid power generation system to a grid-connected power generation system. The power of wind power generation and photovoltaic power generation can be regulated and allocated to achieve maximum utilization of new energy power generation, reduce diesel consumption, and reduce system costs. The self-sufficiency of power supply in the oil field area under the isolated island mode is realized through the complementary power supply system of wind and diesel, without relying on the large power grid for power supply. In this way, in a large-scale load environment such as an oil field, a large number of battery packs can be removed to achieve no energy storage, thereby saving system costs. The power supply system established by the present invention is operated in parallel with new energy power generation and diesel generating sets, so as to realize the goals of saving diesel oil and improving the utilization rate of new energy power generation.

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and can also be made without departing from the gist of the present invention within the scope of knowledge possessed by those of ordinary skill in the art. Variations.

Claims (8)

1. under a kind of island mode without energy storage wind-solar-diesel complementary electric power system, it is characterised in that including：

Photovoltaic generating system and wind generator system, are respectively used to photovoltaic generation and wind-power electricity generation obtains electric energy；

Energy conversion unit, is changed to AC energy output for obtaining electric energy to photovoltaic generation and wind-power electricity generation；

Diesel generating set, remains electric for the main power supply unit started as system load, and when system is normally run The frequency and voltage stabilization of net, and its power output is adjusted according to the control parameter of reception；

Oil pumping unit, for the load as system；

Intelligent power control unit, the AC energy for detecting energy conversion unit output obtains photovoltaic generation power and wind-force Generated output, and detect that the running status of oil pumping unit obtains the output actual power of oil pumping unit；And judge gained photovoltaic hair Whether electrical power and wind-power electricity generation power, the output actual power for unit of pumping are in normal condition, and are judging to be in just Comparative result during normal state according to photovoltaic generation power and wind-power electricity generation power respectively with predetermined threshold value, control converts energy The AC energy of unit output is grid-connected, or generation and output adjust diesel generating set power output to meet current loads demand Control parameter；

Intelligent monitoring unit, for receiving and showing the output actual power of oil pumping unit, light obtained by intelligent power control unit Lie prostrate generated output, wind-power electricity generation power, and diesel-driven generator power output.

2. according to claim 1 under island mode without energy storage wind-solar-diesel complementary electric power system, it is characterised in that：The energy Measuring conversion unit includes photovoltaic controller, wind-powered electricity generation controller, and the inversion control being connected respectively with photovoltaic controller, wind-powered electricity generation controller All-in-one processed.

3. according to claim 1 under island mode without energy storage wind-solar-diesel complementary electric power system, it is characterised in that：The intelligence Energy power control unit includes power intelligent allocation unit and and machine unit.

4. according to claim 1 under island mode without energy storage wind-solar-diesel complementary electric power system, it is characterised in that：The intelligence Energy power control unit also includes being used for unloader derived from AC energy.

5. according to claim 1 under island mode without energy storage wind-solar-diesel complementary electric power system, it is characterised in that：The intelligence Energy monitoring unit uses mobile terminal.

6. under a kind of island mode without energy storage wind-solar-diesel complementary method of supplying power to, it is characterised in that comprise the following steps：

Initialization starts electric power system, and according to the power output of current loads demand regulation diesel generating set；

Photovoltaic generation and wind-power electricity generation are obtained electric energy and changed to AC energy, and detection gained AC energy acquisition photovoltaic by control Generated output and wind-power electricity generation power；And the running status of the loaded oil pumping unit of detection, obtain the output reality of oil pumping unit Border power；

Judge gained photovoltaic generation power and wind-power electricity generation power, whether the output actual power for unit of pumping is in normal shape State, and compared photovoltaic generation power and wind-power electricity generation power with predetermined threshold value respectively when judging and being in normal condition：

When photovoltaic generation power or wind-power electricity generation power are less than predetermined threshold value, generate and export for adjusting diesel generating set Power output to meet the control parameter of current loads demand；

When photovoltaic generation power or wind-power electricity generation power are more than or equal to predetermined threshold value, control will be handed over obtained by energy conversion unit Flow electric energy grid-connected；And detect whether photovoltaic generation power or wind-power electricity generation power meet current loads demand after being incorporated into the power networks, Generated according to testing result and export the power output for diesel generating set to meet the control of grid-connected rear current loads demand Parameter processed；

The diesel generating set adjusts the power output of diesel generating set according to control parameter.

7. according to claim 6 under island mode without energy storage wind-solar-diesel complementary method of supplying power to, it is characterised in that：The side Method is generated and output control parameter after being incorporated into the power networks according to testing result, including：

When testing result is to be unsatisfactory for current loads demand, generated output or wind-power electricity generation power are lied prostrate according to photovoltaic and born with current Lotus demand difference, generation and output control parameter make it that the power output for adjusting diesel generating set meets current loads demand；

When testing result for when meeting current loads demand, generation and output make it that diesel generating set is defeated with minimum output power The control parameter gone out, and control will meet the export of the remaining AC energy after current loads demand.

8. according to claim 6 under island mode without energy storage wind-solar-diesel complementary method of supplying power to, it is characterised in that：The side Method is also included to gained photovoltaic generation power, wind-power electricity generation power, the output actual power for unit of pumping and diesel-driven generator Power output is uploaded in real time.