KR101793579B1 - Dc-ac common bus type hybrid power system - Google Patents

Abstract

The present invention discloses a DC-AC common linear hybrid power system. The present invention adopts a DC-AC common linear hybrid power supply system that combines a DC common power supply system and an AC common power supply system in the configuration of a stand-alone hybrid power supply system, Disadvantages and AC Overcomes the drawbacks of common-mode power systems. More specifically, the present invention relates to a method of controlling a DC common power supply system, which is coupled to an alternating current common bus, so that, even when a power supply source of a DC common power supply system is stopped or a failure occurs, Since the power is supplied from the generator to the load, the power supply can be made more reliable because no power failure occurs. Further, the present invention basically operates by supplying the power from the DC common power supply system to the load side and operating the AC common power supply system equipped with the diesel generator as the secondary energy supply means corresponding to the increasing / decreasing load, It is possible to eliminate the problem caused by generation of reverse power while facilitating expansion or contraction of the supply capacity of the system in response to load fluctuation or continuous load increase or decrease and also to connect the diesel generator to the AC common power supply system, It is not necessary to install an automatic charger and an automatic transfer switch for switching the power supply, so that the initial investment cost can be reduced.

Description

[0001] DC-AC COMMON BUS TYPE HYBRID POWER SYSTEM [0002]

The present invention relates to a hybrid power system combining a renewable energy source, an engine generator, a battery, and the like.

Because there is no commercial power system in the remote or island area, most diesel generators will supply electric power, and hybrid or hybrid electric power storage devices such as solar power, wind power, and battery are combined for reducing fuel cost, emission gas reduction, The power grid is composed of a micro grid.

The hybrid power supply system according to the related art is divided into a direct current common rail type and an alternating current common rail type according to a method of coupling an energy source.

In order to reduce or minimize the dependence of diesel generators on a stand-alone power supply, DC hybrid common-line hybrid systems, which are one of the conventional technologies, have installed renewable energy generation facilities such as solar or wind power generators of sufficient capacity, DC power converter to convert the DC power stored in the battery into AC power. Then, an uninterruptible power supply (UPS), which is a unidirectional DC-AC power conversion device, is installed in the battery, It is a way to supply.

FIG. 1 is a configuration diagram of a diesel-solar-wind-power-battery hybrid power system of a direct current common bus system according to the related art.

1, the conventional hybrid power system of the DC common bus system shown in FIG. 1 is composed of a solar power generator 2, a power conversion device 6 for solar power generation, a wind power generator 3, A power converter 7 and a battery 4 are connected to a DC common bus 8 and a unidirectional uninterruptible power supply 9 for converting a DC into an AC is provided in the DC common bus 8, And supplies power to the load 20.

The diesel generator 1 is connected to the automatic switch 10 so that the diesel generator 1 is switched to the output AC power supply in case of failure of the uninterruptible power supply 9 and supplies power to the load 20. Therefore, the power of the diesel generator 1 and the power of the uninterruptible power supply 9 can not be operated in parallel, and power is supplied to the load 20 only by one of the two power sources.

1, when the renewable energy such as sunlight or wind power can not generate sufficient electric power because of a weather condition, the diesel generator 1 is operated and a separately installed rechargeable battery ( 4) to continuously supply power to the diesel generator 1 or to operate the diesel generator 1 and to transfer the power to the uninterruptible power supply unit 9 and the automatic transfer switch 10 to supply power to the load 20 .

The advantage of this method is that since the large-capacity battery 4 is installed in the DC common bus line, there is no need for special control for eliminating the intermittency of the renewable energy and the imbalance of supply and demand. The output of the new and renewable energy sources 2 and 3 is charged by the battery 4 and the load 20 is supplied to the uninterruptible power supply 9 by the battery 4 when the capacity of the battery 4 is sufficiently large, Because it is followed by. When the voltage of the battery 4 rises due to the decrease of the load 20, the power converters 6 and 7 of the renewable energy sources 2 and 3 are designed so that the output is automatically reduced so that they are no longer charged. And the diesel generator 1 is operated to charge the battery 4 when the voltage of the battery 4 is low due to the lack of energy production of the renewable energy sources 2 and 3.

However, the disadvantage of this method is that when the uninterruptible power supply 9 that converts the DC power output to the DC common bus line to AC power and supplies the load to the load is limited by the power supply capacity to the load 20, There is a problem that the power supply from the entire power supply system to the load is interrupted and the reliability of the power supply is low when a failure occurs in the uninterruptible power supply 9. [ Such an improvement of the problem is an AC common linear hybrid power system.

FIG. 2 is a diagram showing a configuration of a conventional diesel-solar-wind-power-battery hybrid power system of an AC common bus system.

2, the hybrid power system of the AC common bus system according to the related art includes a solar power generator 2 and a power conversion device 16 for solar power generation, a wind power generator 3, and a power conversion device for wind power generation And the diesel generator 1 are all connected to the AC common bus line 32. The load 20 is connected to the AC common bus line 32, So that AC power is supplied.

1 differs from the configuration of the DC common bus line hybrid power system shown in FIG. 1 in that a power conversion device 16 for solar photovoltaic power generation connected to the solar power generator 2, a power conversion device for wind power generation connected to the wind power generator 3 The device 17 and the power conversion device 18 for a battery connected to the battery 4 are all DC-AC power conversion devices.

Particularly, when the surplus electric power is generated in the alternating current common bus line 32, the power inverter 18 for the battery 4 stores it in the accumulator battery or when the alternating current common bus line 32 is short of electric power, It is necessary to be able to perform bi-directional operation capable of discharging the stored electric power to the AC common bus line 32. In the case where the diesel generator 1 is operated, the grid-connected operation must be performed. Which is capable of constant voltage-constant frequency operation.

The hybrid power supply system shown in FIG. 2 is a system in which both an energy storage device such as solar light, wind power, a battery, and a diesel generator are connected to the AC common bus line 32, Is designed to be capable of selectively maintaining the voltage and frequency of the system constant with the diesel generator 1 by using a bi-directional power conversion device.

The advantage of this method is that all the energy sources are linked to the AC common bus 32, so that even if a problem occurs in one of the energy generators, power is supplied from other energy generators, , It is easy to increase the capacity according to the increase of the load, and the backup operation of the diesel generator 1 is possible without a separate switching device.

However, the disadvantage of this method is that the balance control of demand and supply may be excessively unstable, and particularly when the diesel generator 1 is operating as a master, it may cause a sudden decrease in load or an increase in the output of renewable energy sources The diesel generator (1) may be tripped if countermeasures are taken to reverse it and if appropriate action is not taken to reduce it. In order to solve such a surplus power problem, a separate power management system may be used to apply a dummy load or to limit the output of a renewable energy source.

An object of the present invention is to provide a DC-AC common linear hybrid power supply system capable of solving the problems of the power supply system of the DC common bus system and the power supply system of the AC common mode system.

According to a preferred embodiment of the present invention, a first distributed generator and a first energy storage means are connected to a DC common bus, A direct current common bus power system which is generated and outputted from the direct current common bus line or the direct current power discharged from the first energy storage means and outputted to the direct current common bus line to AC power and outputs the AC power; And an AC common bus power system in which the DC common bus power system, the second distributed generator, and the second energy storage means are connected to the AC common bus and supply the power output to the AC common bus to the load.

Further, the DC common bus line power supply system may include: the first distributed generator; A first power converter for converting the power generated by the first distributed generator to a DC power of a predetermined level and outputting the DC power to the DC common bus; First energy storage means connected to the DC common bus and charged with electric power generated by the first distributed generator and discharging the charged electric power through the DC common bus; And a DC-AC power conversion device for converting the DC power output from the first power conversion device or the first energy storage device to the DC common bus line into AC and outputting the AC power to the AC common bus line.

The AC common bus power system may further include a second distributed generator including a fuel generator connected to the AC common bus by switching the renewable energy source and the switch; A second power converter for converting the power generated from the renewable energy power source to a DC power of a predetermined level and outputting the DC power to the AC common bus; A digital integrated control device for controlling the switching of the switch so that the voltage, frequency, and phase of the alternator common bus with the fuel generator coincide within a predefined tolerance range; And the second energy storage means connected to the AC common bus and charged with the renewable energy power or the power generated from the fuel generator, and discharging the charged electric power through the AC common bus.

The DC-AC common linear hybrid power system may further include: an output current detector for measuring currents input from the DC common bus power system, the second power inverter, and the AC common bus from the fuel generator; A load current detector for detecting a current output to a load connected to the AC common bus; And a voltage detector for measuring a voltage of the AC common bus line.

In addition, the DC-AC common linear hybrid power supply system may further include a DC common bus line power supply system, a DC common bus line power supply system, and a DC power supply system using the current value input from the output current detection unit and the load current detection unit, The power of the regenerative energy and the state of the fuel generator are monitored to detect the occurrence of a fault, and when it is determined that a failure has occurred, the output of the first dispersed generator and the second dispersed generator is limited, Or to charge or discharge the second energy storage means.

Also, the power management system may communicate with the energy management system through a wired / wireless communication network, and the energy management system may be configured to control the operation mode, the power generation amount, the load amount, and the output current detection unit of the first distributed generator and the second distributed generator, A first communication unit for providing status information including at least one of a measured current value, a current value measured at the load current detecting unit, and a voltage value detected at the voltage detecting unit, and receiving a control command from the energy management system; Receiving the status information of the distributed generators from the power conversion apparatuses included in the DC common bus line power system and the AC common bus line power system and outputting a control command to the DC common bus line power system and the AC common bus line power system, A second communication unit for controlling the common bus line power system and the AC common bus line power system; And a control unit for receiving the current value from the output current detection unit and the load current detection unit and receiving the voltage value of the AC common bus line from the voltage detection unit to calculate the power generation amount of the distributed generators and the power amount of the load, An analog input unit for detecting a failure of the distributed generators; An analog output unit for outputting an analog control command instructing charging or discharging to the first energy storing unit and the second energy storing unit to compensate for disturbance including load fluctuation and tripping of distributed generators; And a digital input / output unit for outputting a control command instructing input and shutdown of the dummy load depending on whether or not surplus electric power is generated and detecting a failure of the distributed generators by reading the contact output according to the failure of the renewable energy sources can do.

In addition, the DC-AC common linear hybrid power system is connected to the power management system and an administrator terminal of a remote location via a wired / wireless communication network, and the DC-AC common linear hybrid power system, based on the information received from the power management system, The power generation system, the power management system, the power management system, the power management system, the power management system, and the power management system, To the power management system to control the DC-AC common linear hybrid power system.

In addition, the first distributed generator and the second distributed generator may include at least one of a solar generator and a wind turbine generator.

The present invention adopts a DC-AC common linear hybrid power supply system that combines a DC common power supply system and an AC common power supply system in the configuration of a stand-alone hybrid power supply system, Disadvantages and AC Overcomes the drawbacks of common-mode power systems.

More specifically, the present invention relates to a method of controlling a DC common power supply system, which is coupled to an alternating current common bus, so that, even when a power supply source of a DC common power supply system is stopped or a failure occurs, Since the power is supplied from the generator to the load, the power supply can be made more reliable because no power failure occurs.

Further, the present invention basically operates by supplying the power from the DC common power supply system to the load side and operating the AC common power supply system equipped with the diesel generator as the secondary energy supply means corresponding to the increasing / decreasing load, It is possible to eliminate the problem caused by generation of reverse power while facilitating expansion or contraction of the supply capacity of the system in response to load fluctuation or continuous load increase or decrease and also to connect the diesel generator to the AC common power supply system, It is not necessary to install an automatic charger and an automatic transfer switch for switching the power supply, so that the initial investment cost can be reduced.

FIG. 1 is a configuration diagram of a diesel-solar-wind-power-battery hybrid power system of a direct current common bus system according to the related art.
FIG. 2 is a diagram showing a configuration of a conventional diesel-solar-wind-power-battery hybrid power system of an AC common bus system.
FIG. 3 is a diagram showing only the connection configuration of the DC common power line type power supply system and the AC common power line type power supply system among the DC-AC common type hybrid power supply system according to the preferred embodiment of the present invention.
FIG. 4 is a diagram illustrating the overall configuration of a DC-AC common linear hybrid power supply system according to a preferred embodiment of the present invention shown in FIG.
5 is a diagram showing an actual configuration example of a DC-AC common linear hybrid power supply system according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 3 is a diagram showing only the connection configuration of the DC common power line type power supply system and the AC common power line type power supply system among the DC-AC common type hybrid power supply system according to the preferred embodiment of the present invention.

3, a DC-AC common linear hybrid power system according to a preferred embodiment of the present invention includes a plurality of distributed generators (including a solar generator 2 and a wind turbine 3) and a battery 4, (A solar power generator 2-1, a wind power generator 3-1, and a diesel generator 1) including a plurality of distributed generators (a solar power generator 2-1 and a wind power generator 3-1) And a second power system 71 including an AC common linear hybrid power supply system including a battery 4-1. The first power system 70 is connected to the alternating current common bus 32 so that the first power system 70 and the second power system 71 are connected to each other.

The diesel generator 1 installed in the DC common bus power system in the prior art shown in FIG. 1 is installed in the second power system 71, which is an AC common bus power system in the preferred embodiment of the present invention, The photovoltaic generators 2 and 2-1, the wind power generators 3 and 3-1 and the storage batteries 4 and 4-1 may be installed in the first power system 70 and the second power system 71, respectively , Or may be selectively installed in only one of them.

However, even in the same type of renewable energy source, there is a difference in the capacity provided in the first power system 70, which is a DC common bus line power system, and the second power system 71, which is an AC common bus line power system, Because the first power system 70, which is a bus power system, takes charge of the base load and performs an energy storage function of surplus power and reduces the instability of the power supply system, This is because the capacities of the generators 2 and 3 and the battery 4 are designed to be larger than the capacity provided in the second power system 71 as the AC common bus power system.

The distributed generators 1, 2-1 and 3-1 of the second power supply system 71 are installed at a minimum capacity corresponding to the peak load and are connected to the diesel generator 1 and the battery system 4-1, 18 may be designed to have a sufficient capacity to be available for backup in the event of failure of the first power system 70, which is a DC common bus system.

Referring to FIG. 3, the first power system 70 includes a solar generator 2 for converting solar energy into electric energy, a direct current (DC) power source suitable for storing the DC power input from the solar generator 2, A wind power conversion device 7 for converting AC power output from the wind power generator 3 into direct current power, a solar power generator 2, A DC-AC power conversion device 9-1 for converting the DC power stored in the storage battery into AC power and outputting the AC power to the AC common bus 32, And a DC common bus line 8 to which the solar power conversion control device 6, the wind power conversion device 7, the storage battery 4 and the DC-AC power conversion device 9-1 are interconnected .

On the other hand, the second power supply system 71 includes a solar power converter 16 for converting the DC power generated by the solar generator 2-1 and the solar generator 2-1 to AC power, A wind power converter 17, a battery 4-1 and a solar generator 2-1, which convert and output the voltage of the AC power generated by the generator 3-1 and the wind power generator 3-1, A battery power converter 18 that converts the power generated by the wind power generator 3-1 and stores it in the battery 4-1 or outputs the power stored in the battery 4-1 to the AC common bus 32, And the power conversion devices 16, 17, 18 are connected to the alternating current common bus 32. The power conversion devices 16,

The diesel generator 1 is connected to the AC common bus line 32 through the switch 31 and the switch 31 is switched by the digital integrated control device 30 so that the electric power generated by the diesel generator 1 To the alternating common bus 32 or to stop providing power.

As described above, in the power supply system of the present invention, the first power supply system 70 primarily supplies power to the load, and the solar power generator 2, the wind power generator (not shown) included in the first power system 70 3 and the battery 4 can not be continuously supplied to the load 20. [ This is because natural conditions are not always constant and the capacity of the battery 4 is limited. In addition, even when the output of the renewable energy power source is sufficient, there is a case that the operation of the diesel generator 1 is required due to the difference between the power generation and the load consumption. In this case, the diesel generator 1 is started, and the generated electric power of the diesel generator 1 is supplied to the AC common bus line 32, in which the power conversion device 18 connected to the battery 4-1 maintains the voltage and frequency The digital integrated control device 30 is required for this purpose. The digital integrated control device 30 functions to reduce the transient shock by switching the switch 31 by matching the voltage, frequency, and phase of the activated diesel generator 1 with the AC common bus 32 within the allowable range.

FIG. 4 is a diagram illustrating the overall configuration of a DC-AC common linear hybrid power supply system according to a preferred embodiment of the present invention shown in FIG.

The DC-AC common linear hybrid power system according to the preferred embodiment of the present invention includes a power management system (PMS) 59 and a power management system (PMS) 59 in the first power system 70 and the second power system 71 shown in FIG. An energy management system (EMS) 50 is coupled to control the first power system 70 and the second power system 71.

The energy management system 50 is connected to the power management system 59 and the remote administrative terminal 84 via a wired / wireless communication network. Based on the information received from the power management system 59, the energy management system 50 performs functions such as storing operation data of the power supply system of the present invention, estimating the amount of generated power and load, generating power generation plan, And transmits the control command to the power management system 59 to control the entire power system when the specific command is received from the administrator terminal 84. [ In addition, the energy management system 50 monitors the charged state of the batteries 4, 4-1 to limit the output of the distributed generation sources, or controls the energy demand of the entire power system such as charging control using the diesel generator 1 Manage the supply.

Here, the administrator terminal 84 may be implemented as a computer, a smart phone, a smart pad, or the like, which can be connected to the energy management system 50 through a wired / wireless communication network.

The power management system 59 communicates with the energy management system 50, the power conversion devices 6, 7, 9, 16, 17, 18 and the digital integrated control device 30 in a wired or wireless manner, And controls the overall function of the DC-AC common linear hybrid power system of the invention.

The power management system 59 includes a first communication unit 81, a second communication unit 82, an analog input unit (ADC) 57, an analog output unit (DAC) 60 And a digital input / output unit (DIO) 62. The components are interlocked with a control unit (not shown) included in the power management system 59 to control the power supply system of the present invention.

The first communication unit 81 communicates with the energy management system 50 via the wired / wireless communication network and informs the energy management system 50 of the status information of the entire power system (current operation mode, generation amount, A measured current value, a voltage value, etc.) and receive a control command from the energy management system 50. [

The second communication unit 82 is connected to the power conversion apparatuses 6, 7, 9, 16, 17, 18 included in the first power system 70 and the second power system 71 and the digital integrated controller 30, And controls the first power system 70 and the second power system 71 by receiving status information of distributed generators from the power converters and outputting a control command.

The analog input unit (ADC) 57 receives the current values measured by the output current detection units 51, 52, 54, and 55 and the load current detection unit 56 and detects the voltage of the AC common bus line measured by the voltage detection unit 53 Enter the value. The power management system 59 calculates the power generation amount of each distributed generator and the amount of power of the load using the measured current value and the measured voltage value information input to the analog input unit 57. By monitoring the output current and the load current, the power management system 59 monitors the instability of the AC common bus 32 and quickly detects the generation of reverse power due to the sudden change of the load and the distributed generators, and failure of the distributed generators .

The analog output unit (DAC) 60 outputs an analog control command for instructing charging or discharging to an energy storage device such as the battery 4 or 4-1, Disturbance can be compensated.

When the surplus power is generated, the digital input / output unit (DIO) 62 outputs a control command instructing the input of the dummy load 63. When the generation of the surplus power is stopped, the dummy load 63 is cut off And outputs the control command to instruct the distributed generators to detect the failure of the distributed generators without depending on the communication by reading the contact outputs according to the failures of the distributed generators.

By including such components, the power management system 59 can monitor the system state change in real time, and can take action in real time with no time delay for the state change.

Specifically, the power management system 59 of the present invention is configured to calculate the power of each of the distributed generators 1, 2-1, 3 (1, 2, 3) from the current information input from the output current detecting portions 51, 52, 54, 55 and the load current detecting portion 56 -1 and 4-1 and the first power system 70 and monitors the states of the first power system 70 and the second power system 70 so as to monitor the states of the load 20 and the distributed generators 1, 2-1, 3-1, And the failure of the distributed generators 1, 2-1, 3-1, and 4-1.

The power management system 59 is also connected to the battery power conversion device 18 when the generation of a problem in the system such as reverse power generation in the first power system 70 or the second power system 71, The dummy load 63 is charged or discharged by charging or discharging the battery 4-1 by transmitting a control command or by transmitting a control command through the digital input and output unit 62 or by switching the second communication unit 82 And outputs the control command to limit the output of each of the distributed generators 16 and 17, independently of the energy management system 50.

5 is a diagram showing an actual configuration example of a DC-AC common linear hybrid power supply system according to a preferred embodiment of the present invention.

5, a first power system 70, which is a DC common bus system, includes a solar power generator 2 and its power converter 6, a solar power generator 2 And a DC-AC power converter 9-1 composed of a battery 4 for storing electric power and capable of bidirectional operation (charging or discharging) and both mode operation (grid connection operation or independent operation).

The second power system 71 which is an AC common bus system includes a diesel generator 1, a solar generator 2-1 and its power converter 16, a diesel generator 1 and a solar generator 2-1, And the power conversion device 18 of the first power system 70. The power conversion device 9-1 of the first power system 70 is constituted by the second power system 71 The first power system 70 is coupled to the second power system 71. The first power system 70 is coupled to the second power system 71,

Assuming that the average load is 30 kW, the maximum load is 60 kW, and the minimum load is 10 kW, the daily required power is 30 kW x 24 hours = 720 kWh. When 50% of the power is supplied from the solar power, 100kWp of photovoltaic power generation is needed. In this case, 70 kW is allocated to the solar power generator 2 and the power converter 6, and 30 kW is allocated to the solar power generator 2-1 and the power converter 16. The battery (4) is selected as a lead-acid battery with sufficient capacity considering the backup time and cost, the power converter (9-1) is designed to be 50 kW, the battery (4-1) is designed to be used for backup and nighttime base load A lithium battery can be used, and the power converter 18 is designed to have the same 50 kW for backup of the battery power converter 9-1 of the DC common bus 8. The diesel generator (1) selects 100 kW for the purpose of supplying backup power and 50% of load power.

In this case, it is possible to cope with a load of up to 130 kW without operation of the diesel generator 1, and even when a failure occurs in the DC common bus 8 and the power supply from the first power system 70 is interrupted, It can be designed as a system capable of supplying power up to 180 kW.

The 30-kW photovoltaic power generation of the AC common bus line 32 is used for the base load at the time of day and is used for charging the battery 4-1 and the photovoltaic generators 2-1, 16 and the battery storage devices 4-1, 18 operate in conjunction with the power conversion device 9-1 of the DC common bus 8 that performs the master operation.

The power management system 59 receives the output currents of the distributed generators 1 and 2-1 from the output current detection units 51 and 52 and receives the load current from the load current detection unit 56, The power supply system can continuously monitor the state of the power system by always monitoring the system voltage by receiving the voltage value from the power supply unit 53. The power management system 59 is connected to the main distributed generators 1, 2 and 2-1 via the communication network 83 and further transmits and receives information to and from the energy management system 50 via the communication network 80 . The power management system 59 detects the output current of the distributed generator and detects the failure of the device or the instability of the system voltage and takes necessary measures.

For example, when a failure of the power conversion apparatus 9-1 of the DC common bus system 70 is detected, that is, when an overcurrent or zero current is detected in the output current detection unit 51, the power management system 59 It is possible to promptly operate, without regard to the energy management system 50, to operate in the stand-alone operation mode for maintaining the system master, that is, the voltage and the frequency, by the power conversion device 18 for battery of the AC common bus system 71, It is possible to maintain.

This mode conversion information is transmitted to the energy management system 50, which allows the energy management system 50 to take follow-up action according to the demand and supply necessity of the electric power such as the operation of the diesel generator 1 as necessary.

As another example, if it is detected that the amount of power consumption of the load exceeds the capacity of the power inverter 9-1 of the DC common bus system 70 due to an abrupt increase in the load 20, Can respond to a transient peak load by providing a maximum discharge command to the power converter (18) for a battery of the AC common bus system (71). Even in this case, such situation information is transmitted to the energy management system 50, and follow-up measures such as operating the diesel generator 1 as required can be taken.

The energy management system 50 stores and manages operation data received from the power management system 59 and uses the data to perform energy management functions such as load prediction, solar and wind power generation prediction, and power generation plan. The energy management system 50 can be remotely monitored and controlled by an administrator terminal through the Internet 84 and also receives weather information for predicting the output of renewable energy.

The present invention has been described with reference to the preferred embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

1: Diesel generator 2, 2-1: Solar generator
3, 3-1: Wind turbine generator 4, 4-1: Storage battery
8: DC common bus 9-1: DC-AC power converter
6, 7, 9, 16, 17, 18: power conversion device
20: load 30: digital integrated control device
32: AC common bus 50: Energy management system
51, 52, 54, 55: an output current detecting section
53: voltage detection unit 56: load current detection unit
57: analog input unit 59: power management system
60: analog output section 63: dummy load
62: digital input / output unit 70: first power system
71: second power supply system 81: first communication section
82: second communication unit 84:

Claims (8)

The first distributed generator and the first energy storage means are connected to a DC common bus and the DC power generated from the first distributed generator and outputted to the DC common bus or the first power stored in the DC common bus DC common bus power system that converts the output DC power into AC power and outputs it; And
An AC common bus power system in which the DC common bus power system, a second distributed generator, and a second energy storage means are connected to an AC common bus and supplies power output to the AC common bus,
The DC common bus power system
The first distributed generator;
A first power converter for converting the power generated by the first distributed generator to a DC power of a predetermined level and outputting the DC power to the DC common bus;
First energy storage means connected to the DC common bus and charged with electric power generated by the first distributed generator and discharging the charged electric power through the DC common bus; And
And a DC-AC power conversion device for converting the DC power output from the first power conversion device or the first energy storage device to the DC common bus line into AC and outputting the AC power to the AC common bus line,
The AC common bus power system
The second distributed generator including a fuel generator connected to the AC common bus by switching the renewable energy generator and the switch;
A second power converter for converting the power generated by the renewable energy generator into a DC power of a predetermined level and outputting the DC power to the AC common bus;
A digital integrated control device for controlling the switching of the switch so that the voltage, frequency, and phase of the alternator common bus with the fuel generator coincide within a predefined tolerance range; And
And second energy storage means connected to the AC common bus and charged with electric power generated in the renewable energy generator or the fuel generator and discharging the charged electric power through the AC common bus,
DC-AC common linear hybrid power system
An output current detector for measuring a current input from the DC common bus power system, the second power converter, and the AC common bus from the fuel generator;
A load current detector for detecting a current output to a load connected to the AC common bus;
A voltage detector for measuring a voltage of the AC common bus line; And
Wherein the state of the DC common bus line power system, the renewable energy generator, and the fuel generator is monitored using a current value input from the output current detection unit and the load current detection unit and a voltage value input from the voltage detection unit, And to limit the output of the first distributed generator and the second distributed generator, to charge or discharge the dummy load, or to charge or discharge the second energy storage means Further comprising a power management system for controlling the power management system,
Wherein the capacity of said first distributed generator and said first energy storage means is greater than the capacity of said second distributed generator and said second energy storage means such that said DC common bus line power system is responsible for a base load. AC common linear hybrid power system. delete delete delete delete The system of claim 1, wherein the power management system
And a control unit that controls the energy management system to communicate with the energy management system through the wired / wireless communication network, wherein the energy management system is operable to control the operation modes and the power generation amount and the load amount of the first distributed generator and the second distributed generator, A first communication unit for providing status information including at least one of a current value measured at the detecting unit and a voltage value detected at the voltage detecting unit and receiving a control command from the energy management system;
Receiving the status information of the distributed generators from the power conversion apparatuses included in the DC common bus line power system and the AC common bus line power system and outputting a control command to the DC common bus line power system and the AC common bus line power system, A second communication unit for controlling the common bus line power system and the AC common bus line power system;
And a control unit for receiving the current value from the output current detection unit and the load current detection unit and receiving the voltage value of the AC common bus line from the voltage detection unit to calculate the power generation amount of the distributed generators and the power amount of the load, An analog input unit for detecting a failure of the distributed generators;
An analog output unit for outputting an analog control command instructing charging or discharging to the first energy storing unit and the second energy storing unit to compensate for disturbance including load fluctuation and tripping of distributed generators; And
And a digital input / output unit for outputting a control command for instructing input and shutdown of the dummy load depending on whether redundant power is generated and for detecting a failure of the distributed generators by reading a contact output according to a failure of the renewable energy sources And a DC-AC common linear hybrid power system. The method according to claim 1,
AC power supply system is connected to the power management system and a manager terminal of a remote location through a wired / wireless communication network, and is configured to store operation data of the DC-AC common linear hybrid power system based on information received from the power management system, Plan generation and report generation functions, and provides the generated information to the administrator terminal. Upon receiving a specific control command from the administrator terminal, the control command is transmitted to the power management system to receive the control command, Further comprising an energy management system for controlling the linear hybrid power system. The method according to claim 1,
Wherein the first distributed generator and the second distributed generator include at least one of a solar generator and a wind turbine generator.

Images