CN103956766A - Distributed-power-supply connection measurement and control and protection all-in-one machine and method - Google Patents
Distributed-power-supply connection measurement and control and protection all-in-one machine and method Download PDFInfo
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Abstract
The invention provides a distributed-power-supply connection, measurement and control and protection all-in-one machine and method. The all-in-one machine includes a central controller which is used for controlling power generation quantity of a distributed power supply through use an anti-reflux control algorithm according to an energy parameter of a grid connection point so as to prevent redundant electricity of the distributed power supply from being returned to a power grid, also used for detecting happening of island according to the voltage and frequency parameters of the grid connection point and splitting the distributed power supply and the power grid in a regulated time after happening of the island, and also used for comparing electric energy quality data of a monitored grid connection point and a preset electric energy quality standard and controlling an electric energy quality unit to regulate an electric energy quality according to the comparison result so as to comply with the preset electric energy quality standard. The distributed-power-supply connection, measurement and control and protection all-in-one machine and method integrate and optimize island detection, anti-reflux control and electric energy quality control so as to form a control strategy of the all-in-one machine so that the control intelligent degree is improved and the construction cost of a system is reduced.
Description
Technical field
The present invention relates to distributed generation technology field, relate in particular to a kind of distributed power source access monitoring and protection all-in-one and distributed power source access monitoring and protection method.
Background technology
At present, along with large-scale distributed power supply access electrical network, stability and the fail safe of electrical network are greatly affected.This is because the various factorss such as the quality of power supply that the intermittence that distributed power source is exerted oneself, fluctuation and power electronic product produce all exert an influence to electrical network, particularly distributed power source energy output accounts for whole electrical network ratio when very high, while being distributed power source high permeability, the suffered impact of the safety of electrical network and stability is larger.Influence surface relates to voltage, frequency, power angle and dispatching of power netwoks etc.
In addition, existence due to distributed power source, the radioactive directed energy flow pattern of tradition no longer exists, the substitute is the two-way flow pattern of energy, this may cause the generation of isolated island phenomenon, so-called isolated island phenomenon refers to jumps while breaking because of failure accident or the maintenance that has a power failure when mains supply, the distributed power source of user side fails to detect in time island state, and then fail to cut off in time electricity network, the isolated island of the self-energizing that formation is comprised of distributed power source and load around, isolated island will damage power equipment and operations staff's personal safety, and affect power supply quality.
In addition, distributed power generation power supply is when with network grid-connected power, suggestion is generated power for their own use, grid company has not allowed reverse current to flow into electrical network conventionally, in relevant standard, stipulate: when detect reverse current surpass specified output 5% time, distributed power generation power supply should stop to power network line power transmission in 0.5～2s.Therefore need to take the measure of counterflow-preventing.
In the prior art, in order to realize, isolated island detects, counterflow-preventing is controlled and the quality of power supply is controlled, and needs three independently professional control appliances, this makes the automaticity of whole control system lower, control procedure is complicated, and failure rate is higher, and the maintenance cost in later stage is also higher; In addition because the kind of equipment is more, make the project cost of system high.
Summary of the invention
The object of the present invention is to provide a kind of distributed power source access monitoring and protection all-in-one and distributed power source access monitoring and protection method; isolated island detection, counterflow-preventing control and the quality of power supply are controlled and integrated and optimize; form the control strategy of all-in-one; improve the intelligent degree of controlling, reduced the cost of system.
One aspect of the present invention provides a kind of distributed power source access monitoring and protection all-in-one, and this all-in-one comprises:
Central controller, the energy parameter for basis site, utilizes counterflow-preventing control algolithm, the energy output of distributed power source is controlled, to prevent the anti-electrical network of sending back to of unnecessary electric weight of distributed power source; Also for according to and voltage and the frequency parameter of site, detect the generation of isolated island, and after isolated island occurs in official hour by described distributed power source and described grid disconnection; Also, for power quality data and the predefined quality of power supply standard monitoring and site are compared, by comparative result, control the quality of power supply unit quality of power supply is regulated, to meet predefined quality of power supply standard.
In a preferred embodiment, also comprise:
Electric energy quality monitoring unit, for monitoring the also power quality data of site;
Electrical network parameter collecting unit, for monitoring and the voltage of site and frequency parameter and and the energy parameter of site.
In a preferred embodiment, described central controller utilizes counterflow-preventing control algolithm, the energy output of distributed power source is controlled to specific implementation be: by control inverter, realize power output and smoothly control.
In a preferred embodiment, the generation specific implementation that the voltage of described central controller basis site and frequency parameter detect isolated island is: utilize inverter isolated island to detect the isolated island detection that protection mechanism is carried out grid side.
In a preferred embodiment, also comprise standby isolated island detection module, for carry out isolated island detection in the situation that described central controller detects isolated island disabler.
The present invention also provides on the other hand a kind of and accesses by distributed power source the method that monitoring and protection all-in-one is realized distributed power source access monitoring and protection, and described central controller comprises central controller, and the method comprises:
The energy parameter of described central controller basis site, utilizes counterflow-preventing control algolithm, the energy output of distributed power source is controlled, to prevent the anti-electrical network of sending back to of unnecessary electric weight of distributed power source;
Described central controller according to and voltage and the frequency parameter of site, detect the generation of isolated island, and after isolated island occurs in official hour by described distributed power generation power supply and described grid disconnection;
Described central controller compares power quality data and the predefined quality of power supply standard monitoring and site, controls the quality of power supply unit quality of power supply is regulated, to meet predefined quality of power supply standard by comparative result.
In a preferred embodiment, described distributed power source access monitoring and protection all-in-one also comprises electric energy quality monitoring unit and electrical network parameter collecting unit;
The method also comprises;
The power quality data of described electric energy quality monitoring unit monitors site;
The voltage of described electrical network parameter collecting unit monitoring site and frequency parameter and the also energy parameter of site.
In a preferred embodiment, described central controller utilizes counterflow-preventing control algolithm, the energy output of distributed power source is controlled to specific implementation be: by control inverter, realize power output and smoothly control.
In a preferred embodiment, the generation specific implementation that the voltage of described central controller basis site and frequency parameter detect isolated island is: utilize inverter isolated island to detect the isolated island detection that protection mechanism is carried out grid side.
In a preferred embodiment, the generation specific implementation that the voltage of described central controller basis site and frequency parameter detect isolated island is: utilize inverter isolated island to detect the isolated island detection that protection mechanism is carried out grid side.
Compared with prior art, the present invention has realized counterflow-preventing control, isolated island detection and the quality of power supply by integrated all-in-one and has controlled, and dexterously counterflow-preventing control technology is combined with isolated island detection technique, when carrying out counterflow-preventing control, dwindle isolated island and detect blind area, ensure the safety of electrical network, the all-in-one in the present invention has increased the relevance between counterflow-preventing control and isolated island detection thus, improve the intelligent degree of controlling, promoted the safety and stability of system; In addition the number of devices in the all-in-one in the present invention is less, effectively reduces the cost of system, and has reduced the maintenance cost of post facility, has promoted the earning rate in distributed power station.
Accompanying drawing explanation
Fig. 1 accesses the block diagram of monitoring and protection all-in-one for the embodiment of the present invention provides a kind of distributed power source;
Fig. 2 is for being applied to the schematic diagram in distributed generation system by a kind of distributed power source access monitoring and protection all-in-one of specific implementation;
A kind of distributed power source that Fig. 3 provides for the embodiment of the present invention accesses the flow chart of the method for monitoring and protection.
Embodiment
For making that object of the present invention, structure, feature and function thereof are had to further understanding, hereby coordinate embodiment to be described in detail as follows.
The embodiment of the present invention provides a kind of distributed power source access monitoring and protection all-in-one, and as shown in Figure 1, this all-in-one comprises central controller 101.This central controller 101, for the energy parameter of basis site, utilizes counterflow-preventing control algolithm, the energy output of distributed power source is controlled, to prevent the anti-electrical network of sending back to of unnecessary electric weight of distributed power source.In addition this central controller also for according to and voltage and the frequency parameter of site, detect the generation of isolated island, and after isolated island occurs in official hour by distributed power source and grid disconnection; Central controller, also for power quality data and the predefined quality of power supply standard monitoring and site are compared, is controlled quality of power supply unit by comparative result the quality of power supply is regulated, to meet predefined quality of power supply standard simultaneously.
The present invention has realized counterflow-preventing control, isolated island detection and the quality of power supply by integrated all-in-one and has controlled, and dexterously counterflow-preventing control technology is combined with isolated island detection technique, when carrying out counterflow-preventing control, dwindle isolated island and detect blind area, ensure the safety of electrical network, all-in-one in the present invention has increased the relevance between counterflow-preventing control and isolated island detection thus, has improved the intelligent degree of controlling, and has promoted the safety and stability of system; In addition the number of devices in the all-in-one in the present invention is less, effectively reduces the cost of system, and has reduced the maintenance cost of post facility, has promoted the earning rate in distributed power station.
In a preferred embodiment, in order to realize central controller, control the collection of the parameters of institute's foundation, in all-in-one, can also increase electric energy quality monitoring unit 102 and electrical network parameter collecting unit 103.Wherein, electric energy quality monitoring unit 102 is for monitoring and the power quality data of site, and electrical network parameter collecting unit 103 is for monitoring and voltage and the frequency parameter of site, and and the energy parameter of site.
Central controller 101, when utilizing counterflow-preventing control algolithm to control the energy output of distributed power source, can be realized by control inverter the level and smooth control of power output.And the control of traditional counterflow-preventing mostly is mechanical switching control, this mode causes reduce device lifetime, and system generating efficiency reduces; And change mechanical switching into control inverter power output, smoothly control, can reduce the wearing and tearing of device, improve the useful life of product.
When distributed power source adopts photovoltaic module, the DC side power of inverter derives from photovoltaic module, inverter is usually operated at the maximum power value place of photovoltaic module, when reducing or increasing the power output of inverter in order to realize the level and smooth control of inverter power output, output power value that can control inverter departs from the maximum power value place of above-mentioned photovoltaic module.
In embodiments of the present invention, the generation that the voltage of central controller 101 bases site and frequency parameter detect isolated island can specific implementation be: utilize inverter side isolated island to detect the isolated island detection that protection mechanism is carried out grid side.Can realize thus inverter side isolated island is detected to the isolated island testing mechanism that protection mechanism changes grid side into; by the control of counterflow-preventing; can dwindle the blind area that isolated island detects simultaneously; even in a plurality of inverter parallel situations; also generation that can fast detecting isolated island, and in official hour and grid disconnection.Here official hour can be with reference to the regulation of national standard or international standard.
In addition, in order to improve the Comprehensive Control ability of whole all-in-one, can also increase standby isolated island detection module in all-in-one, this standby isolated island detection module, in the situation that central controller 101 detects isolated island disabler, carries out isolated island detection.
Fig. 2 shows a kind of distributed power source access monitoring and protection all-in-one of specific implementation is applied to the schematic diagram in distributed generation system; as shown in Figure 2; distributed power generation central controller has realized the function of the central controller in above-described embodiment; this distributed power generation central controller is connected with the isolated island detection module as standby; also be connected with the also site electric energy quality monitoring equipment as electric energy quality monitoring unit, and site electric energy quality monitoring equipment obtains the power quality data that power quality parameter measuring unit gathers simultaneously.
Another embodiment of the present invention is also corresponding provides a kind of method of utilizing distributed power source in above-described embodiment access monitoring and protection all-in-one to realize distributed power source access monitoring and protection, and as shown in Figure 3, the method comprises the steps:
Step S301: the energy parameter of central controller basis site, utilize counterflow-preventing control algolithm, the energy output of distributed power source is controlled, to prevent the anti-electrical network of sending back to of unnecessary electric weight of distributed power source;
Step S302: central controller according to and voltage and the frequency parameter of site, detect the generation of isolated island, and after isolated island occurs in official hour by described distributed power generation power supply and described grid disconnection;
Step S303: central controller compares power quality data and the predefined quality of power supply standard monitoring and site, controls the quality of power supply unit quality of power supply is regulated, to meet predefined quality of power supply standard by comparative result.
The method of the distributed power source access monitoring and protection in the present invention has realized counterflow-preventing control, isolated island detects and the quality of power supply is controlled; and dexterously counterflow-preventing control technology is combined with isolated island detection technique; when carrying out counterflow-preventing control; dwindle isolated island and detect blind area; ensure the safety of electrical network; increase the relevance between counterflow-preventing control and isolated island detection, improved the intelligent degree of controlling, promoted the safety and stability of systems approach.
In addition, in practice, while increasing electric energy quality monitoring unit and electrical network parameter collecting unit in all-in-one, the method can also comprise: the power quality data of electric energy quality monitoring unit monitors site; The voltage of the monitoring of electrical network parameter collecting unit site and frequency parameter and the also energy parameter of site.
Central controller utilizes counterflow-preventing control algolithm, the energy output of distributed power source is controlled can specific implementation be: by control inverter, realize power output and smoothly control.And the control of traditional counterflow-preventing mostly is mechanical switching control, this mode causes reduce device lifetime, and system generating efficiency reduces; And change mechanical switching into control inverter power output, smoothly control, can reduce the wearing and tearing of device, improve the useful life of product.
The generation that the voltage of central controller basis site and frequency parameter detect isolated island can specific implementation be: utilize inverter isolated island to detect the isolated island detection that protection mechanism is carried out grid side.Can realize thus inverter side isolated island is detected to the isolated island testing mechanism that protection mechanism changes grid side into; by the control of counterflow-preventing; can dwindle the blind area that isolated island detects simultaneously; even in a plurality of inverter parallel situations; also generation that can fast detecting isolated island, and in official hour and grid disconnection.Here official hour can be with reference to the regulation of national standard or international standard.
In addition, in order to improve the comprehensive of the inventive method, in the method, can also comprise: by standby isolated island detection module, in the situation that described central controller detects isolated island disabler, carry out isolated island detection.
The present invention is described by above-mentioned related embodiment, yet above-described embodiment is only for implementing example of the present invention.Must be pointed out that, the embodiment having disclosed does not limit the scope of the invention.On the contrary, the change done without departing from the spirit and scope of the present invention and retouching, all belong to scope of patent protection of the present invention.
Claims (10)
1. a distributed power source access monitoring and protection all-in-one, is characterized in that, comprising:
Central controller, the energy parameter for basis site, utilizes counterflow-preventing control algolithm, the energy output of distributed power source is controlled, to prevent the anti-electrical network of sending back to of unnecessary electric weight of distributed power source; Also for according to and voltage and the frequency parameter of site, detect the generation of isolated island, and after isolated island occurs in official hour by described distributed power source and described grid disconnection; Also, for power quality data and the predefined quality of power supply standard monitoring and site are compared, by comparative result, control the quality of power supply unit quality of power supply is regulated, to meet predefined quality of power supply standard.
2. all-in-one as claimed in claim 1, is characterized in that, also comprises:
Electric energy quality monitoring unit, for monitoring the also power quality data of site;
Electrical network parameter collecting unit, for monitoring and the voltage of site and frequency parameter and and the energy parameter of site.
3. all-in-one as claimed in claim 1, is characterized in that, described central controller utilizes counterflow-preventing control algolithm, the energy output of distributed power source is controlled to specific implementation be: by control inverter, realize power output and smoothly control.
4. all-in-one as claimed in claim 1, is characterized in that, the generation specific implementation that the voltage of described central controller basis site and frequency parameter detect isolated island is: utilize inverter isolated island to detect the isolated island detection that protection mechanism is carried out grid side.
5. all-in-one as claimed in claim 4, is characterized in that, also comprises standby isolated island detection module, for carry out isolated island detection in the situation that described central controller detects isolated island disabler.
6. by distributed power source, access the method that monitoring and protection all-in-one is realized distributed power source access monitoring and protection, it is characterized in that, described central controller comprises central controller, and the method comprises:
The energy parameter of described central controller basis site, utilizes counterflow-preventing control algolithm, the energy output of distributed power source is controlled, to prevent the anti-electrical network of sending back to of unnecessary electric weight of distributed power source;
Described central controller according to and voltage and the frequency parameter of site, detect the generation of isolated island, and after isolated island occurs in official hour by described distributed power generation power supply and described grid disconnection;
Described central controller compares power quality data and the predefined quality of power supply standard monitoring and site, controls the quality of power supply unit quality of power supply is regulated, to meet predefined quality of power supply standard by comparative result.
7. method as claimed in claim 6, is characterized in that, described distributed power source access monitoring and protection all-in-one also comprises electric energy quality monitoring unit and electrical network parameter collecting unit;
The method also comprises;
The power quality data of described electric energy quality monitoring unit monitors site;
The voltage of described electrical network parameter collecting unit monitoring site and frequency parameter and the also energy parameter of site.
8. method as claimed in claim 6, is characterized in that, described central controller utilizes counterflow-preventing control algolithm, the energy output of distributed power source is controlled to specific implementation be: by control inverter, realize power output and smoothly control.
9. method as claimed in claim 6, is characterized in that, the generation specific implementation that the voltage of described central controller basis site and frequency parameter detect isolated island is: utilize inverter isolated island to detect the isolated island detection that protection mechanism is carried out grid side.
10. method as claimed in claim 9, is characterized in that, described distributed power source access monitoring and protection all-in-one also comprises standby isolated island detection module; The method also comprises: standby isolated island detection module carries out isolated island detection in the situation that described central controller detects isolated island disabler.
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Cited By (2)
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| CN105529737A (en) * | 2015-12-29 | 2016-04-27 | 深圳市锦祥自动化设备有限公司 | Power network splitting device and method |
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Application publication date: 20140730 |