CN103178553B - A kind of family expenses mixed power supply system - Google Patents
A kind of family expenses mixed power supply system Download PDFInfo
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- CN103178553B CN103178553B CN201310074368.8A CN201310074368A CN103178553B CN 103178553 B CN103178553 B CN 103178553B CN 201310074368 A CN201310074368 A CN 201310074368A CN 103178553 B CN103178553 B CN 103178553B
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Abstract
The invention discloses a kind of family expenses mixed power supply system, comprise DC/DC converter, two-way AC/DC converter, one-level DC bus, secondary DC bus, ac bus, automatic switching control equipment (1), batteries, wherein automatic switching control equipment (1) can arrange different powering modes according to different power utilization environments, control energy flow between each module to; Ac bus is divided into two-way, connects uninterrupted power supply load and can interruptedly supplying power load respectively; Batteries is connected with secondary DC bus, the electric energy that solar energy or wind power generation export transforms by the present invention, realize grid-connected function, for electrical network provides dynamic or static support and reactive power compensation, slow down the sudden change of grid power and the impact to electrical network, the present invention can realize electric energy and generate power for their own use, and optimizes energy resource supply mode, be the Main Patterns that following family expenses are powered, reach the clean energy resource supply of 24 hours and grid loss minimizes, the effect of client's maximum revenue.
Description
Technical field
The present invention relates to a kind of family expenses mixed power supply system, belong to the technical field of power system power supply.
Background technology
In recent years, the impact of energy shortage on social development becomes increasingly conspicuous, distributed generation system based on regenerative resource obtains the attention of many countries, photovoltaic DC-to-AC converter is as the fresh combatants of regenerative resource, all give certain subsidy to encourage the installation of photovoltaic combining inverter both at home and abroad, but photovoltaic generation has unsteadiness, the inherent shortcomings such as discontinuity, the grid-connected stable operation threatening public electric wire net even gradually on a large scale, current many countries put into effect regulation on the one hand, the access of restriction photovoltaic combining inverter, progressively lower online subsidy on the other hand, reduce the income of combining inverter, along with socioeconomic sustainable development, the demand of electric power system is increasing, therefore, a kind of energy-conserving and environment-protective are provided, electric power system is current problem demanding prompt solution safely and efficiently.
Summary of the invention
Technical problem to be solved by this invention is:
For the shortcoming and defect in background technology, the invention provides a kind of family expenses mixed power supply system, the electric energy that solar energy or wind power generation export is transformed, directly supply DC load is applied and is stored in storage battery for subsequent use on the one hand, on the other hand by unnecessary energy feedback to electrical network, for electrical network provides dynamic or static support and reactive power compensation, slow down the sudden change of grid power and the impact to electrical network; Increase automatic switching control equipment simultaneously, make different power utilization environments that different powering modes is set, optimize energy resource supply mode, for crucial DC load and AC load provide uninterrupted power supply.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of family expenses mixed power supply system, it is characterized in that: comprise DC/DC converter, two-way AC/DC converter, one-level DC bus, secondary DC bus, ac bus, automatic switching control equipment, batteries, wherein DC/DC converter comprises unidirectional DC/DC converter and two-way DC/DC converter; Wherein unidirectional DC/DC converter is connected with outside photovoltaic power generation apparatus, and two-way AC/DC converter is connected with electrical network;
Described automatic switching control equipment for control energy flow between each module to,
(1) when electrical network is normal, when the output energy of photovoltaic power generation apparatus is sufficient, automatic switching control equipment is set to the preferential grid-connect mode of photovoltaic power generation apparatus or is preferably battery charging pattern, wherein when being set to preferential grid-connect mode, the electric energy that photovoltaic power generation apparatus exports flows into one-level DC bus after unidirectional DC/DC converter conversion, then after two-way AC/DC converter conversion, feeding back to electrical network, is that ac bus is powered by electrical network; When being set to be preferably battery charging pattern, the electric energy that photovoltaic power generation apparatus exports flows into one-level DC bus after unidirectional DC/DC converter conversion, then after two-way DC/DC converter conversion, flow into secondary DC bus, be battery charging, power to DC load simultaneously;
(2) when the energy shortage that photovoltaic power generation apparatus exports, when batteries is under-voltage, automatic switching control equipment is set to grid charging pattern, the power supply of ac bus is maintained by electrical network, power grid energy is transformed to one-level DC bus energy through two-way AC/DC converter simultaneously, then be transformed to secondary DC bus energy through two-way DC/DC converter, accumulators group is charged;
(3) when electrical network is abnormal, automatic switching control equipment is set to from net pattern, automatically cuts off the connection of family expenses mixed power supply system and electrical network, and disconnection simultaneously can the power supply of interruptedly supplying power load,
When the output energy of photovoltaic power generation apparatus is greater than load institute energy requirement, the power supply of DC load and uninterrupted power supply load is maintained by photovoltaic power generation apparatus, the output of photovoltaic power generation apparatus flows into one-level DC bus after unidirectional DC/DC converter conversion, then after two-way AC/DC converter conversion, maintain the power supply of uninterrupted power supply load, the energy of one-level DC bus flows into secondary DC bus after two-way DC/DC converter conversion, for battery charging, power to DC load simultaneously;
When the output energy of photovoltaic power generation apparatus is less than load institute energy requirement, DC load and uninterrupted power supply load supplying is given together with batteries by photovoltaic power generation apparatus, batteries directly provides the energy of secondary DC bus, for DC load is powered, realized the bi-directional conversion of energy between one-level DC bus and secondary DC bus by two-way DC/DC converter, one-level DC bus energy is rear by two-way AC/DC converter conversion is uninterrupted power supply load supplying;
(4), when power system restoration is normal, automatic switching control equipment automatic switchover family expenses mixed power supply system transfers grid-connect mode work to from from net pattern.
Described automatic switching control equipment comprises sensor assembly, DSP or single chip control module, wherein sensor assembly detects that current and voltage signals is transferred to DSP or one-chip computer module, export control signal after DSP or one-chip computer module judge process to detection signal, realize the automatic switchover of powering mode.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
(1) by increasing two-way DC/DC circuit and secondary DC bus, be directly used in DC load after the electric energy of device of solar generating can being changed, also can by power storage in storage battery, DC load can be realized and uninterrupted power supply load is using under net state.
(2) add automatic switching control equipment, realize optimum energy resource supply mode, user can charge the battery in the low power consumption period, and the peak of power consumption period uses battery supply load, significantly reduces electric cost; Simultaneously during peak of power consumption by electric energy feed to electrical network, for electrical network provides dynamic or static support and reactive power compensation, slow down the sudden change of grid power and the impact to electrical network; The loss realizing electrical network minimizes and client's maximum revenue.
(3) two-way AC/DC converter realizes solar power generation grid-connecting function on the one hand, and another aspect is charge in batteries by electrical network, realizes the uninterrupted power supply of DC load and AC load.
Accompanying drawing explanation
Fig. 1 is that present system forms block diagram.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
The invention provides a kind of family expenses mixed power supply system, as shown in Figure 1, comprise DC/DC converter, AC/DC converter, one-level DC bus, secondary DC bus, ac bus, automatic switching control equipment, described DC/DC converter comprises the first unidirectional DC/DC1 converter and two-way DC/DC2 converter, and automatic switching control equipment is connected with one-level DC bus, the first unidirectional DC/DC1 converter, two-way AC/DC1 converter, uninterrupted power supply load; Two-way DC/DC2 converter is connected between one-level DC bus and secondary DC bus; Two-way AC/DC1 converter is connected with ac bus by electrical network, and ac bus is divided into two-way, respectively with uninterrupted power supply load and can interruptedly supplying power load being connected.
First unidirectional DC/DC1 converter is used for solar energy to be converted to one-level DC bus-bar voltage, two-way DC/DC2 converter is changed for the bidirectional energy realizing one-level DC bus and secondary DC bus, two-way AC/DC1 converter is changed for the bidirectional energy realizing electrical network and one-level DC bus and is uninterrupted power supply load supplying, automatic switching control equipment can according to electricity consumption situation automatic switchover powering mode, secondary DC bus and batteries and DC load are as display, server, the equipment such as LED are connected, for powering for DC load and being battery charging, , ac bus is divided into two-way, respectively with uninterrupted power supply load and can interruptedly supplying power load being connected, wherein uninterrupted power supply load comprises computer, watch-dog, Medical Devices, warning device etc., interruptedly supplying power load can comprise the domestic electric appliances such as domestic air conditioning, water pump, TV.
The present system course of work is as follows:
A, when electrical network normal, when solar energy or wind energy supply abundance, under family expenses mixed power supply system is operated in grid-connect mode, solar energy flows into one-level DC bus through the first unidirectional DC/DC1 converter, then secondary is flowed into through two-way DC/DC2 converter DC bus powered, realize the power supply of DC load, accumulators group charging simultaneously; Unnecessary solar energy feeds back to electrical network through two-way AC/DC1 converter, and ac bus is by mains supply.User can arrange automatic switching control equipment change energy flow to, be set to the preferential grid-connect mode of solar energy, the output voltage of photovoltaic power generation apparatus is by feeding back to electrical network, for ac bus is powered after the first unidirectional DC/DC1 converter, one-level DC bus, the conversion of two-way AC/DC1 converter; Be set to solar energy preferential accumulators group charge mode, the output voltage of photovoltaic power generation apparatus is by outputting to secondary DC bus after the first unidirectional DC/DC1 converter, one-level DC bus, the conversion of two-way DC/DC2 converter, for battery charging, power to DC load such as the equipment such as display, server, LED simultaneously; When being set to batteries discharge mode, family expenses mixed power supply system will automatically switch to batteries discharge mode, by batteries to DC load as the equipment such as display, server, LED are powered;
When solar energy or wind energy undersupply, when causing batteries under-voltage, family expenses mixed power supply system will proceed to grid charging pattern, the power supply of ac bus is maintained by electrical network, simultaneously through two-way AC/DC1 converter and the charging of two-way DC/DC2 converter accumulators group, avoid under-voltagely affecting battery life for a long time.
B, when electrical network is abnormal, family expenses mixed power supply system transfers to from net work pattern, automatically cuts off the connection with electrical network, and disconnect can the power supply of interruptedly supplying power load simultaneously, two-way AC/DC1 converter obtains energy from one-level DC bus, maintains the power supply of uninterrupted power supply load.When solar power is greater than bearing power, maintained the power supply of DC load and uninterrupted power supply load by solar energy, accumulators group charging simultaneously.When solar power is less than load, give DC load and uninterrupted power supply load supplying by solar energy together with batteries; When power system restoration is normal, family expenses mixed power supply system will transfer grid-connect mode work to from from net pattern automatically.
Family expenses mixed power supply system of the present invention, available wind generating is that one-level is DC bus powered by unidirectional AC/DC2 converter, and one-level DC bus is the equipment charges such as electric automobile by the second unidirectional DC/DC3 converter, and user can arrange different powering modes.
The control of automatic switching control equipment of the present invention can be selected to detect that the signals such as electric current and voltage send DSP or single-chip microcomputer to by transducer, after single-chip microcomputer judges detection signal process, sends control command and realizes automatic switchover powering mode.
Claims (2)
1. a family expenses mixed power supply system, it is characterized in that: comprise DC/DC converter, two-way AC/DC converter, one-level DC bus, secondary DC bus, ac bus, automatic switching control equipment (1), batteries, wherein DC/DC converter comprises unidirectional DC/DC converter and two-way DC/DC converter; Wherein unidirectional DC/DC converter is connected with outside photovoltaic power generation apparatus, and two-way AC/DC converter is connected with electrical network;
Described automatic switching control equipment (1) for control energy flow between each module to,
(1) when electrical network is normal, when the output energy of photovoltaic power generation apparatus is sufficient, automatic switching control equipment (1) is set to the preferential grid-connect mode of photovoltaic power generation apparatus or is preferably battery charging pattern, wherein when being set to preferential grid-connect mode, the electric energy that photovoltaic power generation apparatus exports flows into one-level DC bus after unidirectional DC/DC converter conversion, then after two-way AC/DC converter conversion, feeding back to electrical network, is that ac bus is powered by electrical network; When being set to be preferably battery charging pattern, the electric energy that photovoltaic power generation apparatus exports flows into one-level DC bus after unidirectional DC/DC converter conversion, then after two-way DC/DC converter conversion, flow into secondary DC bus, be battery charging, power to DC load simultaneously;
(2) when the energy shortage that photovoltaic power generation apparatus exports, when batteries is under-voltage, automatic switching control equipment (1) is set to grid charging pattern, the power supply of ac bus is maintained by electrical network, power grid energy is transformed to one-level DC bus energy through two-way AC/DC converter simultaneously, then be transformed to secondary DC bus energy through two-way DC/DC converter, accumulators group is charged;
(3) when electrical network is abnormal, automatic switching control equipment (1) is set to from net pattern, automatically cuts off the connection of family expenses mixed power supply system and electrical network, and disconnection simultaneously can the power supply of interruptedly supplying power load,
When the output energy of photovoltaic power generation apparatus is greater than load institute energy requirement, the power supply of DC load and uninterrupted power supply load is maintained by photovoltaic power generation apparatus, the output of photovoltaic power generation apparatus flows into one-level DC bus after unidirectional DC/DC converter conversion, then after two-way AC/DC converter conversion, maintain the power supply of uninterrupted power supply load, the energy of one-level DC bus flows into secondary DC bus after two-way DC/DC converter conversion, for battery charging, power to DC load simultaneously;
When the output energy of photovoltaic power generation apparatus is less than load institute energy requirement, DC load and uninterrupted power supply load supplying is given together with batteries by photovoltaic power generation apparatus, batteries directly provides the energy of secondary DC bus, for DC load is powered, realized the bi-directional conversion of energy between one-level DC bus and secondary DC bus by two-way DC/DC converter, one-level DC bus energy is rear by two-way AC/DC converter conversion is uninterrupted power supply load supplying;
(4), when power system restoration is normal, automatic switching control equipment (1) automatic switchover family expenses mixed power supply system transfers grid-connect mode work to from from net pattern.
2. a kind of family expenses mixed power supply system according to claim 1, it is characterized in that: described automatic switching control equipment (1) comprises sensor assembly, DSP or single chip control module, wherein sensor assembly detects that current and voltage signals is transferred to DSP or one-chip computer module, export control signal after DSP or one-chip computer module judge process to detection signal, realize the automatic switchover of powering mode.
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| CN201310074368.8A CN103178553B (en) | 2013-03-08 | 2013-03-08 | A kind of family expenses mixed power supply system |
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| CN201310074368.8A CN103178553B (en) | 2013-03-08 | 2013-03-08 | A kind of family expenses mixed power supply system |
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| CN103178553A CN103178553A (en) | 2013-06-26 |
| CN103178553B true CN103178553B (en) | 2015-10-28 |
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