Power supply system and power supply method

Abstract

Provided is, inter alia, a power supply system that contributes to the stability of a power system. The power supply system (E1) comprises a control means (7) for using, as on-site power to be used in a motor (5a) or other load (5b) during the ordinary operation of a nuclear power plant (100) that generates power by using a main power generator (1), which is a synchronous power source, at least some power generated at a solar power plant or wind power plant that generates power by using an asynchronous power source. The control means (7) uses at least some of the power generated at a solar power plant or wind power plant for the on-site power during the ordinary operation of the nuclear power plant (100), thereby reducing the on-site consumption rate of the nuclear power plant (100).

Description

[Technical Field]

[0001] The present invention relates to a power supply system and the like. [Background technology]

[0002] Regarding power supply to power generation facilities, for example, Patent Document 1 describes that in the event of an emergency such as a loss of external power supply at a nuclear power generation facility, the electricity generated by solar power generation facilities and wind power generation facilities that has been stored in advance in a power storage facility will be supplied to the nuclear power generation facility as an emergency power source. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2021-132472 Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, the power supplied from a generator connected to a turbine to an external power system has so-called inertial force and synchronizing force, and therefore often contributes to the stabilization of the external power system. In the technology described in Patent Document 1, during normal operation of a nuclear power plant, the power supplied from the nuclear power plant to the external power system is the amount of power remaining after subtracting the power consumed within the plant. There is room for more effective use of the power generated by the nuclear power plant (power generated having inertial force and synchronizing force) to stabilize the external power system, but Patent Document 1 does not describe such technology.

[0005] Therefore, an object of the present invention is to provide a power supply system or the like that contributes to stabilizing the power system. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the power supply system according to the present invention generates power using a synchronous power supply. and supplying power to the power grid via a first transmission line. No. 1 Power Plant and the generated power of Generate electricity using asynchronous power sources and supplying power via a second transmission line independent of the first transmission line. Second Power Plant and the second power plant as the on-site power used for on-site loads during normal operation of the first power plant. and a control means for using at least a portion of the generated power. The control means controls so that during normal operation of the first power plant, active power not including reactive power is supplied from the asynchronous power source to the on-site load via the second transmission line, and when reactive power is insufficient in the on-site load, the synchronous power source or the power system supplies the insufficient reactive power to the on-site load via a power line branching off from the first transmission line. It was decided that. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a power supply system that contributes to stabilizing the power system. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is an explanatory diagram of a power supply system according to a first embodiment. [Figure 2] 1 is a configuration diagram including a nuclear power plant of a power supply system according to a first embodiment. [Figure 3] FIG. 10 is a configuration diagram including a nuclear power plant of a power supply system according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] First Embodiment <Power supply system configuration> FIG. 1 is an explanatory diagram of a power supply system E1 according to the first embodiment. Note that solid arrows in Fig. 1 indicate the transmission of AC power (AC power transmission). Furthermore, white arrows in Fig. 1 indicate the transmission of DC power (DC power transmission). As shown in Fig. 1, the power supply system E1 is configured to include a nuclear power plant 100 (first power plant), solar power plants 201 and 202 (second power plants), and a wind power plant 203 (second power plant).

[0010] The nuclear power plant 100 (first power plant) is a facility that generates electricity using a "synchronous power source." Here, a "synchronous power source" is a generator configured to convert the kinetic energy of a turbine (not shown) into electrical energy. The power (AC power) generated by the nuclear power plant 100 is supplied to a power grid G1. In FIG. 1, the nuclear power plant 100 is shown as an example of a "first power plant" that generates electricity using a "synchronous power source," but the "first power plant" is not limited to this. For example, a thermal power plant or a hydroelectric power plant may also be used as the "first power plant."

[0011] The power generated by a "synchronous power source" has what is called inertia, so even if the voltage or frequency is disturbed due to a malfunction in power system G1, it can suppress instantaneous voltage drops and sudden fluctuations in frequency. In addition, a "synchronous power source" has the property of trying to rotate at the same rotational speed as other synchronous power sources connected to power system G1 (synchronizing force), which contributes to the stabilization of power system G1.

[0012] The solar power plants 201 and 202 (second power plants) and the wind power plant 203 (second power plant) shown in FIG. 1 are facilities that generate power using an "asynchronous power source." Here, an "asynchronous power source" is a power generation facility that performs power conversion so as to follow changes in the voltage of the power grid G1. In FIG. 1, the solar power plants 201 and 202 and the wind power plant 203 that use renewable energy are shown as examples of the "second power plant" that generates power using an "asynchronous power source," but the "second power plant" is not limited to this. For example, the "second power plant" may be a power generation facility that uses biomass power generation or temperature difference power generation.

[0013] A portion of the power generated by the solar power plants 201, 202 and the wind power plant 203 is supplied to the power grid G1, as indicated by the solid arrows in Fig. 1. That is, when the power generated by the solar power plants 201, 202 and the wind power plant 203 is supplied to the power grid G1, the generated power is converted into predetermined AC power by an inverter (not shown) so as to follow changes in the voltage of the power grid G1. In this way, since "asynchronous power sources" have almost no inertial force or synchronizing force like "synchronous power sources," the stability of the power grid G1 tends to decrease as the number of "asynchronous power sources" connected to the power grid G1 increases.

[0014] In conventional power supply systems, during normal operation of a power plant that generates power using a "synchronous power source," part of the power generated by the power plant is used to supply power to on-site loads (pumps, air conditioning equipment, etc.: not shown). When part of the power generated by the "synchronous power source" is used for on-site loads in this way, the amount of power generated and supplied to the power grid G1 from the "synchronous power source" decreases accordingly.

[0015] Therefore, in the first embodiment, the control means 7 (see FIG. 2 ) uses at least a portion of the power generated by the photovoltaic power plants 201, 202 (second power plants) and the wind power plant 203 (second power plant), which generate power using "asynchronous power sources," as the on-site power to be used for on-site loads during normal operation of the nuclear power plant 100 (first power plant), which generates power using "synchronous power sources." This makes it possible to reduce the "on-site ratio" of the nuclear power plant 100 (first power plant). The "on-site ratio" is the ratio of power generated by the "synchronous power sources" that is used as the on-site power of the nuclear power plant 100 (first power plant). The lower the "on-site ratio" of the nuclear power plant 100, the higher the ratio of power generated by the "synchronous power sources" of the nuclear power plant 100 that is supplied to the power grid G1, thereby improving the stability of the power grid G1.

[0016] As shown by the white arrows in Fig. 1, part of the power generated by solar power plants 201, 202 (second power plants) and wind power plant 203 (second power plant) is supplied to nuclear power plant 100 (first power plant) via DC power transmission. The DC power supplied to the nuclear power plant 100 from the solar power plants 201, 202, etc. is converted to AC power by inverter 6 shown in Fig. 2 below, and the converted AC power is supplied to the loads within the nuclear power plant 100 (electric motor 5a and other loads 5b: see Fig. 2).

[0017] FIG. 2 is a configuration diagram of the power supply system E1 including the nuclear power plant 100. 2 correspond to the power generation facilities of the solar power plants 201 and 202 (see FIG. 1) and the wind power plant 203 (see FIG. 1). As shown in FIG. 2, the nuclear power plant 100 includes a main generator 1 (synchronous power supply), circuit breakers 2a to 2f, transformers 3 and 4, an electric motor 5a (station load), other loads 5b (station load), an inverter 6, a control means 7, and a power storage facility 8.

[0018] The main generator 1 is a generator that generates electricity by rotating a turbine or the like (not shown). In the case of a boiling water reactor in the nuclear power plant 100, for example, water is boiled using heat generated by nuclear fission of uranium fuel or the like, and the energy of the resulting steam rotates a turbine (not shown), causing the main generator 1 connected to the turbine to generate electricity. Note that a pressurized water reactor or other types of power generation equipment may also be used as the nuclear power plant 100. The generated electric power (AC power) of the main generator 1 is supplied to an electric power system G1 via a power transmission line P1, a circuit breaker 2a, and a power transmission line P2 in this order.

[0019] The circuit breaker 2a switches between connection and disconnection between the main generator 1 and the power grid G1. The transformer 3 is a device that adjusts the level of AC voltage when part of the power generated by the main generator 1 is supplied to the electric motor 5a and other loads 5b. The primary side of the transformer 3 is connected to the transmission line P2, and the secondary side is connected to the power line K1 via the circuit breaker 2b. The circuit breaker 2b switches between connection and disconnection between the transformer 3 and the power line K1.

[0020] The electric motor 5a is one of the "in-plant loads" of the nuclear power plant 100, and is connected to the electric power line K1 via a circuit breaker 2c. The circuit breaker 2c switches between connection and disconnection between the electric motor 5a and the electric power line K1. The "station load" refers to equipment used in the operation of the nuclear power plant 100 (equipment that consumes station power). In the nuclear power plant 100, the "station load" includes, for example, a pump that circulates cooling water used to cool fuel rods (not shown), a pump (not shown) that circulates water through a condenser (not shown), air conditioning equipment (not shown), sensors (not shown), and control devices (not shown). In FIG. 2, such station loads are schematically shown as electric motors 5a and other loads 5b.

[0021] The other loads 5b are predetermined devices included in the "station loads" and are connected to the power line K1 via the transformer 4 and the circuit breaker 2d in this order. The transformer 4 is a device that adjusts the voltage level of predetermined AC power output from the inverter 6 (or AC power supplied via the transformer 3). The primary side of the transformer 4 is connected to the power line K1 via the circuit breaker 2d, and the secondary side is connected to the other loads 5b. The circuit breaker 2d switches between connection and disconnection between the power line K1 and the transformer 4.

[0022] The asynchronous power supply 21 shown in Fig. 2 is, for example, a solar power generation panel of a solar power plant 201 (see Fig. 1), and is connected to the input side of an inverter 6 via power transmission lines K3 and K6 in sequence. Another asynchronous power supply 22 is, for example, a solar power generation panel of a solar power plant 202 (see Fig. 1), and is connected to the input side of the inverter 6 via power transmission lines K4 and K6 in sequence. The remaining asynchronous power supply 23 is, for example, a generator of a wind power plant 203 (see Fig. 1), and is connected to the input side of the inverter 6 via power transmission lines K5 and K6 in sequence. The wind power plant 203 (see Fig. 1) is provided with a converter (not shown) that converts AC power to DC power.

[0023] The power (DC power) generated by each of the asynchronous power sources 21 to 23 is input to the inverter 6 of the nuclear power plant 100 via a common transmission line K6. By using the common transmission line K6 in this way, the equipment costs required for the transmission line can be reduced.

[0024] The inverter 6 is a power converter that converts DC power supplied from the asynchronous power sources 21-23 into AC power. In the example of FIG. 2, the input side of the inverter 6 is connected to the power transmission line K6, and the output side is connected to the power line K1 via the circuit breaker 2e. Although not shown, the inverter 6 is configured, for example, by connecting a first leg, a second leg, and a third leg in parallel, each of which is formed by connecting two switching elements in series. The intermediate terminal of the first leg is connected to the U-phase winding, the intermediate terminal of the second leg is connected to the V-phase winding, and the intermediate terminal of the third leg is connected to the W-phase winding. Note that the configuration of the inverter 6 described above is merely an example and is not limited to this.

[0025] Although not shown, the control means 7 is configured to include electronic circuits such as a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), and various interfaces. A program stored in the ROM is read and loaded into the RAM, and the CPU executes various processes. The control means 7 has a function of controlling the on / off of each switching element (not shown) of the inverter 6 in a predetermined manner. The control means 7 may also be configured to be built into the inverter 6.

[0026] The circuit breaker 2e shown in FIG. 2 switches between connection and disconnection between the inverter 6 and the power line K1. The power line K1 and the circuit breakers 2b, 2c, 2d, and 2e connected to the power line K1 may be provided in a predetermined power panel (not shown). The power storage facility 8 is a facility for storing power, and is connected to the power transmission line K6 via the power line K2. For example, a chargeable and dischargeable secondary battery is used as the power storage facility 8, but this is not limited thereto. Alternatively, an electric double layer capacitor may be used as the power storage facility 8. As shown in FIG. 2, the power storage facility 8 is connected to the input side of the inverter 6 via the circuit breaker 2f and the power line K2 in this order. The circuit breaker 2f switches between connection and disconnection between the power storage facility 8 and the power line K2.

[0027] As described above, AC power is transmitted from the nuclear power plant 100 (first power plant) to the power grid G1. Furthermore, DC power is transmitted from the solar power plants 201, 202 (second power plants: see FIG. 1) and the wind power plant 203 (second power plant: see FIG. 1) to the nuclear power plant 100 (first power plant). By transmitting DC power in this manner, power loss associated with power transmission can be reduced compared to AC power transmission. Furthermore, even if the asynchronous power sources 21-23 are installed in remote locations, power can be transmitted to the nuclear power plant 100 with relatively little power loss. Furthermore, since there is no particular need to separately install inverters (not shown) that convert DC power to AC power in the solar power plants 201, 202 (see FIG. 1), etc., equipment costs can be reduced. The method of transmitting power from the solar power plants 201, 202 (see FIG. 1) and the wind power plant 203 (see FIG. 1) to the nuclear power plant 100 is not limited to DC power transmission, and may be, for example, AC power transmission. When AC power transmission is performed, an inverter (not shown) that converts DC power to AC power is provided in the solar power plants 201, 202 (see FIG. 1) or the like, as described above.

[0028] Furthermore, it is preferable that the power transmission lines K3 to K6 between the nuclear power plant 100 (first power plant) and the solar power plants 201, 202, etc. (second power plants: see FIG. 1) are dedicated lines. In other words, it is preferable that the power transmission lines K3 to K6 connecting the nuclear power plant 100 and the solar power plants 201, 202, etc. are not connected to the power grid G1. In this way, by making the power transmission lines K3 to K6 dedicated lines, it is possible to simplify the process of supplying the power generated by the solar power plants 201, 202, etc. to the loads within the nuclear power plant 100.

[0029] As shown in FIG. 2, a plurality of asynchronous power sources 21-23 (i.e., a plurality of second power plants) are connected to a nuclear power plant 100 (first power plant) via transmission lines K3-K6. In such a configuration, it is preferable that the voltages used when DC power is transmitted from each of the asynchronous power sources 21-23 (i.e., second power plants) to the nuclear power plant 100 (first power plant) are equal. This enables DC power transmission via the common transmission line K6, which not only simplifies the processing on the nuclear power plant 100 side but also reduces the cost required for the transmission lines. Note that the configuration of the nuclear power plant 100 shown in FIG. 2 is an example and is not limited to this.

[0030] <Processing at nuclear power plants> For example, during normal operation of the nuclear power plant 100, the circuit breakers 2a to 2f are in a closed state. Note that a predetermined control device (not shown) may be used to open and close the circuit breakers 2a to 2f, or the circuit breakers 2a to 2f may be opened and closed manually (including by operating a button) by a person. As described above, the power generated by the main generator 1 is supplied to the power system G1 via the circuit breaker 2a.

[0031] A portion of the power generated by each of the asynchronous power sources 21-23 is supplied to the nuclear power plant 100 by DC transmission via transmission lines K3-K6 (white arrows in FIG. 1), and the remainder is supplied to the power grid G1 by AC transmission via another transmission line (solid arrows in FIG. 1). The DC power supplied from the asynchronous power sources 21-23 to the nuclear power plant 100 is converted to AC power by the inverter 6, and this AC power is supplied to on-site loads such as the electric motor 5a and other loads 5b.

[0032] More specifically, the control means 7 calculates the momentary power consumption of the station loads based on the operating state of the nuclear power plant 100 (e.g., normal operation or maintenance), the specifications of the electric motor 5a and the other loads 5b, and the like. It is also possible to use detected values ​​of the current and voltage of the electric motor 5a and the other loads 5b as appropriate. The control means 7 then controls the inverter 6 in a predetermined manner so as to obtain an output of a magnitude corresponding to the power consumption of the station loads. The AC power output from the inverter 6 is supplied to the electric motor 5a via the circuit breaker 2e, the power line K1, and the circuit breaker 2c in this order, and is also supplied to the other loads 5b via the circuit breaker 2e, the power line K1, the circuit breaker 2d, and the transformer 4 in this order.

[0033] In this way, the control means 7 controls the inverter 6 to use at least a part of the power generated by the photovoltaic power plants 201, 202, etc. (second power plant: see FIG. 1) as the on-site power to be used for the electric motor 5a (on-site load) and other loads 5b (on-site load) during normal operation of the nuclear power plant 100 (first power plant). This makes it possible to increase the power generated by the asynchronous power sources 21-23 and supplied to the power system G1 by the amount corresponding to the power used as the on-site power of the nuclear power plant 100. In other words, the supply amount of generated power having inertial force and synchronizing force increases, thereby improving the stability of the power system G1.

[0034] At least a portion of the power generated by the asynchronous power sources 21-23 of the photovoltaic power plants 201, 202, etc. (second power plants: see FIG. 1) may be stored in the power storage facility 8. Then, during normal operation of the nuclear power plant 100 (first power plant), the power of the power storage facility 8 may be used as the on-site power of the nuclear power plant 100. Even with this processing, the proportion of the power generated by the main generator 1, which is a synchronous power source, that is used to supply power to on-site loads (on-site rate) is reduced, thereby stabilizing the power system G1.

[0035] Furthermore, during normal operation of the nuclear power plant 100, the main generator 1, which is a synchronous power source, may be electrically connected to the power grid G1 via a circuit breaker 2a, and may also be electrically connected to the on-site loads, such as the electric motor 5a and other loads 5b, via circuit breakers 2b, etc. In this case, during normal operation of the nuclear power plant 100, active power may be supplied to the on-site loads from the asynchronous power sources 21 to 23, and at least reactive power may be supplied to the on-site loads from the main generator 1, which is a synchronous power source (or the power grid G1).

[0036] Incidentally, the power generated by the asynchronous power sources 21-23 often contains almost no reactive power. As described above, sufficient power can be supplied to the station loads by supplying the active power and reactive power that are insufficient in the station loads, such as the electric motor 5a, from the main generator 1 (or the power system G1 during maintenance of the main generator 1). When the station loads are short of active power or reactive power, the main generator 1 (or the power system G1) automatically supplies the shortfall to the station loads, so there is no need for the control means 7 to perform any special control.

[0037] <Effects> According to the first embodiment, at least a portion of the power generated by the photovoltaic power plants 201, 202 and the wind power plant 203, which generate power using asynchronous power sources 21-23, is used as the utility power during normal operation of the nuclear power plant 100, which generates power using synchronous power sources. This reduces the proportion of the power generated by the synchronous power sources that is consumed as utility power (the utility rate), and increases the proportion of the power supplied to the power grid G1. This increases the supply of generated power that has inertial force and synchronizing force, thereby stabilizing the power grid G1. Furthermore, it becomes possible to ensure the stability of the power grid G1 even in a situation where asynchronous power sources such as renewable energy sources are increasing.

[0038] Furthermore, the power sources available to the nuclear power plant 100 include the main generator 1 and the power storage facility 8, as well as power supply from the power grid G1 and power supply from the asynchronous power sources 21-23, thereby improving the reliability of the power supply to the nuclear power plant 100. Furthermore, the transmission lines P1 and P2 used to transmit power from the main generator 1 (synchronous power source) to the power grid G1 are separate from the transmission lines K3-K6 used to transmit power from the asynchronous power sources 21-23 to the nuclear power plant 100. This prevents the effects of voltage fluctuations caused by the control of power conditioners (not shown) of the solar power plants 201, 202, etc. from spreading to the nuclear power plant 100.

[0039] Furthermore, since the nuclear power plant 100 is provided with a power storage facility 8, even if the power generated by the asynchronous power sources 21 to 23 fluctuates, it is possible to supply power from the power storage facility 8 to on-site loads such as the electric motors 5a so as to absorb the fluctuations.

[0040] Furthermore, surplus power from the power supplied to the nuclear power plant 100 from the asynchronous power sources 21-23 can be stored in the power storage facility 8, and when the power supply from the asynchronous power sources 21-23 is insufficient or when the power selling price of the asynchronous power sources 21-23 is high, the power storage facility 8 can be used to supplement the on-site power. This increases the amount of power supplied from the main generator 1 to the power grid G1, thereby improving profitability from power selling. Furthermore, there is no particular need to complicate the control in the nuclear power plant 100, which simplifies processing and reduces costs.

[0041] Second Embodiment The second embodiment differs from the first embodiment in that an energy conversion facility 9 (see FIG. 3) is provided in a nuclear power plant 100A (see FIG. 3) instead of a power storage facility 8 (see FIG. 2). The rest of the second embodiment is the same as the first embodiment. Therefore, only the parts that are different from the first embodiment will be described, and a description of the overlapping parts will be omitted.

[0042] FIG. 3 is a configuration diagram of a power supply system EA1 according to the second embodiment, including a nuclear power plant 100A. As shown in Fig. 3, the nuclear power plant 100A (first power plant) is provided with energy conversion equipment 9. The energy conversion equipment 9 has a function of converting one of predetermined energy and electrical energy into the other, and is electrically connected to the power transmission line K6 via a circuit breaker 2f. Examples of such energy conversion equipment 9 include, but are not limited to, pumped storage power generation equipment, energy conversion equipment using hydrogen gas, and flywheel batteries.

[0043] At least a portion of the power generated by the asynchronous power sources 21-23 of the photovoltaic power plants 201, 202, etc. (second power plants: see FIG. 1) may be converted into predetermined energy and stored in the energy conversion facility 9. Then, during normal operation of the nuclear power plant 100 (first power plant), the predetermined energy may be converted into power in the energy conversion facility 9, and this power may be used as the in-plant power of the nuclear power plant 100. Even with this process, the proportion of the power generated by the main generator 1, which is a synchronous power source, that is used to supply power to in-plant loads (in-plant rate) is reduced, thereby stabilizing the power system G1.

[0044] <Effects> According to the second embodiment, the nuclear power plant 100A is provided with the energy conversion facility 9. Therefore, when a malfunction occurs in the nuclear power plant 100A or when the power generated by the asynchronous power sources 21 to 23 fluctuates, it becomes possible to supply power from the energy conversion facility 9 to the on-site loads such as the electric motor 5a so as to absorb the fluctuation.

[0045] <<Variations>> Although the power supply system E1 and the like according to the present invention have been described in the above with reference to the respective embodiments, the present invention is not limited to these descriptions and various modifications can be made. For example, in each embodiment, the control means 7 has been described as using part of the power generated by the solar power plants 201, 202 (second power plants) and the wind power plant 203 (second power plant) as the on-site power during normal operation of the nuclear power plant 100 (first power plant), but this is not limiting. For example, all of the power generated by the solar power plants 201, 202, etc. (second power plants) may be used as the on-site power of the nuclear power plant 100 (first power plant).

[0046] In addition, in each embodiment, the case where two solar power plants 201 and 202 (see FIG. 1) and one wind power plant 203 (see FIG. 1) are used as the "second power plants" has been described, but the number and types of "second power plants" can be changed as appropriate. For example, the number of "second power plants" may be one or two, or may be four or more.

[0047] Furthermore, in each embodiment, the case where the control means 7 (see FIG. 2) controls the inverter 6 (see FIG. 2) has been described, but the present invention is not limited to this. That is, the control means 7 may control at least one of the circuit breakers 2a to 2f in addition to the inverter 6. Furthermore, in each embodiment, the case where the control means 7 is provided in the nuclear power plant 100 has been described, but the present invention is not limited to this. For example, a server (not shown) provided outside the nuclear power plant 100 may be configured to perform at least some of the functions of the control means 7.

[0048] In addition, in each embodiment, the case where the "first power plant" that generates power using a synchronous power supply is the nuclear power plant 100 (see FIG. 1) has been described, but this is not limiting. For example, the "first power plant" may be a thermal power plant or a hydroelectric power plant. In addition, in each embodiment, the "second power plant" that generates power using the asynchronous power sources 21 to 23 (see FIG. 2) is described as being the solar power plants 201 and 202 (see FIG. 1) or the wind power plant 203 (see FIG. 1), but this is not limiting. For example, the "second power plant" may be a power generation facility that uses biomass power generation or temperature difference power generation.

[0049] Furthermore, each embodiment has been described in detail to clearly explain the present invention, and is not necessarily limited to having all of the described configurations. Furthermore, it is possible to add, delete, or replace some of the configurations of the embodiments with other configurations. Furthermore, the above-described mechanisms and configurations are those considered necessary for explanation, and do not necessarily represent all of the mechanisms and configurations of the product. Furthermore, the power lines and signal lines shown are those that are considered necessary for the explanation, and do not necessarily show all the power lines and signal lines in the product. In reality, it can be assumed that almost all components are interconnected. [Explanation of symbols]

[0050] 1 Main generator (synchronous power supply) 2a,2b,2c,2d,2e,2f circuit breaker 3. Transformer 4. Transformers 6 inverters 7 Control Measures 5a Electric motor (in-house load) 5b Other loads (station loads) 8. Power storage facilities 9 Energy conversion facilities 21,22,23 Asynchronous power supply 100,100A Nuclear Power Plant (No. 1) 201, 202 Solar Power Plant (Second Power Plant) 203 Wind Power Plant (Second Power Plant) E1, EA1 power supply system G1 power system K3, K4, K5, K6 transmission lines (Second transmission line) P1, P2 transmission lines (First transmission line)

Claims

1. Regarding power generated by a first power plant that generates power using a synchronous power source and supplies the power to a power grid via a first transmission line, and power generated by a second power plant that generates power using an asynchronous power source and supplies the power via a second transmission line independent of the first transmission line, a control means for using at least a part of the power generated by the second power plant as utility power to be used for utility loads during normal operation of the first power plant; a power supply system characterized in that the control means controls so that, during normal operation of the first power plant, active power not including reactive power is supplied from the asynchronous power source to the on-site load via the second transmission line, and when there is a shortage of reactive power in the on-site load, the synchronous power source or the power grid supplies the shortage of reactive power to the on-site load via a power line branching off from the first transmission line.

2. The control means uses at least a portion of the power generated by the second power plant as the on-site power during normal operation of the first power plant, thereby reducing the on-site power rate at the first power plant, The station rate is the rate at which the generated power used as the station power occupies the generated power of the synchronous power source.

2. The power supply system according to claim 1, wherein:

3. AC power is transmitted from the first power plant to the power grid via the first transmission line, DC power is transmitted from the second power plant to the first power plant via the second transmission line.

2. The power supply system according to claim 1, wherein:

4. a plurality of the second power plants are connected to the first power plant via the second transmission lines; The voltages when DC power is transmitted from each of the second power plants to the first power plant are equal.

4. The power supply system according to claim 3, wherein:

5. an electric power storage facility electrically connected to the second transmission line between the first power plant and the second power plant; At least a portion of the power generated by the second power plant is stored in the power storage facility, During normal operation of the first power plant, the power stored in the power storage facility is used as the on-site power.

2. The power supply system according to claim 1, wherein:

6. an energy conversion facility electrically connected to the second transmission line between the first power plant and the second power plant; At least a portion of the power generated by the second power plant is converted into a predetermined energy source and stored in the energy conversion facility; During normal operation of the first power plant, the energy conversion equipment converts a predetermined amount of energy into electricity, and the electricity is used as the on-site electricity.

2. The power supply system according to claim 1, wherein:

7. an inverter electrically connected to the second transmission line between the first power plant and the second power plant; The control means controls the inverter so that at least a part of the power generated by the second power plant is used as the on-site power during normal operation of the first power plant.

2. The power supply system according to claim 1, wherein:

8. The power supply system includes the control means, the first power plant, and the second power plant. The power supply system according to any one of claims 1 to 7, wherein:

9. Regarding power generated by a first power plant that generates power using a synchronous power source, supplies the power to an electric power grid via a first transmission line, and supplies the power to on-site loads via a power line branching off from the first transmission line, and power generated by a second power plant that generates power using an asynchronous power source and supplies the power to the on-site loads via a second transmission line different from the first transmission line, During normal operation of the first power plant, DC power is transmitted from the asynchronous power source via the second transmission line, the transmitted DC power is converted into AC power by an inverter, and active power not including reactive power is supplied to the on-site load; a power supply method for supplying reactive power to the station load from the synchronous power source or the power system via the power line when the station load is short of reactive power;

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